SYNTHESIS AND CHARACTERIZATION OF CdS IN DIOL VANILIN LIQUID CRYSTAL MONOMER
ABSTRACT: Nanocomposites
comprising diol-vanilin and cadmium
sulfide (CdS) has been synthesized via chemical precipitation method in
ethanol at refluxed temperature (160oC)
for 12 hours. CdCl2. 2.5H2O and thiourea as cadmium and sulfide precursors
respectively were employed. Diol vanilin is a thermotropic liquid crystal
monomer which exhibits enantiotropic nematic metaphase texture when observed
under polarizing microscope and confirmed by DSC thermal stability study. A
series of different mass composition
of diol vanilin and CdS
nanocomposites ranging from 0.1:1.0 till
1.0:1.0(w/w) were prepared and characterized using XRD, TEM, SEM-EDX, POM and
DSC. The X-ray diffraction pattern (XRD) showed broad peaks due to the
formation of cubic CdS nanoparticles in diol vanilin matrix. The nanocomposites
at low mass composition of CdS still
maintained their nematic phase. However, the liquid crystal property was
affected when the mass composition of CdS in nanocomposite was increased and the
liquid crystal characteristic vanished when the mass composition was at 0.6:1.0. .
Author: H.L. Lee, M. Abu
Bakar, J. Ismail and A.M. Issam
Journal Code: jpkimiagg070011
