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

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)16312-16320
Number of pages9
JournalPhysical Chemistry Chemical Physics
Volume14
Issue number47
DOIs
Publication statusPublished - 2012 Dec 14

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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