K. Venkatesan

Bio: K. Venkatesan is an academic researcher. The author has contributed to research in topics: Combustion & Energy-dispersive X-ray spectroscopy. The author has an hindex of 1, co-authored 4 publications receiving 7 citations.

Preparation and Characterization of Zinc Ferrite (ZnFe2O4) Nanoparticles Using Self-Propagated Combustion Route and Evaluation of Antimicrobial Activity.

Abstract: The zinc ferrite nanoparticles were prepared by using self-propagated solution combustion route. The metal nitrates were used as an oxidizer and amino acids were used as the fuels to control the combustion reaction. In combustion reaction by changing the fuel, single phase of zinc ferrite was achieved. The X-ray diffraction pattern confirmed the single phase of zinc ferrite and it has found that the X-ray diffraction pattern matched very well with JCPDS data (# card number – 01 082 1049). The prepared zinc ferrite nanoparticles were investigated by X-ray diffraction technique (XRD) and field-emission scanning electron microscope (FE-SEM). Anti-bacterial activity of zinc ferrite nanoparticles was carried by well diffusion technique. The anti-bacterial assay was done against the bacillus subtilis (gram positive) and klebsiella, salmonella (gram negative) bacteria. The single phase of prepared ZnFe2O4 nanoparticles showed better anti-bacterial activity compared with mixed phase. The zone width increased, when the concentration of ZnFe2O4 nanoparticles was increased.

Influence of fuel on phase formation of ZnFe2O4 prepared by self-propagated combustion route

Abstract: Zinc iron oxide (ZnFe2O4) nanoparticles were prepared by self-propagated combustion route.The fuel plays a major role on the formation of structure and particle size. Here three different fuels like alanine, glycine and proline were used to synthesis the zinc iron oxide nanoparticle. Influence of combustion nature through the fuel, the phase formation, particle size, band gap and surface morphology has been modified. The prepared powder was characterized by powder X-ray diffraction method (PXRD), field-emission scanning electron microscopy (FE-SEM) and the composition of the material was analysed by X-ray energy dispersive spectroscopy (EDAX).The elemental mapping was confirmed the uniform distribution of Zn, Fe and O elements in the prepared material of ZnFe2O4.

Influence of Cr3+ ions on CoFe2O4 nanoparticles to increase the magnetic behaviour by exchange anisotropy

Abstract: Chromium substituted cobalt ferrite (CoFe2-xCrxO4) nanoparticles were prepared by smouldering combustion route. Substitution of Chromium ions plays a major role on particle size, surface morphology and magnetic behaviour of CoFe2O4 nanoparticles. The prepared material of chromium substituted cobalt ferrite nanoparticles were characterized by powder XRD, Raman, FE-SEM and VSM.

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

Abstract: 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 (CoFe2O4) 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.

Synthesis and characterization of cobalt ferrites nanoparticles with cytotoxic and antimicrobial properties

Abstract: Recently, the application of nanotechnology in food sector and the agriculture attract the attention compared to its biomedical application. The aims of the current study were to synthesize and characterize cobalt ferrites nanoparticles [(CoFe2O4) NPs] by combustion method employing glycine as fuels and to evaluate their antimicrobial against pathogenic bacteria and fungi and anti cancer properties against MCF-7 breast cancer cells line. The results indicated that the particles size of the synthesized (CoFe2O4) NPs was 40 nm. These (CoFe2O4) NPs showed potential antibacterial properties against Gram-negative bacteria (Escherichia coli, Salmonella typhi) and Gram-positive bacteria (Staphylococcus aureus, Bacillus cereus) as well as the pathogenic fungi (Aspergillus flavus and Aspergillus ochraceus) in a dose dependent manner with maximum concentration of 1.8 mg/ml. (CoFe2O4) NPs also showed weak antiradical but have cytotoxic effects against MCF-7 breast cancer cells line and succeeded to decrease the cell viability at a concentration of 2 mg/ml. it could be concluded that (CoFe2O4) NPs is a promise candidate as antimicrobial and anticancer agent for food sector and medical application.

Characterization and Applications of the Biosynthesized Silver Nanoparticles by Marine Pseudomonas sp. H64

Abstract: Nanoparticles have become important scopes of research. The present study made insight into the using of marine bacteria as a new ecofriendly and low cost source for biosynthesis of silver nanoparticles. Fifteen marine bacteria were tested for their capabilities to synthesize silver nanoparticles. Characterization of silver nanoparticles synthesized by the most promising Pseudomonas sp. H64 was performed using UV–Visible spectrophotometer, Fourier transform-infrared spectroscopy, zeta potential, transmission electron microscopy and X-ray. The produced Ag NPs are spherical particles with size of 3-22 nm and negative charge (-14 mV). Different valuable applications of the biosynthesized AgNPs were investigated. The produced AgNPs exhibited promising antibacterial activity against human and fish pathogens (Vibrio parahaemolyticus, Aeromonas hydrophila, Escherichia coli, Streptococcus faecalis, Staphylococcus aureus, Bacillus subtilis) with inhibition zone diameters (10-37 mm). Moreover, antifungal activity against (Fusarium solani, Rhizoctonia solani; Rhizopus oryzae, Helminthosporium sp.) expressed as inhibition of growth was (77.8±0.68-100%), while no antifungal activity was detected against Aspergillus niger. Antifouling and antioxidant activities were also confirmed. AgNPs exhibited anticancer activity toward (HepG-2, MCF-7, CaCo-2) cell lines. Moreover, AgNPs exhibited bioremediation potential of heavy metals and dyes.