Analysis of polymer adsorption onto colloidal particles |
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Authors: | J Bonet Avalos A Johner S Dıez-Orrite |
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Institution: | (1) Departament d'Enginyeria Quımica, ETSEQ, Universitat Rovira i Virgili, Avinguda dels Paısos Catalans, 26, 43007 Tarragona, Spain;(2) (UPR CNRS 022), Institut Charles Sadron, 6, rue Boussingault, 67083 Strasbourg Cedex, France |
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Abstract: | The structure of the layer formed after polymer adsorption onto a spherical particle is numerically studied by means of the
application of the Single-Chain Mean-Field theory. We have determined several overall layer properties including the monomer
volume fraction profiles, the layer thickness, adsorbances related to loops and to tails, as well as the variation of the
crossover distance between loops and tails for different particle radii and fixed polymer length. When the radius of the sphere
is small enough to affect the loop layer, one enters a single-adsorbed-chain regime, characterized by a critical sphere radius.
In this regime, structural changes in the adsorbed layer arise. For such small sphere, the loop layer is confined to a region
whose thickness is of the order of the radius of the adsorbing sphere, and two long tails dominate the outer layer and the
adsorbance due to tails dominates that due to loops. An analysis of the structure of the outer tail layer for this small sphere
case is also presented. |
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Keywords: | 61 25 Hq Macromolecular and polymer solutions polymer melts swelling 82 35 Gh Polymers on surfaces adhesion 82 35 Lr Physical properties of polymers |
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