Stable, metastable and unstable oil-in-water droplets

被引：12

作者：

Olsson, U ^{[1
]}

Bagger-Jorgensen, H ^{[1
]}

Leaver, M ^{[1
]}

Morris, J ^{[1
]}

Mortensen, K ^{[1
]}

Strey, R ^{[1
]}

Schurtenberger, P ^{[1
]}

Wennerstrom, H ^{[1
]}

机构：

[1] Univ Lund, Ctr Chem & Chem Engn, S-22100 Lund, Sweden

来源：

FORMATION AND DYNAMICS OF SELF-ORGANIZED STRUCTURES IN SURFACTANTS AND POLYMER SOLUTIONS | 1997年 / 106卷

关键词：

microemulsion; hard sphere; metastability; nucleation;

D O I：

10.1007/BF01189484

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this paper we bring together some recent results concerning the stability and properties of O/W microemulsion droplets in a ternary system composed of water, decane and the nonionic surfactant pentaethylene glycol dodecylether (C12E5). Stable microemulsion droplets can be prepared when the spontaneous curvature has a finite but not too low value. Near the limit of maximum oil solubilisation the droplets adopt a spherical shape with low poly-dispersity. Experimental results obtained from low shear viscosity, collective and long time self-diffusion and static light scattering show that the spherical droplets interact to a very good approximation as hard spheres over a large range of volume fractions, A supersaturated microemulsion can be prepared by a rapid temperature quench (drop) into the two-phase area where a smaller droplet size coexists with excess oil. In the two-phase area, we can distinguish a region near the microemulsion phase boundary where the droplets are metastable, from a region further away from the boundary where the droplets are unstable and the oil-phase nucleates instantaneously. Treating the Initial phase separation as a homogeneous nucleation it is possible to calculate an activation energy within the curvature energy approach.

引用

页码：6 / 13

页数：8

共 26 条

[1]

Olsson U., Wennerstrom H., Adv Colloid Interface Sci, 49, pp. 113-146, (1994)

[2]

Safran S.A., Statistical Thermodynamics of Surfaces, Interfaces, and Membrances, (1994)

[3]

Olsson U., Schurtenberger P., Langmuir, 9, pp. 3389-3394, (1993)

[4]

Leaver M.S., Olsson U., Langmuir, 10, pp. 3449-3454, (1994)

[5]

Bagger-Jorgensen H., Olsson U., Mortensen K., Langmuir, 13, pp. 1413-1421, (1997)

[6]

Helfrich W., Z Naturforsch, 28 C, pp. 693-703, (1973)

[7]

Pieruschka P., Safran S.A., Europhys Lett, 22, pp. 625-630, (1993)

[8]

Porte G., Appell J., Bassereau P., Marignan L., J Phys France, 50, pp. 1335-1347, (1989)

[9]

Porte G., Delsant M., Billard I., Skouri M., Appell J., Marignan J., Debeauvais F., J Phys France II, 1, pp. 1101-1120, (1991)

[10]

Daicic J., Olsson U., Wennerstrom H., Jerke G., Schurtenberger P., J Phys II France, 5, pp. 199-215, (1995)

← 1 2 3 →