Browsing by Author "Chandarshekar B"

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    CHARACTERISATION AND EVALUATION OF ANTIBACTERIAL EFFECT OF SILVER NANOPARTICLES
    (PSG College of Technology, Coimbatore, 2015-08-07) Sharmila C; Chandarshekar B; Ranjith R
    Silver nanoparticles have attracted much attention in recent years. At low concentration these silver nanoparticles are non-toxic in nature and have a broad spectrum of antibacterial actions. Many methods are being investigated for the efficient production of silver nanoparticles among which green synthesis process using plant extract showed more successive rate. Employing plants towards the synthesis of nanoparticles are more advantageous because these plants can act as capping and reducing agent and hence increase the rate of reduction and stabilization of nanoparticles. In this present study silver nanoparticles were synthesized by silver nitrate solution dissolved in distilled water with guava leaves as reducing agent. The biosynthesized nanoparticles were characterized with different characterization techniques. The presence of silver nanoparticles was confirmed by UV-VIS, XRD, FTIR and SEM spectroscopic techniques. Antibacterial activity study was also carried out for the biosynthesized silver nanoparticles.
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    SILVER NANOPARTICLES- BIOCOMPATIBILITY AND ANTIBACTERIAL ACTIVITY
    (VIT, Vellore, 2018-10-11) LincyPriyangaa A; Chandarshekar B; Sharmila C
    Silver nanoparticle has attracted much attention in recent years. At low concentration these silver nanoparticles are non-toxic in nature and have a broad spectrum of antibacterial actions. Silver nanoparticles were synthesized by wet chemical synthesis using silver nitrate as a reducing agent. The synthesized silver nanoparticles were then encapsulated with biopolymers like dextran sulphate and chitosan. The biopolymer encapsulated silver nanoparticles were then characterized with different characterization techniques. The presence of silver nanoparticles was confirmed by UV-VIS, XRD, FTIR and SEM spectroscopic techniques. The biocompatibility and the antibacterial activity of synthesized biopolymer encapsulated silver nanoparticles were analysed.
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    SIZE CONTROLLED SYNTHESIS OF DEXTRAN SULFATE STABILIZED SILVER NANOPARTICLES
    (National institute of Technology, Trichy, 2017-02-27) Sharmila C; Prabhavathi V; Chandarshekar B
    In the generation of nanoparticles for biological applications, the control over synthetic parameters influencing the particles' physicochemical properties are of great interest due to the strong influence of particle size and surface properties on cellular uptake and bio-distribution. Size controlled Dextran sulphate stabilized silver nanoparticles (AgNPs - DS) were synthesized from aqueous solution of silver nitrate (AgNO3) and dextran sulphate sodium salt (DS). The characterization of AgNPs - DS was performed by Ultraviolet–Visible spectroscopy (UV-VIS), Travelling Electron Microscope (TEM), Energy Dispersive X-ray spectroscopy (EDX), X-ray Diffraction (XRD), Fourier Transform Infrared spectroscopy (FTIR) and the antimicrobial activity of the synthesized nanoparticles were also performed. The formation of AgNPs - DS was monitored by colour changes of the reaction mixture from yellowish to brown and by measuring the surface plasmon resonance absorption peak in UV-VIS spectra. The TEM analysis was used to determine the size and shape of AgNPs - DS. The presence of elemental silver and its crystalline structure in AgNPs - DS were confirmed by EDX and XRD analyses. The possible functional groups of DS responsible for the reduction and stabilization of AgNPs were determined by FTIR spectroscopy.
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    SYNTHESIS AND CHARACTERISATION OF AG-ZNO NANOCOMPOSITES
    (PSGR Krishnammal College for Women, Coimbatore, 2019-01-20) Sharmila C; Selvi C; Chandarshekar B
    In recent years to improve the opto-electronic properties of metal oxides, metal nanoparticles are used as nanocomposites. Ag-ZnO nanocomposites were synthesized by wet chemical synthesis. Many studies have found that the presence of Ag nanoparticles is beneficial to improve Ultra violet emission of Zinc oxide. The SEM micrograph image reveals spherical shape nanocomposites with uniform distribution of grain size. The EDAX spectrum confirms the presence of Ag, Zn and O elements dispersed energy corresponding to 1.7keV, 2.1keV, 13.3keV respectively. The UV-Visible spectrum exhibits the single and well defined absorption band at 350 nm. Photoluminescence spectra exhibit UV emission at 378 nm and green emission at 555 nm. The band gap diagram of the possible emission mechanism was discussed. The doping of Ag into ZnO enhances the photocatalytic activity which results to be a promising material for green emissive optical devices.
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    SYNTHESIS AND CHARACTERIZATION OF AG-DS BIOPOLYMER COMPOSITES
    (Anna University Chennai, 2019-01-03) Sharmila C; Dinesh M; Chandarshekar B
    Chitosan (CS) biopolymer was added with low loading silver (Ag) metal nanoparticles to form Ag-CS biopolymer composite. Chitosan is a very promising biopolymer because it is environmental friendly due to its biodegradability and is degraded by enzymes in human body without any toxic effect. The major concern of the study focuses on the synthesis and characterization of the biopolymer composite. Different characterization techniques like X-ray Diffraction Analysis (XRD), Fourier Transform Infrared Spectroscopic analysis (FTIR), Scanning Electron Microscopy (SEM) along with Energy Dispersive X-ray Analysis (EDAX) and UV Spectroscopic analysis, was employed to analyze the nature of the biopolymer composite. The antibacterial activity of the biopolymer composite was also studied.