THe influence of colloidal interactions on fiber network strength
2007 (English)In: Journal of Colloid and Interface Science, Vol. 309, no 2, 511-517 p.Article in journal (Refereed) Published
Various forces govern the fiber–fiber interaction in a flowing suspension, causing fibers to create flocs. The aim with this investigation was to examine the influence of colloidal interactions on the fiber network strength by varying surface charge density, electrolyte concentration, and type of counterion. This was accomplished by comparing surface force measurements, utilizing colloidal probe microscopy (CPM), with the apparent yield stress, using a parallel plate rheometer. Results show that by increasing the charge density by grafting carboxymethyl cellulose (CMC) to the surface, a large electrosteric repulsion is created, which gives weaker network strength. Increasing the electrolyte concentration decreases the repulsion. The network strength was, however, not affected by electrolyte concentration for untreated fibers whereas a high electrolyte concentration increased the yield stress for CMC-treated fibers. The change of counterions affect the repulsion, causing a change in network strength due to differences in the surface swelling of cellulose.
Place, publisher, year, edition, pages
2007. Vol. 309, no 2, 511-517 p.
CPM; Rheometer; Colloidal interactions, Charge density, Ionic strength, Counterion, Yield stress
Paper, Pulp and Fiber Technology
IdentifiersURN: urn:nbn:se:kth:diva-6288DOI: 10.1016/j.jcis.2006.08.066ISI: 000245967700040OAI: oai:DiVA.org:kth-6288DiVA: diva2:10963
Tidigare titel: Influence of colloidal interactions on fiber network strength QC 201008312006-10-252006-10-252014-09-22Bibliographically approved