Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 321, Issue 1-3, Pages 258-261Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2008.01.036
Keywords
multilayer film; polyelectrolytes; ellipsometry; wetting
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Polyelectrolyte (PE) multilayer films are surface structures obtained by sequential adsorption of oppositely charged polymers. In the present work we focused on the influence of pH of the solutions of strong and weak polyelectrolytes on the thickness and wetting of multilayers formed on silicon wafers. Four types of PE were used: polyallamine hydrochloride (PAH), poly(diallyldimethylammonium)chloride (PDADMAC), poly(acrylic acid) (PAA), polysodium 4-styrenesulfonate (PSS). Thickness of PE films was measured by ellipsometry and their wetting properties were determined by contact angle measurements. Thicker films were found in conditions when the polyelectrolytes were weakly charged. We observed periodic, layer-to-layer oscillations of contact angle values with the amplitude dependent on type of PE pair and conditions of film formation, however, films with a polycation as the top layer were more hydrophobic. (c) 2008 Elsevier B.V. All rights reserved.
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