Structure and transport properties of a charged spherical microemulsion system
(2001) In Langmuir 17(4). p.10431053 Abstract
 Structure and transport properties of an oilinwater microemulsion of weakly charged spherical micelles were studied experimentally using viscosity, NMR selfdiffusion, and static and dynamic light scattering as well as theoretically by Brownian dynamics and Monte Carlo simulations and the PoissonBoltzmann 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 surfactanttooil 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 oilinwater microemulsion of weakly charged spherical micelles were studied experimentally using viscosity, NMR selfdiffusion, and static and dynamic light scattering as well as theoretically by Brownian dynamics and Monte Carlo simulations and the PoissonBoltzmann 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 surfactanttooil 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 selfdiffusion and viscosity coefficients measured as a function of concentration showed that the system obeys the generalized StokesEinstein 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 hardsphere model with hydrodynamic interactions. Other static and dynamic properties such as osmotic pressure, osmotic compressibility, and selfdiffusion coefficient were obtained theoretically from simulations based on a chargedsphere model. The static and dynamic properties of the charged hardsphere 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
 07437463
 DOI
 10.1021/la0011883
 language
 English
 LU publication?
 yes
 id
 6a40c61bf98d4c519d165be663981f7a (old id 947791)
 date added to LUP
 20160401 11:54:38
 date last changed
 20201208 03:23:22
@article{6a40c61bf98d4c519d165be663981f7a, abstract = {Structure and transport properties of an oilinwater microemulsion of weakly charged spherical micelles were studied experimentally using viscosity, NMR selfdiffusion, and static and dynamic light scattering as well as theoretically by Brownian dynamics and Monte Carlo simulations and the PoissonBoltzmann 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 surfactanttooil 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 selfdiffusion and viscosity coefficients measured as a function of concentration showed that the system obeys the generalized StokesEinstein 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 hardsphere model with hydrodynamic interactions. Other static and dynamic properties such as osmotic pressure, osmotic compressibility, and selfdiffusion coefficient were obtained theoretically from simulations based on a chargedsphere model. The static and dynamic properties of the charged hardsphere 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 = {07437463}, language = {eng}, number = {4}, pages = {10431053}, 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}, }