EPR study of the polydomain structure of the twist-bend nematic phase of CB9CB in the bulk

被引：4

作者：

Bacchiocchi, Corrado ^{[1
]}

Tamba, Maria-Gabriela ^{[2
]}

Mehl, Georg H. ^{[2
]}

Arcioni, Alberto ^{[3
]}

Miglioli, Isabella ^{[3
]}

Zannoni, Claudio ^{[3
]}

机构：

[1] Univ Camerino, Div Chem, Sch Sci & Technol, Camerino, MC, Italy

[2] Univ Hull, Dept Chem, Kingston Upon Hull, N Humberside, England

[3] Univ Bologna, Dipartimento Chim Ind Toso Montanari, Bologna, Italy

来源：

LIQUID CRYSTALS | 2018年 / 45卷 / 13-15期

基金：

英国工程与自然科学研究理事会;

关键词：

Bent-shaped bimesogenic liquid-crystals; dimers; orientational order; dynamics; LIQUID-CRYSTAL DIMERS; DIRECTOR CONFIGURATION; ORDER; DYNAMICS;

D O I：

10.1080/02678292.2018.1501110

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

EPR spin probe spectra of the liquid crystal phases exhibited, in the bulk, by the 1 '', 9 ''-bis(4-cyanobiphenyl- 4'-yl) nonane (CB9CB) bent-shape dimer showed that, on cooling from the isotropic phase, this material forms a uniaxial nematic phase with a uniform director macroscopically aligned along the spectrometer field. Upon further cooling, a transition into the twist-bend nematic phase is observed after a biphasic region of approximately 4 K. In this lower temperature nematic phase, the director does not appear to be macroscopically aligned. The non-uniform director distribution is modelled as a collection of monodomains tilted with respect to the magnetic field and orientationally distributed around the tilt direction. [GRAPHICS] .

引用

页码：2109 / 2120

页数：12

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