Spontaneous vesicle formation of single chain and double chain cationic surfactant mixtures

Makoto Aratono, Nami Onimaru, Yumi Yoshikai, Makiko Shigehisa, Ikuyo Koga, Kanda Wongwailikhit, Akio Ohta, Takanori Takiue, Belkoura Lhoussaine, Reinhard Strey, Youich Takata, Masumi Villeneuve, Hiroki Matsubara

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)


The concentration vs composition diagram of aggregate formation of the dodecyltrimethylammonium bromide (DTAB) and didodecyldimethylammonium bromide (DDAB) mixture in aqueous solution at rather dilute region was constructed by analyzing the surface tension, turbidity, and electrical conductivity data and inspected by cryo-TEM images and dynamic light scattering data. Although the aqueous solution of DTAB forms only micelles, the transition from monomer to small aggregates and then to vesicle was found at 0.1 < X2 ≤ 1, where X2 is the mole fraction of DDAB in the DTAB-DDAB mixture, while vesicle particles were formed directly from monomer solution at 0 < X2 < 0.1. Furthermore, the transition from vesicle to micelle was found at 0 < X2 < 0.4 at higher concentrations. An addition of DTAB to DDAB solution lowered considerably the DDAB concentration of the vesicle formation, which is attributable to asymmetric distribution of DTAB molecules between inner and outer monolayers of the vesicle bilayer. The shape and size of aggregates were obtained from surface tension, cryo-TEM, and light scattering data.

Original languageEnglish
Pages (from-to)107-115
Number of pages9
JournalJournal of Physical Chemistry B
Issue number1
Publication statusPublished - Jan 11 2007

All Science Journal Classification (ASJC) codes

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


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