Effect of added salt on the maximum solubilization in an ionic-surfactant microemulsion

被引：43

作者：

Kunieda, H

Aoki, R

机构：

[1] Div. of Artif. Environments Systems, Graduate School of Engineering, Yokohama National University, Hodogaya-ku, Yokohama 240

来源：

LANGMUIR | 1996年 / 12卷 / 24期

关键词：

D O I：

10.1021/la960472k

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The effect of added salt on the three-phase behavior in a microemulsion system was investigated in a brine lag. NaCl/sodium dodecyl sulfate (SDS)/hexanol/dodecane system at 25 degrees C. Phase equilibrium was analyzed assuming that (1) most of the SDS molecules are at micro water-oil interfaces inside a microemulsion phase, (2) hexanol is distributed to micro-oil domains inside a microemulsion and the micro water-oil interfaces, and (3) in excess oil phase of the three-phase body, the solubility of hexanol is equal to that in micro-oil domains inside the single-phase microemulsion. The minimum concentration of mixed surfactant (SDS + hexanol) required to solubilize equal weights of water and oil in single-phase decreases with increasing salinity. The remarkable increase in solubilization at higher salinities is mainly due to the decrease in the solubility of hexanol in oil. Inside the microemulsion phase, the solubility in oil is very high and only a small portion of added hexanol forms the mixed layer with SDS molecules at low salinity. Hence, hexanol acts as a polar oil rather thane cosurfactant at low salinity.

引用

页码：5796 / 5799

页数：4

共 25 条

[1]

[Anonymous], 1953, B CHEM SOC JPN, DOI DOI 10.1246/BCSJ.26.101

[2]

BOURREL M, 1988, MICROEMULSIONS RELAT, pCH5

[3]

CORRIN ML, 1974, J AM CHEM SOC, V69, P684

[4] ISOPIESTIC COMPOSITIONS OF AQUEOUS IONIC SURFACTANT SYSTEMS AS A MEASURE OF PREFERENTIAL INTERACTIONS - APPLICATION TO THE DETERMINATION OF MICELLE AGGREGATION NUMBERS BY EQUILIBRIUM ULTRA-CENTRIFUGATION [J].

DOUGHTY, DA .

JOURNAL OF PHYSICAL CHEMISTRY, 1979, 83 (20) :2621-2628

[5] ENTHALPIES OF SOLUTION OF HEXAN-1-OL AND HEPTAN-1-OL IN WATER [J].

HILL, DJT ;

WHITE, LR .

AUSTRALIAN JOURNAL OF CHEMISTRY, 1974, 27 (09) :1905-1916

[6]

Huisman H.F., 1964, LIGHT SCATTERING SOL

[7]

Huisman H. F., 1964, KONINKL NED AKAD W B, V67, P388

[8]

HUISMAN HF, 1964, P KONINKL NED AKAD B, V67, P407

[9]

HUISMAN HF, 1964, P K NED AKAD WET B, V67, P376

[10] FORMATION OF AOT REVERSED MICELLES AND W/O MICROEMULSIONS [J].

KAWAI, T ;

HAMADA, K ;

SHINDO, N ;

KONNO, K .

BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 1992, 65 (10) :2715-2719

← 1 2 3 →