Equilibrium properties of reversibly flocculated dispersions |
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| Institution: | 1. Qingdao Industrial Energy Storage Research Institute, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, PR China;2. Key Laboratory for Renewable Energy, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, PR China;1. School of Agriculture and Food Sciences, The University of Queensland, Brisbane, Queensland, 4072, Australia;2. Progel Pty. Ltd, Level 7, GP South, Staff House Road, The University of Queensland, Brisbane, Queensland, 4071, Australia;1. School of Materials Science and Engineering, Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province, Central South University, Changsha 410083, China;2. College of Biological and Chemical Engineering, Guangxi University of Science and Technology, Liuzhou 545006, China;3. School of Physics and Electronics, Hunan University, Changsha 410083, China;1. School of Metallurgy and Environment, Central South University, Changsha City, Hunan 410083, China;2. Department of Metallurgical Engineering, University of Utah, Salt Lake City, UT 84112, USA;1. Sapienza University of Rome, Chemistry Department, Piazzale Aldo Moro, 5, 00185 Rome, Italy;2. Department of Physics & Astronomy, Hunter College of the City University of New York, New York, NY 10065, United States;3. Graduate center, City University of New York, New York, NY 10016, United States;4. Department of Chemistry and Biochemistry, Hunter College of the City University of New York, New York, NY 10065, United States;5. Electtrochimica ed Energia, Rome, Italy;6. Department of Chemical and Pharmaceutical Sciences, University of Ferrara, Via Fossato di Mortara, 17, 44121, Ferrara, Italy |
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| Abstract: | The structure of sonic flocculated dispersions can be changed reversibly by means of shearing. Often the changes are not instantaneous. The resulting shear-history effect gives rise to a complex but interesting rheological behaviour. Using non-aqueous suspensions of fumed silica, the rheological equilibrium properties of such systems are investigated. To change the floc structure, the water content of the particles is altered. As well as the steady-state shear viscosity, the equilibrium modulus and the yield stress are measured. Various techniques are compared. The effect of concentration on the equilibrium properties is used to test some structural models. The concentration dependence is best described by a power-law relation, the power being identical for modulus and yield stress. These results compare well with some theoretical predictions. Contrary to the assumptions used in the modelling, the yield stress is often dominated by kinetic phenomena. This shortcoming also shows up in the predictions for the critical strain. |
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