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Molecular transport in a nonequilibrium droplet microemulsion system.

Evilevitch, Alex LU ; Jönsson, Bengt LU ; Olsson, Ulf LU and Wennerström, Håkan LU (2001) In Langmuir 17(22). p.6893-6904
Abstract
In this paper, we consider the problem of oil molecular transport between nonequilibrium microemulsion oil droplets in water. In particular, we have investigated the kinetics of solubilization of big oil drops by smaller microemulsion droplets transforming a bimodal size distribution into an equilibrium microemulsion with a unimodal size distribution. The process involves the diffusion of oil monomers across the aqueous solvent. Solubilization experiments are presented on a well-characterized nonionic microemulsion system, where interfacial area and dispersed volume are conserved and where the excess oil chemical potential is dominated by interfacial curvature energy. An analysis of the experiments shows that the solubilization kinetics... (More)
In this paper, we consider the problem of oil molecular transport between nonequilibrium microemulsion oil droplets in water. In particular, we have investigated the kinetics of solubilization of big oil drops by smaller microemulsion droplets transforming a bimodal size distribution into an equilibrium microemulsion with a unimodal size distribution. The process involves the diffusion of oil monomers across the aqueous solvent. Solubilization experiments are presented on a well-characterized nonionic microemulsion system, where interfacial area and dispersed volume are conserved and where the excess oil chemical potential is dominated by interfacial curvature energy. An analysis of the experiments shows that the solubilization kinetics depend significantly on the concentrations and sizes of big and small droplets. We formulate a quantitative model for the solubilization kinetics where the effects of size and concentrations are treated within the framework of a cell model. A quantitative agreement between model and experiment is obtained, and the analysis also shows that the majority of oil monomers are captured by small droplets already in the vicinity of the big drop surface when the concentration of small droplets is high. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Langmuir
volume
17
issue
22
pages
6893 - 6904
publisher
The American Chemical Society
external identifiers
  • scopus:0035976191
ISSN
0743-7463
DOI
10.1021/la010899d
language
English
LU publication?
yes
id
6f4f3415-38aa-49ca-8048-2702b0dd7210 (old id 947755)
date added to LUP
2008-01-24 17:28:03
date last changed
2018-05-29 10:10:18
@article{6f4f3415-38aa-49ca-8048-2702b0dd7210,
  abstract     = {In this paper, we consider the problem of oil molecular transport between nonequilibrium microemulsion oil droplets in water. In particular, we have investigated the kinetics of solubilization of big oil drops by smaller microemulsion droplets transforming a bimodal size distribution into an equilibrium microemulsion with a unimodal size distribution. The process involves the diffusion of oil monomers across the aqueous solvent. Solubilization experiments are presented on a well-characterized nonionic microemulsion system, where interfacial area and dispersed volume are conserved and where the excess oil chemical potential is dominated by interfacial curvature energy. An analysis of the experiments shows that the solubilization kinetics depend significantly on the concentrations and sizes of big and small droplets. We formulate a quantitative model for the solubilization kinetics where the effects of size and concentrations are treated within the framework of a cell model. A quantitative agreement between model and experiment is obtained, and the analysis also shows that the majority of oil monomers are captured by small droplets already in the vicinity of the big drop surface when the concentration of small droplets is high.},
  author       = {Evilevitch, Alex and Jönsson, Bengt and Olsson, Ulf and Wennerström, Håkan},
  issn         = {0743-7463},
  language     = {eng},
  number       = {22},
  pages        = {6893--6904},
  publisher    = {The American Chemical Society},
  series       = {Langmuir},
  title        = {Molecular transport in a nonequilibrium droplet microemulsion system.},
  url          = {http://dx.doi.org/10.1021/la010899d},
  volume       = {17},
  year         = {2001},
}