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Adsorption of bilayers and multilayers of cationic and anionic copolymers of acrylamide on silcon oxide
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences. (FSCN – Fibre Science and Communication Network)
2004 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 274, no 2, 480-488 p.Article in journal (Refereed) Published
Abstract [en]

Silica surfaces were consecutively treated with copolymers of cationic and anionic polyacrylamides (C-PAM and A-PAM, respectively) and the layer-by-layer build-up was continuously monitored with the aid of stagnation point adsorption reflectometry (SPAR). Four different charge densities of the cationic polymer and one charge density of the anionic polymer were studied. The solid substrate used in the investigation was an oxidized Si wafer, the charge of which was varied by performing the measurements at different pH. Adsorption measurements were performed both in deionized water and with a background electrolyte concentration of 0.01 M NaCl The results show that the adsorption of C-PAM at pH 6 was dominated by electrostatic interactions. However, a significant nonionic contribution to the adsorption of C-PAM on SiO2 was detected-when the results of adsorption measurements conducted in deionized water and in 0.01 M NaCl were compared. At pH 9, the adsorption of C-PAM onto SiO2 was found to be geometrically restricted since the adsorption stoichiometry between the polymer charges and the charges on the surface was less than I irrespective of the charge of the C-PAM. Adsorption of the A-PAM onto the C-PAM covered surface increases as a function of the adsorbed charges in the first layer. Experiments showed that it was possible to form multilayers of polyelectrolytes on the SiO2 surface provided the charge of the C-PAM was high enough. The critical charge of the polyelectrolyte for the formation of multilayers was also dependent on the charge of the substrate; that is, the lower the surface charge the higher the critical charge of the C-PAM. The substrate affected the amount of polyelectrolyte adsorbed up to the fifth layer. For further layers there was almost a stoichiometric relationship between the charges of the polyelectrolytes in consecutive layers. Results from studies of the formed multilayers with a quartz crystal microbalance (QCM-D) indicated that there was a close correlation between energy dissipation into the multilayers and a decrease in the adsorption as detected with SPAR. This in turn indicates that a decrease in the reflectometer signal does not necessarily indicate a decrease in adsorption.

Place, publisher, year, edition, pages
2004. Vol. 274, no 2, 480-488 p.
Keyword [en]
multilayer, silicon oxided copolymers
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-2401DOI: 10.1016/j.jcis.2003.11.054ISI: 000221603100015Local ID: 1588OAI: oai:DiVA.org:miun-2401DiVA: diva2:27433
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2011-04-08Bibliographically approved
In thesis
1. Influence of Polymeric Multilayer Treatment on Out-of Plane Properties of CTMP-Based Paperboard
Open this publication in new window or tab >>Influence of Polymeric Multilayer Treatment on Out-of Plane Properties of CTMP-Based Paperboard
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Sundsvall: Mittuniversitetet, 2007
Series
Mid Sweden University doctoral thesis, ISSN 1652-893X ; 40
Keyword
CTMP, Bulk, Multilayer, Polymre adsorption, Scott-Bond, Tensile strength, anionic starch, paperboard, cationic starch, CMC, sack paper, Stagnation Point Adsorption Reflectometry
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-8897 (URN)978-91-85317-78-3 (ISBN)
Public defence
(English)
Available from: 2009-05-06 Created: 2009-05-06 Last updated: 2009-07-16Bibliographically approved

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