Temperature induced gelation of concentrated ceramic suspensions: rheological properties |
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| Affiliation: | 1. Institute of Laser and Opto-electronics, College of Precision Instrument and Opto-electronics Engineering, Tianjin University,Tianjin 300072, China;2. Key Laboratory of Opto-electronics Information Technology (Ministry of Education), Tianjin University, Tianjin 300072, China;3. College of Physics Science, Nankai University, Tianjin 300071, China;4. School of Electronics Information Engineering, Tianjin University of Technology, Tianjin 300384, China;1. Department of Radiochemistry and Colloids Chemistry, Faculty of Chemistry, Maria Curie-Sklodowska University, M. Curie-Sklodowska Sq. 3, 20-031 Lublin, Poland;2. Chuiko Institute of Surface Chemistry, General Naumov Street 17, 03164 Kiev, Ukraine;3. Department of Physical Chemistry – Interfacial Phenomena, Faculty of Chemistry, Maria Curie-Sklodowska University, M. Curie-Sklodowska Sq. 3, 20-031 Lublin, Poland |
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| Abstract: | Concentrated, sterically stabilised ceramic suspensions have been reversibly gelled by changing the temperature. Using an amphiphilic polymer, Hypermer KD3, as dispersant for alumina and alumina-silicon carbide whisker composite mixtures in pentanol resulted in a transition from dispersed to flocculated state close to room temperature. The collapse of the adsorbed polymer layer with decreasing solvency (temperature) in the marginal solvent pentanol induces flocculation when the long-range van der Waals force overcomes the remaining steric repulsion. Temperature induced gelation (TIG) of concentrated suspensions has a drastic effect on the rheological properties. At temperatures above 30°C, the suspensions have a low viscosity and negligible elasticity. When the temperature is lowered below 20°C, the viscosity increases significantly and the viscoelastic behaviour becomes predominantly elastic. The elasticity and the associated particle network strength are sufficiently high for a highly concentrated gelled suspension to support its own weight. The potential use of TIG as a novel forming method was discussed with relation to other new shaping techniques. © |
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