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Advances in Physical Chemistry
Volume 2010 (2010), Article ID 502709, 11 pages
http://dx.doi.org/10.1155/2010/502709
Research Article

Adhesion on Nanoorganized Multilayers: Surface Thermodynamics and Local Energy Dissipation

1Faculty of Sciences, Lebanese University, Hadath, BP 13-5789, Beirut, Lebanon
2Institute of Condensed Matter and Nanosciences - Bio & Soft Matter (IMCN-BSMA), Universitè Catholique de Louvain, Croix du Sud 1 box 4, 1348 Louvain-la-Neuve, Belgium
3Institut de Chimie des Surfaces et Interfaces, CNRS, 15 Rue Jean Starcky, BP 2488, 68057 Mulhouse, France

Received 4 December 2009; Revised 12 April 2010; Accepted 14 June 2010

Academic Editor: Samir K. Pal

Copyright © 2010 Yolla Kazzi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Nanostructured multilayers, composed of alternate organic (3-mercaptopropyltrimethoxysilane, alkylthiols, polydimethylsiloxane) and metallic (gold) layers, are grafted onto glass and prepared in order to modify the mechanical and dissipative properties of a thin surface layer of the substrate. The external face is constituted either of gold or alkyl groups, allowing us to study two types of surfaces exhibiting different chemical and thermodynamic properties. The formation and the structure of the nanostructured multilayers are first examined by means of various techniques such as atomic force microscopy (AFM), wettability, X-ray photoelectron spectroscopy (XPS), and conductivity measurements. All the results concerning the structure of the systems studied are used to understand the adhesive properties at short contact times (tack) of the multi-layers and an elastomer (polyisoprene). The influence of the structural aspects of gold layers, the length of the alkyl chains of the top layer, the terminal functionality, and the length of the confined organic layer between two gold layers on the energy of adhesion regarding the polyisoprene are clearly demonstrated. The influence of the nano-structured surface layers on adhesion phenomena is explained in terms of either the surface thermodynamics or local energy dissipation during the propagation of a fracture according to complex mechanisms.