Rheology of schizophyllan solutions in isotropic and anisotropic phase regions

Yapeng Fang, Makoto Takemasa, Keiko Katsuta, Katsuyoshi Nishinari*

*この研究の対応する著者

研究成果: Article査読

26 被引用数 (Scopus)

抄録

In this paper, we discuss the rheological properties of aqueous solutions of a rigid triple-helical polysaccharide, schizophyllan (SPG), in isotropic, biphasic, and fully anisotropic phases. Both steady shear and dynamic rheological behaviors reveal remarkable changes when SPG solutions pass through the three phases. The steady shear flow exhibits shear thickening at low shear rates for anisotropic SPG liquid crystalline samples, which is attributed to the shear-induced cholesteric to nematic transformation. The first normal stress difference and transient rheological experiments demonstrate that director tumbling is absent or negligible in SPG liquid crystals in the range of examined shear rates. Additionally, the stress relaxation of SPG liquid crystals after flow cessation shows an inverse relation between the relaxation time and preshear rate, as expected by Larson and Mead's theory [Larson and Mead (1989)]. Small amplitude oscillation measurements following flow cessation show decreasing complex modulus with time for SPG liquid crystals, which is probably related to an increase of molecular orientation after flow cessation. The evolutions of complex modulus after flow cessation are discussed in terms of chain persistence length.

本文言語English
ページ(範囲)1147-1166
ページ数20
ジャーナルJournal of Rheology
48
5
DOI
出版ステータスPublished - 2004 9月
外部発表はい

ASJC Scopus subject areas

  • 材料力学
  • 計算力学
  • 物理学および天文学(全般)

フィンガープリント

「Rheology of schizophyllan solutions in isotropic and anisotropic phase regions」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル