Deposition of Colloid Particles at Heterogeneous Surfaces

Zbigniew Adamczyk, jakub Barbasz, and Mafgorzata Nattich 

From a practical point of vie v, however, especially interesting seems the problem of particle deposition at heterogeneous surfaces, covered by sites such as polyelectrolyte chains [27-30], proteins [31, 32] or colloid nanoparticles [33-36]. 

Besides practical importance, the deposition of particles on heterogeneous surfaces, in particular surface features, has a major significance for colloid science, because interesting dues concerning the dynamic particle center interactions can be extracted by determining the maximum coverage and the topology of partide layers [43, 44]. 

Despite this considerable significance for basic science and practice, the problem of partide deposition at heterogeneous surfaces, especially on surface features of various shapes, has not been reviewed recently in the literature. Therefore, the main 

Highlights in Colloid Science. Edited by Dimo Pbtikanov and Dotchi Exerowa Copyright 2009 WILEY-VCH Verlag GmbH Co. KGaA, Weinheim ISBN 978-3-527-32037-0 

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From an experimental point of view, of more interest is the deposition model exploiting spherically shaped sites. The basic assumption of this model is that the colloid particle can only be adsorbed upon touching the site (Figure 11.2b). Otherwise, at bare interface, the particle will not adsorb. Physically, this corresponds to the situation where the particles are irreversibly bound to the sites due to short-range attractive interactions of an electrostatic or chemical nature. Interestingly, particle deposition at heterogeneous surfaces covered by spherically shaped sites is a three-dimensional process, contrary to deposition at disk-shaped sites. 

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