Reference : Adsorption of an aqueous mixture of surfactants on silica
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Chemistry
Engineering, computing & technology : Materials science & engineering
http://hdl.handle.net/2268/14780
Adsorption of an aqueous mixture of surfactants on silica
English
Thibaut, Anne [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
Misselyn-Bauduin, Anne-Marie [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
Grandjean, Jean mailto [University of Liège (ULg) > Department of Chemistry > Chimie Fine aux Interfaces > >]
Broze, Guy [Colgate-Palmolive R&D > > > >]
Jérôme, Robert mailto [University of Liège (ULg) > Depatment of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
28-Nov-2000
Langmuir
Amer Chemical Soc
16
24
9192-9198
Yes (verified by ORBi)
International
0743-7463
Washington
[en] coating
[en] The behavior of mixtures of a nonionic surfactant, pentaethylene glycol monodecyl ether (C10E5), and an anionic surfactant, sodium dodecyl sulfate (SDS), was studied at the water−silica interface. In contrast to the C10E5 surfactant, which is adsorbed at the silica−water interface at pH 6, the adsorption of the anionic surfactant is not observed. In the presence of SDS, the adsorption of C10E5 is severely restricted as result of the formation of mixed micelles in solution. This behavior is consistent with the adsorption free energy, ΔGads, of C10E5 and the free energy of mixed micellization, ΔGmix.mic, of SDS and C10E5. Flow microcalorimetry (FMC) results showed that the addition of C10E5/SDS mixtures to silica precoated with C10E5 resulted in the release of the preadsorbed nonionic surfactant; the whole phenomenon is exothermic. Combination of calorimetric data (FMC and isothermal titration calorimetry), self-diffusion coefficients, and the regular solution theory led to the conclusion that the main driving force for the C10E5 desorption was the formation of mixed micelles by unimeric SDS and the released nonionic surfactant.
Center for Education and Research on Macromolecules (CERM)
Politique Scientifique Fédérale (Belgique) = Belgian Federal Science Policy ; Colgate-Palmolive
Researchers
http://hdl.handle.net/2268/14780
10.1021/la000302e
http://pubs.acs.org/doi/pdf/10.1021/la000302e

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