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Science 6 March 1992:
Vol. 255. no. 5049, pp. 1230 - 1232
DOI: 10.1126/science.255.5049.1230
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Articles

Correlation Between Surface Free Energy and Surface Constitution

MANOJ K. CHAUDHURY 1 and GEORGE M. WHITESIDES 2

1 Dow Corning Corporation, Midland, MI 48686
2 Department of Chemistry, Harvard University, Cambridge, MA 02138

Self-assembled monolayers (SAMs) of alkylsiloxanes on elastomeric PDMS (polydimethylsiloxane) were used as model systems to study interactions between surfaces. Surface free energies (ggrsv) of these chemically modified surfaces were estimated by measuring the deformations that resulted from the contact between small semispherical lenses and flat sheets of the elastomer under controlled loads. The measured surface free energies correlated with the surface chemical compositions of the SAMs and were commensurate with the values estimated from the measurements of contact angles. This study provides direct experimental evidence for the validity of estimates of the surface free energies of low-energy solids obtained from contact angles.

Submitted on October 3, 1991
Accepted on January 9, 1992


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