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The effect of emulsifier concentration on the lubricating properties of oil-in-water emulsions

The effect of emulsifier concentration on the lubricating properties of oil-in-water emulsions
The effect of emulsifier concentration on the lubricating properties of oil-in-water emulsions
Although the use of oil-in-water (O/W) emulsions as metalworking fluids is widespread, the mechanisms of emulsion lubrication are not yet well understood. Several theories have been proposed but there is not a clear agreement about the effect of different operating conditions and emulsion properties on the lubricating performance of O/W emulsions. In the present study, the film forming ability of O/W emulsions as a function of emulsifier concentration is studied. The emulsifier content exerts a strong influence on all the emulsion properties, such as stability, droplet size distribution, surface and interfacial tension, wetting ability, etc., as well as on the lubricating behaviour, so it has been used to ascertain the relationship between all the properties involved. Three different emulsifiers—anionic, nonionic and cationic—were used at different concentrations in the design of lubricant O/W emulsions. Experimental results show that the work of adhesion of oil droplets on the metal surface is a valuable parameter to predict the ability of emulsions to form thick films in elastohydrodynamic (EHD) contacts. The influence of pH value of O/W emulsions on their lubricating behaviour is also verified. The overall conclusion is that the interactions between metal and oil droplets rule the mechanism of lubrication and that this interaction is primarily controlled by emulsifier concentration.
1023-8883
53-65
Cambiella, A.
38e76c58-9038-42ee-b30e-7e6ae05c25ac
Benito, J.M.
133e62d2-5b2b-45d0-8508-29ff7118f846
Pazos, C.
ec2d028c-7768-4a3a-b6ea-30291bae9471
Coca, J.
0262331d-7091-4dec-9592-8e084455d5fe
Ratoi, M.
cfeffe10-31ca-4630-8399-232c4bc2beff
Spikes, H.A.
e8d32127-b018-44b9-ad78-49e446ed590e
Cambiella, A.
38e76c58-9038-42ee-b30e-7e6ae05c25ac
Benito, J.M.
133e62d2-5b2b-45d0-8508-29ff7118f846
Pazos, C.
ec2d028c-7768-4a3a-b6ea-30291bae9471
Coca, J.
0262331d-7091-4dec-9592-8e084455d5fe
Ratoi, M.
cfeffe10-31ca-4630-8399-232c4bc2beff
Spikes, H.A.
e8d32127-b018-44b9-ad78-49e446ed590e

Cambiella, A., Benito, J.M., Pazos, C., Coca, J., Ratoi, M. and Spikes, H.A. (2006) The effect of emulsifier concentration on the lubricating properties of oil-in-water emulsions. Tribology Letters, 22 (1), 53-65. (doi:10.1007/s11249-006-9072-1).

Record type: Article

Abstract

Although the use of oil-in-water (O/W) emulsions as metalworking fluids is widespread, the mechanisms of emulsion lubrication are not yet well understood. Several theories have been proposed but there is not a clear agreement about the effect of different operating conditions and emulsion properties on the lubricating performance of O/W emulsions. In the present study, the film forming ability of O/W emulsions as a function of emulsifier concentration is studied. The emulsifier content exerts a strong influence on all the emulsion properties, such as stability, droplet size distribution, surface and interfacial tension, wetting ability, etc., as well as on the lubricating behaviour, so it has been used to ascertain the relationship between all the properties involved. Three different emulsifiers—anionic, nonionic and cationic—were used at different concentrations in the design of lubricant O/W emulsions. Experimental results show that the work of adhesion of oil droplets on the metal surface is a valuable parameter to predict the ability of emulsions to form thick films in elastohydrodynamic (EHD) contacts. The influence of pH value of O/W emulsions on their lubricating behaviour is also verified. The overall conclusion is that the interactions between metal and oil droplets rule the mechanism of lubrication and that this interaction is primarily controlled by emulsifier concentration.

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Published date: 1 April 2006
Organisations: Engineering Science Unit, nCATS Group

Identifiers

Local EPrints ID: 356082
URI: http://eprints.soton.ac.uk/id/eprint/356082
ISSN: 1023-8883
PURE UUID: 9c8a4a7e-6cc7-4314-9af2-7165c7b05ed1

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Date deposited: 22 Oct 2013 13:48
Last modified: 16 Dec 2019 20:30

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