Scattering study of the lyotropic lamellar phase in aqueous solutions of nonionic surfactants

Tadashi Kato, Koji Minewaki, Hirohisa Yoshida, Masayuki Imai, Kazuki Ito

Research output: Contribution to journalArticle

Abstract

Small angle x-ray scattering (SAXS) has been measured on the lamellar phase and concentrated micellar solutions for heptaethylene glycol-n-hexadecyl ether (C 16 E 7 )-water system. The repeat distance d follows the swelling law d ∝ φ hc .s where φ hc is the volume fraction of hydrophobic layers. In the higher temperature range, the exponent s is unity as expected. However, reduction of temperature induces gradual transition of s from unity to 2/3 which corresponds to the upper limit of theoretical values for the mesh phase. Based on these results and line shape analyses of SAXS, it has been shown that the deviation from the classical lamellar structure is enhanced as the temperature and concentration are reduced and the most pronounced near the boundary with bicontinuous cubic and micellar phases. Relations with phase behaviors and the structure of the micellar phase are also discussed.

Original languageEnglish
Pages (from-to)25-30
Number of pages6
JournalStudies in Surface Science and Catalysis
Volume132
Publication statusPublished - 2001 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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