Lubricating properties of aqueous surfactant solutions
Lubricating properties of aqueous surfactant solutions
This paper describes a study of the elastohydrodynamic and boundary film-forming properties of solutions of simple surfactants in water. Such solutions are finding increasing use both as highly fire-resistant and environmentally-friendly hydraulic fluids. They also provide a vehicle to help clarify the origins of the film-forming behavior of oil-in-water emulsions.
Film formation was found to be dependent upon the type and concentration of surfactant and also on the pH of the solution. Two different types of behavior were seen. At slow speeds, mono-layer-type boundary films were observed while at higher speeds, speed-dependent elastohydrodynamic-type films were produced. The latter were formed at entrainment velocities much lower than might be predicted from the viscometric properties of the bulk surfactant solutions and were similar to films formed by some oil-in-water emulsions at high speed. They show that water is entrained into high pressure, rolling contacts in accord to the predictions of elastic isoviscous theory.
479-486
Ratoi, M.
cfeffe10-31ca-4630-8399-232c4bc2beff
Spikes, H.A.
e8d32127-b018-44b9-ad78-49e446ed590e
1 July 1999
Ratoi, M.
cfeffe10-31ca-4630-8399-232c4bc2beff
Spikes, H.A.
e8d32127-b018-44b9-ad78-49e446ed590e
Ratoi, M. and Spikes, H.A.
(1999)
Lubricating properties of aqueous surfactant solutions.
Tribology Transactions, 42 (3), .
(doi:10.1080/10402009908982244).
Abstract
This paper describes a study of the elastohydrodynamic and boundary film-forming properties of solutions of simple surfactants in water. Such solutions are finding increasing use both as highly fire-resistant and environmentally-friendly hydraulic fluids. They also provide a vehicle to help clarify the origins of the film-forming behavior of oil-in-water emulsions.
Film formation was found to be dependent upon the type and concentration of surfactant and also on the pH of the solution. Two different types of behavior were seen. At slow speeds, mono-layer-type boundary films were observed while at higher speeds, speed-dependent elastohydrodynamic-type films were produced. The latter were formed at entrainment velocities much lower than might be predicted from the viscometric properties of the bulk surfactant solutions and were similar to films formed by some oil-in-water emulsions at high speed. They show that water is entrained into high pressure, rolling contacts in accord to the predictions of elastic isoviscous theory.
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Published date: 1 July 1999
Organisations:
Engineering Mats & Surface Engineerg Gp, Fluid Structure Interactions Group
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Local EPrints ID: 66900
URI: http://eprints.soton.ac.uk/id/eprint/66900
ISSN: 1040-2004
PURE UUID: f996afcc-79f1-4bc8-b5b5-2ca652c1db73
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Date deposited: 28 Jul 2009
Last modified: 14 Mar 2024 02:55
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Author:
H.A. Spikes
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