Fluctuations of lamellar structure prior to a [Formula Presented] transition in a nonionic surfactant system

Masayuki Imai, Ayako Kawaguchi, Akira Saeki, Kaori Nakaya, Tadashi Kato, Kazuki Ito, Yoshiyuki Amemiya

研究成果: Article査読

42 被引用数 (Scopus)

抄録

Fluctuations of lamellar structure prior to a [Formula Presented] transition in a nonionic surfactant–water system has been investigated by means of small-angle x-ray scattering (SAXS) and differential scanning calorimeter measurements. For large [Formula Presented] [Formula Presented] where T is the temperature and [Formula Presented] the [Formula Presented] transition temperature) in the lamellar phase, the SAXS profiles can be described by a Caillé correlation function for undulating lamellar structure. Approaching the temperature to the [Formula Presented] an excess diffuse scattering grows at the lower Q (Q is the magnitude of scattering vector) side of the first lamellar peak. Highly oriented lamellar samples revealed that the excess diffuse scattering arises from in-plane density fluctuations. We attribute this diffuse scattering to the perforation fluctuation layer (PFL) structure and we show that the PFL is an equilibrium structure. At [Formula Presented] the PFL transformed to the gyroid phase through a transient ordered structure having a rhombohedral symmetry.

本文言語English
ページ(範囲)6865-6874
ページ数10
ジャーナルPhysical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
62
5
DOI
出版ステータスPublished - 2000 1 1
外部発表はい

ASJC Scopus subject areas

  • 統計物理学および非線形物理学
  • 数理物理学
  • 凝縮系物理学
  • 物理学および天文学(全般)

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