Friction Force Spectroscopy of β- and κ-casein monolayers

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Friction Force Spectroscopy of β- and κ-casein monolayers

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Publication Article, peer reviewed scientific
Title Friction Force Spectroscopy of β- and κ-casein monolayers
Author(s) Sotres, Javier ; Svensson, Olof ; Arnebrant, Thomas
Date 2011
English abstract
Friction force spectroscopy (FFS) has been applied to study the tribological properties of β- and κ-casein layers on hydrophobic substrates in aqueous solutions. Nanometer-sized imaging tips were employed. This allowed exerting and determining the high pressures needed to remove the layers, and registering the topographic evolution during this process. Both β- and κ-casein layers showed similar and not particularly high initial frictional responses (friction coefficient of ~1 when measure with a silicon nitride tip). The pressures needed to remove the layers were of the same order of magnitude for both proteins, ~1e8 Pa, but slightly higher for those composed of β-casein. The technique has also shown to be useful in studying the two-dimensional lateral diffusion of the proteins and the wear on the layers they form.
DOI (link to publisher's fulltext)
Publisher American Chemical Society
Host/Issue Langmuir;3
Volume 27
ISSN 0743-7463
Pages 981-992
Language eng (iso)
Subject(s) atomic force microscopy
friction force spectroscopy
Research Subject Categories::NATURAL SCIENCES
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