Photo-controlled K+ Permeation of Polymer/Liquid Crystal Composite Thin Film Containing Photoresponsive Crown Ether

Hirotsugu Kikuchi, Masahiro Katayose, Seiji Shinkai, Osamu Manabe, Tisato Kajiyama, Seiji Shinkai, Osamu Manabe

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4 Citations (Scopus)


A ternary polymer/liquid crystal/photorespbnsive crown ether composite membrane of several tens of nm in thickness was prepared by a water-cast method. A ternary composite thin film was prepared by building up several tens of layers of the water-cast composite membrane. Two types of photoresponsive crown ethers, AZO-CR (1) and AZO-CR(2) as shown in Fig. 1 were used. The aggregation state of the composite membrane was investigated by transmission electron microscopic observation and DSC measurements. These measurements revealed that the liquid crystalline material formed a continuous phase interpenetrating with the spongy three-dimensional network of PVC. It was also confirmed that photoresponsive crown ether molecules were dispersed almost molecularly in liquid crystal domains. These results indicate that liquid crystal domains can play a role as a transporting phase for carriers and penetrants. The UV absorption measurements upon UV and VIS irradiations reveal that trans-cis photoisomerization of photoresponsive crown ether ocurred even in the ternary composite thin film. The photoresponsive facilitated transport of K+ through the polymer/liquid crystal/AZO-CR(1) composite thin film was investigated. Also, the active transport of K+ driven by photoirradiation and pH gradient through the ternary composite thin film containing AZO-CR(2) was investigated.

Original languageEnglish
Pages (from-to)423-429
Number of pages7
Issue number3
Publication statusPublished - 1987

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)


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