Coefficient of volume expansion and thermoacoustic parameters of alkyl-cyano-biphenyl liquid crystals

Dilatometric studies were performed on the nematic and isotropic phases of the homologous series of alkyl-cyano-biphenyl liquid crystals C-n H2n+1.C6H 4..C6H4. CN for n = 5 to 9. From these studies the coefficient of Volume ex pansion (alpha) of the liquid crystal is estimated. Using this data a numbe r of thermoacoustic and an harmonic parameters of the liquid crystal are ev aluated. The temperature dependence of these parameters have also been inve stigated. All these thermoacoustic and an harmonic parameters evaluated in this case show characteristic change in the immediate vicinity of the phase transition temperature.