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Polyelectrolyte multilayers from cationic and anionic starch
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Processum.
2010 (English)In: Starch/Staerke, ISSN 0038-9056, Vol. 62, no 2, 102-114 p.Article in journal (Refereed) Published
Abstract [en]

The purpose of the present work was for identify limits for the formation of stable polyelectrolyte multilayers (PEMs) from cationic and anionic starches (with degrees of substitution of 0.04-0.09) on SiO2 surfaces, taking account of the effect of the charge density of the starches and the salt concentration in the surrounding water phase. The experiments were performed at a pH of 6.3 using stagnation point adsorption reflectometry (SPAR) and quartz crystal microbalance with dissipation (QCM-D). From these experiments it was concluded that it is possible to form PEMs by the adsorption of oppositely charged starches on SiO2 surfaces; it was also found that adsorption of the first layer is controlled both by electrostatic, non-ionic interactions and by pure steric restrictions, i.e. geometrical restrictions, at the surface. The results also indicate that the charge density of the starch must exceed a certain value to allow multilayer formation and that this critical charge density increases with increasing salt concentration. The combination of charge densities of the cationic/anionic starches was also found to influence the adsorption behaviour, and the formed polyelectrolyte multilayers had a high water content of 69-92%. © 2010 WILEY-VCH Verlag GmbH & Co.KGaA, Weinheim.

Place, publisher, year, edition, pages
2010. Vol. 62, no 2, 102-114 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-205DOI: 10.1002/star.200900176OAI: oai:DiVA.org:ri-205DiVA: diva2:936127
Available from: 2016-06-13 Created: 2016-06-13 Last updated: 2016-06-29Bibliographically approved

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