  
|
     
|
The European Physical Journal B
ISSN: 1434-6028 (printed version)
ISSN: 1434-6036 (electronic version)
Abstract Volume 3 Issue 2 (1998) pp 211-216
Anomalous adhesion in adsorbed polymer layers
T.J. Senden (1), J.-M. di Meglio (2) (a), P. Auroy (3)
(1) Department of Applied Mathematics, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200, Australia
(2) Institut Charles Sadron (CNRS UPR 22) and University Louis Pasteur, 6 rue Boussingault, 67083 Strasbourg Cedex, France
(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
Received: 12 November 1997 / Accepted: 6 March 1998
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.
PACS. 68.45.-v Solid-fluid interfaces - 82.70.-y Disperse systems
(a) email: Jean-Marc.DiMeglio@ics.u-strasbg.fr
Article in PDF-Format (545 KB)
Online publication: July 9, 1998
LINK Helpdesk
© EDP Sciences, Springer-Verlag 1998