Friction measured with a surface forces apparatus

John Van Alsten; Steve Granick

doi:10.1080/10402008908981885

Friction measured with a surface forces apparatus

John Van Alsten, Steve Granick

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

A method is described with which friction can be measured between atomically smooth surfaces slid over distances from 1 nm to 1 μm. The force resolution is 0.5 μN, and the pressure can range from zero (adhesive contact only) to 10⁹ N/m². The related method of surface force measurement is also described, with which forces can be measured as a function of distance at separations from hundreds of nanometers down to molecular contact, with a distance resolution of 0.1 to 1 nm. Preliminary findings are reported for the sliding of mica on mica in ambient atmosphere. The friction force varied little with load. The ratio of friction force to normal load therefore decreased with increasing load; it was 2 × 10^-4 at a load of 1N. It is concluded that the friction coefficient is indeterminate for the present asperity-free surfaces. The shear strength was approximately 1 × 10⁶ N/m².

Original language	English (US)
Pages (from-to)	246-250
Number of pages	5
Journal	Tribology Transactions
Volume	32
Issue number	2
DOIs	https://doi.org/10.1080/10402008908981885
State	Published - Apr 1989

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Surfaces and Interfaces
Surfaces, Coatings and Films

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10.1080/10402008908981885

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@article{7e8b17b67c284149bcb3d50cf2f18617,

title = "Friction measured with a surface forces apparatus",

abstract = "A method is described with which friction can be measured between atomically smooth surfaces slid over distances from 1 nm to 1 μm. The force resolution is 0.5 μN, and the pressure can range from zero (adhesive contact only) to 109 N/m2. The related method of surface force measurement is also described, with which forces can be measured as a function of distance at separations from hundreds of nanometers down to molecular contact, with a distance resolution of 0.1 to 1 nm. Preliminary findings are reported for the sliding of mica on mica in ambient atmosphere. The friction force varied little with load. The ratio of friction force to normal load therefore decreased with increasing load; it was 2 × 10-4 at a load of 1N. It is concluded that the friction coefficient is indeterminate for the present asperity-free surfaces. The shear strength was approximately 1 × 106 N/m2.",

author = "{Van Alsten}, John and Steve Granick",

note = "Funding Information: We thank G. McClelland and N. Saka fbr discussions, and G. Carson and H.W . Hu for assistance with measurements. 'I'his work was supported by the Procter and Gamble Exploratory Keseat-ch Program and by the taxpayers of the United States via the National Science Foundation, grant MSM-83-19349.",

year = "1989",

month = apr,

doi = "10.1080/10402008908981885",

language = "English (US)",

volume = "32",

pages = "246--250",

journal = "ASLE transactions",

issn = "1040-2004",

publisher = "Society of Tribologists and Lubrication Engineers",

number = "2",

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TY - JOUR

T1 - Friction measured with a surface forces apparatus

AU - Van Alsten, John

AU - Granick, Steve

N1 - Funding Information: We thank G. McClelland and N. Saka fbr discussions, and G. Carson and H.W . Hu for assistance with measurements. 'I'his work was supported by the Procter and Gamble Exploratory Keseat-ch Program and by the taxpayers of the United States via the National Science Foundation, grant MSM-83-19349.

PY - 1989/4

Y1 - 1989/4

N2 - A method is described with which friction can be measured between atomically smooth surfaces slid over distances from 1 nm to 1 μm. The force resolution is 0.5 μN, and the pressure can range from zero (adhesive contact only) to 109 N/m2. The related method of surface force measurement is also described, with which forces can be measured as a function of distance at separations from hundreds of nanometers down to molecular contact, with a distance resolution of 0.1 to 1 nm. Preliminary findings are reported for the sliding of mica on mica in ambient atmosphere. The friction force varied little with load. The ratio of friction force to normal load therefore decreased with increasing load; it was 2 × 10-4 at a load of 1N. It is concluded that the friction coefficient is indeterminate for the present asperity-free surfaces. The shear strength was approximately 1 × 106 N/m2.

AB - A method is described with which friction can be measured between atomically smooth surfaces slid over distances from 1 nm to 1 μm. The force resolution is 0.5 μN, and the pressure can range from zero (adhesive contact only) to 109 N/m2. The related method of surface force measurement is also described, with which forces can be measured as a function of distance at separations from hundreds of nanometers down to molecular contact, with a distance resolution of 0.1 to 1 nm. Preliminary findings are reported for the sliding of mica on mica in ambient atmosphere. The friction force varied little with load. The ratio of friction force to normal load therefore decreased with increasing load; it was 2 × 10-4 at a load of 1N. It is concluded that the friction coefficient is indeterminate for the present asperity-free surfaces. The shear strength was approximately 1 × 106 N/m2.

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U2 - 10.1080/10402008908981885

DO - 10.1080/10402008908981885

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SP - 246

EP - 250

JO - ASLE transactions

JF - ASLE transactions

SN - 1040-2004

IS - 2

ER -

Friction measured with a surface forces apparatus

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