Cobalt ferrite nanoparticles have been synthesized by co-precipitation method using three different precipitating agents, viz. ammonium hydroxide, sodium hydroxide and monoethanolamine. The average particle size of the nanoparticles varied in the range 17-70 nm by varying the precipitating agents. The phase formation of the synthesized nanoparticles was performed via X-ray diffraction. Fourier infrared spectroscopy also confirmed the product formation. The microstructure and elemental composition were characterized by scanning electron microscopy and energy dispersive X-ray spectroscopy respectively. The precipitating agents were varied to vary the size and to study the effect of size on the morphology and antibacterial properties. The effect of precipitating agents and particle size on the antibacterial activity was carried out against the microorganism Staphylococcus aureus (gram positive bacteria) quantitatively by spread plate method. © 2015 Indian Ceramic Society.

Sumathi S

Department of Chemistry

School of Advanced Sciences

Vellore Campus

Nehru M

Vidya R.

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Synthesis, Characterization and Effect of Precipitating Agent on the Antibacterial Properties of Cobalt Ferrite Nanoparticles

Transactions of the Indian Ceramic Society

CoFe2O4 and CoFe1.9Bi0.1O4 nanoparticles are prepared by combustion method utilizing glycine. Pure phase formation is affirmed from the X-ray diffraction and Fourier transform infrared spectroscopy. From the Scanning electron microscopy and Energy Dispersive X-ray spectroscopy, morphology and presence of respective elements in the synthesized compounds are analyzed. Decrease in average crystallite size and increase in lattice parameter is observed due to bismuth substitution. The adsorption capability of CoFe2O4 and CoFe1.9Bi0.1O4 are tested for one of the toxic environmental pollutants chromium (VI). The adsorption efficiency with respect to adsorbent quantity, concentrations of adsorbate and pH are studied. The substitution of the bismuth increased the adsorption capability of cobalt ferrite nanoparticles. © Published under licence by IOP Publishing Ltd.

Fulltext

IOP Conference Series: Materials Science and Engineering

Adsorption of chromium (VI) on bismuth incorporated cobalt ferrite nanoparticles

Cobalt-doped iron oxide nanoparticles were prepared by solution combustion technique. The structural and magnetic properties of the prepared samples were also investigated. The average crystallite size of cobalt ferrite (CoFe2 O4) magnetic nanoparticle was calculated using Scherrer equation, and it was found to be 16±5 nm. The particle size was measured by transmission electron microscope. This value was found to match with the crystallite size calculated by Scherrer equation corresponding to the prominent intensity peak (311) of X-ray diffraction. The high-resolution transmission electron microscope image shows clear lattice fringes and high crystallinity of cobalt ferrite magnetic nanoparticles. The synthesized magnetic nanoparticles exhibited the saturation magnetization value of 47 emu/g and coercivity of 947 Oe. The anti-microbial activity of cobalt ferrite nanoparticles showed better results as an anti-bacterial agent. The affinity constant was determined for the nanoparticles, and the cytotoxicity studies were conducted for the cobalt ferrite nanoparticles at different concentrations and the results are discussed. © 2015 Venkatesan et al.

International Journal of Nanomedicine

Structural and magnetic properties of cobalt-doped iron oxide nanoparticles prepared by solution combustion method for biomedical applications

Aliovalent ion substituted hydroxyapatite of formulae BiNaCa3(PO4)3OH, Bi0.5M0.5Ca4(PO4)3OH (M&nbsp;=&nbsp;K, Ag) were synthesized and characterized. Antimicrobial properties of these synthesized materials were studied quantitatively by spread plate method against the microorganisms Escherichia coli (gram negative bacteria), Staphylococcus aureus (gram positive bacteria) and Candida albicans (yeast). Among the substituted hydroxyapatite compounds bismuth and silver substituted compound of formula Bi0.5Ag0.5Ca4(PO4)3OH shown excellent activity against all the three organisms. Cytotoxicity study was carried out against mouse fibroblast NIH-3T3 cell line in two different concentrations 10&nbsp;μg/mL and 20&nbsp;μg/mL by MTT assay method.

Applied Surface Science

Antimicrobial and cytotoxicity evaluation of aliovalent substituted hydroxyapatite

Acta Biomaterialia

Transition metal-substituted cobalt ferrite nanoparticles for biomedical applications

Physica Scripta

Effect of neodymium substitution on structural and magnetic properties of magnesium ferrite nanoparticles

Antimicrobial activity of metal oxide nanoparticles against Gram-positive and Gram-negative bacteria: a comparative study

Materials Research Bulletin

Study on the formation of CoxFe3−xO4 system using two low temperature synthesis methods

Journal	Transactions of the Indian Ceramic Society
Publisher	Informa UK Limited
ISSN	0371-750X
Open Access	0