Friction reduction in low-load hydrodynamic lubrication with a hydrophobic surface
Friction reduction in low-load hydrodynamic lubrication with a hydrophobic surface
A novel tribometer capable of measuring low friction forces and low loads at high speeds has been employed to measure the friction coefficient in a pure sliding, ball-on-flat contact in hydrodynamic lubrication conditions. The tribometer was custom-built for measuring friction at low loads, to allow the authors to investigate the feasibility of using the liquid-slip phenomenon for the lubrication of high-sliding MEMS. The theory behind lubrication with liquid slip and its effect on friction is briefly discussed. Contacting surfaces were treated to create hydrophobic/hydrophilic or hydrophilic/hydrophilic pairs. Hydrophobic surfaces were made by coating mica with a self-assembled silane monolayer while the hydrophilic surfaces used were freshly cleaved mica and plasma-cleaned steel. Experiments were conducted at sliding speeds of up to 2 m/s and loads below 0.2 N. An aqueous glycerol solution was used as lubricant. Results obtained with hydrophilic/hydrophilic surfaces were in accord with hydrodynamic lubrication theory. Tests with hydrophobic/hydrophilic surfaces revealed a reduction in friction, which may be attributed to lubricant slip against the hydrophobic surface.
friction measurement, hydrodynamic lubrication, hydrophobic coating
154-159
Choo, J.H.
deb9f442-6e15-4d56-ad0f-043ebf6791bb
Spikes, H.A.
e8d32127-b018-44b9-ad78-49e446ed590e
Ratoi, M.
cfeffe10-31ca-4630-8399-232c4bc2beff
Glovnea, R.
05a0e302-eda9-4999-aa6e-7c2bb6e67236
Forrest, A.
c1aeeffa-914d-45e8-ac7a-6e567b8bf59e
February 2007
Choo, J.H.
deb9f442-6e15-4d56-ad0f-043ebf6791bb
Spikes, H.A.
e8d32127-b018-44b9-ad78-49e446ed590e
Ratoi, M.
cfeffe10-31ca-4630-8399-232c4bc2beff
Glovnea, R.
05a0e302-eda9-4999-aa6e-7c2bb6e67236
Forrest, A.
c1aeeffa-914d-45e8-ac7a-6e567b8bf59e
Choo, J.H., Spikes, H.A., Ratoi, M., Glovnea, R. and Forrest, A.
(2007)
Friction reduction in low-load hydrodynamic lubrication with a hydrophobic surface.
[in special issue: First International Conference on Advanced Tribology (iCAT 2004)]
Tribology International, 40 (2), .
(doi:10.1016/j.triboint.2005.09.006).
Abstract
A novel tribometer capable of measuring low friction forces and low loads at high speeds has been employed to measure the friction coefficient in a pure sliding, ball-on-flat contact in hydrodynamic lubrication conditions. The tribometer was custom-built for measuring friction at low loads, to allow the authors to investigate the feasibility of using the liquid-slip phenomenon for the lubrication of high-sliding MEMS. The theory behind lubrication with liquid slip and its effect on friction is briefly discussed. Contacting surfaces were treated to create hydrophobic/hydrophilic or hydrophilic/hydrophilic pairs. Hydrophobic surfaces were made by coating mica with a self-assembled silane monolayer while the hydrophilic surfaces used were freshly cleaved mica and plasma-cleaned steel. Experiments were conducted at sliding speeds of up to 2 m/s and loads below 0.2 N. An aqueous glycerol solution was used as lubricant. Results obtained with hydrophilic/hydrophilic surfaces were in accord with hydrodynamic lubrication theory. Tests with hydrophobic/hydrophilic surfaces revealed a reduction in friction, which may be attributed to lubricant slip against the hydrophobic surface.
Text
Friction Reduction in a Low Load Hydrodynamic Lubrication with a Hydrophobic Surface.pdf
- Version of Record
Restricted to Repository staff only
Request a copy
More information
e-pub ahead of print date: 23 March 2006
Published date: February 2007
Keywords:
friction measurement, hydrodynamic lubrication, hydrophobic coating
Organisations:
nCATS Group
Identifiers
Local EPrints ID: 356079
URI: http://eprints.soton.ac.uk/id/eprint/356079
ISSN: 0301-679X
PURE UUID: a544912c-944b-49df-b457-3b0731fc9730
Catalogue record
Date deposited: 21 Oct 2013 11:47
Last modified: 15 Mar 2024 03:35
Export record
Altmetrics
Contributors
Author:
J.H. Choo
Author:
H.A. Spikes
Author:
R. Glovnea
Author:
A. Forrest
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics
