Browsing by Author "Bhoopathi G"

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EFFECT OF BIOPOLYMER BLEND MATRIX ON STRUCTURAL, OPTICAL AND BIOLOGICAL PROPERTIES OF CHITOSAN–AGAR BLEND ZNO NANOCOMPOSITES
(Springer, 2018-07-01) Magesh G; Bhoopathi G; Nithya N; Arun A P; Ranjith Kumar E
The present research is focused on the development of ecofriendly biopolymer blend based nanocomposites to enhance the effect of cytotoxic activity. Novel eco-friendly synthesis of pure Chitosan–Agar blend and Chitosan–Agar/ZnO nanocomposites was successfully synthesized by in-situ chemical synthesis method. The influence of Chitosan–Agar (1:1 wt/wt %) concentrations (0.1, 0.5, 1 and 3 g) was studied. The presence of ZnO nanoparticles in Chitosan–Agar polymer matrix was confirmed by UV, FTIR, XRD, FESEM, EDAX and TEM. The crystallite size of the nanocomposites in the range of 12–17 nm is observed from XRD analysis. PL and UV reveal that Nanocomposites shows an blue shift by increase in the blend concentrations. TEM analysis shows that 0.1 and 3 g of Chitosan–Agar/ZnO Nanocomposites are in spindle and spherical shape with polycrystalline nature. The prepared Nanocomposites shows the respectable Antibacterial activity against Gram-positive (Staphylococcus aureus and Bacillus subtilis) and Gram-negative (Pseudomonas aureginosa and Klebsilla pneumonia) bacteria. The potential toxicity of Chitosan–Agar/ZnO nanocomposites was studied for normal (L929) and breast cancer cell line (MB231). The result of this investigation shows that the Chitosan–Agar/ZnO nanocomposites deliver a dose dependent toxicity in normal and cancer cell line.
EFFECT OF BIOPOLYMER BLEND MATRIX ON STRUCTURAL, OPTICAL AND BIOLOGICAL PROPERTIES OF CHITOSAN–AGAR BLEND ZNO NANOCOMPOSITES
(Springer US, 2018-01-07) Magesh G; Bhoopathi G; Nithya N; Arun A P; Ranjith Kumar E
The present research is focused on the development of ecofriendly biopolymer blend based nanocomposites to enhance the effect of cytotoxic activity. Novel eco-friendly synthesis of pure Chitosan–Agar blend and Chitosan–Agar/ZnO nanocomposites was successfully synthesized by in-situ chemical synthesis method. The influence of Chitosan–Agar (1:1 wt/wt%) concentrations (0.1, 0.5, 1 and 3 g) was studied. The presence of ZnO nanoparticles in Chitosan–Agar polymer matrix was confirmed by UV, FTIR, XRD, FESEM, EDAX and TEM. The crystallite size of the nanocomposites in the range of 12–17 nm is observed from XRD analysis. PL and UV reveal that Nanocomposites shows an blue shift by increase in the blend concentrations. TEM analysis shows that 0.1 and 3 g of Chitosan–Agar/ZnO Nanocomposites are in spindle and spherical shape with polycrystalline nature. The prepared Nanocomposites shows the respectable Antibacterial activity against Gram-positive (Staphylococcus aureus and Bacillus subtilis) and Gram-negative (Pseudomonas aureginosa and Klebsilla pneumonia) bacteria. The potential toxicity of Chitosan–Agar/ZnO nanocomposites was studied for normal (L929) and breast cancer cell line (MB231). The result of this investigation shows that the Chitosan–Agar/ZnO nanocomposites deliver a dose dependent toxicity in normal and cancer cell line.
NEODYMIUM DOPED TIO2 NANOPARTICLES BY SOL-GEL METHOD FOR ANTIBACTERIAL AND PHOTOCATALYTIC ACTIVITY
(Elsevier, 2018-08-15) Nithya N; Bhoopathi G; Magesh G; Daniel Nesa Kumar C
In the present study, TiO2 and Nd doped TiO2 nanoparticle was synthesized through Sol-gel method with different molar ratio and different starting material. The synthesized nanoparticle was characterized by XRD, UV-Vis, PL, FE-SEM, HR-TEM, and EDS analysis. The X-ray diffraction pattern confirms tetragonal anatase phase with average crystallite size of 14–10 nm. The influence of phase transition was identified by the addition of dopant Nd. The calculated band gap is in the range of 3.48–3.44 eV. Near UV and blue emission in PL spectrum indicate the presence of crystal defects in TiO2 lattice. The structural morphology of the prepared sample was analyzed by FESEM. The average particle size of the sample was determined by TEM analysis. The elemental compositions and incorporation of Nd ions into the TiO2 nanoparticles was detected by using energy dispersive spectra analysis. The antibacterial activity of pure TiO2 and Nd doped TiO2 nanoparticle was tested for different bacterial organisms like Escherichia coli (Gram-negative) and staphylococcus aureas (Gram-positive) bacteria. The photo catalytic activity of the prepared samples on degradation of Methylene Blue and Congo Red under ultraviolet irradiation were also studied.
STRUCTURAL AND OPTICAL CHARACTERIZATION OF PURE AND STARCH-CAPPED ZNO QUANTUM DOTS AND THEIR PHOTOCATALYTIC ACTIVITY
(Springer Berlin Heidelberg, 2015-02) Vidhya K; Saravanan M; Bhoopathi G; Devarajan VP; Subanya S
Among the different types of metal oxides, zinc oxide (ZnO) is a most commonly used metal oxide in a broad variety of applications. In the present investigation, a modified green synthesis route was used to synthesize pure and starch-capped ZnO (ZnO/starch) quantum dots (QDs) and studied their structural and optical characteristics. In this study, hexagonal crystal structure was observed in both pure and ZnO/starch QDs using X-ray diffraction technique. A spherical-shaped surface morphology was found with the size of 5–10 nm using transmission electron microscope technique. The interaction between ZnO QDs and starch molecules was proved via Fourier infra-red spectrometer technique. On the other hand, their fluorescence behaviors were investigated using photoluminescence technique, in that the ZnO/starch QDs showed an
STRUCTURAL, MORPHOLOGICAL, OPTICAL AND BIOLOGICAL PROPERTIES OF PURE ZNO AND AGAR/ZINC OXIDE NANOCOMPOSITES
(Elsevier, 2018-10-01) Magesh G; Bhoopathi G; Nithya N; Arun A P; Ranjith Kumar E
In this work, ZnO nanoparticles were prepared by in situ chemical precipitation method in the presence of Agar biopolymer. The influences of Agar concentrations on the structural, morphological and optical properties of ZnO have been investigated. The XRD pattern of Pure ZnO and Agar/ZnO nanocomposites indicates the hexagonal wurtzite phase of ZnO. The crystallite size of pure ZnO and Agar/ZnO nanocomposites was found to be in the range of 35.5 to 19.73 nm. Pure ZnO and Agar/ZnO nanocomposites showed nanospheroid and nanopaddy shaped morphology from FESEM studies. The interplanar distance observed from the HRTEM image confirms the plane of the prepared material. The elemental compositions of the samples were characterized by EDX. The optical properties of Pure ZnO and Agar/ZnO nanocomposites were characterized by UV, FTIR and PL. The band gap of Agar/ZnO nanocomposites were varied with the Agar concentration. Oxygen vacancy induced photoluminescence of ZnO are observed and its intensity is found to be increased linearly with the Agar concentration. The antibacterial activity of ZnO and Agar/ZnO nanocomposites was evaluated by disc diffusion method against Gram-positive (B.subtilis) and Gram-negative (P. aeruginosa) bacteria. The cytotoxicity of Agar/ZnO nanocomposites was studied against Normal (L929) and Breast cancer cell line (MB231). The result of this investigation reveals that the Agar/ZnO nanocomposites deliver a dose dependent toxicity in normal and cancer cell line.
SYNTHESIS AND CHARACTERIZATION OF YTTRIUM DOPED TITANIA NANOPARTICLES FOR GAS SENSING ACTIVITY
(Elsevier, 2018-08-15) Nithya N; Bhoopathi G; Magesh G; Balasundaram O N
The current work emphasis on the synthesis, characterization and the gas sensing activity of titania nanoparticles and yttrium (Y) doped titania nanoparticles. The structural, morphological and optical properties of titania nanoparticles and Y doped titania nanoparticles were studied by XRD, UV, PL, FTIR, FESEM, EDAX and TEM analysis. The XRD analysis showed that the titania nanoparticles contains tetragonal anatase phase, Y doped titania nanoparticles with various molar concentrations (0.5 mM, 1 mM, 1.5 mM and 2 mM) consists of three different phases. The average crystallite size was found to be 13 - 11 nm. The bandgap energy of titania nanoparticles and Y doped titania nanoparticles were found in the range 3.56–3.52 eV. The blue and green emission peaks were formed in the photoluminescence spectra. The grain size and surface morphology of the samples were analysed by FESEM and TEM-SAED analysis. The elemental compositions of the prepared samples were detected by EDAX. The effect of yttrium concentrations on titania nanoparticles were studied for ethanol gas with short response, recovery time and long-term stability.
SYNTHESIS AND CHARACTERIZATION OF YTTRIUM DOPED TITANIA NANOPARTICLES FOR GAS SENSING ACTIVITY
(Elsevier, 2019-08-15) Nithya N; Bhoopathi G; Magesh G; Balasundaram O N
The current work emphasis on the synthesis, characterization and the gas sensing activity of titania nanoparticles and yttrium (Y) doped titania nanoparticles. The structural, morphological and optical properties of titania nanoparticles and Y doped titania nanoparticles were studied by XRD, UV, PL, FTIR, FESEM, EDAX and TEM analysis. The XRD analysis showed that the titania nanoparticles contains tetragonal anatase phase, Y doped titania nanoparticles with various molar concentrations (0.5 mM, 1 mM, 1.5 mM and 2 mM) consists of three different phases. The average crystallite size was found to be 13 - 11 nm. The bandgap energy of titania nanoparticles and Y doped titania nanoparticles were found in the range 3.56–3.52 eV. The blue and green emission peaks were formed in the photoluminescence spectra. The grain size and surface morphology of the samples were analysed by FESEM and TEM-SAED analysis. The elemental compositions of the prepared samples were detected by EDAX. The effect of yttrium concentrations on titania nanoparticles were studied for ethanol gas with short response, recovery time and long-term stability.
TUNING EFFECT OF POLYSACCHARIDE CHITOSAN ON STRUCTURAL, MORPHOLOGICAL, OPTICAL AND PHOTOLUMINESCENCE PROPERTIES OF ZNO NANOPARTICLES
(Elsevier, 2018-01-05) Magesh G; Bhoopathi G; Nithya N; Arun A P; Ranjith Kumar E
Chitosan/ZnO nanocomposites was synthesized by in-situ chemical precipitation method. The effect of polysaccharide Chitosan concentration (0.1 g, 0.5 g, 1 g and 3 g) was investigated by X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM) with Energy dispersive spectroscopy (EDX), High Resolution Transmission Electron Microscopy (HRTEM), UV–visible (UV), Fourier Transform Infrared (FTIR) and Photoluminescence Spectroscopy (PL). XRD pattern confirms the hexagonal wurtzite structure of the Chitosan/ZnO nanocomposites. The structural morphology and the elemental composition of the samples were analysed by FESEM and EDX respectively. From TEM analysis, it is observed that the particles in spindle shape morphology with average particle size ranges 10–20 nm. UV–Vis analysis reveals that the Chitosan concentrations affect the absorption band edge and shift towards lower wavelength. The oxygen vacancy induced photoluminescence of ZnO nanoparticles was observed and its intensity decreases by tuning the Chitosan concentration.