Structure and transport properties of a charged spherical microemulsion system
(2001) In Langmuir 17(4). p.1043-1053- Abstract
- Structure and transport properties of an oil-in-water microemulsion of weakly charged spherical micelles were studied experimentally using viscosity, NMR self-diffusion, and static and dynamic light scattering as well as theoretically by Brownian dynamics and Monte Carlo simulations and the Poisson-Boltzmann equation. The micelles contain decane covered by the nonionic surfactant pentaethylene glycol dodecyl ether (C12E5) and the ionic surfactant sodium dodecyl sulfate. The system has a constant surfactant-to-oil ratio, and the total volume fraction of surfactant and oil, , is varied between 0.01 0.46. The micelles were made weakly charged by replacing a small fraction (0.01, 0.04, and 0.06) of the nonionic surfactant with ionic... (More)
- Structure and transport properties of an oil-in-water microemulsion of weakly charged spherical micelles were studied experimentally using viscosity, NMR self-diffusion, and static and dynamic light scattering as well as theoretically by Brownian dynamics and Monte Carlo simulations and the Poisson-Boltzmann equation. The micelles contain decane covered by the nonionic surfactant pentaethylene glycol dodecyl ether (C12E5) and the ionic surfactant sodium dodecyl sulfate. The system has a constant surfactant-to-oil ratio, and the total volume fraction of surfactant and oil, , is varied between 0.01 0.46. The micelles were made weakly charged by replacing a small fraction (0.01, 0.04, and 0.06) of the nonionic surfactant with ionic surfactant, retaining the micellar size. Comparison between self-diffusion and viscosity coefficients measured as a function of concentration showed that the system obeys the generalized Stokes-Einstein relation at lower micellar concentrations. At higher micellar concentrations, a slightly modified equation can be used upon the addition of an extra frictional factor due to stronger interactions. The collective diffusion coefficient shows a maximum as a function of the volume fraction. This result is in good agreement with predictions based on a charged hard-sphere model with hydrodynamic interactions. Other static and dynamic properties such as osmotic pressure, osmotic compressibility, and self-diffusion coefficient were obtained theoretically from simulations based on a charged-sphere model. The static and dynamic properties of the charged hard-sphere model qualitatively describe the behavior of the charged microemulsion micelles. At high volume fractions, > 0.1, the agreement is quantitative, but at < 0.1 the effect of the charge is smaller than what is predicted from the model. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/947791
- author
- Evilevitch, Alex
LU
; Lobaskin, V. ; Linse, Per LU ; Olsson, Ulf LU and Schurtenberger, Peter
- organization
- publishing date
- 2001
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Langmuir
- volume
- 17
- issue
- 4
- pages
- 1043 - 1053
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- scopus:0035249617
- ISSN
- 0743-7463
- DOI
- 10.1021/la0011883
- language
- English
- LU publication?
- yes
- id
- 6a40c61b-f98d-4c51-9d16-5be663981f7a (old id 947791)
- date added to LUP
- 2016-04-01 11:54:38
- date last changed
- 2025-04-04 14:17:30
@article{6a40c61b-f98d-4c51-9d16-5be663981f7a, abstract = {{Structure and transport properties of an oil-in-water microemulsion of weakly charged spherical micelles were studied experimentally using viscosity, NMR self-diffusion, and static and dynamic light scattering as well as theoretically by Brownian dynamics and Monte Carlo simulations and the Poisson-Boltzmann equation. The micelles contain decane covered by the nonionic surfactant pentaethylene glycol dodecyl ether (C12E5) and the ionic surfactant sodium dodecyl sulfate. The system has a constant surfactant-to-oil ratio, and the total volume fraction of surfactant and oil, , is varied between 0.01 0.46. The micelles were made weakly charged by replacing a small fraction (0.01, 0.04, and 0.06) of the nonionic surfactant with ionic surfactant, retaining the micellar size. Comparison between self-diffusion and viscosity coefficients measured as a function of concentration showed that the system obeys the generalized Stokes-Einstein relation at lower micellar concentrations. At higher micellar concentrations, a slightly modified equation can be used upon the addition of an extra frictional factor due to stronger interactions. The collective diffusion coefficient shows a maximum as a function of the volume fraction. This result is in good agreement with predictions based on a charged hard-sphere model with hydrodynamic interactions. Other static and dynamic properties such as osmotic pressure, osmotic compressibility, and self-diffusion coefficient were obtained theoretically from simulations based on a charged-sphere model. The static and dynamic properties of the charged hard-sphere model qualitatively describe the behavior of the charged microemulsion micelles. At high volume fractions, > 0.1, the agreement is quantitative, but at < 0.1 the effect of the charge is smaller than what is predicted from the model.}}, author = {{Evilevitch, Alex and Lobaskin, V. and Linse, Per and Olsson, Ulf and Schurtenberger, Peter}}, issn = {{0743-7463}}, language = {{eng}}, number = {{4}}, pages = {{1043--1053}}, publisher = {{The American Chemical Society (ACS)}}, series = {{Langmuir}}, title = {{Structure and transport properties of a charged spherical microemulsion system}}, url = {{http://dx.doi.org/10.1021/la0011883}}, doi = {{10.1021/la0011883}}, volume = {{17}}, year = {{2001}}, }