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Determination of the dependence of the surface force induced contact radius on particle radius: Cross-linked polystyrene spheres on SiO2/silicon

Published online by Cambridge University Press:  31 January 2011

D.S. Rimai ,
R.S. Moore ,
R.C. Bowen ,
V.K. Smith  and
P.E. Woodgate
D.S. Rimai
Affiliation:
Eastman Kodak Company, Office Imaging, Rochester, New York 14650-2107
R.S. Moore
Affiliation:
Eastman Kodak Company, Materials Science and Engineering, Rochester, New York 14650-2104
R.C. Bowen
Affiliation:
Eastman Kodak Company, Analytical Technology Division, Rochester, New York 14650
V.K. Smith
Affiliation:
Eastman Kodak Company, Analytical Technology Division, Rochester, New York 14650
P.E. Woodgate
Affiliation:
Eastman Kodak Company, Polymer Products, Rochester, New York 14650
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Abstract

The contact radii arising from surface forces were determined for cross-linked polystyrene particles having radii between 1.5 and 10 μm in contact with SiO2/silicon substrates using scanning electron microscopy. It was observed that the contact radius varied approximately as the particle radius to the 0.42 ± 0.13 power. These results are consistent with the theories that assume plastic response of the materials, such as that proposed by Maugis and Pollock [D. Maugis and H. M. Pollock, Acta Metall. 32, 1323 (1984)] but are inconsistent with the predictions of models which assume only elastic response, such as that of Johnson, Kendall, and Roberts [K. L. Johnson, K. Kendall, and A. D. Roberts, Proc. R. Soc. London A 324, 301 (1971)]. The thermodynamic work of adhesion, calculated from the experimental results, was found to be 0.32 J/m2, which is significantly smaller than that reported previously on a similar system.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 3 , March 1993 , pp. 662 - 667
Copyright
Copyright © Materials Research Society 1993

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