Journal
CURRENT OPINION IN COLLOID & INTERFACE SCIENCE
Volume 29, Issue -, Pages 46-56Publisher
ELSEVIER SCIENCE LONDON
DOI: 10.1016/j.cocis.2017.02.002
Keywords
Sulfonated; Cellulose nanocrystals; Microstructure; Rheology; Gels; Electrolyte; Polymer; Depletion
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Funding
- National Institute for Nanotechnology
- Alberta Innovates-BioSolutions
- Natural Science and Engineering Research Council of Canada through ArboraNano Business Led Network of Centre of Excellence
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In this short review, we discuss the colloidal microstructure of sulfonated cellulose nanocrystal (CNC) suspensions and connect to their rheological behavior in the presence of electrolyte, by changing its surface chemistry and also in dilute water soluble polymer solutions. Presence of electrolyte has a significant effect depending both on the concentrations of CNC and electrolyte. The salt presence on the microstructure of CNC suspensions were successfully explained by DLVO theory. Even within the dilute concentration regime (<0.5 vol%), CNC particles can form gels either by adding high concentration of electrolyte or low concentration (around overlapping concentration) of non-adsorbing polymer. Addition of water soluble polymers may cause depletion of CNC if the polymer is not adsorbing. It is believed that the depletion flocculation is the case for the effects of carboxymethyl cellulose (CMC) polymer chains in CNC suspensions and cause significant gelling. (C) 2017 Elsevier Ltd. All rights reserved.
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