What is Nanotechnology
• Nanotechnology is the exploitation of the
ability to control matter at dimensions
between 0.1 and 100 nm, resulting in
unique functionalities
Scale of Things
10-10 m
0.1 nm
10-9 m
10-8 m
10-7 m
1 nanometer (nm)
0.01 mm
10 nm
0.1 mm
100 nm
10-6 m
1,000 nanometers =
1 micrometer (mm)
10-4 m
0.01 mm
10 mm
10-3 m
10-2 m
0.1 mm 1,000,000 nanometers = 1 cm
10 mm
100 mm
1 millimeter (mm)
Human hair
~ 60-120 mm wide
Ant
~ 5 mm
DNA
~2-1/2 nm diameter
Atoms of silicon
spacing 0.078 nm
Red blood cells
(~7-8 mm)
ATP synthase
~10 nm diameter
Fly ash
~ 10-20 mm
Dust mite
200 mm
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Organic-Inorganic Nanocomposite
Materials
Properties of Organic & Inorganic Material
Two Influencing Factors
1.The interface between the organic
& inorganic phase
2.Domain sizes of these two phases
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Sol-Gel Technology
The main idea of the sol-gel process is the
spontaneous formation of a dual phase material (gel),
prepared from the solution (sol), containing inorganic
precursors ( 前 驅 物 ) and stabilizing agents with
hydrolysis(水解) & condensation(縮合) reaction. Further
transformation of the gel phase is driven by the
evaporation of the solvent, and the subsequent
formation of the xerogel phase.(熟化aging). Drying of
the xerogel completely removes solvent molecules,
leading to further aggregation of inorganic clusters and
the formation of solid materials.
Hydrolysis Reaction
Condensation Reaction
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Sol-Gel Technology (cont’d)
• Control Parameters
– Precursors
– Concentration of Metal Salts
– Temperature
– Catalysts
– pH
Hydrolysis & Condensation
• Advantages
– Low temperature route (below 200oC)
– Uniform particle size distribution
– Provides good homogeneity
– Concentration of metals in the coatings can be controlled with
ease
– Chemical purity of nanocomposites
• Drawbacks
– high cost for the majority of alkoxide precursors
– long processing times
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Applications
Anti-Abrasion
Anti-Rusting
Hydrophobic
Anti-Glare
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Nano Hybrid Material
• PEACCO NON-CHROMATE
PLASTICAL/ METAL SURFACE
TREATMENT SOLUTIONS
– Nanocomposites
• The hybrid from inorganic nanodispersion metal and organic epoxy .
– Sol-Gel Method
• uses an aqueous solution to apply on
the metal to form a organic-inorganic
hybrid thin film.
– Traditional Coating Method
• This coating can be applied on the
metal by many techniques like dip,
spin, spray, or roller coatings.
– Strong chemical bonding
• This organic-inorganic hybrid coating
can chemically bond to the metal and
can also chemically bond to organic
adhesives/paints.
– Apply on Various Metals and Plastics
• By modifying the composition of the
coating solution, this technology can
apply on different kinds of metals and
plastics.
Strong chemical bonding
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