Coexistences of lamellar phases in ternary surfactant solutions

Isamu Sou, Ryuichi Okamoto, Shigeyuki Komura, Jean Wolff

Research output: Contribution to journalArticle

Abstract

We theoretically investigate the coexistences of lamellar phases both in binary and in ternary surfactant solutions. The previous free energy of a lamellar stack is extended to take into account the translational entropy of membrane segments. The obtained phase diagram for binary surfactant solutions (surfactant/water mixtures) shows a phase separation between two lamellar phases and also exhibits a critical point. For lamellar phases in ternary surfactant solutions (surfactant/surfactant/water mixtures), we explore the possible phase behaviors and show that the phase diagrams exhibit various three-phase regions as well as two-phase regions in which different lamellar phases coexist. We also find that finite surface tension suppresses the undulation fluctuations of membranes and leads to a wider three-phase and two-phase coexistence regions.

Original languageEnglish
Pages (from-to)272-281
Number of pages10
JournalSoft Materials
Volume15
Issue number4
DOIs
Publication statusPublished - Oct 2 2017
Externally publishedYes

Fingerprint

Surface-Active Agents
Surface active agents
surfactants
Phase diagrams
phase diagrams
membranes
Membranes
Water
Phase behavior
Phase separation
water
Free energy
Surface tension
critical point
interfacial tension
Entropy
free energy
entropy

Keywords

  • Helfrich interaction
  • Lamellar phase
  • phase behaviors
  • surfactant solutions

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Coexistences of lamellar phases in ternary surfactant solutions. / Sou, Isamu; Okamoto, Ryuichi; Komura, Shigeyuki; Wolff, Jean.

In: Soft Materials, Vol. 15, No. 4, 02.10.2017, p. 272-281.

Research output: Contribution to journalArticle

Sou, Isamu ; Okamoto, Ryuichi ; Komura, Shigeyuki ; Wolff, Jean. / Coexistences of lamellar phases in ternary surfactant solutions. In: Soft Materials. 2017 ; Vol. 15, No. 4. pp. 272-281.
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