聚电解质包覆液晶液滴的director 构象转变。

Director configuration transitions of polyelectrolyte coated liquid-crystal droplets.

机构信息

Advanced Materials Processing and Analysis Center, Department of Mechanical, Materials, and Aerospace Engineering, University of Central Florida, Orlando, Florida 32816, USA.

出版信息

J Phys Chem B. 2011 Jul 28;115(29):8970-4. doi: 10.1021/jp201909m. Epub 2011 Jun 27.

DOI:10.1021/jp201909m

PMID:21667976

Abstract

Liquid-crystal droplets are of great interest because of their large surface areas, rich phases, and tunable optical properties. The director configuration of liquid-crystal droplets provides a unique optical sign to detect the events occurring at the droplet surface. In this article, we report the alternating bipolar/radial configuration transitions of 4-n-pentyl-4'-cyanobiphenyl (5CB) droplets triggered by the layer-by-layer coating of negatively charged poly(styrenesulfonate sodium (PSS) and positively charged poly(diallyldimethylammonium chloride) (PDADMAC) on the droplet surface. The alternating configuration transitions are due to the interactions of the 5CB with polar versus nonpolar PDADMAC/PSS multilayer coatings. Furthermore, we find that the coating of PDADMAC/PSS multilayers makes the director configuration of the 5CB in the droplets sensitive to environmental salt concentrations.

摘要

液晶液滴因其具有较大的表面积、丰富的相态和可调谐的光学性质而备受关注。液晶液滴的指向矢构形为检测液滴表面发生的事件提供了独特的光学信号。本文报道了在外加电场作用下，通过层层自组装的方法在 4-正戊基-4'-氰基联苯（5CB）液滴表面交替沉积带负电荷的聚苯乙烯磺酸钠（PSS）和带正电荷的聚二烯丙基二甲基氯化铵（PDADMAC），导致 5CB 液晶液滴的双折射态和向列态之间的交替转变。这种转变归因于 5CB 与 PDADMAC/PSS 多层膜之间的相互作用。此外，我们发现 PDADMAC/PSS 多层膜的沉积使得液滴中 5CB 的指向矢构形对环境盐浓度变得敏感。