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Anomalous adhesion in adsorbed polymer layers |
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| Authors: | TJ Senden J-M di Meglio P Auroy |
| Institution: | (1) Department of Applied Mathematics, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200, Australia, AU;(2) Institut Charles Sadron (CNRS UPR 22) and University Louis Pasteur, 6 rue Boussingault, 67083 Strasbourg Cedex, France, FR;(3) Laboratoire de Chimie et de Physicochimie des Assemblages Supramoléculaires Organisés (CNRS URA 448), Institut Curie, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05, France, FR |
| Abstract: | Anomalous adhesion behaviour observed in the polydimethylsiloxane/heptane/silica system is reported. This behaviour is characterised by the infrequent appearance of one or more elastic minima which occur in addition to the ever-present primary adhesion. The resulting elastic force is attributed to loops connecting the tip to the substrate and can be described by two models; a worm-like chain, and a freely jointed chain. Both models give similar values for the characteristic segment length of around 0.24 nm and indicate that the chains have been extended by between 90 to 95% of their chain contour length before desorption. In some cases multiple adhesions were observed between tip and substrate and have been used to suggest a method for determining the distribution of adsorbed polymer loops. Received: 12 November 1997 / Accepted: 6 March 1998 |
| Keywords: | PACS 68 45 -v Solid-fluid interfaces - 82 70 -y Disperse systems |
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