Smectic A-C-A Liquid Crystal Reentrance: A Photon Transmission Study

Ultraviolet/visible photon transmission measurements were applied to study liquid crystal phase transitions in the binary BOPDOB-BOPOOB mixture. A sequence exhibiting a new reentrant, namely isotropic-nematic-smectic A-C-A as temperature is lowered, is identified. For the smectic A-C transition, the...

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Bibliographic Details
Published in:Phase transitions 2002, Vol.75 (3), p.301-308
Main Authors: Özbek, Haluk, Yildiz, Sevtap, Pekcan, Önder, Berker, A. Nihat
Format: Article
Language:English
Subjects:
Binary Mixture
Critical Exponent
Crossover
Photon Transmission Technique
Reentrant Phase Transitions
Smectic Order
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Summary:Ultraviolet/visible photon transmission measurements were applied to study liquid crystal phase transitions in the binary BOPDOB-BOPOOB mixture. A sequence exhibiting a new reentrant, namely isotropic-nematic-smectic A-C-A as temperature is lowered, is identified. For the smectic A-C transition, the critical exponent g is seen to cross over from the mean-field 0.501 - 0.008 to the helium-like 0.336 - 0.012 as the transition is approached. The reentrant C-A transition is first-order, signalling a tricritical point in the phase diagram.
ISSN:0141-1594
1029-0338
DOI:10.1080/01411590290020420