Abstract
We studied the effects of the degree of ionization(α) and the surfactant concentration (C d) on the micelle-vesicle transition in salt-free oleyldimethylamine oxide (OlDMAO) aqueous solutions by the dynamic light scattering (DLS), the hydrogen ion titration, the small angle neutron scattering (SANS), the electrophoretic light scattering (ELS) and viscoelastic measurements. From the study of ionization effects, the micelle-vesicle transition was recognized as a change of aggregate size by the DLS measurement; however, the micelle-vesicle transition was not detected both in the ELS measurement and the hydrogen ion titration, suggesting that the electric properties of the worm-like micelles and the vesicles are very similar despite a large difference of shapes between them. From the results of the SANS, the DLS and the viscosity measurements, it was suggested that a concentration-dependent micelle-vesicle transition took place around C p = 10 mmol kg -1 for the solutions at α = 0.5. In the concentration-range 10 mmol kg -1 < C d < 150 mmol kg -1, the micelles and the vesicles coexisted. In the concentration region (C d = 10-50 mmol kg -1), the vesicle size increased with the surfactant concentration.
| Original language | English |
|---|---|
| Pages (from-to) | 131-138 |
| Number of pages | 8 |
| Journal | Colloids and Surfaces B: Biointerfaces |
| Volume | 38 |
| Issue number | 3-4 SPEC. ISS. |
| DOIs | |
| Publication status | Published - Nov 15 2004 |
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All Science Journal Classification (ASJC) codes
- Biotechnology
- Surfaces and Interfaces
- Physical and Theoretical Chemistry
- Colloid and Surface Chemistry
Cite this
Micelle-vesicle transition of oleyldimethylamine oxide in water. / Miyahara, Masahiko; Kawasaki, Hideya; Garamus, Vasil M.; Nemoto, Norio; Kakehashi, Rie; Tanaka, Shimon; Masahiko, Annaka; Maeda, Hiroshi.
In: Colloids and Surfaces B: Biointerfaces, Vol. 38, No. 3-4 SPEC. ISS., 15.11.2004, p. 131-138.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Micelle-vesicle transition of oleyldimethylamine oxide in water
AU - Miyahara, Masahiko
AU - Kawasaki, Hideya
AU - Garamus, Vasil M.
AU - Nemoto, Norio
AU - Kakehashi, Rie
AU - Tanaka, Shimon
AU - Masahiko, Annaka
AU - Maeda, Hiroshi
PY - 2004/11/15
Y1 - 2004/11/15
N2 - We studied the effects of the degree of ionization(α) and the surfactant concentration (C d) on the micelle-vesicle transition in salt-free oleyldimethylamine oxide (OlDMAO) aqueous solutions by the dynamic light scattering (DLS), the hydrogen ion titration, the small angle neutron scattering (SANS), the electrophoretic light scattering (ELS) and viscoelastic measurements. From the study of ionization effects, the micelle-vesicle transition was recognized as a change of aggregate size by the DLS measurement; however, the micelle-vesicle transition was not detected both in the ELS measurement and the hydrogen ion titration, suggesting that the electric properties of the worm-like micelles and the vesicles are very similar despite a large difference of shapes between them. From the results of the SANS, the DLS and the viscosity measurements, it was suggested that a concentration-dependent micelle-vesicle transition took place around C p = 10 mmol kg -1 for the solutions at α = 0.5. In the concentration-range 10 mmol kg -1 < C d < 150 mmol kg -1, the micelles and the vesicles coexisted. In the concentration region (C d = 10-50 mmol kg -1), the vesicle size increased with the surfactant concentration.
AB - We studied the effects of the degree of ionization(α) and the surfactant concentration (C d) on the micelle-vesicle transition in salt-free oleyldimethylamine oxide (OlDMAO) aqueous solutions by the dynamic light scattering (DLS), the hydrogen ion titration, the small angle neutron scattering (SANS), the electrophoretic light scattering (ELS) and viscoelastic measurements. From the study of ionization effects, the micelle-vesicle transition was recognized as a change of aggregate size by the DLS measurement; however, the micelle-vesicle transition was not detected both in the ELS measurement and the hydrogen ion titration, suggesting that the electric properties of the worm-like micelles and the vesicles are very similar despite a large difference of shapes between them. From the results of the SANS, the DLS and the viscosity measurements, it was suggested that a concentration-dependent micelle-vesicle transition took place around C p = 10 mmol kg -1 for the solutions at α = 0.5. In the concentration-range 10 mmol kg -1 < C d < 150 mmol kg -1, the micelles and the vesicles coexisted. In the concentration region (C d = 10-50 mmol kg -1), the vesicle size increased with the surfactant concentration.
UR - http://www.scopus.com/inward/record.url?scp=8144223701&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=8144223701&partnerID=8YFLogxK
U2 - 10.1016/j.colsurfb.2004.04.011
DO - 10.1016/j.colsurfb.2004.04.011
M3 - Article
C2 - 15542314
AN - SCOPUS:8144223701
VL - 38
SP - 131
EP - 138
JO - Colloids and Surfaces B: Biointerfaces
JF - Colloids and Surfaces B: Biointerfaces
SN - 0927-7765
IS - 3-4 SPEC. ISS.
ER -