Permittivity and electric conductivity of aqueous alumina (40 nm) nanofluids at different temperatures |
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| Institution: | 1. Departamento de Física Aplicada, Facultad de Ciencias, Universidad de Vigo, 36310 Vigo, Spain;2. Departamento de Química e Bioquímica, Centro de Química Estrutural, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal;1. Molecular Biomimetics, Department of Chemistry, Ångström Laboratory, Uppsala University (UU), SE-751 20 Uppsala, Sweden;2. Physical Chemistry, Centre of Molecular Devices, Department of Chemistry, Ångström Laboratory, Uppsala University (UU), SE-751 20 Uppsala, Sweden;1. Department of Hematology, Karolinska University Hospital and Karolinska Institutet, SE-17176 Stockholm, Sweden;2. Department of Hematology, Linköping University Hospital, Garnisonsvägen 10, SE-581 85 Linköping, Sweden;3. Department of Medicine, Kristianstad Central Hospital, SE-291 85 Kristianstad, Sweden;4. Section of Hematology and Coagulation, Sahlgrenska University Hospital, 413 45 Göteborg, Sweden;5. Department of Medicine, Kalmar Hospital, SE-391 85 Kalmar, Sweden;6. Department of Medicine, Visby Hospital, S:t Göransgatan 5, SE-621 84 Visby, Sweden;1. Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China;2. School of Mechanical Engineering, Anhui University of Technology, Ma''anshan 243032, China;3. Department of Mechanics, Shanghai University, Shanghai 200444, China;4. Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai University, Shanghai 200072, China |
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| Abstract: | Aiming to study the effect of nanoparticle size on electric properties, the effective relative permittivity and electric conductivity of suspensions of 40 nm particles of aluminium oxide (alumina) in base Milli-Q and Milli-Ro water were determined at six different temperatures in the range (298.15 to 348.15) K, and at eight different concentrations up to 7% mass (2% volume). Present results are compared with previously published values for the same colloids containing 15 nm particles. Empirical equations for describing the experimental data are given. This study demonstrates the importance of the particle size, volume fraction of nanoparticles, temperature and water purity on the effective relative permittivity and electric conductivity of alumina nanoparticles suspensions. Trends for changes in permittivity enhancement and in electric conductivity enhancement with temperature and concentration are examined and discussed. Classical theoretical models in the study of permittivity and conductivity are applied. A summary is given for the effect of size ((15 and 40) nm), concentration (0.25 to 2)% volume and temperature (298.15 to 348.15) K on the behavior of these nanofluids. |
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| Keywords: | Alumina Conductivity Nanofluids Nanoparticles Relative permittivity |
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