Induced twisted-grain-boundary phases in the binary mixtures of a cholesteric and a nematic compound

被引：9

作者：

Dhar, R ^{[1
]}

Srivastava, AK

Agrawal, VK

机构：

[1] Ewing Christian Coll, Dept Phys, Allahabad 211003, Uttar Pradesh, India

[2] Univ Allahabad, Dept Phys, Allahabad 211002, Uttar Pradesh, India

来源：

PHASE TRANSITIONS | 2003年 / 76卷 / 11期

关键词：

binary mixture; TGB phases; chiral Chen-Lubenski model; dielectric permittivity;

D O I：

10.1080/0141159031000140749

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Thermodynamical, optical-texture and dielectric studies have been performed to study the phase diagram of the binary system of 5-cholesten-3beta-ol-octanoate and 4-n-nonyloxybenzoic acid. It is observed that low concentrations of 5-cholesten-3beta-ol-octanoate (2-30 mol %) in 4-n-nonyloxybenzoic acid induce a mean-field phase diagram derived by Renn within the framework of the chiral Chen-Lubenski model. Various optical textures of the twisted-grain-boundary (TGB) phases under different conditions of molecular anchoring have been observed. Weak transitions related to the TGB phases have been detected by temperature dependent dielectric spectroscopy.

引用

页码：959 / 974

页数：16

共 37 条

[1]

[Anonymous], 1983, ELECT OPTICAL MAGNET

[2]

[Anonymous], [No title captured]

[3] Three chiral tolane series with twist grain boundary smectic A and C mesophases [J].

Bouchta, A ;

Nguyen, HT ;

Navailles, L ;

Barois, P ;

Destrade, C ;

Bougrioua, F ;

Isaert, N .

JOURNAL OF MATERIALS CHEMISTRY, 1995, 5 (12) :2079-2092

[4] Novel twist grain boundary smectic-C phases [J].

Brunet, M ;

Navailles, L ;

Clark, NA .

EUROPEAN PHYSICAL JOURNAL E, 2002, 7 (01) :5-11

[5] SYNTHESIS AND CHARACTERIZATION OF NEW SERIES OF FERROELECTRIC LIQUID-CRYSTALS CONTAINING OLIGOOXYETHYLENE SPACERS [J].

CHEN, JH ;

CHANG, RC ;

HSIUE, GH ;

GUU, FW ;

WU, SL .

LIQUID CRYSTALS, 1995, 18 (02) :291-301

[6] Twisted grain boundary phases in the binary mixtures of 3β-chloro-5-cholestene and 4-n-decyloxybenzoic acid [J].

Dhar, R ;

Pandey, MB ;

Agrawal, VK .

PHASE TRANSITIONS, 2003, 76 (08) :763-780

[7]

DHAR R, 2003, IN PRESS MOL CRYST L

[8] A review of textures of the TGBA* phase under different anchoring geometries [J].

Dierking, I ;

Lagerwall, ST .

LIQUID CRYSTALS, 1999, 26 (01) :83-95

[9] Twist-grain-boundary phase diagrams in chiral liquid crystals [J].

Garland, CW .

LIQUID CRYSTALS, 1999, 26 (05) :669-677

[10] CHARACTERIZATION OF A NEW HELICAL SMECTIC LIQUID-CRYSTAL [J].

GOODBY, JW ;

WAUGH, MA ;

STEIN, SM ;

CHIN, E ;

PINDAK, R ;

PATEL, JS .

NATURE, 1989, 337 (6206) :449-452

← 1 2 3 4 →