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Science 15 September 1989:
Vol. 245. no. 4923, pp. 1223 - 1225
DOI: 10.1126/science.245.4923.1223
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Articles

Shear Forces in Molecularly Thin Films

MARTIN SCHOEN 1, CHARLES L. RHYKERD JR. 2, DENNIS J. DIESTLER 3, and JOHN H. CUSHMAN 2

1 Universität, Witten/Herdecke, Naturwissen-schaftliche Fakultät, Institut für Experimentalphysik, Stockumer Strasse 10, 5810
2 Department of Agronomy, Purdue University, West Lafayette, IN 47907.
3 Department of Chemistry, Purdue University, West Lafayette, IN 47907.

Monte Carlo and molecular dynamics methods have been used to study the shearing behavior of an atomic fluid between two plane-parallel solid surfaces having the face-centered cubic (100) structure. A distorted, face-centered cubic solid can form epitaxially between surfaces that are separated by distances of one to five atomic diameters. Under these conditions a critical stress must be overcome to initiate sliding of the surfaces over one another at fixed separation, temperature, and chemical potential. As sliding begins, a layer of solid exits the space between the surfaces and the remaining layers become fluid.

Submitted on April 17, 1989
Accepted on July 25, 1989


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