Macroscopic pattern formation of liquid crystal in κ-carrageenan gel

Takayuki Narita, Isamu Ohnishi, Masayuki Tokita, Yushi Oishi

研究成果: Contribution to journalArticle査読

6 被引用数 (Scopus)

抄録

A macroscopic pattern consisting of liquid crystal layers in hydorgel is self-organized. The pattern forms when potassium ion diffuses into a κ-carrageenan solution from one end of the glass capillary that contains the κ-carrageenan solution. Both the distance between two adjacent liquid crystalline layers (spacing, xn+1 - xn,) and thickness of liquid crystalline layers (width, wn) depend linearly on the distance from the diffusing end of the potassium ion xn. The time prior to the formation of the nth liquid crystalline layer tn depends linearly on xn2. In addition, the spacing coefficient p is inversely proportional to the concentration of potassium ions. These results are in good agreement with the Liesegang phenomenon. In this system the κ-carrageenan solution behaves as a supporting medium for the spatial pattern, as well as the pattern forming substance. The lower values of p, rather than the common Liesegang pattern, in this system could be attributed to the large molecular weight of the κ-carrageenan-potassium complex. The pattern consisted of discrete liquid crystal phases must be formed due to the much larger diffusion constant of potassium ion (diffusant) than that of κ-carrageenan (product).

本文言語英語
ページ(範囲)117-120
ページ数4
ジャーナルColloids and Surfaces A: Physicochemical and Engineering Aspects
321
1-3
DOI
出版ステータス出版済み - 5 15 2008

All Science Journal Classification (ASJC) codes

  • 表面および界面
  • 物理化学および理論化学
  • コロイド化学および表面化学

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