Effects of micelle-to-vesicle transitions on the degree of counterion binding

Yousuke Ono, Hideya Kawasaki, Annaka Masahiko, Hiroshi Maeda

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Effects of micelle-to-vesicle transitions on the degree of counterion binding (β) were investigated on three systems. For the concentration-dependent micelle-to-vesicle transition in the didodecyldimethylammonium bromide (DDAB)/water system, in the region of coexistent micelles and vesicles, less than 3 mM, the β values increased significantly with DDAB concentration: β (0.07 mM) = 0.35 and β (3 mM) = 0.93. In the coexistent region, activities of the bromide ion, aBr, were almost independent of the DDAB concentration, suggesting the pseudo-phase nature of both micelles and vesicles. In the concentration-dependent vesicle-to-lamellar transition region above 5 mM, where multilamellar vesicles were prevailing, on the other hand, the β values were only little affected by this transition. This suggests that the increase in the layer number of DDAB multilamellar vesicles scarcely affects the β values. This was also supported by the fact that the destruction of multilamellar vesicles by ultrasonication did not change the β values. These results strongly suggest that the inner and outer monolayers of DDAB multilamellar vesicles are characterized by similar β values. The second system, cetyltrimethylammonium bromide (CTAB)/DDAB mixtures, showed composition- dependent transitions depending on the mole fraction of DDAB XDDAB: spherical micelles (0<XDDAB<0.2)→rodlike micelles (0.2<XDDAB<0.4) →vesicles (0.6<XDDAB<1). Values of β increased with both the sphere-to-rodlike micelle transition and the micelle-to-vesicle transition. The increase in the β value was larger for the latter than for the former transition. Little effects of ultrasonication on β was also observed for the multilamellar vesicles of CTAB/DDAB mixtures. In the third system of the mixtures of two single chain surfactants, protonated and non-protonated of oleyldimethylamine oxide, the dependence of β on the degree of ionization (α) can be well described with a theoretical curve, derived on the basis of the linear relation between the surface charge density and the α value, despite the occurrence of the micelle-to-vesicle transition.

Original languageEnglish
Pages (from-to)685-693
Number of pages9
JournalJournal of Colloid And Interface Science
Volume287
Issue number2
DOIs
Publication statusPublished - Jul 15 2005

Fingerprint

Micelles
didodecyldimethylammonium
Surface charge
Charge density
Bromides
Surface-Active Agents
Oxides
Ionization
Monolayers
Surface active agents
Ions
Water
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

Cite this

Effects of micelle-to-vesicle transitions on the degree of counterion binding. / Ono, Yousuke; Kawasaki, Hideya; Masahiko, Annaka; Maeda, Hiroshi.

In: Journal of Colloid And Interface Science, Vol. 287, No. 2, 15.07.2005, p. 685-693.

Research output: Contribution to journalArticle

Ono, Yousuke ; Kawasaki, Hideya ; Masahiko, Annaka ; Maeda, Hiroshi. / Effects of micelle-to-vesicle transitions on the degree of counterion binding. In: Journal of Colloid And Interface Science. 2005 ; Vol. 287, No. 2. pp. 685-693.
@article{7e35503731464531a9332a7079a38406,
title = "Effects of micelle-to-vesicle transitions on the degree of counterion binding",
abstract = "Effects of micelle-to-vesicle transitions on the degree of counterion binding (β) were investigated on three systems. For the concentration-dependent micelle-to-vesicle transition in the didodecyldimethylammonium bromide (DDAB)/water system, in the region of coexistent micelles and vesicles, less than 3 mM, the β values increased significantly with DDAB concentration: β (0.07 mM) = 0.35 and β (3 mM) = 0.93. In the coexistent region, activities of the bromide ion, aBr, were almost independent of the DDAB concentration, suggesting the pseudo-phase nature of both micelles and vesicles. In the concentration-dependent vesicle-to-lamellar transition region above 5 mM, where multilamellar vesicles were prevailing, on the other hand, the β values were only little affected by this transition. This suggests that the increase in the layer number of DDAB multilamellar vesicles scarcely affects the β values. This was also supported by the fact that the destruction of multilamellar vesicles by ultrasonication did not change the β values. These results strongly suggest that the inner and outer monolayers of DDAB multilamellar vesicles are characterized by similar β values. The second system, cetyltrimethylammonium bromide (CTAB)/DDAB mixtures, showed composition- dependent transitions depending on the mole fraction of DDAB XDDAB: spherical micelles (0<XDDAB<0.2)→rodlike micelles (0.2<XDDAB<0.4) →vesicles (0.6<XDDAB<1). Values of β increased with both the sphere-to-rodlike micelle transition and the micelle-to-vesicle transition. The increase in the β value was larger for the latter than for the former transition. Little effects of ultrasonication on β was also observed for the multilamellar vesicles of CTAB/DDAB mixtures. In the third system of the mixtures of two single chain surfactants, protonated and non-protonated of oleyldimethylamine oxide, the dependence of β on the degree of ionization (α) can be well described with a theoretical curve, derived on the basis of the linear relation between the surface charge density and the α value, despite the occurrence of the micelle-to-vesicle transition.",
author = "Yousuke Ono and Hideya Kawasaki and Annaka Masahiko and Hiroshi Maeda",
year = "2005",
month = "7",
day = "15",
doi = "10.1016/j.jcis.2005.02.021",
language = "English",
volume = "287",
pages = "685--693",
journal = "Journal of Colloid and Interface Science",
issn = "0021-9797",
publisher = "Academic Press Inc.",
number = "2",

}

TY - JOUR

T1 - Effects of micelle-to-vesicle transitions on the degree of counterion binding

AU - Ono, Yousuke

AU - Kawasaki, Hideya

AU - Masahiko, Annaka

AU - Maeda, Hiroshi

PY - 2005/7/15

Y1 - 2005/7/15

N2 - Effects of micelle-to-vesicle transitions on the degree of counterion binding (β) were investigated on three systems. For the concentration-dependent micelle-to-vesicle transition in the didodecyldimethylammonium bromide (DDAB)/water system, in the region of coexistent micelles and vesicles, less than 3 mM, the β values increased significantly with DDAB concentration: β (0.07 mM) = 0.35 and β (3 mM) = 0.93. In the coexistent region, activities of the bromide ion, aBr, were almost independent of the DDAB concentration, suggesting the pseudo-phase nature of both micelles and vesicles. In the concentration-dependent vesicle-to-lamellar transition region above 5 mM, where multilamellar vesicles were prevailing, on the other hand, the β values were only little affected by this transition. This suggests that the increase in the layer number of DDAB multilamellar vesicles scarcely affects the β values. This was also supported by the fact that the destruction of multilamellar vesicles by ultrasonication did not change the β values. These results strongly suggest that the inner and outer monolayers of DDAB multilamellar vesicles are characterized by similar β values. The second system, cetyltrimethylammonium bromide (CTAB)/DDAB mixtures, showed composition- dependent transitions depending on the mole fraction of DDAB XDDAB: spherical micelles (0<XDDAB<0.2)→rodlike micelles (0.2<XDDAB<0.4) →vesicles (0.6<XDDAB<1). Values of β increased with both the sphere-to-rodlike micelle transition and the micelle-to-vesicle transition. The increase in the β value was larger for the latter than for the former transition. Little effects of ultrasonication on β was also observed for the multilamellar vesicles of CTAB/DDAB mixtures. In the third system of the mixtures of two single chain surfactants, protonated and non-protonated of oleyldimethylamine oxide, the dependence of β on the degree of ionization (α) can be well described with a theoretical curve, derived on the basis of the linear relation between the surface charge density and the α value, despite the occurrence of the micelle-to-vesicle transition.

AB - Effects of micelle-to-vesicle transitions on the degree of counterion binding (β) were investigated on three systems. For the concentration-dependent micelle-to-vesicle transition in the didodecyldimethylammonium bromide (DDAB)/water system, in the region of coexistent micelles and vesicles, less than 3 mM, the β values increased significantly with DDAB concentration: β (0.07 mM) = 0.35 and β (3 mM) = 0.93. In the coexistent region, activities of the bromide ion, aBr, were almost independent of the DDAB concentration, suggesting the pseudo-phase nature of both micelles and vesicles. In the concentration-dependent vesicle-to-lamellar transition region above 5 mM, where multilamellar vesicles were prevailing, on the other hand, the β values were only little affected by this transition. This suggests that the increase in the layer number of DDAB multilamellar vesicles scarcely affects the β values. This was also supported by the fact that the destruction of multilamellar vesicles by ultrasonication did not change the β values. These results strongly suggest that the inner and outer monolayers of DDAB multilamellar vesicles are characterized by similar β values. The second system, cetyltrimethylammonium bromide (CTAB)/DDAB mixtures, showed composition- dependent transitions depending on the mole fraction of DDAB XDDAB: spherical micelles (0<XDDAB<0.2)→rodlike micelles (0.2<XDDAB<0.4) →vesicles (0.6<XDDAB<1). Values of β increased with both the sphere-to-rodlike micelle transition and the micelle-to-vesicle transition. The increase in the β value was larger for the latter than for the former transition. Little effects of ultrasonication on β was also observed for the multilamellar vesicles of CTAB/DDAB mixtures. In the third system of the mixtures of two single chain surfactants, protonated and non-protonated of oleyldimethylamine oxide, the dependence of β on the degree of ionization (α) can be well described with a theoretical curve, derived on the basis of the linear relation between the surface charge density and the α value, despite the occurrence of the micelle-to-vesicle transition.

UR - http://www.scopus.com/inward/record.url?scp=19844383861&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=19844383861&partnerID=8YFLogxK

U2 - 10.1016/j.jcis.2005.02.021

DO - 10.1016/j.jcis.2005.02.021

M3 - Article

VL - 287

SP - 685

EP - 693

JO - Journal of Colloid and Interface Science

JF - Journal of Colloid and Interface Science

SN - 0021-9797

IS - 2

ER -