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分子柔性对高度双轴分子非对称液晶二聚体向列相-各向同性相转变的影响。

Effect of Molecular Flexibility on the Nematic-to-Isotropic Phase Transition for Highly Biaxial Molecular Non-Symmetric Liquid Crystal Dimers.

作者信息

Sebastián Nerea, López David Orencio, Diez-Berart Sergio, de la Fuente María Rosario, Salud Josep, Pérez-Jubindo Miguel Angel, Ros María Blanca

机构信息

Departamento de Física Aplicada II, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apartado 644, E-48080 Bilbao, Spain.

Grup de Propietas Físiques dels Materials (GRPFM), Departament de Física i Enginyeria Nuclear, E.T.S.E.I.B., Universitat Politècnica de Catalunya, Diagonal 647, 08028 Barcelona, Spain.

出版信息

Materials (Basel). 2011 Sep 27;4(10):1632-1647. doi: 10.3390/ma4101632.

DOI:10.3390/ma4101632
PMID:28824100
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5448881/
Abstract

In this work, a study of the nematic (N)-isotropic (I) phase transition has been made in a series of odd non-symmetric liquid crystal dimers, the α-(4-cyanobiphenyl-4'-yloxy)-ω-(1-pyrenimine-benzylidene-4'-oxy) alkanes, by means of accurate calorimetric and dielectric measurements. These materials are potential candidates to present the elusive biaxial nematic (N) phase, as they exhibit both molecular biaxiality and flexibility. According to the theory, the uniaxial nematic (N)-isotropic (I) phase transition is first-order in nature, whereas the N-I phase transition is second-order. Thus, a fine analysis of the critical behavior of the N-I phase transition would allow us to determine the presence or not of the biaxial nematic phase and understand how the molecular biaxiality and flexibility of these compounds influences the critical behavior of the N-I phase transition.

摘要

在这项工作中，通过精确的量热法和介电测量，对一系列奇数非对称液晶二聚体α-(4-氰基联苯-4'-氧基)-ω-(1-芘亚胺-亚苄基-4'-氧基)烷烃的向列相（N）-各向同性相（I）转变进行了研究。这些材料有可能呈现难以捉摸的双轴向列相（N），因为它们既表现出分子双轴性又具有柔韧性。根据理论，单轴向列相（N）-各向同性相（I）转变本质上是一级的，而N-I相转变是二级的。因此，对N-I相转变的临界行为进行精细分析将使我们能够确定双轴向列相是否存在，并了解这些化合物的分子双轴性和柔韧性如何影响N-I相转变的临界行为。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fbea/5448881/50eecf11cb0d/materials-04-01632-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fbea/5448881/f8f3654750bb/materials-04-01632-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fbea/5448881/84b98c237811/materials-04-01632-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fbea/5448881/b89944a1d1a1/materials-04-01632-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fbea/5448881/9cc2f0983e95/materials-04-01632-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fbea/5448881/8792d783c40b/materials-04-01632-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fbea/5448881/50eecf11cb0d/materials-04-01632-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fbea/5448881/f8f3654750bb/materials-04-01632-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fbea/5448881/84b98c237811/materials-04-01632-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fbea/5448881/b89944a1d1a1/materials-04-01632-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fbea/5448881/9cc2f0983e95/materials-04-01632-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fbea/5448881/8792d783c40b/materials-04-01632-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fbea/5448881/50eecf11cb0d/materials-04-01632-g005.jpg

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本文引用的文献

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