Browsing by Author "Bushiri, MJ"

Now showing 1 - 3 of 3
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    Synthesis of cubic ZnS microspheres exhibiting broad visible emission for bioimaging applications
    (LUMINESCENCE, 2016) Sajan, P; Jayasree, RS; Agouram, S; Bushiri, MJ
    Biocompatible ZnS microspheres with an average diameter of 3.85 mu m were grown by solvo-hydrothermal (S-H) method using water-acetonitrile-ethylenediamine (EDA) solution combination. ZnS microspheres were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), Fourier transform (FT)-Raman spectroscopy and Fourier transform infrared spectroscopy (FTIR) techniques. The broad photoluminescence (PL) emissions from 380-580nm that were seen from the ZnS microspheres attributed to the increase in carrier concentration, as understood from the observed intense Raman band at 257cm(-1). Cytotoxicity and haemocompatibility investigations of these ZnS microspheres revealed its biocompatibility. ZnS microspheres, along with biological cell lines, were giving visible light emission and could be used for bioimaging applications. Copyright (c) 2015 John Wiley & Sons, Ltd.
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    Temperature dependent Raman spectra of nona aqua lanthanoid (Pr) single crystal
    (Spectrochim Acta, 2006) Jayasree, RS; Bushiri, MJ; John, A; Nayar, VU
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    Temperature dependent polarized Raman spectra of nonaaqualanthanoid (Pr) single crystal
    (SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, 2006)
    Polarized Raman spectral changes with respect to temperature were investigated for Pr(BrO3)(3)center dot 9H(2)O single crystals. FTIR spectra of hydrated and deuterated analogues were also recorded and analysed. Temperature dependent Raman spectral variation have been explained with the help of the thermograms recorded for the crystal. Factor group analysis could propose the appearance of BrO3 ions at sites corresponding to C-3v (4) and D-3h (2). Analysis of the vibrational bands at room temperature confirms a distorted C3v symmetry for the BrO3 ion in the crystal. From the vibrations of water molecules, hydrogen bonds of varying strengths have also been identified in the crystal. The appearance v(1) mode of BrO3- anion at lower wavenumber region is attributed to the attachment of hydrogen atoms to the BrO3 anion. At high temperatures, structural rearrangement is taking place for both H2O molecule and BrO3 ions leading to the loss of water molecules and structural reorientation of bromate ions causing phase transition of the crystal at the temperature of 447 K. (c) 2005 Elsevier B.V. All rights reserved.