Universality and specificity in molecular orientation in anisotropic gels prepared by diffusion method

Yasuyuki Maki, Kazuya Furusawa, Sho Yasuraoka, Hideki Okamura, Natsuki Hosoya, Mari Sunaga, Toshiaki Dobashi, Yasunobu Sugimoto, Katsuzo Wakabayashi

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Molecular orientation in anisotropic gels of chitosan, Curdlan and DNA obtained by dialysis of those aqueous solutions in gelation-inducing solutions was investigated. In this diffusion method (or dialysis method), the gel formation was induced by letting small molecules diffuse in or out of the polymer solutions through the surface. For the gels of DNA and chitosan, the polymer chains aligned perpendicular to the diffusion direction. The same direction of molecular orientation was observed for the Curdlan gel prepared in the dialysis cell. On the other hand, a peculiar nature was observed for the Curdlan gel prepared in the dialysis tube: the molecular orientation was perpendicular to the diffusion direction in the outermost layer of the gel, while the orientation was parallel to the diffusion direction in the inner translucent layer. The orientation parallel to the diffusion direction is attributed to a small deformation of the inner translucent layer caused by a slight shrinkage of the central region after the gel formation. At least near the surface of the gel, the molecular orientation perpendicular to the diffusion direction is a universal characteristic for the gels prepared by the diffusion method.

Original languageEnglish
Pages (from-to)118-126
Number of pages9
JournalCarbohydrate Polymers
Volume108
Issue number1
DOIs
Publication statusPublished - Aug 8 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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