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Multicritical behaviors and an induced twist grain boundary phase in a binary liquid crystalline mixture

Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, ISSN: 1063-651X, Vol: 61, Issue: 1, Page: 519-525
2000
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We report here the composition-temperature phase diagram of a mixture between [Formula Presented] and [Formula Presented] terms of a chiral tolans series shortly noted [Formula Presented] This diagram constitutes an experimental illustration of one of the three theoretical phase diagrams predicted by the Renn and Lubensky’s model. The pure compounds [Formula Presented] and [Formula Presented] exhibit, respectively, the phase sequences [Formula Presented] and [Formula Presented] where TGB refers to a twist grain boundary phase. Phases identification and transition temperatures, at atmospheric pressure, have been determined by both optical microscopy and photothermal methods. The experimental phase diagram shows the disappearance of Sm-[Formula Presented] and [Formula Presented] mesophases and the appearance of a [Formula Presented] phase when the [Formula Presented] composition increases. Four of the five multicritical points theoretically anticipated by Renn and Lubensky are pointed out. © 2000 The American Physical Society.

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