Spontaneous vesicle formation of mixtures of double-chain cationic surfactants with a different counterion

Makoto Aratono, Azusa Mori, Ikuyo Koga, Makiko Shigehisa, Nami Onimaru, Koji Tsuchiya, Takanori Takiue, Hiroki Matsubara

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Aggregate formation of a didodecyldimethylammonium bromide (DDAB) and didodecyldimethylammonium chloride (DDAC) mixture in aqueous solution was investigated. The concentration vs composition diagram of aggregate formation was constructed by analyzing the surface tension, turbidity, and electrical conductivity data. The cryogenic transmission electron microscopy was applied to several representative points in the diagram and provided information of the morphology of aggregates. The sequence of monomer (m) - m + small aggregate (A) - m + A + vesicle (V) - m + V was concluded with increasing total concentration of surfactants at all mixing ratios. The compositions of counterions in A and V were estimated on the basis of thermodynamic consideration and examined from me viewpoint of asymmetry of constituents and uneven distribution between outer and inner monolayers of a vesicle bilayer. Vesicle surfaces were suggested to abound in chloride ions compared to bulk solution, which is opposite to spherical micelle surfaces.

Original languageEnglish
Pages (from-to)12304-12311
Number of pages8
JournalJournal of Physical Chemistry B
Volume112
Issue number39
DOIs
Publication statusPublished - Oct 2 2008

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Cationic surfactants
Surface-Active Agents
surfactants
Unilamellar Liposomes
Electric Conductivity
Surface Tension
Micelles
Transmission Electron Microscopy
Thermodynamics
Chlorides
chlorides
diagrams
Ions
conductivity
turbidity
Turbidity
mixing ratios
Chemical analysis
Cryogenics
cryogenics

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Spontaneous vesicle formation of mixtures of double-chain cationic surfactants with a different counterion. / Aratono, Makoto; Mori, Azusa; Koga, Ikuyo; Shigehisa, Makiko; Onimaru, Nami; Tsuchiya, Koji; Takiue, Takanori; Matsubara, Hiroki.

In: Journal of Physical Chemistry B, Vol. 112, No. 39, 02.10.2008, p. 12304-12311.

Research output: Contribution to journalArticle

Aratono, Makoto ; Mori, Azusa ; Koga, Ikuyo ; Shigehisa, Makiko ; Onimaru, Nami ; Tsuchiya, Koji ; Takiue, Takanori ; Matsubara, Hiroki. / Spontaneous vesicle formation of mixtures of double-chain cationic surfactants with a different counterion. In: Journal of Physical Chemistry B. 2008 ; Vol. 112, No. 39. pp. 12304-12311.
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