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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/231508
- Adsorption of a strong polyelectrolyte to model lignin surfaces
- Notley, Shannon M.; Norgren, Magnus
- The adsorption of a strong, highly charged cationic polyelectrolyte to a kraft lignin thin film was investigated as a function of the adsorbing solution conditions using the quartz crystal microbalance. The polyelectrolyte, PDADMAC, with a molecular weight of 100 kDa and one cationic charge group per monomer, was adsorbed to the anionically charged lignin film in the pH range 3.5-9.5 in electrolyte solution of 0.1 to 100 mM NaCl. At low pH, the adsorbed amount of PDADMAC was minimal, however, this increased as a function of increasing pH. Indeed, the surface excess increased significantly at about pH 8.5, where ionization of the phenolic groups on the lignin macromolecule may be expected. Furthermore, at this elevated pH, the adsorbed amount of PDADMAC decreased as the ionic strength of the solution increased above 1 mM. This is due to the competitive adsorption of counterions to the lignin surface and indicates that the adsorption of PDADMAC to lignin is of a pure electrosorption nature.
- Publication type
- Journal article
- Biomacromolecules, Vol. 9, no. 7 (Jul 2008), pp. 2081-2086
- Publication year
- FOR Code(s)
- 03 Chemical Sciences; 06 Biological Sciences; 09 Engineering
- Adsorption; Cationic polyelectrolytes; Cations; Chemical modification; Competitive adsorption; Controlled study; Counter-ions; Crystal structure; Electrolyte solutions; Electrosorption; Electrostatics; Film; Hydrogen-ion concentration; Ionic strength; Ionization; Kraft lignin; Lignans; Lignins; Molecular weight; Monolayers; Monomers; Osmolar concentration; Oxide minerals; pH range; Phenolic groups; Phenols; Polyelectrolytes; Polyethylenes; Polymers; Quartz crystal microbalances; Quaternary ammonium compounds; Silicon dioxide; Sodium chloride; Solution conditions; Surface charge; Surface excess; Surface property; Thick films
- American Chemical Society
- Publisher URL
- Copyright © 2008 American Chemical Society.
- Additional information
- Supported by the Cooperative Research Centre for Functional Communication Surfaces (CRC SmartPrint).
- Peer reviewed