Home List of Titles Effect of introduced charge in cellulose gels on surface interactions and the adsorption of highly charged cationic polyelectrolytes
Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/231502
- Effect of introduced charge in cellulose gels on surface interactions and the adsorption of highly charged cationic polyelectrolytes
- Notley, Shannon
- The interaction between cellulose surfaces in aqueous solution has been measured using colloidal probe microscopy. Cellulose thin films with varying charge through carboxyl group substitution were used in this study with the surface forces fit to DLVO theory. It was found that the surface potential increased, as expected, with increasing carboxyl substitution. Furthermore, for a given degree of substitution, the surface potential increased as a function of increasing pH. At low pH, the surface forces interaction were attractive and could be fit to the non-retarded Hamaker equation using a constant of 3 x 10-21 J. At pH greater than 5, the force interactions were monotonically repulsive, regardless of the ionic strength of the solution for all charge densities of the cellulose thin films. The adsorption of polyDADMAC to these charged cellulose films was also investigated using the quartz crystal microbalance. It was found that for the low charge film, a low surface excess of PDADMAC was sensed and that the adsorbed conformation was essentially flat. However for the higher charged cellulose film, a spontaneous de-swelling was observed resulting in no possibility of quantitatively determining the sensed mass using QCM.
- Publication type
- Journal article
- Physical Chemistry Chemical Physics, Vol. 10, no. 13 (Feb 2008), pp. 1819-1825
- Publication year
- FOR Code(s)
- 02 Physical Sciences; 03 Chemical Sciences
- Acetic acid derivative; Adsorption; Cations; Cellulose; Chloroacetic acid; Electrolytes; Gels; Hydrogen-ion concentration; Methodology; pH; Physical chemistry; Surface properties; Time factors
- Royal Society of Chemistry
- Publisher URL
- Copyright © 2008 The Owner Societies.
- Peer reviewed