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Adsorption of Polyelectrolyte–Nanoparticle Systems on Silica: Influence of Ionic Strength

✍ Scribed by Therese Sennerfors; Daniel Solberg; Fredrik Tiberg

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
160 KB
Volume
254
Category
Article
ISSN
0021-9797

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✦ Synopsis

In this work the effect of ionic strength on the adsorption behavior of cationic polyelectrolyte (acrylamide-acrylamidopropyltrimethylammonium chloride) and negatively charged silica particles has been studied by means of ellipsometry. The adsorption of the polyelectrolyte was observed to increase with increasing salt concentration, a behavior typical for polyelectrolytes with a screening-reduced solvency and a nonelectrostatic affinity for the surface. A similar dependence on the ionic strength was observed when studying the electrolyte effect on the nanoparticle adsorption to the preadsorbed polyelectrolyte film, suggesting that the polyelectrolyte surface conformations largely govern the binding capacity of the particles to the surface.

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