Application of the JKR Method to the Measurement of Adhesion to Langmuir–Blodgett Cellulose Surfaces

✍ Scribed by Mats Rundlöf; Marie Karlsson; Lars Wågberg; Evgeni Poptoshev; Mark Rutland; Per Claesson

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 93 KB
• Volume: 230
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.2000.7108

✦ Synopsis

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.