Vesicle formation in oleyldimethylamine oxide/sodium oleate mixtures

Shimon Tanaka, Hideya Kawasaki, Masao Suzuki, Annaka Masahiko, Norio Nemoto, Mats Almgren, Hiroshi Maeda

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Vesicle formation in a mixture of oleyldimethylamine oxide (OleylDMAO) and sodium oleate (NaOl) was investigated by viscoelastic measurements and cryoscopic transmission electron micrograph (cryo-TEM) observations. The viscoelastic properties changed with increasing mole fraction of NaOl (XNaOl) from the Maxwell behavior of OleylDMAO solutions (XNaOl = 0) suggesting a transient network of long flexible chains. For XNaOl = 0.2 and 0.4 mixtures, both the shear storage modulus G′ and the shear loss modulus G″ showed weak dependences on angular frequency ω with a relation G′ > G″. From cryo-TEM observations, vesicles coexisted with threadlike micelles in mixtures of XNaOl = 0.2 and 0.3. As XNaOl increased further (XNaOl=0.5 and 0.6), threadlike micelles disappeared and the coexistence of vesicles and globular micelles was observed. At XNaOl = 0. 5, the viscosity decreased remarkably, which was consistent with the disappearance of threadlike micelles. The results indicated that vesicles were formed by the addition of NaOl to OleylDMAO solutions, contrary to the expectation of a decrease of the packing parameter with the introduction of electric charges.

Original languageEnglish
Pages (from-to)1140-1145
Number of pages6
JournalColloid and Polymer Science
Volume282
Issue number10
DOIs
Publication statusPublished - Jan 1 2004

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Colloid and Surface Chemistry
  • Materials Chemistry

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