Conference Papers

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    Synthesis and characterization of porous nano crystalline biphasic calcium phosphate for bio applications
    (2012) Shanthi, M.S.L.; Ashok, M.; Balasubramanian, T.
    The nano crystalline biphasic calcium phosphates of hydroxyapatite (HAp)/β-tricalcium phosphate (β-TCp) in the ratio 80:20 and 72:28 with interconnected porosity have successfully been prepared by co-precipitation method using mixed catanionic surfactants as template. The sample was calcinated at various temperatures for 8 h. The samples were characterized using X-ray diffraction, Fourier transform infrared spectroscopy, Field emission scanning electron microscopy (FESEM) and thermal analyser. The samples calcinated at 750°C and 850°C show 75% and 89% of crystallinity respectively. Usually to obtain the biphasic calcium phosphates, either the medium will be set as acidic by altering the pH or the Ca/P ratio can be set below the value of 1.5. However this experiment was neither conducted with low Ca/P ratio (≤1.5) nor at low pH (≤7) to obtain the mixed phase. The combination of surfactants and calcination temperature controls the HAp/β-TCp ratio. © 2012 SPIE.
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    X-ray diffraction studies of CdxZn1-xS thin films prepared by spray pyrolysis technique
    (2013) Raviprakash, Y.; Bangera, K.V.; Shivakumar, G.K.
    Thin films of CdxZn(1-x)S (0 ≤ x ≤ 1) were deposited on glass substrates by the chemical spray pyrolysis technique using a less used combination of chemicals. The variation of structural properties of these films in relation with composition was studied in detail. The entire study was made for a wide range of compositions of CdxZn (1-x) S thin films (x=0 to 1 in steps of 0.1). XRD studies reveal that all the films are polycrystalline with hexagonal (wurtzite) structure of which reflection peaks associated with (100), (002) and (110) planes were clearly identified for all the films and inclusion of cadmium into the structure of ZnS improved the crystallinity of the films. The value of lattice constants 'a' and 'c' was found to vary with composition from 0.382 to 0.415 nm and 0.625 to 0.675 nm respectively. © (2013) Trans Tech Publications, Switzerland.