Flow behaviour of titanium dioxide dispersions in the presence of 2-hydroxyethyl cellulose |
| |
| Authors: | A. V. M. Chandramalar S. K. Kua C. Y. Chan Y. Y. Lim Y. K. Leong |
| |
| Affiliation: | (1) Department of Chemistry University of Malaya 50603 Kuala Lumpur, Malaysia, MY;(2) School of Engineering & Science Monash University (Sunway Malaysia) Bandar Sunway, 46150 Petaling Jaya Malaysia, MY;(3) School of Engineering James Cook University Townsville 4811, Australia, AU |
| |
| Abstract: | 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, τymax, (occurred at zero zeta potential), decreased with increasing HEC concentration. Interestingly, the largest reduction in τymax 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. Received: 8 November 1999 Accepted: 20 December 1999 |
| |
| Keywords: | 2-hydroxyethyl cellulose Titanium dioxide Molecular weight Steric yield stress Viscosity |
| 本文献已被 SpringerLink 等数据库收录！ |
|
