Liquid crystal phases with unusual structures and physical properties formed by acute-angle bent-core molecules

Liquid crystals formed by acute-angle bent-core (ABC) molecules with a 1,7 naphthalene central core show an intriguing phase behavior with the nematic phase accompanied by poorly understood additional phases. In this work, we characterize the physical properties of an ABC material, such as birefring...

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Bibliographic Details
Published inarXiv.org
Main Authors Bing-Xiang, Li, Nastishin, Yuriy A, Wang, Hao, Gao, Min, Paladugu, Sathyanarayana, Li, Ruipeng, Fukuto, Masafumi, Li, Quan, Shiyanovskii, Sergiy V, Lavrentovich, Oleg D
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 18.08.2020
Subjects
Birefringence
Columns (structural)
Crystal structure
Crystals
Dielectric properties
Elastic properties
Liquid crystals
Naphthalene
Physical properties
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Summary:Liquid crystals formed by acute-angle bent-core (ABC) molecules with a 1,7 naphthalene central core show an intriguing phase behavior with the nematic phase accompanied by poorly understood additional phases. In this work, we characterize the physical properties of an ABC material, such as birefringence, dielectric permittivities, elastic constants, and surface alignment, and present X-ray diffraction and transmission electron microscopy studies of their ordering. The ABC molecular shape resembling the letter \(\lambda\) yields a very small splay elastic constant in the uniaxial nematic phase and results in the formation of a tetragonal positionally ordered columnar phase consisting of molecular columns with a uniform uniaxial director that can be bent but not splayed.
ISSN:2331-8422