Director configuration in the twist-bend nematic phase of CB11CB

被引：11
作者：
Miglioli, Isabella [1 ]
Bacchiocchi, Corrado [2 ]
Arcioni, Alberto [1 ]
Kohlmeier, Alexandra [3 ]
Mehl, Georg H. [3 ]
Zannoni, Claudio [1 ]
机构：
[1] Univ Bologna, Dipartimento Chim Ind Toso Montanari, Viale Risorgimento 4, I-40136 Bologna, Italy
[2] Univ Camerino, Sch Sci & Technol, Div Chem, Via S Agostino 1, I-62032 Camerino, MC, Italy
[3] Univ Hull, Dept Chem, Kingston Upon Hull HU6 7RX, N Humberside, England
来源：
JOURNAL OF MATERIALS CHEMISTRY C | 2016年 / 4卷 / 41期
关键词：
BIMESOGENIC LIQUID-CRYSTALS; ELECTRON-SPIN-RESONANCE; FLEXOELECTRIC BEHAVIOR; ORIENTATIONAL ORDER; NMR-SPECTROSCOPY; DYNAMICS; DIMERS; PROBE; EPR; ELASTICITY;
D O I：
10.1039/c6tc03246j
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The director distribution in the nematic phases exhibited by the 1 '',11 ''-bis(4-cyanobiphenyl-4'-yl) undecane (CB11CB) liquid crystal has been studied in the bulk using the EPR spin probe technique. EPR spectra confirmed the presence of a higher temperature uniaxial nematic phase and of a lower temperature nematic phase in which the director distribution is not uniform. Spectra recorded in the lower temperature nematic phase were not fully compatible with theoretical EPR spectra calculated according to the recently proposed model for the twist-bend phase in which the local domain director twists around an axis with a fixed tilt angle, theta(0), but were well described by a "distributed-tilt'' model in which the director has a relatively narrow distribution, centred at theta(0).
引用
收藏
页码：9887 / 9896
页数：10
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