Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 338356
Title Specific ion effects on weak polyelectrolyte multilayer formation
Author(s) Kovacevic, D.; Burgh, S. van der; Keizer, A. de; Cohen Stuart, M.A.
Source The Journal of Physical Chemistry Part B: Condensed Matter, Materials, Surfaces, Interfaces & Biophysical 107 (2003)32. - ISSN 1520-6106 - p. 7998 - 8002.
Department(s) Physical Chemistry and Colloid Science
Publication type Refereed Article in a scientific journal
Publication year 2003
Keyword(s) atomic-force microscopy - highly aggregating systems - polymer adsorption - exponential-growth - complex-formation - films - salt - hydrogels - interface - kinetics
Abstract The layer-by-layer deposition method to prepare multilayers of polyelectrolytes of alternating charge has been followed in situ by means of optical reflectometry. It has been shown previously that in solutions containing both weak polyelectrolytes and appropriate salt the buildup of multilayers is modified and becomes an adsorption/dissolution process. The influence of different salts (phosphates, chlorides, and nitrates) and polyelectrolyte molecular weight on formation and erosion of multilayers on silica surfaces was investigated. In all experiments, the anionic polyelectrolyte was poly(acrylic acid). As the cationic polyelectrolyte, poly(dimethylaminoethyl methacrylate), poly(allylamine hydrochloride), and poly(2-vinyl-N-methylpyridinium iodide) were used. It has been shown that at very low ionic strength (1 mM) regular buildup of multilayers is observed independent of the salt used. However, at higher ionic strength, dissolution also takes place, and the critical "glass-transition ionic strength" needed for the multilayer to be dissolved depends on the salt used, as well as on the polycation/polyanion pair studied
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