Smectic-smectic phase transitions in binary liquid-crystalline mixtures of DB5-T8

Article abstract of DOI:10.1063/1.457798

We have used high-resolution x-ray diffraction and ac calorimetry to study the liquid-crystalline smectic-A-smectic-A phase transitions in binary mixtures of polar mesogenic compounds DB₅ phenyl ester> and T₈ <(E)-benzoic acid, 4-octyloxy-4-<2-(4-cyanophenyl> ethenyl> phenyl ester>.A detailed synthesis for each of these compounds is presented.The smectic A₁ phase in this system shows two collinear diffuse x-ray maxima at incommensurate wave vectors, indicating a tendency to form the predicted A_i1 phase with two strongly coupled density modulations having incommensurate wavelengths.The A_d peak position, while both temperature and concentration dependent, is remarkably constant along the N-A_d phase boundary.In the vicinity of 16 mol percent T₈, both the x-ray and heat-capacity results are reproducibly history dependent.The simultaneous observation of sharp A₂ and A_d peaks most likely results from phase coexistence, but a condensed incommensurate A_i2 phase cannot be ruled out.

Full text of DOI:10.1063/1.457798

Smectic–smectic phase transitions in binary liquid‐crystalline mixtures of DB5–T8
Ernest Fontes, Wah Keat Lee, Paul A. Heiney, George Nounesis, Carl W. Garland, Antoni Riera, John P.
McCauley Jr., and Amos B. Smith III
Citation: The Journal of Chemical Physics 92, 3917 (1990); doi: 10.1063/1.457798
View online: http://dx.doi.org/10.1063/1.457798
View Table of Contents: http://scitation.aip.org/content/aip/journal/jcp/92/6?ver=pdfcov
Published by the AIP Publishing
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This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
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This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
134.129.120.3 On: Mon, 01 Jun 2015 13:33:36

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
134.129.120.3 On: Mon, 01 Jun 2015 13:33:36

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
134.129.120.3 On: Mon, 01 Jun 2015 13:33:36

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
134.129.120.3 On: Mon, 01 Jun 2015 13:33:36

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
134.129.120.3 On: Mon, 01 Jun 2015 13:33:36

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
134.129.120.3 On: Mon, 01 Jun 2015 13:33:36

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
134.129.120.3 On: Mon, 01 Jun 2015 13:33:36

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
134.129.120.3 On: Mon, 01 Jun 2015 13:33:36

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
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