Chiral induction in thioester and oxoester liquid crystals by dispersed carbon nanotubes

被引:33
作者
Basu, Rajratan [1 ]
Rosenblatt, Charles [1 ]
Lemieux, Robert P. [2 ]
机构
[1] Case Western Reserve Univ, Dept Phys, Cleveland, OH 44106 USA
[2] Queens Univ, Dept Chem, Kingston, ON K7L 3N6, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
chiral induction; ester; carbon nanotube; twist; electroclinic; PHASE;
D O I
10.1080/02678292.2011.628703
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Multi-walled carbon nanotubes were dispersed at low concentrations into various achiral liquid crystals having either a thioester or oxoester linkage group in the core. The presence of the carbon nanotubes resulted in chiral signatures being observed in the liquid crystals, including an electroclinic effect (a rotation of the liquid crystal director perpendicular to, and linear in, an applied electric field) in both the nematic and smectic A phases, and a macroscopic helical twist of the liquid crystal director in the nematic phase. For both experiments the chiral signatures for the thioester liquid crystals were found to be an order of magnitude larger than those of the oxoesters. We speculate that the much larger strength of the thioester's chiral properties is a result of stronger non-covalent interactions between the liquid crystal molecule and carbon nanotube.
引用
收藏
页码:199 / 204
页数:6
相关论文
共 33 条
[1]   Supramolecular chiral functional materials [J].
Amabilino, David B. ;
Veciana, Jaurne .
SUPRAMOLECULAR CHIRALITY, 2006, 265 :253-302
[2]   SUBMICROSECOND ELECTROOPTIC SWITCHING IN THE LIQUID-CRYSTAL SMECTIC-A PHASE - THE SOFT-MODE FERROELECTRIC EFFECT [J].
ANDERSSON, G ;
DAHL, I ;
KELLER, P ;
KUCZYNSKI, W ;
LAGERWALL, ST ;
SKARP, K ;
STEBLER, B .
APPLIED PHYSICS LETTERS, 1987, 51 (09) :640-642
[3]   Electrical-field effect on carbon nanotubes in a twisted nematic liquid crystal cell [J].
Baik, IS ;
Jeon, SY ;
Lee, SH ;
Park, KA ;
Jeong, SH ;
An, KH ;
Lee, YH .
APPLIED PHYSICS LETTERS, 2005, 87 (26) :1-3
[4]  
BASU R, UNPUB
[5]   Carbon nanotube-induced macroscopic helical twist in an achiral nematic liquid crystal [J].
Basu, Rajratan ;
Chen, Chia-Ling ;
Rosenblatt, Charles .
JOURNAL OF APPLIED PHYSICS, 2011, 109 (08)
[6]   Nematic electroclinic effect in a carbon-nanotube-doped achiral liquid crystal [J].
Basu, Rajratan ;
Petschek, Rolfe G. ;
Rosenblatt, Charles .
PHYSICAL REVIEW E, 2011, 83 (04)
[7]   Carbon nanotube-induced chirality in an achiral liquid crystal [J].
Basu, Rajratan ;
Boccuzzi, Krysta A. ;
Ferjani, Sameh ;
Rosenblatt, Charles .
APPLIED PHYSICS LETTERS, 2010, 97 (12)
[8]   Orientational coupling enhancement in a carbon nanotube dispersed liquid crystal [J].
Basu, Rajratan ;
Iannacchione, Germano S. .
PHYSICAL REVIEW E, 2010, 81 (05)
[9]   Nematic anchoring on carbon nanotubes [J].
Basu, Rajratan ;
Iannacchione, Germano S. .
APPLIED PHYSICS LETTERS, 2009, 95 (17)
[10]   Carbon nanotube dispersed liquid crystal: A nano electromechanical system [J].
Basu, Rajratan ;
Iannacchione, Germano S. .
APPLIED PHYSICS LETTERS, 2008, 93 (18)