Low shear rheological behaviour of two-phase mesophase pitch |
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| Affiliation: | 1. Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;2. Department of Physics, Hebei Normal University for Nationalities, Chengde 067000, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;4. Avic Composite Corporation Ltd., Beijing 101300, China;5. National Institute of Clean and Low Carbon Energy, Beijing 102209, China;6. Tianjin Polytechnic University, Tianjin 300387, China;1. Fuel Cell Laboratory, Korea Institute of Energy Research (KIER), Daejeon, 34129, Republic of Korea;2. Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul 03722, Republic of Korea;3. Advanced Energy and System Engineering, University of Science and Technology (UST), Daejeon 34113, Republic of Korea;4. Institute for Materials Chemistry and Engineering, Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka 816-8580, Japan;1. Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan;2. Institute for Materials Chemistry and Engineering, Kyushu University, Kasuga, Fukuoka 816-8580, Japan;3. Research for Education Center of Carbon Resources, Kyushu University, Kasuga, Fukuoka 816-8580, Japan;4. Department of Organic and Nano Engineering, Hanyang University, 222 Wangsimniro, Seongdong-gu, Seoul 133-791, Republic of Korea;1. School of Printing and Packaging Engineering, Xi’an University of Technology, Xi’an 710048, PR China;2. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, PR China;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. The Research Center for Advanced Carbon Materials, Hunan University, Changsha 410082, China;3. Hubei Province Key Laboratory of Coal Conversion & New Carbon Materials, Wuhan University of Science and Technology, Wuhan 430081, China;4. School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom;1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao, Shandong 266580, People’s Republic of China;2. China National Offshore Oil Corporation, Beijing 100010, People’s Republic of China;3. Institute of Applied Ecology, Chinese Academy of Sciences, People’s Republic of China;4. Sinopec Energy Conservation and Environmental Protection Engineering Technology Co. Ltd, People’s Republic of China |
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| Abstract: | The low shear rate rheology of two phase mesophase pitches derived from coal tar pitch has been investigated. Particulate quinoline insolubles (QI) stabilised the mesophase spheres against coalescence. Viscosity measurements over the range 10–106 Pa s were made at appropriate temperature ranges. Increasing shear thinning behaviour was evident with increasing mesophase content. At low mesophase contents the dominant effect on the near Newtonian viscosity was temperature but at higher contents it was the shear rate; temperature dependence declined to near zero. The data indicated that agglomeration could be occurring at intermediate mesophase volume fractions, 0.2–0.3. The Krieger–Dougherty function and its emulsion analogue indicated that in this region the mesophase pitch emulsions actually behaved like ‘hard’ sphere systems and the effective volume fraction was estimated as a function of shear rate illustrating the change in extent of agglomeration. At the higher volume fractions approaching the maximum packing fraction, which could only be measured at higher temperatures, the shear thinning behaviour changed in character and it is considered that this is possibly due to shear induced deformation and breakup of dispersed drops in the shear field. |
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