title: Application of the JKR Method to the Measurement of Adhesion to Langmuir-Blodgett Cellulose Surfaces.
abstract: The JKR method has been applied for studying adhesion between poly(dimethylsiloxane) (PDMS) caps and Langmuir-Blodgett cellulose surfaces including the substrate, hydrophobized mica, and two flat mineral surfaces, bare mica and glass. The self-adhesion of PDMS caps and oxidized PDMS caps are included as a reference to compare with literature data. The results of the measurements have been compared with previous studies using the surface force apparatus and similar systems. A satisfactory agreement is obtained for simple systems showing no, or very limited, hysteresis between loading and unloading curves. In several cases, however, a large hysteresis is found between loading and unloading curves, with a larger adhesion measured from the pull-off force than from the JKR-curve determined on loading. This is, for instance, the case for PDMS against cellulose. The situation is analogous to that found in wetting studies showing a large hysteresis between advancing and receding contact angles. Copyright 2000 Academic Press.
authors.affiliation: SCA Graphic Research AB, Sundsvall, SE-851 21, Sweden
authors.initials: M
authors.lastname: Rundlöf
authors.initials: M
authors.lastname: Karlsson
authors.initials: L
authors.lastname: Wågberg
authors.initials: E
authors.lastname: Poptoshev
authors.initials: M
authors.lastname: Rutland
authors.initials: P
authors.lastname: Claesson