| Abstract: | Investigations on the phase transition studies in the thermotropic liquid crystals, (1) pcyanophenyl trans-4-propylcyclohexane carboxylate, (2) p-cyanophenyl trans-4-pentyl-cyclohexane carboxylate, (3) 4′-n-pentyloxy-4-cyanobiphenyl and (4) 4′-n-octyloxy-4-cyanobiphenyl are carried out by the thermal microscopy and the differential scanning calorimetric (DSC) studies. These studies reveal that the first three mesogens exhibit a single mesophase while the fourth one exhibits a smectic A phase in addition to the nematic phase. The textures exhibited by these mesogens in their mesophases and their transition temperatures, enthalpies and entropies are presented. |
