Browsing by Author "Ramalingam, H B"

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    EVALUATION OF STRUCTURAL, SURFACE MORPHOLOGICAL AND THERMAL PROPERTIES OF AG-DOPED ZNO NANOPARTICLES FOR ANTIMICROBIAL ACTIVITIES
    (Elsevier, 2021-09) Ranjithkumar, B; Ranjith Kumar, E; Srinivas, M; Ramalingam, H B; Srinivas, Ch.; Magesh, G; Balamurugan, A; Sharmila Rahale, C; ChandarShekar, B
    Novel properties of green synthesis methods have paved the way for a new area of study in the scientific community. Systematic research was carried out in the current study for Ag-doped ZnO nanostructures prepared using cow urine and honey. The phase evaluation and surface morphological features of prepared nanoparticles were examined using XRD and FE-SEM analysis. From the XRD analysis, the average crystallite size () was estimated and found to be 25.1 nm for cow urine and 29.9 nm for honey-assisted nanomaterial. FE-SEM confirms the presence of plate-like and spherical nanoparticles in the synthesized sample. Compositional analysis of Zn, Ag, and O from EDX spectra showed the reliability of present green synthesis. The thermal analysis of the nanostructures of Ag-ZnO has been investigated and the effect of these natural ingredients on thermal stability has also been analyzed. Antimicrobial activities were tested against two human pathogenic bacteria and their comparative results are presented.
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    NATURAL FUELS (HONEY AND COW URINE) ASSISTED COMBUSTION SYNTHESIS OF ZINC OXIDE NANOPARTICLES FOR ANTIMICROBIAL ACTIVITIES
    (Elsevier, 2021-05-15) Ranjithkumar, B; Ramalingam, H B; Ranjith Kumar, E; Srinivas, Ch; Magesh, G; Sharmila Rahale, C; Nashwa M, El-Metwaly; Chandar Shekar, B
    A novel green synthesis of the combustion pathway was adopted for the preparation of ZnO nanoparticles using Honey and Cow urine. The effects of honey and cow urine on crystalline size, structure, morphology, band gap and thermal properties of ZnO nanoparticles have been analyzed. The polycrystalline hexagonal wurtzite structure of ZnO nanoparticles is confirmed by XRD spectra. The mean crystalline sizes of the ZnO nanoparticles were 23 nm and 29 nm respectively, for the honey and cow urine phase. The external morphology and grain size of the products have been visualized via FE-SEM and TEM. The average sizes of the grains of the ZnO nanoparticles were perfectly associated with the crystalline size measured from the XRD. Spherical and hexagonal shaped nanostructures were reported using FE-SEM and TEM micrographs. The optical absorption spectra of ZnO nanoparticles have been analyzed using UV–Vis spectrometry. In the FT-IR spectra, around 400 cm−1 to 600 cm−1 range have been allotted to the Zn–O vibration. The thermal properties of ZnO nanoparticles have been analyzed using TGA. Changes in weight loss for different ZnO nanoparticles using honey and cow urine have been documented. Gram Positive (B.Subtilis) and Gram-Negative (E.Coli)Bacteria were tested using plate counting technique to study the antimicrobial activity of ZnO nanoparticles prepared by cow's urine and honey. Compared with cow urine-prepared ZnO nanoparticles, honey-assisted ZnO nanoparticles demonstrate strong antibacterial activity.