The significance of stagnant layer conduction in electrokinetics |
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| Affiliation: | 1. Department of Chemistry, Inha University, 253 Nam-gu, Incheon 402-751, South Korea;2. Industrial Liaison Research Institute, Department of Mechanical Engineering, College of Engineering, Kyung Hee University, 446-701 Yongin, South Korea;3. Department of Polymer Materials, Jilin Institute of Chemical Technology, Jilin City 132022, People''s Republic of China;1. Department of Materials Science & Engineering, McMaster University, 1280 Main Street West, Hamilton, Ontario, L8S 4L7, Canada;2. University of Science and Technology Beijing, 30 Xue Yuan Road, Haidian District, Beijing, 100083, China;1. Department of Polymer Materials, Jilin Institute of Chemical Technology, Jilin City 132022, People''s Republic of China;2. Department of Oil and Gas Storage and Transportation Engineering, Jilin Institute of Chemical Technology, Jilin City 132022, People''s Republic of China;3. Department of Chemistry, Inha University, Nam-gu, Incheon 402-751, South Korea;1. Department of Mechanical Engineering, Kumaraguru College of Technology, Coimbatore, 641049, Tamil Nadu, India;2. Department of Science and Humanities, Chemistry division, Kumaraguru College of Technology, Coimbatore, 641049, Tamil Nadu, India;3. Department of Mechanical Engineering, Vellore Institute of Technology, Vellore, Tamil Nadu, India |
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| Abstract: | This paper examines the consequences of the occurrence of conduction processes in the stagnant fluid layer between the surface of a colloidal particle and the shear plane when it is undergoing an electrokinetic process. It is shown that the most widely used model system for studying electrokinetics (viz. monodisperse polystyrene sulfate latex) displays significantly different behaviour in different experiments depending on the details of the post-polymerisation clean-up procedure. Nonetheless, the results provide important insights into how electrokinetic results should be interpreted. A procedure is suggested which should allow a more realistic evaluation of the diffuse double layer potential from electrokinetic results without the need for extensive conduction studies. |
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