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Rheological Behavior of Titanium Dioxide Suspensions.
Hua-Gui Yang1, Chun-Zhong Li, Hong-Chen Gu
1Institute of Technical Chemistry and Physics, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, People's Republic of China
Journal of Colloid and Interface Science
|March 20, 2001
Summary
This study details the rheological properties of titanium dioxide suspensions, revealing how particle size, temperature, and pH influence viscosity and yield stress. These findings are crucial for optimizing material processing and applications.
Area of Science:
- Materials Science
- Colloid Science
- Rheology
Background:
- Understanding the flow behavior of dispersions is critical for industrial applications.
- Titanium dioxide (TiO2) is a widely used material whose rheological properties require detailed investigation.
Purpose of the Study:
- To comprehensively investigate the rheological properties of titanium dioxide (TiO2) suspensions.
- To determine the influence of particle size distribution, temperature, and pH on TiO2 suspension rheology.
- To validate rheological models for TiO2 dispersions.
Main Methods:
- Measurements of intrinsic viscosity using an Ubbelohde capillary viscometer.
- Steady shear viscosity and yield stress determination using a Brabender rheometer across various solid volume fractions.
- Rheological behavior analysis under varying temperatures and pH using a Rheometrics RFS-II rheometer.
Main Results:
- Rheological properties significantly differ based on particle size distribution.
- Shear viscosity and yield stress generally decrease with increasing temperature, with complex behavior observed around 50°C.
- Maximum shear viscosity and yield stress correlate with the isoelectric point, indicating pH-dependent surface charge effects.
Conclusions:
- Rheological models (Quemada, Casson, Zhou) effectively describe TiO2 suspension behavior.
- Temperature and pH are critical factors influencing TiO2 dispersion rheology.
- The study provides valuable parameters for predicting and controlling the flow properties of titanium dioxide suspensions.