Twist-bend heliconical chiral nematic liquid crystal phase of an achiral rigid bent-core mesogen

被引：229

作者：

Chen, Dong ^{[1
,2
]}

Nakata, Michi ^{[1
,2
]}

Shao, Renfan ^{[1
,2
]}

Tuchband, Michael R. ^{[1
,2
]}

Shuai, Min ^{[1
,2
]}

Baumeister, Ute ^{[3
]}

Weissflog, Wolfgang ^{[3
]}

Walba, David M. ^{[2
,4
]}

Glaser, Matthew A. ^{[1
,2
]}

Maclennan, Joseph E. ^{[1
,2
]}

Clark, Noel A. ^{[1
,2
]}

机构：

[1] Univ Colorado, Dept Phys, Boulder, CO 80309 USA

[2] Univ Colorado, Liquid Crystal Mat Res Ctr, Boulder, CO 80309 USA

[3] Univ Halle Wittenberg, Inst Chem, D-06120 Halle, Saale, Germany

[4] Univ Colorado, Dept Chem & Biochem, Boulder, CO 80309 USA

来源：

PHYSICAL REVIEW E | 2014年 / 89卷 / 02期

关键词：

BANANA-SHAPED MOLECULES; DIMERS; OLIGOMERS;

D O I：

10.1103/PhysRevE.89.022506

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

The chiral, heliconical (twist-bend) nematic ground state is reported in an achiral, rigid, bent-core mesogen (UD68). Similar to the nematic twist-bend (N-TB) phase observed in bent molecular dimers, the N-TB phase of UD68 forms macroscopic, smecticlike focal-conic textures and exhibits nanoscale, periodic modulation with no associated modulation of the electron density, i.e., without a detectable lamellar x-ray reflection peak. The N-TB helical pitch is p(TB) similar to 14 nm. When an electric field is applied normal to the helix axis, a weak electroclinic effect is observed, revealing 50-mu m-scale left- and right-handed domains in a chiral conglomerate.

引用

页数：5

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