Thin adsorbed films of a strong cationic polyelectrolyte on silica substrates

Popa, Ionel Valentin; Cahill, Brian; Maroni, Plinio; Papastavrou, Georg Alexander; Borkovec, Michal

doi:10.1016/j.jcis.2007.01.050

Scientific article

English

Thin adsorbed films of a strong cationic polyelectrolyte on silica substrates

Contributors

Popa, Ionel Valentin; Cahill, Brian; Maroni, Plinio; Papastavrou, Georg Alexander; Borkovec, Michal

Published in

Journal of colloid and interface science, vol. 309, no. 1, p. 28-35

Publication date

2007

Abstract

The adsorption of poly(diallyldimethyl ammonium chloride) (DADMAC) on planar silica substrates was examined as a function of ionic strength and pH. The study was carried out with reflectometry in an impinging-jet cell and complemented by atomic force microscopy (AFM) and ellipsometry investigations. The adsorption process is initially transport limited, whereby the adsorption rate increases somewhat with increasing ionic strength. This effect is caused by a simultaneous decrease of the hydrodynamic radius of the polymer. After a transient period, the adsorption process saturates and leads to an adsorption plateau. The plateau value increases strongly with increasing ionic strength. This increase can be explained by progressive screening of the electrostatic repulsion between the adsorbing polyelectrolyte chains, as can be rationalized by a random sequential adsorption (RSA) model. The adsorbed amount further increases with increasing pH, and this effect is probably caused by the corresponding increase of the surface charge of the silica substrate.

UNIGE affiliation entities

Faculté des sciences / Section de chimie et biochimie / Département de chimie minérale, analytique et appliquée

Citation (ISO format)

POPA, Ionel Valentin et al. Thin adsorbed films of a strong cationic polyelectrolyte on silica substrates. In: Journal of colloid and interface science, 2007, vol. 309, n° 1, p. 28–35. doi: 10.1016/j.jcis.2007.01.050

Article (Published version)

Identifiers

PID : unige:13129
DOI : 10.1016/j.jcis.2007.01.050

Additional URL for this publication

http://linkinghub.elsevier.com/retrieve/pii/S0021979707000999

Journal ISSN

0021-9797

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06/01/2011 14:45:00

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06/01/2011 14:45:00

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14/03/2023 16:11:22

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29/10/2024 17:40:53

Thin adsorbed films of a strong cationic polyelectrolyte on silica substrates

Contributors

Published in

Publication date

Abstract

UNIGE affiliation entities

Citation (ISO format)

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Additional URL for this publication

Journal ISSN

Technical informations

Creation

First validation

Update

Status update

Last indexation