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Smooth model surfaces from lignin derivatives: II. Adsorption of polyelectrolytes and PECs monitored by QCM-D
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.ORCID iD: 0000-0003-3407-7973
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
Australian National University, Canberra, Australia.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
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2007 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 23, no 7, 3737-3743 p.Article in journal (Refereed) Published
Abstract [en]

For the first time, well-defined and stable lignin model surfaces have been utilised as substrates in polyelectrolyte adsorption studies. The adsorption of polyallylamine (PAH), polyacrylic acid (PAA), and polyelectrolyte complexes (PECs) was monitored using quartz crystal microgravimetry with dissipation (QCM-D). The PECs were prepared by mixing PAH and PAA at different ratios and sequences, creating both cationic and anionic PECs with various charge levels. The adsorption experiments were performed in 1 and 10 mM sodium chloride solutions at pH 5 and 7.5. The highest adsorption of PAH and cationic PECs was found at pH 7.5, where the slightly negative charged nature of the lignin substrate is more pronounced, governing electrostatic attraction of oppositely charged polymeric substances. An increase in the adsorption was further found when the electrolyte concentration was increased. In comparison, both PAA and the anionic PEC showed remarkably high adsorption to the lignin model film. The adsorption of PAA was further studied on silica and was found to be relatively low even at high electrolyte concentrations. This indicated that the high PAA adsorption on the lignin films was not induced by a decreased solubility of the anionic polyelectrolyte. The high levels of adsorption on lignin model surfaces found both for PAA and the anionic PAA-PAH polyelectrolyte complex, points to the presence of strong non-ionic interactions in these systems.

Place, publisher, year, edition, pages
2007. Vol. 23, no 7, 3737-3743 p.
Keyword [en]
lignin model surfaces
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-5162DOI: 10.1021/la063439zISI: 000245012900034Scopus ID: 2-s2.0-34147193023Local ID: 4302OAI: oai:DiVA.org:miun-5162DiVA: diva2:30194
Available from: 2008-11-30 Created: 2008-11-30 Last updated: 2016-10-05Bibliographically approved

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Norgren, MagnusGärdlund, LindaHtun, Myat
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