123520-85-4Relevant academic research and scientific papers
Mesomorphic and structural properties of liquid crystal possessing a chiral lactate unit
Das, Banani,Pramanik, Anamika,Das, Malay Kumar,Bubnov, Alexej,Hamplová, Věra,Ka?par, Miroslav
, p. 119 - 125 (2012)
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 TGBA 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 TGBA phase, the d values show strong temperature dependence near SmA-TGBA 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-TGBA phase transition. Near the TGBA-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-TGBA phase transition indicating second order phase transition.
