Steric Effects in Polar Nematic Liquid Crystals

被引：0

作者：

Bisi, F. ^{[1
,2
]}

机构：

[1] Univ Pavia, Dipartimento Matemat, I-27100 Pavia, Italy

[2] Fdn Univ Mantova, Lab Appl Math LAMA, Mantua, Italy

来源：

MOLECULAR CRYSTALS AND LIQUID CRYSTALS | 2011年 / 541卷

关键词：

Ferroelectricity; nematic liquid crystal; polar nematics; steric tensor; AROMATIC POLYESTERS; BIAXIAL NEMATICS; FLUIDS;

D O I：

10.1080/15421406.2011.570182

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Recent measurements in a nematic liquid crystal formed by polyester compounds have given evidence of spontaneous macroscopic polar ordering. A mean-field theory for liquid crystals is built combining short-range, repulsive, steric forces with the average electric dipolar energy exchanged between molecules sharing the same excluded region. Such model is capable of identifying both uniaxial and biaxial polar phases. Under the assumption of a spheroidal shape for the molecules, and through a numerical bifurcation analysis, we assess the stability of phases upon two interaction parameters: the degree of intrinsic biaxiality, and the relative orientation of the permanent electric dipoles.

引用

页码：370 / 379

页数：10

共 24 条

[11] HYDRODYNAMICS OF BIAXIAL DISCOTICS [J].

BRAND, H ;

PLEINER, H .

PHYSICAL REVIEW A, 1981, 24 (05) :2777-2788

[12] Constrained stability for biaxial nematic phases [J].

De Matteis, Giovanni ;

Bisi, Fulvio ;

Virga, Epifanio G. .

CONTINUUM MECHANICS AND THERMODYNAMICS, 2007, 19 (1-2) :1-23

[13] Unusual nematic liquid crystal with polar Cs symmetry formed from aromatic polyesters with head-tail character [J].

Koike, Masao ;

Yen, Chu-Chun ;

Liu, Yuqing ;

Tsuchiya, Hitoshi ;

Tokita, Masatoshi ;

Kawauchi, Susumu ;

Takezoe, Hideo ;

Watanabe, Junji .

MACROMOLECULES, 2007, 40 (07) :2524-2531

[14] Can liquids be macroscopically polar? [J].

Lagerwall, ST .

JOURNAL OF PHYSICS-CONDENSED MATTER, 1996, 8 (47) :9143-9166

[15] HYDRODYNAMIC THEORY OF BIAXIAL NEMATICS [J].

LIU, M .

PHYSICAL REVIEW A, 1981, 24 (05) :2720-2726

[16] Theory of polar biaxial nematic phases -: art. no. 031701 [J].

Mettout, B ;

Tolédano, P ;

Takezoe, H ;

Watanabe, J .

PHYSICAL REVIEW E, 2002, 66 (03)

[17] FERROELECTRIC NEMATIC LIQUID-CRYSTALS - REALIZABILITY AND MOLECULAR CONSTRAINTS [J].

PALFFYMUHORAY, P ;

LEE, MA ;

PETSCHEK, RG .

PHYSICAL REVIEW LETTERS, 1988, 60 (22) :2303-2306

[18]

Park B, 2001, PHYS REV E, V63, DOI 10.1103/PhysRevE.63.021707

[19] ELASTIC AND FLOW PROPERTIES OF BIAXIAL NEMATICS [J].

SAUPE, A .

JOURNAL OF CHEMICAL PHYSICS, 1981, 75 (10) :5118-5124

[20] Dielectric shape dispersion and biaxial transitions in nematic liquid crystals [J].

Sonnet, AM ;

Virga, EG ;

Durand, GE .

PHYSICAL REVIEW E, 2003, 67 (06) :7-061701

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