(csa.lib.tsinghua.edu.cn)
Tue Oct 11 16:48:55 CST 2005
CSA
Database: METADEX
Query: nano materials
Record 1 of 64
DN: Database Name
Recent References Related to Technology
TI: Title
Smart (Nano) materials: TiO2 nanostructured films to modify electrodes
for assembling of new electrochemical probes
SO: Source
Sensors and Actuators B, vol. 111-112, pp. 441-449, 11 Nov. 2005
DE: Descriptors
Nanostructure; Titanium dioxide; Nanocomposites; Electrodes;
Nanomaterials; Generation; Chemical sensors; Actuators; Biosensors;
Surface area; Optical; Nanostructured materials; Ascorbic acid;
Functions; Stables; Guanines; Electron transfer; Oxides; Assembling;
Sensors
AB: Abstract
Smart (Nano) materials with biosensing functions posses enormous
potential in the development of new generation stable biosensors,
chemical sensors, and actuators. Recently, there is a considerable
interest in using TiO2 nanostructured materials as a film-forming
material since they have high surface area, optical transparency, high
bio-compatibility, and relatively good conductivity. In this work,
TiO2 oxides were used as nanoporous electrodes to study the electron
transfer mechanisms of H2O2, and many interesting biological
molecules, as 3,4-dihydroxyphenylacetic acid (DOPAC), ascorbic acid,
guanine, l-tyrosine, acetaminophen, and D*b-NADH, in order to assemble
a new generation of chemical sensors and biosensors. A kinetic study
was also reported in this paper, which demonstrated high performances
towards electrocatalytic processes, obtained at nanostructured
TiO2-modified electrodes.
Record 2 of 64
DN: Database Name
Recent References Related to Technology
TI: Title
Measurement of Continuous Micro-Tensile Strain Using Micro-ESPI
Technique
SO: Source
Key Engineering Materials, vol. 297-300, pp. 53-58, Nov. 2005
DE: Descriptors
Microelectromechanical systems; Algorithms; Nanostructure; Silicon
substrates; Thin films; Stress strain curves; Strain measurement;
Titanium nitride; Mathematical models; Gold
AB: Abstract
To determine the micro-mechanical properties for micro/nano materials,
it may be essential to measure the strain/deformation during
micro-mechanical testing. Therefore, in this study, continuous
measurement of in-plane tensile strain in micro-sized specimens of
thin film materials was introduced using the micro-ESPI technique. TiN
and Au thin films 1 and 0.47mm thick, respectively, were deposited on
the silicon wafer and fabricated into the micro-sized tensile
specimens by the electromachining process. The micro-tensile loading
system and micro-ESPI system were developed to measure the tensile
strain during micro-tensile loading. Micro-tensile stress-strain
curves for these materials were determined using the algorithm for
continuous strain measurement. Furthermore, the new algorithm for
enhancing the sensitivity to measurement of in-plane tensile strain
was suggested. Using the algorithm, micro-tensile strain data between
interfringes were calculated. It is shown that the algorithm for
enhancement of the sensitivity suggested in this study makes the
sensitivity to the in-plane tensile strain increase. (Application:
microelectromechanical systems.)
Record 3 of 64
DN: Database Name
Recent References Related to Technology
TI: Title
Repairing Surface Defects of Steel 304 with Nano-Silica
SO: Source
Huadong Ligong Daxue Xuebao (Ziran Kexue Ban)/Journal of East China
University of Science and Technology (Natural Science Edition), vol.
31, pp. 253-255, Apr. 2005
DE: Descriptors
Austenitic stainless steels; Repairing; Surface defects;
Nanomaterials; Tensile properties; Fluidizing; Selectivity;
Morphology; Silicon dioxide
AB: Abstract
A new method for repairing surface defects with nano-materials was
suggested. Reparing surface defects of steel 304 with nano-silicas was
studied. The effects of the process conditions of repairing with
fluidizing nano-silicas on the surface morphology (the selectivity of
repair) and tensile properties of test steel pieces were investigated.
The facts show that nano-materials can repair surface defects
selectively. A new technique for repairing surface defects may be
developed.
Record 4 of 64
DN: Database Name
Recent References Related to Technology
TI: Title
Improvement of preservation of iron relics with polyurethane emulsion
by adding assistant
SO: Source
Journal of Beijing University of Chemical Technology (Natural Science
Edition), vol. 32, pp. 47-49, 54, Apr. 2005
DE: Descriptors
Protective coatings; Iron; Polyurethane resins; Emulsions; Inhibition;
Corrosion resistance; Titanium dioxide; Corrosion inhibitors; Silicon
dioxide; Preservation; Ultraviolet radiation
AB: Abstract
A new composite protective technique for iron relics was made up of
bottom and top coats. Polyurethane emulsion added corrosion inhibitors
was used as the bottom coat and the nanoparticles of TiO2 and SiO2
were dispersed in the polyurethane emulsion to form the top coat. The
properties were assessed by Transmission Electron Microscope (TEM),
Scanning Electron Microscope (SEM) and Ultraviolet Spectroscopy, etc.
The results show that the bottom coat by adding corrosion inhibitors
and the top coat by adding nano-materials have excellent ultraviolet
resistance and corrosion resistance and result in a good protection of
iron relics.
Record 5 of 64
DN: Database Name
METADEX
TI: Title
Crystal structure transformation and luminescent behavior of the red
phosphor for plasma display panels
AU: Author
Yu, Zhijian; Huang, Xiaowei; Zhuang, Weidong; Cui, Xiangzhong; Li,
Hongwei
SO: Source
Journal of Alloys and Compounds. Vol. 390, no. 1-2, pp. 220-222. 22
Mar. 2005
DE: Descriptors
Phosphors; Crystal structure; Transition; X ray diffraction; Oxides
AB: Abstract
To improve the chroma of red phosphor for plasma display panels, Eu3+
activated phosphors were prepared by combustion method, and were
investigated in detail by XRD and PL spectra. With the decreasing of
the amount of H3BO3, the phosphor crystal structures transform from
hexagonal ortho-borate to monoclinic RE3BO6, and then to cubic oxide.
The dominating emissions of the phosphors also change from 5D0-7F1
transition to 5D07F1 transition. Accordingly, CIE coordinates of the
phosphors show that x values are increasing while y values are
decreasing. Thus, phosphor with higher color purity could be achieved
by adjusting the mole ratio of H3BO3.
Record 6 of 64
DN: Database Name
METADEX
TI: Title
Mineralization By The Peptide Aptamer Against Ti
AU: Author
Sano, Ken-Ichi; Sasaki, Hiroyuki; Shiba, Kiyotaka
SO: Source
Polymer Preprints. Vol. 46, no. 1. Mar. 2005
DE: Descriptors
Peptides; Titanium; Surface properties; Interface reactions;
Bioengineering
AB: Abstract
Controlled interfacing between bio-molecules and inorganic materials
is fundamental to the development of bio-nano materials. In the past
several years, peptide aptamers that bind to various inorganic
materials have been isolated by using evolutional engineering methods
including peptide phage system. However, little is know about the
molecular mechanisms how they interact with the surface of materials.
We have isolated a peptide aptamer, TBP-1. The mutational analyses
revealed that the electrostatic interaction is the major force to
associate TBP-I with the surface of Ti.
Record 7 of 64
DN: Database Name
METADEX
TI: Title
Selective growth and characterization of nanostructures with
transmission electron microscopes
AU: Author
Shimojo, M; Bysakha, S; Mitsuishi, K; Tanaka, M; Song, M; Furuya, K
SO: Source
Applied Surface Science. Vol. 241, no. 1-2, pp. 56-60. 28 Feb. 2005
DE: Descriptors
Silicon; Carbon; Rods; Gold; Aluminum; Electron beams; Catalysis;
Electron microscopes; Chambers; Nanostructure; Nanocomposites;
Nanomaterials
AB: Abstract
A new type of electron beam-induced reactions is reported. Focused
electron beams, the probe size of which is about 0.8 nm, were
irradiated on carbon and Si substrates with an introduction of an
aluminum trichloride or a gold trichloride gas in the chamber.
Nanometer-sized carbon and Si rods were formed using carbon and Si
substrates, respectively, by moving the beam position at a certain
speed. As no aluminum, gold or chlorine was found in the rods, it is
considered that chloride gases behaved as a sort of catalysis.
Record 8 of 64
DN: Database Name
METADEX
TI: Title
Synthesis of Cu-based Bulk Metallic Glass Matrix Composites by Warm
Processing of Gas Atomized Powders
AU: Author
Lee, J K; Kim, H J; Yamasak, M; Kawamura, Y; Bae, J C
SO: Source
Materials Science Forum. Vol. 475-479, Part 5, pp. 3419-3422. 2005
DE: Descriptors
Metallic glasses; Copper base alloys; Brasses; Ductility; Porosity;
Compressive strength; Plastic deformation; Crystallization; Powder
metallurgy; Strain; Atomizing; Particulate composites; Spark plasma
sintering; COPPER GLASS ALLOYS; NICKEL ALLOYS (0 TO 50 NI); ZIRCONIUM
ALLOYS (0 TO 0.5 ZR); ZIRCONIUM ALLOYS (0.5 TO 50 ZR); TITANIUM ALLOYS
(0 TO 50 TI); BRASSES
AB: Abstract
The bulk metallic glass matrix composite comprising Cu54Ni6Zr22Ti18
metallic glass powder and ductile brass powder was fabricated by the
warm process. The warm process was carried out by spark plasma
sintering, which led to the homogeneous distribution of both phases of
brass and metallic glass without pores. The metallic glass matrix
composite material exhibits the same crystallization behavior of the
metallic glass powder. A compressive strength of 1.0 GPa with a
plastic strain of 3 % was obtained in the present metallic glass
composite. The composite with enhanced strength and ductility was
successfully achieved by introducing a ductile phase in the hard bulk
metallic glass.
Record 9 of 64
DN: Database Name
METADEX
TI: Title
Grain Refinement and Mechanical Properties of a Metastable Austenitic
Fe-Cr-Ni-Mn Alloy
AU: Author
Ma, Yunqing; Jin, Jae-Eun; Lee, Young-Kook
SO: Source
Materials Science Forum. Vol. 475-479, Part 1, pp. 43-48. 2005
DE: Descriptors
Thermomechanical treatment; Annealing; Cold rolling; Hot rolling;
Austenitic stainless steels; Martensitic transformations; High
strength; Grain size; Nanostructure; Austenite; Work hardening; Yield
strength; Alloy development; Grain refinement; Tensile tests
AB: Abstract
A lot of works for developing the structural nano-materials have been
performed all over the world in recent years. Severe deformation
techniques like HPT, ECPA and ARB have been applied to different
materials such as Al, Cu, Ti and several steels. Such techniques
greatly reduced the grain size and improved the yield and tensile
strengths. However, the elongation of the materials is greatly
decreased due to the small amount of work hardening, and these
techniques do not seem suitable for the mass production. Therefore,
this study has been carried out as a fundamental research for
developing austenitic steels with high strength and good elongation
using a conventional rolling and annealing processes.
Fe-0.1%C-10%Cr-5%Ni-8%Mn alloy was melted, homogenized, hot rolled,
and cold rolled at room temperature to transform gamma austenite to
alpha' martensite. After that, the specimens were annealed just above
its reverse transformation finish temperature (Af) to obtain the fine
reversed austenite grains. The grain size of the metastable austenitic
steel was successfully refined to less than 200nm by repeating rolling
and annealing processes. The resultant nanocrystalline material shows
not only high strength but also large elongation because the work
hardening ability is enhanced by the strain-induced martensitic
transformation during the tensile test.
Record 10 of 64
DN: Database Name
Recent References Related to Technology
TI: Title
Effect of Ammoniating Temperature of ZnO/Ga2O3 Films on Fabrication of
GaN Nanosize Materials on Si Substrates
SO: Source
Xiyou Jinshu Cailiao yu Gongcheng (Rare Metal Materials and
Engineering), vol. 34, pp. 73-76, Jan. 2005
DE: Descriptors
Gallium nitrides; Silicon substrates; Nanostructure; Wurtzite; Crystal
structure; Morphology; Magnetron sputtering; Zinc oxide; Gallium
oxides; Semiconductors
AB: Abstract
Hexagonal wurtzite GaN materials with nano-structure have been
fabricated on Si (111) substrates via ammoniating ZnO/Ga2O3 films at
different temperatures. ZnO layers and Ga2O3 films were deposited in
turn on Si (111) substrates by radio frequency (r.f.) magnetron
sputtering before the ammoniating process. The structure and
composition of GaN crystal were studied by X-ray diffraction (XRD) and
fourier transform infrared spectrophotometer(FTIR).The morphology of
the samples was studied by scanning electron microscopy (SEM). Through
the analyses of the measurement results, a conclusion can be drawn
that hexagonal wurtzite GaN with nano structure was grown on Si (111)
substrates with the assistance of the volatilization of ZnO, and the
ammoniating temperature has a great effect on the fabrication of GaN
nano materials with this method.
Record 11 of 64
DN: Database Name
Recent References Related to Technology
TI: Title
Mo6S4.5I4.5 nanowires: dispersion studies and electron microscopy
characterization of the bundles
SO: Source
Proc. SPIE, vol. SPIE-5824, pp. 102-113
DE: Descriptors
Nanowires; Nanostructure; Three phase; X-ray photoelectron
spectroscopy; Raw materials; Experiments; Nanotubes; Electron
microscopy; Purification; Nanocomposites; Theories; Isopropanol;
Nanomaterials
AB: Abstract
The processing of most one-dimensional nano-materials such as carbonnanotubes is hampered by the fact that they are insoluble. Here we
show how a significant portion of the as-produced Mo6S4.5I4.5
nanowires is stably dispersed in isopropanol as small diameter
nanowire bundles. Sedimentation studies, performed combining
experiments and theory, show the presence of three phases in the raw
material: impurity material, insoluble and soluble nanowire bundles. A
purification procedure is also discussed. The three phases has been
characterized by UV-Vix-IR spectroscopy and XPS showing their
intrinsic diversity.
Record 12 of 64
DN: Database Name
METADEX
TI: Title
Diameter-Controlled Growth of Carbon Nanotubes Through Pyrolysis of
Acetylene Using Rare Earth Alloy as Catalyst in Hydrogen
AU: Author
Zhu, Yanjuan; Chen, Yulian; Chen, Jian; Lin, Tianjin; Zhang, Chunhua;
Liu, Qiuxiang; Zhang, Haiyan
SO: Source
Journal of Rare Earths (English Edition). Vol. 22, no. 6, pp. 859-863.
Dec. 2004
DE: Descriptors
Carbon nanotubes; Synthesis; Catalysts; Rare earth alloys; Precursors;
Pyrolysis; Process parameters
AB: Abstract
High-purity carbon nanotubes (CNTs) were synthesized in hydrogen
ambience by CVD method by using rare earth alloy MlM5-1.35(CoAlMn)1.35
as catalyst, acetylene as carbon source. The influence of hydrogen
flow rate on the diameter, shape, purity, graphitization degree and
output of carbon nanotubes was systematically studied by scanning
selectronic microscopy ( SEM) , transmission electron microscopy (TEM)
, X-ray diffraction( XRD) and Raman technique. The results indicate
that the size of M1M alloy particles changed from p m order into nm
order during the process of hydrogen reduction. While no introducing
hydrogen in the reaction of acetylene and catalyst, CNTs can also be
synthesized on the catalyst. The CNTs are short and thick with average
diameter of about 97. 8 nm, and the wall of CNTs is also thick and
rough. With increasing of hydrogen flow rate, the diameter of CNTs
first decrease and then increase, while the output, purity, and
graphitization degree first increase and then decrease. The optimized
conditions are: CNTs reach its narrowest size with diameter of 49.1 nm
when hydrogen flow rate is 50 ml min-1. The purity. graphitization
degree, and output of CNTs reach highest and largest when hydrogren
flow rate is 75 ml min-1. It has the most uniform tube size of 97. 38
nm when hydrogen flow rate is 100 ml min-1.
Record 13 of 64
DN: Database Name
METADEX
TI: Title
A COMPOSITE PROTECTIVE AGENT FOR IRON RELICS PART II
AU: Author
Xu, Chun-Chun; Yu, Kai; Li, Zi-Feng
SO: Source
Corrosion Science and Protection Technology. Vol. 16, no. 6, pp.
408-410. Nov. 2004
DE: Descriptors
Iron; Protective coatings; Nanostructure; Corrosion prevention;
Shields; Corrosion inhibitors
AB: Abstract
An efficient composite protective agent for iron relics was studied
and its main performances were tested according to the requirement for
the conservation of iron cultural relics in this paper. Nano-materials
were dispersed in the pure acrylic emulsion to form nano-composites.
Nano-composites are used as top-coat and pure acrylic emulsion with
corrosion inhibitors is used as base coat for the conservation of iron
cultural relics. It is found that the composite protective coatings
performed well in many aspects, such as ultraviolet shield and
resistance to pollution etc. The composite protective agent is
promising for the conservation of iron cultural relics.
Record 14 of 64
DN: Database Name
METADEX
TI: Title
A COMPOSITE PROTECTIVE AGENT FOR IRON RELICS PART I
AU: Author
Xu, Chun-Chun; Yu, Kai; Li, Zi-Feng
SO: Source
Corrosion Science and Protection Technology. Vol. 16, no. 6, pp.
406-407. Nov. 2004
DE: Descriptors
Iron; Corrosion inhibitors; Corrosion prevention; Electron
microscopes; Immersion tests (corrosion)
AB: Abstract
Iron objects are easily oxidized and eroded, an efficient composite
protective agent for iron relics is studied in this paper.
Nano-materials were dispersed in water by adding dispersing agents,
the excellent dispersing agents were selected by subsiding method, the
dispersive state was tested by transmission electron microscope.
Several inhibitors were evaluated for iron in water by immersion test,
the result manifested that the composite corrosion inhibitor embodied
excellent function of anti-corrosion for iron in water and in 3.5 %
NaCl solution.
Record 15 of 64
DN: Database Name
Recent References Related to Technology
TI: Title
Development of AC magnetic heating setup for cancer therapy with
magnetic fluid hyperthermia
SO: Source
Dongnan Daxue Xuebao/Journal of Southeast University (Natural Science
Edition), vol. 34, pp. 794-796, Nov. 2004
DE: Descriptors
Magnetic fields; Alternating current; Setups; Cancer; Fluids;
Hyperthermia; Fluid dynamics; Heating; Fluid flow; Therapy;
Efficiency; Winding; Excitation; Topology; Conversion; Circuits;
Variability; Nanostructure; Magnetic pole; Wire bridge circuits
AB: Abstract
The setup produces an AC (alternating current) magnetic field at the
gap between the magnetic poles. Ferrite core in excitation winding
enhances the magnetic field intensity, and bridge topology in circuit
achieves high efficiency of power conversion. The frequency and
magnetic field intensity are 25 - 120 kHz and 6 - 16 kA/m,
respectively. Intensity measurement shows the uniformity of the
magnetic field. The temperature increment of the magnetic
nano-materials can be up to 28(degree)C with magnetic heating under
room temperature. The results suggest a way for clinical application
in the magnetic fluid hyperthermia (MFH) cancer therapy.
Record 16 of 64
DN: Database Name
METADEX
TI: Title
Nano surface engineering and remanufacture engineering
AU: Author
Xu, Bin-Shi
SO: Source
Transactions of the Nonferrous Metals Society of China. Vol. 14, no.
2, pp. 1-5. Oct. 2004
DE: Descriptors
Nanoengineering; Surface treatment; Manufacturing engineering;
Nanomaterials; Remanufacturing; Electroplating; Brush plating; Thermal
spraying; Antifriction
AB: Abstract
Nano surface engineering and remanufacture engineering are introduced,
and the relationship between them is set forth. It points out the
superiority of nano surface engineering to the traditional one, and
reveals the advantages of remanufacture engineering. Taking some nano
surface techniques as samples, such as nano-materials brush
electroplating, nano-materials thermal spraying and nano-materials
self-repairing antifriction additive technology, it shows the
applications of nano surface engineering technology to remanufacturing
mechanical parts.
Record 17 of 64
DN: Database Name
METADEX
TI: Title
In situ synthesis of TiN particulate/titanium silicide matrix
composite powder by mechanochemical process
AU: Author
Shim, Jae-Hyeok; Byun, Jung-Soo; Cho, Young Whan
SO: Source
Journal of the American Ceramic Society. Vol. 87, no. 10, pp.
1853-1858. Oct. 2004
DE: Descriptors
Particulate composites; Titanium nitride; Crystallites; Ceramic matrix
composites; Self-propagating synthesis; Ceramic powders; Ball milling;
Silicides; Silicon nitride; Transmission electron microscopy; X-ray
diffraction; Scanning electron microscopy; Intermetallics
AB: Abstract
TiN particulate/Ti5Si3 matrix composite powder has been synthesized
from Ti and Si3N4 powders employing high-energy ball milling. The
milled powders have been characterized by X-ray diffraction, scanning
electron microscopy, and transmission electron microscopy. TiN/Ti5Si3
composite powder is formed by a displacement reaction between Ti and
Si3N4 during milling, and the reaction progresses in a mechanically
induced self-propagating reaction form. The milled powder consists of
TiN crystallites of a few hundred nanometers embedded in Ti5Si3
matrixes. After 20 h of milling, the crystallite size of TiN becomes
about 5 nm.
Record 18 of 64
DN: Database Name
METADEX
TI: Title
TiNano Coat, a New Thermal Spray Product from Altair Nanotechnologies
SO: Source
Journal of Thermal Spray Technology. Vol. 13, no. 3, pp. 318-319.
Sept. 2004
DE: Descriptors
Nanostructure; Titanium dioxide; Ceramic coatings; Pigments
AB: Abstract
Altair Nanotechnologies, Inc., a company engaged in developing
nanomaterials, titanium dioxide pigment technology, and materials
science focused on nanostruc-tures, has announced that its novel
nano-materials thermal spray grade powder, Ti-Nano Coat, demonstrated
significantly superior mechanical properties in a com-petitive study
performed by the National Research Council (NRC) of Canada. The study
was performed at NRC's state-of-the-art Industrial Materials Institute
fa-cilities in Boucherville, Quebec, from November 2003 through
February 2004. Contact: Marty Tullio or Mark Tullio, McCloud
Communications, LLC; tel: 949/566-9860; e-mail: marty@
mccloudcommunications.com; David A. Warar, Global Strategy, Inc.; tel:
847/ 367-9557; e-mail: dave@global strategy. biz; Altair
Nanotechnologies, Inc., Web: www.altairnano.com.
Record 19 of 64
DN: Database Name
METADEX
TI: Title
Imaging and Analysis of Nanowires
AU: Author
Bell, David C; Wu, Yue; Barrelet, Carl J; Gradecak, Silvija; Lieber,
Charles M; Xiang, Jie; Timko, Brian P
SO: Source
Microscopy Research and Technique. Vol. 64, no. 5-6, pp. 373-389. Aug.
2004
DE: Descriptors
Nanowires; Semiconductors; Heterostructures; Transmission electron
microscopy; Energy dispersive X-ray Spectroscopy; Image analysis
AB: Abstract
We used vapor-liquid-solid (VLS) methods to synthesize discrete
single-element semiconductor nanowires and multicomposition nanowire
heterostructures, and then characterized their structure and
composition using high-resolution electron microscopy (HRTEM) and
analytical electron microscopy techniques. Imaging nanowires requires
the modification of the established HRTEM imaging procedures for bulk
material to take into consideration the effects of finite nanowire
width and thickness. We show that high-resolution atomic structure
images of nanowires less than 6 nm in thickness have lattice
"streaking" due to the finite crystal lattice in two dimensions of the
nanowire structure. Diffraction pattern analysis of nanowires must
also consider the effects of a finite structure producing a large
reciprocal space function, and we demonstrate that the classically
forbidden 1/3 {422} reflections are present in the [111] zone axis
orientation of silicon nanowires due to the finite thickness and
lattice plane edge effects that allow incomplete diffracted beam
cancellation. If the operating conditions are not carefully
considered, we found that HRTEM image delocalization becomes apparent
when employing a field emission transmission electron microscope (TEM)
to image nanowires and such effects have been shown to produce images
of the silicon lattice structure outside of the nanowire itself. We
show that pseudo low-dose imaging methods are effective in reducing
nanowire structure degradation caused by electron beam irradiation. We
also show that scanning TEM (STEM) with energy dispersive X-ray
microanalysis (EDS) is critical in the examination of multicomponent
nanowire heterostructures.
Record 20 of 64
DN: Database Name
METADEX
TI: Title
Computer Modeling of Grain's Growth at Sintering Nano-Materials.
AU: Author
Derevjanko, I; Mikhalyov, A I; Gasik, M I; Vlasova, T E; Projdak, Yu
S
SO: Source
Metalurgija. Vol. 43, no. 3, pp. 214. July-Sept. 2004
DE: Descriptors
Nanomaterials; Computer simulation; Sintering (powder metallurgy);
Grain growth; Grain structure; Chaos theory; Dispersions; Fractals
AB: Abstract
The computer model of grains structure evolution during nanomaterials
reception by sintering is developed. The third final phase of
sintering described by fast attenuation of volumetric condensation and
intensive growth of grains is considered. The influence of temperature
factors of sintering and dispersion of powder for the growth rate of
grains is investigated. The computer modeling has shown, that
intensification of grains growth is a consequence of fractal
properties of structure building processes in the environment of
nanoparticles making chaotic fluctuation.
Record 21 of 64
DN: Database Name
METADEX
TI: Title
Molecular dynamics simulation of tensile mechanical properties of
nano-single crystal argon.
AU: Author
Liu, Y-H; Liu, X; Huang, H-M; Xue, M-D
SO: Source
Hangkong Cailiao Xuebao (J. Aeronaut. Mater.) (China). Vol. 24, no. 4,
pp. 49-53. July-Aug. 2004
DE: Descriptors
Nanomaterials; Nanostructure; Computer simulation; Single crystals;
Argon; Face centered cubic lattices; Molecular dynamics; Fracture
mechanics; Tensile properties; Solidified gases; Mechanical
properties; Brittle materials; Brittleness; Coalescing; Nanocrystals;
Brittle fracture; Separation; Nanocomposites
AB: Abstract
Single-crystal FCC cubic argon at nanolevel at two different constant
rates of uniaxial tensile loading (2.16 m/s, 6.49 m/s) is studied by
molecular dynamics (MD) using L-J(12-6) inter atomic potential.
Deformation and fracture of the work materials duo to voids formation,
their coalescence into nanocracks, and subsequent fracture or
separation were observed similar to their behavior at macroscale. The
true stress-strain diagrams obtained by the MD simulation of the
tensile specimens show a long slow increase in stress with a gradual
increase in strain, and a rapid increase in stress up to a maximum
when the value of strain reaches a certain value followed by a sudden
drop to negative or a sudden disappear when the specimen fails by
brittle fracture. The rate of loading plays an important role in the
ultimate strength of the nanomaterials. The ultimate strengths are 2.6
GPa and 6.6 GPa separately corresponding to the rates of loading 2.16
m/s and 6.49 m/s. The nanomaterial underwent much more deformation
before its sudden rupture than ordinary brittle materials. The brittle
rupture form is absolutely different from the ductile rupture form
reported previously about ordinary nano-materials. In addition, the
specimens after relaxation were found to be slightly tensile due to
internal forces, which is different from the compressed form reported
recently for the specimens of FCC materials, such as Al, Cu, Ni, et
al, after relaxation.
Record 22 of 64
DN: Database Name
METADEX
TI: Title
Nano-Scale Magnetism.
AU: Author
Gibbs, M R J
SO: Source
Materials Technology (UK). Vol. 19, no. 2, pp. 98-101. June 2004
DE: Descriptors
Nanomaterials; Magnetic materials; Magnetism; Magnetic properties;
Magnets; Thin films
AB: Abstract
In order to structure this overview for the general reader a number of
subsections will be used. We will begin with an overview of key
concepts in nano-magnetism, thereby defining a number of physical
parameters which can be controlled by nano-materials engineering once
the physics is elucidated. Three broad categories of nano-scale
magnetic material can be defined. One is where the samples themselves
are bulk, but where the technologically crucial parameters are
dictated by structural features on the nanometre scale. These
materials represent the nano-magnets currently commercially available,
and where most of the basic science and property optimisation is well
understood. Another category is where thin films of magnetic material
are deposited such that one dimension at least is in the nanometre
range. This is the area which is of great significance in such
applications as data storage. The technically significant parameters
are governed by the chemistry, geometry and separation of the layers.
A further category can be made from those magnetic assemblies where
patterning (using lithography) or self-assembly (using templating) are
used to control the overall properties. The individual elements have
properties dictated by the dimensions and element spacings. A final
category is where the magnetic material is in the form of
nano-particles. Nature has much to teach us here. For example,
magneto-tactic bacteria find the mud at the bottom of ponds with the
aid of an embedded magnetic nano-particle and the local Earth's field
vector.
Record 23 of 64
DN: Database Name
METADEX
TI: Title
Heat-Affected Behavior of the Magnetic Properties of Iron
Nano-Particles
AU: Author
Liu, Gang; Lu, Nan; Qin, Xiong; Fan, Rong-Huan; Guo, Yuan-Bo
SO: Source
Transactions of Tianjin University. Vol. 10, no. 2, pp. 85-90. June
2004
DE: Descriptors
Nanostructure; Iron; Magnetic properties; Magnetic induction;
Saturation; Iron and steel industry; Shells; Stoves; Transmission
electron microscopy; Surface energy; Air heaters; Combustion; Coercive
force; Single crystals
AB: Abstract
The high surface energy makes metal nano-particles reactive and easy
to get oxidized or burned in the open air, which results in decreasing
or entirely losing their functions and properties. In this paper, the
magnetic property behavior of iron nano-particle, which is one kind of
the typical magnetic nano-materials, has been investigated. The iron
nano-particles were heated to different temperatures in an open-air
stove. After that, they were firstly examined by TEM to observe the
changes of their outline of shapes and then measured by VSM to trace
the changes of their magnetic properties. The test results show that
iron nano-particles can keep their magnetic property with saturation
magnetic induction intensity Bs around 136-161 emu/g, remanent
magnetic induction intensity Br around 14. 8-17.4 emu/g and coercive
force Hc around 290-302 Oe when the temperature goes up to 523 K. The
explanation to such outstanding oxidization-proof ability has been
given that there exists a single crystal and lattice-shared
Gamma-Fe2O3 shell covering the pure iron core, which prevents the
spherical iron nano-particles from further oxidization.
Record 24 of 64
DN: Database Name
MicroPatent Materials Patents
TI: Title
A PROCESS FOR BIOCHEMICAL TREATMENT OF WASTE WATER USING NANO
MATERIALS
AB: Abstract
The present invention relates to a process for biochemical treatment
of waste water. The process uses a nano material to induce micro to
degrade organic pollutants in the waste water which are generally
unable or hard to be degraded and thereby greatly enhance the effect
of biological cleaning of waste water. The nano material comprises one
or more of the group consisting of titania, silicon-based oxide,
ferric oxide, zinc oxide, metal iron powder and carbon black. The
effect is more prominent for the waste water that is hard to treat by
the conventional biochemical treatment, high concentration waste
water, and highly poisonous waste water. The process of the present
invention is widely usable in the aerobic, oxygen-facultative or
anaerobic biochemical treatment systems.
Record 25 of 64
DN: Database Name
MicroPatent Materials Patents
TI: Title
Methods for the preparation of nanosized material particles
AB: Abstract
The present invention relates to a method for the production of
particles of nano-materials being transition metals and alloys; metal
oxides; and ceramic compositions having a small nanosize, i.e. about
1-6 nm. The method comprises a synthesis in the solutions of complex
liquids from suitable precursors, which precursors are selected from
suitable surfactants and alkoxides, by a suitable chemical reaction
under mild conditions; and preparing from said materials fine colloids
dispersed in various polymer solutions. The water in the solution is
preferably non freezing water, the mild conditions are atmospheric
pressure and a temperature range of room temperature to 70 C., and the
reaction condition is selected among a hydrolysis, reduction and
exchange process.
Record 26 of 64
DN: Database Name
METADEX
TI: Title
Tribological study of nanolubricating materials.
AU: Author
Xue, M-Q; Xiong, D-S; Yan, J
SO: Source
Materials for Mechanical Engineering (China). Vol. 28, no. 3, pp.
47-50. Mar. 2004
DE: Descriptors
Tribology; Lubricants; Additives; Nanomaterials
AB: Abstract
With the development of nano-materials and nanotribology, more and
more material scientists pay attention to the tribological properties
of nanomaterials. This article gives a review on tribological
properties of nanoparticles used as reinforced materials, lubricant
additive and ultrathin nanofilms. Same suggestions have been presented
in the development and research of nanolubricating materials.
Record 27 of 64
DN: Database Name
Recent References Related to Technology
TI: Title
Nanophase Technologies new nanomaterials
SO: Source
III-Vs Review: The Advanced Semiconductor Magazine, vol. 17, pp. 26,
Feb. 2004
DE: Descriptors
Nanostructure; Nanomaterials; Nanocomposites; Semiconductors;
Commercial
AB: Abstract
Nanophase Technologies Corporation, a nano materials and nano
engineer, announced commercial availability of a new class of
cerium-based oxide nano-material from its patented NanoArc
technology.
Record 28 of 64
DN: Database Name
METADEX
TI: Title
Mechanochemical synthesis of nanocomposite powder for ultrafine (Ti,
Mo)C-Ni cermet without core-rim structure
AU: Author
Kim, Young Kwan; Shim, Jae-Hyeok; Cho, Young Whan; Yang, Hyo-Seung;
Park, Jong-Ku
SO: Source
International Journal of Refractory Metals & Hard Materials. Vol.
22, no. 4-5, pp. 193-196. 2004
DE: Descriptors
Nickel; Titanium carbide; Molybdenum carbides; Nanoparticles; Cermets;
Ball milling; Synthesis; Ultrafines; Grain structure; Sintering;
Nanocomposites; Core-shell structure; Nanostructure; Nanomaterials;
Morphology; Density
AB: Abstract
An extremely fine and homogeneous (Ti, Mo)C-Ni nanocomposite powder
was synthesized by high-energy ball milling of a mixture of Ti, Mo,
Ni, and C powders. The nanocomposite powder was sintered to full
density and a homogeneous grain structure has been obtained instead of
the usual core-rim microstructure.
Record 29 of 64
DN: Database Name
METADEX
TI: Title
Processing of MMC Reinforced with Small-size Particles
AU: Author
Popov, V; Aksenov, A; Lesuer, D; Vershinina, E; Smirnov, O; Marmulev,
A
SO: Source
Materials Forum. Vol. 28, pp. 1046-1050. 2004
DE: Descriptors
Metal matrix composites; Particulate composites; Nanostructure;
Nanocomposites; Mechanical alloying; Nanomaterials
AB: Abstract
This paper discusses the development of new methods of producing metal
matrix composites (MMC). As theoretical estimates show that it is not
preferable to use liquid phase methods for producing MMC with
reinforcing particles of less than 1mum, the focus was on the
development of MMC production methods without liquid-phase formation.
Two methods were developed: a) based on nano-materials and b) based on
mechanical alloying. The developed methods produce high-quality metal
matrix composites with various-size reinforcing particles (including
those less than 200 nm).
Record 30 of 64
DN: Database Name
METADEX
TI: Title
Positron Annihilation ICPA-13: Proceedings of the 13th International
Conference on Positron Annihilation
AU: Author
Hyodo, T; Kobayashi, Y; Magashima, Y; Saito, H
SO: Source
Materials Science Forum. Vol. 445-446, pp. 542. 2004
DE: Descriptors
Positron annihilation; Positronium; Nanostructure; Nanomaterials
AB: Abstract
The papers reported recent developments in fields of research using
positrons. They include nano-materials, electronic structure and
defects in metals, alloys and semiconductors, porous materials and
low-k dielectrics, polymers, liquids, atomic physics and physical
chemistry involving positrons and positronium, and instrumentation.
Published in Materials Science Forum. 156 papers selected and
abstracted for Metals Abstracts.
Record 31 of 64
DN: Database Name
METADEX
TI: Title
Micro nano science and technology.
AU: Author
Miyayama, Katsu
SO: Source
Seisan-Kenkyu (Journal of Institute of Industrial Science, University
of Tokyo). Vol. 56, no. 4, pp. 26-31. 2004
DE: Descriptors
Nanotechnology
AB: Abstract
Article relates to the constitution and concept of micro nano science
and technology research integration, research summarization, and
contribution of the integration on the future society. The integration
consists of four research groups, i.e. material nano dynamics, design
of self-organization nano materials, micro mechatronics, and study
network and nano electronics.
Record 32 of 64
DN: Database Name
Recent References Related to Technology
TI: Title
Research Development of Wood - Inorganic Composites
SO: Source
Dongbei Linye Daxue Xuebao (Journal of Northeast Forestry University)
(China), vol. 32, pp. 64-67, 25 Jan. 2004
DE: Descriptors
Wood; Nanostructure; Classification; Fabrication; Forestry;
Manufacturing engineering
AB: Abstract
The basic connotation and classification of wood - inorganic
composites were briefly expounded, and the fabricated methods at home
and abroad for recent years as well as some update research
development on wood - inorganic composites were also reviewed
synthetically. It suggested that the application of inorganic - nano
materials to wood science and technology would bring forward a new
impetus for wood - inorganic research.
Record 33 of 64
DN: Database Name
Recent References Related to Technology
TI: Title
Functional Macromolecular Nano-materials based on Living
Polymerization and Selfassembling Process
SO: Source
Polymeric Materials Science and Engineering, vol. 90, Spring 2004
DE: Descriptors
Nanostructure; Polymerization; Functionals; Radicals; Polymers;
Monomers; Atomic structure; Stability; Brushes; Engineering; Molecular
weight; Separation; Molecular structure; Macromolecules; Atomic
properties; Block copolymers
AB: Abstract
Recent remarkable progress on precision polymerization such as atom
transfer radical polymerization (ATRP)' allows one to develop various
kinds of nano-structured materials based on precisely designed
macromolecules with respect to molecular weight, polymer sequence, and
so on, which determines their own shapes as the controllable structure
parameters. Along this line, we have set our objective to demonstrate
nano-structured materials by use of the living polymerization of
functional monomers and the self-assembling process. Here, we report
(1) functional polymer brush, (2) highly ordered nano-structures of
amphiphilic functional block copolymers through micro-phase
separation, and (3) growing macromolecular nano-objects, by making
free use of atom transfer radical polymerization.
Record 34 of 64
DN: Database Name
METADEX
TI: Title
Advance in application and research of zinc and zinc-aluminum alloys.
AU: Author
Gu, C.; Zhang, W.; Jin, H.; Wu, J.; Li, T.; Xiong, T.
SO: Source
Nonferrous Metals (China). Vol. 55, no. 4, pp. 44-47. Nov. 2003
DE: Descriptors
Zinc base alloys; Development; Zinc; Protective coatings; Electrodes;
Nanomaterials
AB: Abstract
The scheme of the world zinc consumption is analyzed. The situation of
the research and application of zinc and zinc-aluminum alloy are
reviewed. Furthermore, some new progress are also put forward for
further study. The hot spots of the investigation on anode material,
nano-materials, composite, coating materials of zinc and zinc-aluminum
are introduced.
Record 35 of 64
DN: Database Name
Recent References Related to Technology
TI: Title
Research on Dispersing Properties of Nano-materials in Latex Paints
SO: Source
Zhongguo Kuangye Daxue Xuebao (Journal of China University of Mining
& Technology), vol. 32, pp. 689-693, Nov. 2003
DE: Descriptors
Titanium dioxide; Silicon dioxide; Nanostructure; Dispersing; Coating;
Nanomaterials
AB: Abstract
The dispersing property and UV-proof property of nano-materials (such
as nano-TiO2, nano-SiO2-x) in latex paints were studied. The
relationship between nano-materials and coating property was analyzed.
The coatings containing nanomaterials was prepared by processing
nano-particles with special agents and proper dispersing process. The
results show that the key for nano-coating to become an industrialized
product is the effective dispersing and stable storing of
nano-materials in the coatings. The results also show that the latex
paints containing 0. 4 % nano-TiO2 can effectively improve the
synthetic properties, especially the shielding property of coatings.
Record 36 of 64
DN: Database Name
METADEX
TI: Title
Damage Mechanisms in Nanolayered Metallic Composites.
AU: Author
Misra, A; Kung, H; Hammon, D; Hoagland, R G; Nastasi, M
SO: Source
International Journal of Damage Mechanics. Vol. 12, no. 4, pp.
365-376. Oct. 2003
DE: Descriptors
Multilayers; Mechanical properties; Copper; Composite materials;
Niobium; Nanomaterials; Damage; Plastic deformation; Fatigue
(materials); Tensile strength; Hardness; Strain
AB: Abstract
The strengths of metallic multilayers, composed of alternating layers
of soft metals such as Cu and Nb, approach the theoretical limit of
material strength when the bilayer periods are on the order of a few
nanometers. We have investigated the damage mechanisms in these
ultra-high strength nanolayered composite materials subjected to
monotonic deformation. Large strain plastic deformation such as room
temperature rolling does not lead to any dislocation cell structure
formation within the layers indicating that the deformation and
dislocation storage mechanisms in nanostructured materials are
completely different from the bulk. In bulk metals, dislocation
pile-ups lead to heterogeneous slip, but in nano-materials,
deformation by single dislocations on closely spaced glide planes
results in more homogeneously distributed slip. The implications of
the high tensile strengths and homogeneous slip on the fatigue
properties of nanolayered materials are also discussed.
Record 37 of 64
DN: Database Name
METADEX
TI: Title
Atomic-scale characterization of nanostructured metallic materials by
HAADF/Z-contrast STEM.
AU: Author
Abe, E
SO: Source
Materials Transactions. Vol. 44, no. 10, pp. 2035-2041. Oct. 2003
DE: Descriptors
Transmission electron microscopy; Chemical composition; Aluminum base
alloys; Metallography; Magnesium base alloys; Nanostructure;
Nanomaterials; Scanning electron microscopy
AB: Abstract
We demonstrate that high-angle annular-dark-field scanning
transmission electron microscopy (HAADF-STEM) with a finely-focused
electron probe (#~0.15 nm) is very powerful technique to provide
direct information on a local chemistry of nano-materials at atomic
scale. This is due to an atomic-number (Z) sensitive nature of the
HAADF contrast (Z-contrast). We describe the microstructures of some
crystalline, quasicrystalline and amorphous metallic materials with
focusing on their local chemical environments. Not only the chemical
Z-contrast, HAADF-STEM possesses more substantial advantages compared
to the conventional phase-contrast high-resolution imaging, so that it
would be one of the most powerful methods for total characterization
of nano-structured materials. (Example materials: aluminum base
alloys, magnesium base alloys.)
Record 38 of 64
DN: Database Name
METADEX
TI: Title
DIFFUSION OF HYDROGEN IN AMORPHOUS, HIGH DEFORMED
NANOCRYSTALLINE
ALLOYS
AU: Author
Timofeyev, N I; Rudenko, V K; Kondratyev, V V; Gapontsev, A V;
Voloshinskii, A N
SO: Source
Hydrogen Materials Science and Chemistry of Carbon Nanomaterials. Vol.
II. Mathematics, Physics and Chemistry - Volume 172, pp. 617-634.
2004
DE: Descriptors
Amorphous materials; Nanomaterials; Diffusion coefficient;
Deformation; Correlation analysis; Diffusion effects; Constraining;
Mathematical analysis; Permeability; Fluctuation; Interstitial
impurities
AB: Abstract
The approach, which was proposed earlier for calculation of the
chemical diffusion coefficient of hydrogen in alloys and "two-phase"
systems, was used to analyze the diffusion behavior of disordered
AND
materials taking into account a non-zero partial molar volume of
interstitial impurity atoms. Explicit expressions for the hydrogen
diffusion coefficient in amorphous metals and alloys and "two-phase"
systems have been obtained. The temperature and concentration
dependences of permeability of amorphous metals have been determined.
The effect of the correlation in the distribution of static
fluctuations of the free volume on diffusion properties of amorphous
materials has been analyzed. Some limiting cases have been discussed.
Types of the diffusion behavior of strongly deformed and
nanocrystalline metals have been classified. It was concluded that the
transfer of hydrogen under conditions of quasi-volume diffusion is
insensitive to the structure of these materials.
Record 39 of 64
DN: Database Name
METADEX
TI: Title
Silver in Nano - Materials.
AU: Author
Ning, Y-T; Zhao, H-Z
SO: Source
Guijinshu (Precious Metals). Vol. 24, no. 3, pp. 54-60. Sept. 2003
DE: Descriptors
Nanostructure; Silver; Microstructure; Nanomaterials
AB: Abstract
A variety of silver nano - materials and their preparation methods
were introduced. Some properties of silver nano - materials were
reviewed. The current and potential applications of silver nano materials were analyzed.
Record 40 of 64
DN: Database Name
METADEX
TI: Title
Measurement of Decay Process of Photoelectrons from ZnO by Microwave
Absorption Method.
AU: Author
Dong, G-Y; Fu, G-S; Wei, Z-R; Yang, S-P; Wang, L-M; Dou, J-H; Li, X-W
SO: Source
Faguang Xuebao/Chinese Journal of Luminescence. Vol. 24, no. 4, pp.
339-341. Aug. 2003
DE: Descriptors
Zinc oxides; Photoelectrons; Microcrystals; Semiconductors
(materials); Decay; Electrons; Microwave absorption; Bands; Conduction
bands; Energy levels; Defects; Energy; Crystals; Excitation;
Migration; Particle decay; Ultraviolet radiation; Electron
recombination; Crystal defects
AB: Abstract
Illuminated by ultraviolet light, the electrons in semiconductor
transfer from valence band to conduction band with the absorption of
photo energy, the formation of free electrons and hole carriers. The
electrons in the processes of migration in the conduction band may be
affected by different defect energy level, such as being captured by
electron traps, recombination with luminescent centers, or
recombination with the hole carrier in valence band. The investigation
of the decay processes of photoelectrons in conduction band is helpful
in achieving an understanding of the energy level structure for
semiconductor materials. Contactless measurement of the decay
processes of photoelectrons of microcrystal materials and powder
semiconductor materials can be carried out using the microwave
absorption dielectric spectrum detection technique, with high
precision and low interference. ZnO crystals is a kind of
semiconductor materials with a band with an energy gap of 3.37eV at
room temperature. The ZnO experimental samples are prepared using
hydrothermal synthesis method that is often used in preparation of
high purity and fine dispersion ZnO crystals. The decay processes of
photoelectrons of nano ZnO materials and ZnO microcrystal materials
have been measured respectively in this paper by using microwave
absorption method. The photoelectron time-resolved spectrum of nano
ZnO and ZnO microcrystals were obtained. The evidence difference of
photoelectron lifetime between two kinds of materials was found after
excitation with a short-pulse laser. The photoelectron lifetime of
nano ZnO was found only to be 10ns and the photoelectron lifetime of
ZnO microcrystals was found to be 50ns. It is believed that the
photoelectron lifetime of nano ZnO is shorter than that of ZnO
microcrystals because the surface area of nano material is larger than
that of microcrystal materials. The defect energy levels on the
surface area of nano materials also result in the increasing of
recombination rate of the photoelectrons.
Record 41 of 64
DN: Database Name
METADEX
TI: Title
Research on Sonochemical Preparation of Nano-Materials.
AU: Author
Wang, J; Hu, Y; Chen, Z
SO: Source
Xiyou Jinshu Cailiao yu Gongcheng (Rare Metal Materials and
Engineering). Vol. 32, no. 8, pp. 585-590. Aug. 2003
DE: Descriptors
Nanomaterials; Synthesis; Nanocomposites; Polymer matrix composites;
Precursors
AB: Abstract
Sonochemistry has developed very quickly during recent two decades.
The science of sonochemical synthesis of nanosized materials is
reviewed in this paper. After a description of the fundamentals of
sonochemistry, the progress on sonochemical sythesis of nanosized
materials from the precursors of volatile metal organometallic
compounds and metal salts was introduced and discussed.
Sonoelectrochemical methods of metal nanopowders and the sonochemical
sythesis of inorganic -- polymer composites were emphasized. Moreover,
future prospect in application of ultrasound nanosized materials, was
presented.
Record 42 of 64
DN: Database Name
METADEX
TI: Title
Application of nanomaterials in automotive industry.
AU: Author
Shen, H; Wang, X-G; Zhang, J-R; Zhang, J-J
SO: Source
Materials for Mechanical Engineering (China). Vol. 27, no. 7, pp. 3-5.
July 2003
DE: Descriptors
Nanomaterials; Development; Protective coatings; Automobiles;
Materials selection; Automotive engineering; Automotive industry;
Automotive components; Oxidizing agents; Mechanical engineering;
Cleaning; Pollution; Hydrogen; Coatings
AB: Abstract
The application of nanomaterials in the automotive industry is
introduced. The principle of hydrogen conservation, the property, the
cost and future application in hydrogen-driven automobiles for some
nano-materials are analyzed. To decrease the pollution of let-off gas,
nano rare earth oxidants may be used in the cleanser of autos. The
development and application of nanomaterials in automobile coatings
are also explained.
Record 43 of 64
DN: Database Name
METADEX
TI: Title
Computational materials science: the emergence of predictive
capabilities of material behaviour.
AU: Author
Kumar, V
SO: Source
Sadhana. Vol. 28, no. 3-4, pp. 815-831. June-Aug. 2003
DE: Descriptors
Nanostructure; Computer simulation; Steels; Microstructure;
Mathematical analysis
AB: Abstract
The availability of high performance computers and development of
efficient algorithms has led to the emergence of computational
materials science as the third branch of materials research
complementing the traditional theoretical and experimental approaches.
It has created new virtual realities in materials design that are
either experimentally not realizable easily or are prohibitively
expensive. The possibilities of doing calculations from first
principles have led to predictive capabilities that open up new
avenues of discovering novel materials with desired properties,
understanding material behaviour on the nano- to the macroscopic scale
and helping research in new frontiers that could interface between
nano-materials and drug design, as well as in understanding biological
systems. Here, we describe some significant recent developments
related to alloy and steel design as well as the study of matter on
the nano-scale - an area that has gained much prominence in current
materials research.
Record 44 of 64
DN: Database Name
METADEX
TI: Title
Development of Pressure Control Technique of An Arc-Submerged
Nanoparticle Synthesis System (ASNSS) for Copper Nanoparticle
Fabrication.
AU: Author
Tsung, T-T; Change, H; Chen, L-C; Han, L-L; Lo, C-H; Liu, M-K
SO: Source
Materials Transactions. Vol. 44, no. 6, pp. 1138-1142. June 2003
DE: Descriptors
Nanostructure; Nanomaterials; Copper; Powder technology; Vacuum
chambers; Pressure; Submerged arc electric furnaces; Control systems
AB: Abstract
The synthesis of nano-materials is one of the crucial techniques
towards product and process innovation. In this article, low-pressure
control methods for an arc-submerged nanoparticle synthesis system
(ASNSS) was proposed and developed for copper nanoparticle
fabrication. Two technical advances associated with nanoparticle
synthesis were achieved. One is the novel pressure control technique
developed for nanoparticle fabrication. The other is the verification
that the constant low-operating pressure plays an important role in
determining the characteristics of the prepared nanoparticles. From
the experimental results, pressure control of the ASNSS was identified
as crucial to success of metal nanoparticle synthesis. To achieve the
desired pressure control, a vacuum chamber was developed as a
nanoparticle accumulator and low-pressure reservoir. The chamber was
controlled by the proposed flow-valve feedback control system and
integrated with the ASNSS. In this study, the pressure control
equipment of the ASNSS was effectively developed to prepare desired
copper nanocrystalline particles with well-controlled size.
Record 45 of 64
DN: Database Name
METADEX
TI: Title
Pretreatment processing and its materials for metal painting based on
environmental protection consciousness.
AU: Author
Wang, Z-Z; Wu, H
SO: Source
Heat Treatment of Metals (China) , no. 3, pp. 63-66. Mar. 2003
DE: Descriptors
Surface pretreatments; Painting; Industrial wastes; Environment
AB: Abstract
On account of the heavy environmental pollution in the pretreatment
processing for metal painting, the pretreatment processing and its
materials based on environmental protection consciousness are
introduced in terms of using effective cleaning-water, improving
various chemical solution, utilizing comprehensively waste and so on.
It highlights the significant application of ultrasonic technology and
nano-materials in improving the environment condition for the
pretreatment processing.
Record 46 of 64
DN: Database Name
METADEX
TI: Title
Progress of nano-surface engineering.
AU: Author
Xu, B; Liang, X; Dong, M S; Ma, S
SO: Source
International Journal of Materials and Product Technology. Vol. 18,
no. 4-6, pp. 338-343. 2003
DE: Descriptors
Nanomaterials; Surface finishing; Amorphous materials; Composite
materials; Adhesives; Thermal spraying; Brush plating; Tribology
AB: Abstract
Applications and developments of materials perform significant
functions in accelerating the progress of surface engineering.
Composite materials, nano-materials, amorphous materials, functional
materials and other advanced materials have become the popular trend
for utilizing materials in surface engineering. Recently, surface
engineering has been promoted by nanometre technology. The new
achievement of nano-surface engineering such as nano-thermal spraying,
nano-brush plating, nanocomplex additive, nano-tribological logical
dry film and nano-adhesive technologies are introduced in this paper.
Nano-surface engineering will enrich the concept of surface
engineering and has shown powerful vital force in industry field.
Record 47 of 64
DN: Database Name
METADEX
TI: Title
Pinpoint characterization of nano-materials using FIB technique.
AU: Author
Kamino, T; Yaguchi, T; Konno, M; Hashimoto, T
SO: Source
Hyomen Gijutsu (Journal of the Surface Finishing Society of Japan).
Vol. 53, no. 12, pp. 899-901. Dec. 2002
DE: Descriptors
Thin films; Metallography; Specimen preparation; Ion beams;
Transmission electron microscopy; Characterization; Specimens;
Processing; Scanning; Preparation; Principles; Sampling; Data; Coils;
Mirrors; Electron microscopes; Chambers; Transmission; Pretreatment
AB: Abstract
Article describes principles of focused ion beam (FIB) processing,
preparation of thin film specimens for transmission electron
microscope (TEM), and pinpoint characterization with FIB and TEM
(scanning TEM). The mirror body of FIB processing apparatus is
composed of a ion gun, convergent lens, scanning coil, objective lens,
and specimen chamber. Preparation of film specimens includes
pretreatment, FIB processing, and isolation of characterized places
(FIB liftout and micro sampling methods). As data obtained from
specimens in specific thickness are often insufficient for full
characterization of micro-fine and complex structures, a
three-dimensional structure characterization has been developed using
FIB and TEM.
Record 48 of 64
DN: Database Name
MicroPatent Materials Patents
TI: Title
A PROCESS FOR BIOCHEMICAL TREATMENT OF WASTE WATER USING NANO
MATERIALS
AB: Abstract
The present invention relates to a process for biochemical treatment
of waste water. The process uses a nano material to induce micro to
degrade organic pollutants in the waste water which are generally
unable or hard to be degraded and thereby greatly enhance the effect
of biological cleaning of waste water. The nano material comprises one
or more of the group consisting of titania, silicon-based oxide,
ferric oxide, zinc oxide, metal iron powder and carbon black. The
effect is more prominent for the waste water that is hard to treat by
the conventional biochemical treatment, high concentration waste
water, and highly poisonous waste water. The process of the present
invention is widely usable in the aerobic, oxygen-facultative or
anaerobic biochemical treatment systems.
Record 49 of 64
DN: Database Name
METADEX
TI: Title
On the development of microstructure in a metal matrix composite using
nano-materials
AU: Author
Popov, V A; Lesuer, D R; Kotov, I A; Ivanov, V V; Aksenov, A A;
Khodos, I I; Klimenko, G L; Smirnov, O M; Murzakaev, A M; Zayats, S V
SO: Source
Ultrafine Grained Materials II (as held at the 2002 TMS Annual
Meeting); Seattle, WA; USA; 17-21 Feb. 2002. pp. 289-295. 2002
DE: Descriptors
Nanomaterials; Powder technology; Particulate composites; Aluminum;
Composite materials; Silicon carbide; Pressing; Compacting; Live
loads; Morphology; Grain size
AB: Abstract
Metal matrix composites (MMCs) containing matrices with nanometer
grain sizes have been produced from pure aluminum nano-powders
(particle sizes 50 - 200 nm) with SiC reinforcement (particle sizes
3-10 mu m). The pure Al nano-powders were produced using an exploding
wire technique. Dynamic loading using a magnetic impulse technique has
been used to compact the MMC to high density. The dynamic compaction
process results in excellent wetting of the SiC particles by the
nanocrystalline Al powders, and the retention of a nano-crystalline
grain size in the MMC. Microstructural analysis of the resulting MMC
showed a highly uniform distribution of SiC particles with no visible
defects or pores and the absence of deleterious phases (such as Al sub
4 C sub 3 ) at the interfaces between the aluminum nano-grains and the
SiC particles. The microstructures produced and the evolution of
microstructure during dynamic compaction has also been studied using
TEM and found to progress in three stages. These three stages are
described.
Record 50 of 64
DN: Database Name
METADEX
TI: Title
Science and technology of nanostructured materials
AU: Author
Naka, M
SO: Source
Journal of High Temperature Society of Japan (Japan). Vol. 28, no. 1,
pp. 4-7. Jan. 2002
DE: Descriptors
Cobalt; Composite materials; Tungsten carbide; Drill bits; Materials
selection; Nanomaterials; End uses; Hardness; Toughness; Nylons;
Silicon dioxide; Nanocomposites; Fire resistance
AB: Abstract
Control of nano scale materials has become an important project in
fields of physics, chemistry, material science, biology, medicine, and
computer engineering, etc. Article summarizes the study situation of
fabrication, properties, and applications of nano materials. Nano
materials may be classified by their morphology into particles, films,
surfactants, bulk materials, and high functional devices. Various
preparation methods have been reported, for example sol-gel,
high-energy ball mill, laser ablation, and hydrothermal synthesis,
condensation in an inert gas, high-speed sputter, and mechanical
alloying and so on. WC/Co nano drill edges with both of increased
hardness and toughness have been applied to industrial production.
Nylon comprising nano silica particles displays good fire resistance.
Applications of nano particles are tabulated to catalyst, photography,
medicine, colloid science, and magnetic media.
Record 51 of 64
DN: Database Name
METADEX
TI: Title
Engineering of a magnetic anisotropy using particles embedded in
nano-multilayer structures
AU: Author
Jeon, I-J; Kang, D-W; Kim, D-E; Kim, D-H; Choe, S-B; Shin, S-C
SO: Source
Applied Surface Science (Netherlands). Vol. 197-198, pp. 639-643. 30
Sept. 2002
DE: Descriptors
Nanomaterials; Magnetic properties; Multilayers; Cobalt; Composite
materials; Platinum; Laser processing; Vapor deposition; Magnetic
anisotropy; Magnetization
AB: Abstract
We report the manipulation of magnetic anisotropy in a Co/Pt
nano-multilayer (nano-ML) system with particles being embedded. The
samples, fabricated by a newly-developed normal incidence pulsed laser
deposition (NIPLD) method have salient magnetic characteristics,
different from particle-free samples of almost the same structure: (1)
they exhibit biaxial magnetic anisotropies and (2) there exists a
critical field at which the change in easy direction from a parallel
direction to a perpendicular direction and vice versa. By the careful
manipulation of particles and nano-layers, we also demonstrate the
control of the degree of magnetic anisotropy by embedding particles in
a well-defined nano-ML system: uniaxial anisotropy to biaxial one and
vice versa. This work, indeed, clearly shows that the integration of
nano-building blocks into nano-structures can tailor properties of
nano-materials.
Record 52 of 64
DN: Database Name
METADEX
TI: Title
The preparation and properties of NiAl(Co) intermetallic bulk
nano-materials
AU: Author
Li, B; Xia, D-S; Guo, J-T; Li, G-S
SO: Source
Journal of Northeastern University, Natural Science (China) (China).
Vol. 22, no. 5, pp. 584-587. Oct. 2001
DE: Descriptors
Nickel compounds; Powder technology; Aluminum compounds; Cobalt
compounds; Nanomaterials; Hot pressing; Compression tests
AB: Abstract
The NiAl(Co)bulk nano-materials with the grain from 300 to 480 nm and
91% densified degree of the compacts, were prepared by NiAl(Co)
nano-powder by hot pressing (HP). At room temperature, the compress
yields strength of bulk nano-material is 1250 approx = 1400 MPa, which
is 3.1 approx = 3.5 times than that of the cast NiAl. In the
compressive experiments the nano-materials have good compressive
plasticity at room temperature, Ni sub 50 Al sub 40 Co sub 10
nano-materials can be compressed higher than 30% without crack, and Ni
sub 50 Al sub 45 Co sub 5 nano-materials in 980 deg C can be
compressed 19. 5% without fracture. Moreover, the properties of the
double phase nano-materials containing gamma ' are better than to
those of single phase nano-materials.
Record 53 of 64
DN: Database Name
METADEX
TI: Title
Processing of nano-materials
AU: Author
Li, J; Huang, Y; Shen, Y
SO: Source
Cailiao Kexue yu Gongcheng (Materials Science and Engineering) (China)
(China). Vol. 19, pp. 117-121. July-Sept. 2001
DE: Descriptors
Titanium compounds; Synthesis; Aluminum compounds; Intermetallics;
Ferrous alloys; Nanomaterials; Sintering (powder metallurgy)
AB: Abstract
The paper summarizes the nanomaterial synthesis methods which includes
chemical synthesis, thermo physical synthesis and mechanical
synthesis. As well as the conventional sintering method, the pressure
consolidation methods and some special sintering methods such as hot
isostatic forging, field activated sintering, microwave sintering and
field-assisted sintering are introduced. The methods, to control the
nanocrystal growth are presented.
Record 54 of 64
DN: Database Name
METADEX
TI: Title
Preparation of nanomaterials by reactive ball milling
AU: Author
Zhang, X; Zhu, X; Yan, B; Cheng, B
SO: Source
Cailiao Kexue yu Gongcheng (Materials Science and Engineering) (China)
(China). Vol. 19, pp. 95-99. Apr.-June 2001
DE: Descriptors
Nanomaterials; Machining; Ball milling; Density; Interfaces;
Self-propagating synthesis
AB: Abstract
The study and application of nano-materials prepared by reactive ball
milling (RBM) are summarized. The RBM mechanism is discussed
emphatically. The study indicates that the high-density limitation and
the nanointerface can accelerate greatly the progress of SHS. The
reaction can go along in the nanostate.
Record 55 of 64
DN: Database Name
MicroPatent Materials Patents
TI: Title
Method to produce three dimensional objects by stereolithography
AB: Abstract
<H>Stereolithographic object formation in resin bath, resulting in
greatly improved physical properties, is enhanced by filler addition
with other diverse operations. e.g. bubble formation and
stabilization, surface coating and activation</H><P>Particles
conferring physical and/or mechanical properties are added or formed
in the bath, during laser irradiation. They are mixed in. Laser
irradiation bonds the particles into hardened resin, and/or to the
resin and/or to each other. <P> Preferred features: The particles are
mixed in and distributed, in solid and/or liquid and /or gaseous form.
Particles in liquid or solid form are provided with surface gas
bubbles, or bubbles within them. Particles are converted into gaseous
form by the laser irradiation. The particles are introduced as
nano-materials in the form of nano-metals or nano-fluids.
Preferably-liquid particles are coated with a parting layer,
preventing dissolution into the bath. A coating fosters bonding of
particles with resin or to each other. Particles are encased at high
concentration by a layer capable of sintering or agglomeration by
laser, by addition to the bath. For uniform particle distribution,
ultrasound irradiation is carried out. The particles are
surface-activated, before introduction. Plastic particles are treated
in this way, by plasma. Metallic particles or compounds are treated
chemically, for activation. They are activated by nano materials,
especially in fluid form. They are added selectively. Addition is
analogous to inkjet or screen printing methods. Particles with
magnetic characteristics are added. They are especially aligned
electromagnetically in the unhardened state of the resin. Two-shot
irradiations are carried out, the first shot being less intense than
the second. The object is recyclable by grinding, using a liquid
nitrogen treatment, followed by screening of resin and particles.
Record 56 of 64
DN: Database Name
METADEX
TI: Title
Retrospect and prospect of aluminium anodizing
AU: Author
Guo, H.-T.,--; Wang, W.,SO: Source
Materials Protection (China) (China). Vol. 33, no. 1, pp. 43-45. Jan.
2000
DE: Descriptors
Aluminum; Coating; Anodizing; Anodic coatings
AB: Abstract
The advances in the theory and application of aluminum anodizing in
the past of fifty years were briefly introduced. Emphases were made on
the utilization of the cellularity of anodic film. Drawing support
from the ordered micro-holes, with nano-magnitude, of the film, the
broad perspectives of preparation of new super-fine separating film
and multi-functional materials with proper optical, magnetical,
cathalytical and solar energy absorption properties were pointed out.
The anodic film could be reasonably expected as a new member of
nano-materials family.
Record 57 of 64
DN: Database Name
METADEX
TI: Title
Nano-scaled multi-layered bulk materials manufactured by repeated
pressing and rolling in the Cu-Fe system
AU: Author
Shingu, P H; Ishihara, K N; Otsuki, A; Daigo, I
SO: Source
Materials Science and Engineering A (Switzerland). Vol. 304-306, pp.
399-402. 31 May 2001
DE: Descriptors
Iron; Thin films; Copper; Multilayers; Mechanical properties;
Nanomaterials; Diamond pyramid hardness; Tensile strength; Yield
strength; Magnetoresistivity; Thermoelectricity; BIMETALS; COMPOSITES;
COPPER (PURE); IRON (PURE); IRON BASE MATERIALS;
MECHANICAL
PROPERTIES
AB: Abstract
The repeated application of mechanical deformation of metallic
materials has been proved to be an effective technique for producing
bulk nano-scaled regulated structures. These materials have been shown
to have unique properties characteristic for nano-materials. This
paper reports the experimental results on the mechanical strength,
magneto-resistivity, and thermo-electricity obtained by repeated
pressing and rolling of alternately stacked thin metallic foils in the
Cu-Fe system. In the samples which have the layer thickness greater
than 35 nm, the Hall-Petch relation is primarily obeyed. For the
samples with the layer thickness less than 35 nm, the strength and
hardness deviate from this relation. Large magneto-resistivity change
(GMR) have been confirmed and a noted change in thermo-electricity
(EMF) dependent on the layer thickness, as observed for the Ag-Fe
system, have also been confirmed.
Record 58 of 64
DN: Database Name
METADEX
TI: Title
HARDNESS;
Nano-scaled multilayered bulk materials manufactured by repeated
pressing and rolling in the Ag-Fe and Cu-Fe systems
AU: Author
Shingu, P H; Ishihara, K N; Otsuki, A; Hashimoto, M; Hasegawa, N;
Daigo, I; Huang, B
SO: Source
Materials Science Forum (Switzerland). Vol. 312-314, pp. 293-297.
1999
DE: Descriptors
Silver; Binary systems; Copper; Iron; Rolling; Nanomaterials;
Multilayers; Pressing; Magnetoresistivity; Processing effects;
Thermoelectricity; COPPER IRON ALLOYS; COPPER ALLOYS (40 TO 99.3 CU);
EXPERIMENTAL ALLOYS; HIGH COPPER ALLOYS; IRON ALLOYS (0 TO 5 FE);
LAMINATES; COMPOSITES
AB: Abstract
The repeated application of mechanical deformation of metallic
materials has been proved to be an effective technique for producing
bulk nano-scaled regulated structures. These materials have been shown
to have unique properties characteristic for nano-materials, such as
high mechanical strength, giant magneto-resistivity and
thermoelectricity. This paper reports further experimental results
obtained on bulk nano-scaled materials produced by repeated pressing
and rolling of alternately stacked thin metallic foils and of metallic
powder mixtures in the systems Ag-Fe and Cu-Fe. The physical
properties examined include giant-magneto-resistivity and
magneto-thermoelectric-power, measured both parallel and perpendicular
to the nano-scaled layers, and the tensile strength parallel to the
layers. These properties are checked as a function of the layer
thickness. The bulk nano-scaled multi-layered materials obtained by
the present work are unique in the sense that the physical properties
can be examined in the direction perpendicular to the layers.
Microstructural examination demonstrated that the present method can
generate almost the same nano-scaled layered structure by starting
from the thin foils or from the powder mixtures.
Record 59 of 64
DN: Database Name
METADEX
TI: Title
Structural characterization of ultra dispersed (nano-) materials as
intermediate between amorphous and crystalline states
AU: Author
Petrunin, V F
SO: Source
Nanostructured Materials (UK). Vol. 12, no. 5-8, pp. 1153-1156. July
1999
DE: Descriptors
Nickel; Microstructure; Gold; Dispersions; Nanomaterials; Amorphous
structure; Crystal structure; Interatomic distance; Computation;
Titanium nitride
AB: Abstract
Ultra dispersed materials (UDM) such as thin films, thin whiskers,
fine powders, nanocrystals (NCs) have been designed. Calculated values
of interatomic distances along various crystallographic directions are
found to essentially decrease at the centre of the particle and much
more reduced as the surface is approached. Similar changes of
interplanar distances corresponding to an inhomogeneous distortion in
UDM are confirmed experimentally, mainly by neutron diffraction.
Materials discussed include nickel, gold and TiN.
Record 60 of 64
DN: Database Name
METADEX
TI: Title
Investigation of structural relaxation by hydrogen absorption in
ball-milled alloys
AU: Author
Zaluski, L; Zaluska, A; Tessier, P; Strom-Olsen, J O; Schulz, R
SO: Source
Materials Science Forum (Switzerland). Vol. 225-227, no. 2, pp.
875-880. 1996
DE: Descriptors
Nanomaterials; Microstructure; Intermetallics; Ferrous alloys;
Titanium compounds; Iron compounds; Ball milling; Grain boundaries;
Deformation effects; Order disorder; Intergranular structure;
Amorphous structure; Absorptivity; Microstructural effects; Hydrogen;
Sorption; Absorption (material)
AB: Abstract
Hydrogen absorption is shown to be an excellent probe for studying
structure and relaxation of nanocrystalline materials prepared by
ball-milling. Grain boundaries in nanocrystalline FeTi have a highly
disordered (amorphous-like) character, in contrast to nano-materials
prepared by gas condensation methods. Effects of relaxation on
pressure-concentration isotherms are discussed in terms of
densification, strain reduction and chemical ordering in ball-milled
materials, both amorphous and nanocrystalline. These studies were
previously inaccessible, because of the need for activation (high
temperature annealing) preceding hydrogenation, which is now
eliminated by addition of a catalyst.
Record 61 of 64
DN: Database Name
METADEX
TI: Title
Recent advance on studies of continuous transformation in alloys
AU: Author
Wang, X T; Ren, X B; Wei, Y H
SO: Source
Xiyou Jinshu Cailiao yu Gongcheng (Rare Metal Materials and
Engineering) (People's Republic of China). Vol. 24, no. 3, pp. 1-11.
June 1995
DE: Descriptors
Solid solutions; Phase transformations; Spinodal decomposition; Order
disorder; Clustering; Precipitation; Free energy; Design
AB: Abstract
Over the past two decades, a unified view of spinodal decomposition
and continuous ordering processes has evolved, and this generalized
perspective has substantially clarified the nature of order-disorder
reactions in alloys, and the interplay of ordering and clustering in
precipitation systems. The concept of concentration waves and the
reciprocal lattice approach provide the foundation of this modern view
of continuous phase transformations. Herein, these concepts are
combined with free energy-composition and phase diagrams to survey
systematically and interpret the continuous transformation occurring
in metallic solid solution. Finally, the coexistance of phase
decomposition and ordering in alloys has been discussed, and a new
ideas to produce "natural nano-materials" is provided, where applying
the continuous transformations to the alloys investigated and the
guidelines of the composition design and technologies of heat
treatment for obtaining natural nano-materials are discussed.
Record 62 of 64
DN: Database Name
METADEX
TI: Title
Dynamic Magnetic Consolidation (DMC) Process for Powder Consolidation
of Advanced Materials
AU: Author
Chelluri, B
SO: Source
Mater. Manuf. Process. Vol. 9, no. 6, pp. 1127-1142. 1994
DE: Descriptors
Compacting; Nickel base alloys; Powder metallurgy; Nickel molybdenum
steels; Tungsten steels; COMPOSITE POWDER; CONSOLIDATION; DYNAMIC
MAGNETIC CONSOLIDATION; ENGINEERING CERAMIC; INTERMETALLIC
COMPOUND;
NET-SHAPE FORMING; POWDER; POWDER COMPACTION; POWDER PROCESSING;
PROCESSING; RAPID PROCESS; TECHNICAL; ADVANCED MATERIAL
AB: Abstract
This paper describes a novel rapid consolidation technique called
Dynamic Magnetic Compaction (DMC) for consolidating advanced material
powders. DMC utilises pressures generated from pulsed electromagnetic
fields to form net shape parts. The consolidation occurs rapidly in
less than a millisecond via pressure wave propagation through the
powders. Powders of different materials such as intermetallics,
refractory alloys, ceramics, nano materials and composites can be
fabricated into full density parts using DMC. The principles and
benefits of the DMC technique for advanced material fabrication along
with a summary of feasibility result on tungsten steel composites will
be described. 2 refs.
Record 63 of 64
DN: Database Name
METADEX
TI: Title
High Resolution Electron Microscopy of Nano-Material Interfaces
AU: Author
Ishida, Y; Ichinose, H
SO: Source
Annu. Rep. Eng. Res. Inst. Fac. Eng. Univ. Tokyo. Vol. 52, pp.
115-119. Sept. 1993
DE: Descriptors
Silver; Composite materials; Oxides; Particulate composites;
Microstructure; Grain boundaries; Electron microscopy; Interfaces
AB: Abstract
Metallic, oxide and metal-oxide composite nano-materials (Ag--MgO,
Ag--WO sub 3 , Ag--Bi sub 2 Sr sub 2 Ca sub 2 Cu sub 3 O sub x ) were
produced and their properties were investigated in connection with
structural features mainly by high resolution electron microscopy. The
observed metallic grain boundaries were not disordered in atomic
arrangement. Short period CSL boundaries frequently appeared. Long
period boundaries were rarely observed. A void was frequently observed
at the grain boundary triple point. Shape of the void was round.
Structural relaxation at room temperature was detected by positron
life time measurement. It is suggested that the low density of the
metallic nano-material is attributed not to the low density grain
boundary region but to existing voids. High chemical activity of metal
ceramic interface of Bi sub 2 Sr sub 2 Ca sub 2 Cu sub 3 O sub x --Ag
composite nano-material was expected to give excellent measured
properties such as high Jc and high plasticity.
Record 64 of 64
DN: Database Name
METADEX
TI: Title
High resolution electron microscopy of interfaces in nano-materials
AU: Author
Kizuka, T; Ishida, Y; Xu, B S; Ichinose, H
SO: Source
Ann. Chim , Sci. Mater. (France). Vol. 18, no. 5-6, pp. 415-421. 1993
DE: Descriptors
Silver; Powder technology; Ultrafines; Synthesis; Powder compacts;
Microstructure; Titanium dioxide; Magnesium oxide
AB: Abstract
Metallic, oxide and metal-oxide composite nano-materials were produced
and their properties were investigated in connection with structural
features mainly by high resolution electron microscopy. The observed
metallic grain boundaries were not disordered in atomic arrangement.
Short period CSL boundaries frequently appeared. Long period
boundaries were rarely observed. A void was frequently observed at the
grain boundary triple point. Shape of the void was round. Structural
relaxation at room temperature was detected by positron life time
measurement. It is suggested that the low density of the metallic
nano-material is attributed not to the low density grain boundary
region but to existing voids. High chemical activity of metal ceramic
interface of Bi sub 2 Sr sub 2 Ca sub 2 Cu sub 3 O sub x -Ag composite
nano-material was expected to give excellent measured properties such
a high Jc and high plasticity.