Abstract
Abstract The mesomorphic and structural properties of the chiral lactic acid derivative 4′-(1-(octyloxy)-1-oxopropan-2-yloxy) biphenyl-4-yl 4-(decyloxy)benzoate have been studied. The compound shows the blue phase (BPII), the cholesteric (N * ), the TGB A and the paraelectric SmA * phases over a broad temperature range. Polarising optical microscopy, differential scanning calorimetry, optical transmission, X-ray diffraction and dielectric spectroscopy studies have been performed. In the SmA * phase the layer spacing ( d ) values are found to be slightly temperature dependent and suggest that there is no bi-layer association present in the mesophase. In the TGB A phase, the d values show strong temperature dependence near SmA * –TGB A phase transition, indicating pre-transitional effect. The temperature dependence of scattered X-ray intensities indicate the appearance of long range smectic ordering at the N * –TGB A phase transition. Near the TGB A –SmA * phase boundary strong SmA * fluctuations predominate. This behaviour is also observed from the temperature dependence of the d values. The transverse correlation lengths, ξ ⊥ , diverge near the N * –TGB A phase transition indicating second order phase transition.
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