Abstract
Dispersion of ferroelectric Barium Titanate Nano Particles (BTNPs) in a nematic liquid crystal (NLC) display material namely 4-pentyl-4′-cyanobipheny (5CB) has been studied by differential scanning calorimeter, UV–Vis spectroscopy, polarizing light microscopy, dielectric spectroscopy and electro optical studies. BTNPs have been dispersed in three different concentrations in pure 5CB viz. 0.05, 0.5 and 5.0wt.%. It has been observed that with the increase of BTNP concentrations in 5CB, the nematic to isotropic transition temperatures, parallel components of dielectric permittivity and hence dielectric anisotropy decreases significantly unlike in the earlier studies. Threshold voltage for the Freedericksz transition, switching voltage and splay elastic constant have also decreased due to the dispersion of BTNPs. Relaxation frequency and activation energy of an observed relaxation mode corresponding to molecular rotation about the short axis are almost the same for pure and its nanocomposites. The ionic conductivity has increased by two orders of magnitudes for 0.05wt.% of nanocomposites. The optical study suggests that due to dispersion of BTNPs band gap has decreased.
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