The viscous behaviour and structure of aqueous suspensions of goethite

被引:26
作者
Blakey, BC
James, DF [1 ]
机构
[1] Univ Toronto, Dept Mech & Ind Engn, Toronto, ON M5S 3G8, Canada
[2] Univ Toronto, Dept Chem Engn & Appl Chem, Toronto, ON M5S 3E5, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
aqueous suspensions; goethite; rheology; structure; viscosity;
D O I
10.1016/j.colsurfa.2003.08.019
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
Aqueous suspensions of goethite, prepared at neutral pH, were found to be flocculated, highly viscous and extremely shear thinning at particle volume fractions from 0.01 to 0.08. Then a suspension having a volume fraction of 0.02 was observed by optical microscopy over a range in pH values, and fluid structure correlated with viscous behaviour, that is, a pH that produced a more dispersed structure yielded a lower viscosity and a lower degree of shear thinning. Flocculation and high viscosity were found to persist at high zeta potentials (xi). The persistence could not be predicted using classical DLVO theory, which indicated the presence of an attractive force in addition to van der Waals forces. It was hypothesized that the different crystal faces of goethite possess different charges and thus provide an additional attractive force, one that is electrostatic. The theory was supported by electron microscopy studies of mixtures of goethite and charged latex spheres. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码:19 / 30
页数:12
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