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

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)6865-6874
Number of pages10
JournalPhysical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
Volume62
Issue number5
DOIs
Publication statusPublished - 2000 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Mathematical Physics
  • Condensed Matter Physics
  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Fluctuations of lamellar structure prior to a [Formula Presented] transition in a nonionic surfactant system'. Together they form a unique fingerprint.

  • Cite this