Supplementary document:
Synthesis, characterization and properties of flexible magnetic nanocomposites of CoFe2O4polybenzoxazine- LLDPE
Amit B. Rajput, Seikh J. Rahaman ,Gautam Sarkhel, Manoj K. Patra, Sampat R. Vadera, Pravin
M. Singru, Yusuf Yagci and Narendra N. Ghosh*
Preparation of CoFe2O4 nanoparticle
Co(NO3)2 6H2O (99.9%), Fe(NO3)3 9H2O (99.9%) and EDTA (99.9%) were purchased from
Merck, India and used without further purification. Stoichiometric amounts of cobalt nitrate and
ferric nitrate were dissolved in distilled water according to the molar ratio of 1: 2. An aqueous
solution of EDTA was prepared by dissolving EDTA in hot water with drop-wise addition of
NH4OH. After complete dissolution of EDTA, the solution was boiled to remove the excess
NH3. The pH of the solution was found to be 6. Aqueous solutions of metal nitrates and EDTA
were mixed in a molar ratio of 1 : 1 and stirred for 1 h at room temperature using a magnetic
stirrer. The pH of the resultingmixture was 2. Black-coloured precursor was formed when this
reaction mixture was evaporated to dryness on a hot plate at 110 0C. During drying, slight
decomposition of the precursor was observed.
In this study, three to four drops of 10% NH4NO3 aqueous solution were added to the dried
precursor powder and then precursor powders calcined in air for 2–4 h at 550 0C to obtain cobalt
ferrite nanopowder. NH4NO3 was added to facilitate the oxidation of carbonaceous mass of the
precursor.
Figure 1: TEM micrograph of synthesized CoFe2O4 nanopowder
Figure 2: Particle size distribution of synthesized CoFe2O4 nanopowder obtained from dynamic
light scattering study using a particle size analyzer. Average particle size was found to be ~ 18
nm.
Reference:
Rajput,
A.
B.;
Hazra,
S.;
Ghosh,
DOI:10.1080/17458080.2011.582170 (available online)
N.
N.
J
Exp
Nanosci.
2012,