The University of Southampton
University of Southampton Institutional Repository

Friction reduction in low-load hydrodynamic lubrication with a hydrophobic surface

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
0301-679X
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
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), 154-159. (doi:10.1016/j.triboint.2005.09.006).

Record type: Article

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: https://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: 16 Jul 2019 21:24

Export record

Altmetrics

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

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×