期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 432, 期 -, 页码 151-157出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2014.06.061
关键词
Nanocrystalline cellulose; Dicarboxylated cellulose; Dynamic mobility; Zeta potential; Sound attanuation; Electrosonic amplitude
资金
- Industrial Research Chair - FPInnovations
- NSERC
- NSERC's Innovative Green Wood Fibre Products Network
- McGill Engineering Doctoral Award (MEDA)
Nanoparticles are widely used as drug carriers, texturizing agents, fat replacers, and reinforcing inclusions. Because of a growing interest in non-renewable materials, much research has focused on nanocellulose derivatives, which are biodegradable, biocompatible, and easily synthesized. Among nanocellulose derivatives, nanocrystalline cellulose (NCC) has been known for half a century, but its utility is limited because its colloidal stability is challenged by added salt. On the other hand, electrosterically stabilized nanocrystalline cellulose (ENCC) has recently been observed to have superior colloidal stability. Here, we use electrokinetic-sonic-amplitude (ESA) and acoustic attenuation spectroscopy to assess NCC and ENCC C-potentials and sizes over wide ranges of pH and ionic strength. The results attest to a soft, porous layer of dicarboxylic cellulose (DCC) polymers that expands and collapses with ionic strength, electrosterically stabilizing ENCC dispersions at ionic strengths up to at least 200 mmol L-1. (C) 2014 Elsevier Inc. All rights reserved.
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