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Polyelectrolyte Adsorption on Thin Cellulose Films Studied with Reflectometry and Quartz Crystal Microgravimetry with Dissipation
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0001-8622-0386
2009 (English)In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 10, no 1, 134-141 p.Article in journal (Refereed) Published
Abstract [en]

Thin cellulose films were prepared by dissolving carboxymethylated cellulose fibers in N-methyl morpholine oxide and forming thin films on silicon wafers by spin-coating. The adsorption of cationic polyacrylamides and polydiallyldimethylammonium chloride onto these films was studied by stagnation point adsorption reflectometry (SPAR) and by quartz crystal microgravimetry with dissipation (QCM-D). The polyelectrolyte adsorption was studied by SPAR as a function of salt concentration, and it was found that the adsorption maximum was located at 1 mM NaCl for polyelectrolytes of low charge density and at 10 mM NaCl for polyelectrolytes of high charge density. Electrostatic screening led to complete elimination of the polyelectrolyte adsorption at salt concentrations of 300 mM NaCl. According to the QCM-D analysis, the cellulose films showed a pronounced swelling in water that took several hours to complete. Subsequent adsorption of polyelectrolytes onto the cellulose films led to a release of water from the cellulose, an effect that was substantial for polyelectrolytes of high charge density at low salt concentrations. The total mass change including water could therefore show either an increase or a decrease during adsorption onto the cellulose films, depending on the experimental conditions.

Place, publisher, year, edition, pages
2009. Vol. 10, no 1, 134-141 p.
Keyword [en]
Adsorption; Cellulose; Cellulose derivatives; Chlorine compounds; Dewatering; Dissolution; Electrolytes; Oxide films; Oxide minerals; Plastic films; Polyelectrolytes; Polymers; Quartz; Quartz crystal microbalances; Reflection; Reflectometers; Semiconducting silicon compounds; Silicon wafers; Sodium chloride; Spinning (fibers); Water analysis
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-14143DOI: 10.1021/bm8010193ISI: 000262399600018Scopus ID: 2-s2.0-58549093765OAI: oai:DiVA.org:kth-14143DiVA: diva2:330759
Note
QC 20100720Available from: 2010-07-20 Created: 2010-07-20 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Dynamic and Equilibrium Properties of Adsorbed Polyelectrolyte Layers
Open this publication in new window or tab >>Dynamic and Equilibrium Properties of Adsorbed Polyelectrolyte Layers
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 2008. 66 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2008:25
Keyword
adsorption; cellulose; conformation; flocculation; kinetics; model surfaces; polyelectrolytes; pulp fibres; Quartz Crystal Microbalance with Dissipation; silicon oxide; Stagnation Point Adsorption Reflectometry
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-4697 (URN)978-91-7178-938-9 (ISBN)
Public defence
2008-04-25, STFI-salen, STFI-Packforsk, Drottning Kristinas väg 61, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20100720Available from: 2008-04-18 Created: 2008-04-18 Last updated: 2010-07-20Bibliographically approved

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Wågberg, Lars

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