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Structure of complexes formed by oppositely charged polyelectrolytes and adsorbed layers on charged surfaces are sensitive to the low molecular weight salt. Furthermore, if the concentration exceeds some threshold value, the complexes and adsorbed chains can be "dissolved". This is due to the screening of the electrostatic interactions between charged units. In the current paper we perform comparative analysis of "dissolution" (dissociation) of the complexes and layers upon salt addition. For this conventional Brownian dynamics of computer simulations is used. We demonstrate that the complex on the basis of linear chains dissociates at smaller salt concentration than desorption of equivalent chain from oppositely charged surface. The physical reason is due to the difference in the symmetry of the electric field which binds the chains into the complex(layer). In the salt-free regime, intensity of the electric field (and attractive force) between two linear chains decays with the distance R between them like for two spherical objects, ~R-2, if R is bigger than the characteristic size of the chain. On the contrary, the attractive force of the chain to the infinite surface does not depend on the distance to the surface (the electric field is constant). Therefore, if attractive force in the condensed states of the two systems is equal, one need to add more salt to screen the constant force than the decaying one. The computer simulation results on the adsorption of the chains were compared with experimental data obtained for adsorption of cationic poly(4-vinylpyridine) on the surface of anionic liposomes. Good quantitative agreement was achieved.
This article was published in the following journal.
Name: The journal of physical chemistry. B
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Collaborations in biotechnology
Commercial and academic collaborations are used throughout the biotechnology and pharmaceutical sector to enhance research and product development. Collaborations can take the form of research and evaluation agreements, licensing, partnerships etc. ...