Flow behaviour of titanium dioxide dispersions in the presence of 2-hydroxyethyl cellulose

被引：12

作者：

Chandramalar, AVM ^{[1
]}

Kua, SK

Chan, CY

Lim, YY

Leong, YK

机构：

[1] Univ Malaya, Dept Chem, Kuala Lumpur 50603, Malaysia

[2] Monash Univ Sunway Malaysia, Sch Sci & Engn, Bandar Sunway 46150, Petaling Jaya, Malaysia

[3] James Cook Univ N Queensland, Sch Engn, Townsville, Qld 4811, Australia

来源：

COLLOID AND POLYMER SCIENCE | 2000年 / 278卷 / 05期

关键词：

2-hydroxyethyl cellulose; titanium dioxide; molecular weight; steric yield stress; viscosity;

D O I：

10.1007/s003960050544

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：

The effects of 2-hydroxyethyl cellulose (HEC) of weight-average molecular weight 15,000, 90,000 and 7,20,000 on the rheological properties of TiO2 dispersions were evaluated. For all three HECs, the maximum yield stress, tau(ymax), (occurred at zero zeta potential), decreased with increasing HEC concentration. Interestingly, the largest reduction in tau(ymax) was observed with the HEC with the highest molecular weight. This reduction was attributed to steric interaction arising from adsorbed HEC. Adsorbed high-molecular-weight HEC formed an effectively thicker steric barrier because of its larger size and higher adsorption capacity. Bridging interactions that were expected to be important for the high-molecular-weight HEC were found to be unimportant here. In the flocculated regime, HEC enhanced the shear-thinning characteristics of the TiO2 dispersions.

引用

页码：485 / 489

页数：5

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