Physical Review E
Spin Gas Model, Phase Transitions, Liquid Crystals, Antiphase, Mesogen, Speckle
Reentrant nematic phases and smectic antiphases occur as intermediate states between two one-dimensionally ordered frustrated smectic phases, characterized by two competing and, in general, incommensurate smectic density waves. Using high-resolution x-ray diffraction, we have examined the evolution of the two density waves as a function of temperature in all phases of a mixture of polar liquid crystals octyl-and decyl-oxyphenyl nitrobenzoyloxy benzoate (47.4 mol% DB8ONO2+52.6% DB10ONO2). This mixture exhibits at temperatures below 127 degrees C the liquid-crystal phase sequence: smectic-A(d), reentrant nematic phases N-d and N-1, smectic-A(1), tilted antiphase (C) over tilde, smectic-A(2), and smectic-C-2 phases. Detailed investigations of several order-disorder transitions and the evolution of fluctuation effects in this system are reported.
Shi, Yushan; Nounesis, George; Garland, Carl W.; and Kumar, Satyendra (1997). High Resolution X-Ray Diffraction Study of Smectic Polymorphism and Fluctuations in a Mixture of Octyl- and Decyl-Oxyphenyl Nitrobenzoyloxy Benzoate. Physical Review E 56(5), 5575-5584. doi: 10.1103/PhysRevE.56.5575 Retrieved from http://digitalcommons.kent.edu/phypubs/33