首页   按字顺浏览 期刊浏览 卷期浏览 Electric Field-Induced Alignment of the Directors in the Smectic A Phase of 4-Octyl-4&#...
Electric Field-Induced Alignment of the Directors in the Smectic A Phase of 4-Octyl-4′-Cyanobiphenyl. A Deuterium NMR Study

 

作者: GeoffreyR. Luckhurst,   Tetsuo Miyamoto,   Akihiko Sugimura,   BakirA. Timimi,  

 

期刊: Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals  (Taylor Available online 2000)
卷期: Volume 347, issue 1  

页码: 147-156

 

ISSN:1058-725X

 

年代: 2000

 

DOI:10.1080/10587250008024836

 

出版商: Taylor & Francis Group

 

关键词: deuterium nuclear magnetic resonance;smectic A director alignment;induction period;electric field-induced alignment

 

数据来源: Taylor

 

摘要:

Deuterium nuclear magnetic resonance (NMR) spectroscopy has been used to investigate the electric field-induced alignment of the director of the smectic A phase of the liquid crystal, 4-α,α-d2-octyl-4′-cyanobiphenyl (8CB-d2), at 303.3K. The electric field is arranged to be orthogonal to the magnetic field. The alignment process has been investigated at different electric field strengths and the rate of director alignment was monitored by recording the deuterium NMR spectra as a function of time after the electric field was switched on. The results reveal a complex pattern of electric field-induced director alignment. At high electric field strengths a rapid process is observed in which the director switches from an orientation parallel to the magnetic field to one in which it is parallel to the electric field. An induction period is also observed in which no apparent change in director orientation occurs. This induction period becomes longer (hours in magnitude) as the electric field strength is lowered. Other, intermediate, director orientations are observed as the electric field strength is lowered further. The role of defects is invoked in trying to interpret some of the observed processes underlying the mechanism of the director alignment in the smectic A phase.

 

点击下载:  PDF (450KB)



返 回