PREPARATION AND CHARACTERIZATION OF IRON OXIDE NANOPARTICLES ON DISACCHARIDE TEMPLATES
We report here the preparation of nanoparticles of iron oxide in the presence of polysaccharide
templates. Interaction between iron sulfate and template has been carried out in aqueous phase,
followed by the selective and controlled removal of the template to achieve narrow distribution of
particle size. Particles of iron oxide obtained have been characterized for their stability in solvent
media, size, size distribution and crystallinity and it was found that when the negative value of the
zeta potential increases, particle size decreases. A narrow particle size distribution with D100 = 275
nm was obtained with chitosan and starch templates. SEM measurements further confirm the particle
size measurement. Diffuse reflectance UV–VIS spectra values show that the template is completely
removed from the final iron oxide particles and powder XRD measurements show that the peaks of
the diffractogram are in agreement with the theoretical data of hematite. The salient observations of
our study shows that there occurs a direct correlation between zeta potential, polydispersity index,
band gap energy and particle size. The crystallite size of the particles was found to be 30–35 nm. A
large negative zeta potential was found to be advantageous for achieving lower particle sizes, as the
particles remained discrete without agglomeration.
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