Freezing and melting behavior of an octyl β-d-glucoside-water binary system - Inhibitory effect of octyl β-d-glucoside on ice crystal formation

Shigesaburo Ogawa, Kouichi Asakura, Shuichi Osanai

研究成果: Article査読

12 被引用数 (Scopus)

抄録

Phase transition behavior of lyotropic liquid crystals of an octyl β-d-glucoside (OG)-water binary system during ice freezing and melting was studied by differential scanning calorimetry (DSC) and polarizing optical microscopy (POM). Not the thermotropic, but the lyotropic phase transition due to the change of OG concentration during ice freezing and melting was observed. The concentration-temperature phase diagram of the binary system was constructed. Melting temperature of ice, T m, lyotropic phase transition temperature, T tr, and glass transition temperatures of unfrozen phases in the absence and presence of ice, T g and, were shown in the phase diagram. The phase diagram indicated that the OG aqueous system was concentrated to ca. 90-92 wt% by ice freezing and exhibited glass transition at. An observation of the concentration-gradient specimen by the cryo-POM showed the evidence of the inhibitory effects of OG on nucleation and growth of ice crystals in the extremely high OG concentration system in which the lamellar liquid crystalline phase was formed. This study provided the importance of the influence of concentration change by ice freezing on the behaviour of the sugar-based surfactant-water system under low temperature conditions.

本文言語English
ページ(範囲)16312-16320
ページ数9
ジャーナルPhysical Chemistry Chemical Physics
14
47
DOI
出版ステータスPublished - 2012 12月 14

ASJC Scopus subject areas

  • 物理学および天文学(全般)
  • 物理化学および理論化学

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