Nanotribology, standard friction, and bulk rheology properties compared for a Brij microemulsion

Graca, M., Bongaerts, J. H. H., Stokes, J. R. and Granick, S. (2009) Nanotribology, standard friction, and bulk rheology properties compared for a Brij microemulsion. Journal of Colloid and Interface Science, 333 2: 628-634. doi:10.1016/j.jcis.2009.01.051

Author Graca, M.
Bongaerts, J. H. H.
Stokes, J. R.
Granick, S.
Title Nanotribology, standard friction, and bulk rheology properties compared for a Brij microemulsion
Journal name Journal of Colloid and Interface Science   Check publisher's open access policy
ISSN 0021-9797
Publication date 2009-01-01
Year available 2009
Sub-type Article (original research)
DOI 10.1016/j.jcis.2009.01.051
Open Access Status Not yet assessed
Volume 333
Issue 2
Start page 628
End page 634
Total pages 7
Editor Darsh T Wasan
Place of publication New York
Publisher Academic Press
Language eng
Subject C1
0904 Chemical Engineering
8606 Industrial Chemicals and Related Products
Abstract A microemulsion consisting of Brij 96, glycerol (co-surfactant), oil, and water was compared as concerns deformations in a surface forces apparatus whose surface where rendered hydrophobic by coating with a monolayer of condensed CITE (octadecyltriethoxysilane), as concerns tribology of the conventional kind during sliding between hydrophobic PDMS surfaces, and as concerns bulk theology. In the bulk, light scattering characterization showed swollen spherical micelles with a 13 nm diameter, When squeezed to form thinner films than this, the effective viscosity measured rose by orders of magnitude. It appears that thin films in the range of thickness 13 to 7 nm are comprised of deformed micelles and that confinement to thinner films expels micelles with concomitant even more drastic structural deformation of the remaining micelles, until the thinnest films retain only adsorbed surfactant. Tentatively, this may explain why the friction response then became similar to that of surfactant itself [M. Graca, J.H.H. Bongaerts, J.R. Stokes, S. Granick, J. Colloid Interface Sci. 315 (2007) 662]. These measurements are considered to be the first comparison of microemulsion theology in the bulk and in nanometer-thick films. (C) 2009 Elsevier Inc. All rights reserved.
Keyword Microemulsion
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID NSF-CMS-05-55820
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
School of Chemical Engineering Publications
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Citation counts: TR Web of Science Citation Count  Cited 9 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 10 times in Scopus Article | Citations
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Created: Thu, 02 Jul 2009, 02:04:28 EST