Colloidal behavior of aqueous cellulose nanocrystal suspensions

被引：105
|
作者：
Oguzlu, Hale [1 ,2 ]
Danumah, Christophe [2 ,3 ]
Boluk, Yaman [1 ,2 ]
机构：
[1] Univ Alberta, Dept Civil & Environm Engn, Edmonton, AB T6G 2W2, Canada
[2] Natl Inst Nanotechnol, Edmonton, AB T6G 2M9, Canada
[3] Alberta Innovates Technol Futures, Edmonton, AB T6N 1E4, Canada
来源：
CURRENT OPINION IN COLLOID & INTERFACE SCIENCE | 2017年 / 29卷
关键词：
Sulfonated; Cellulose nanocrystals; Microstructure; Rheology; Gels; Electrolyte; Polymer; Depletion; PHASE-SEPARATION; IONIC-STRENGTH; RHEOLOGY; DISPERSIONS; TRANSITION; DEPOSITION; PARTICLES; STABILITY; POLYMERS; GELATION;
D O I：
10.1016/j.cocis.2017.02.002
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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.
引用
收藏
页码：46 / 56
页数：11
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