Properties of charged non-aqueous colloids in a low conductivity regime |
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| Affiliation: | 1. Department of Life and Earth Sciences (UFR/SVT), University of Ouagadougou, 03 BP 7021 Ouagadougou, Burkina Faso;2. Environmental and Agricultural Research Institute (INERA), BP10 Koudougou, Burkina Faso;3. Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, 901 83 Umea, Sweden;4. Senckenberg Research Institute, Department of Botany and Molecular Evolution, Senckenberganlage 25, 60325 Frankfurt, Germany;1. Energy Technologies Research Institute, University of Nottingham, NG7 2TU, Nottingham, UK;2. Centre for Process Systems Engineering, Imperial College London, SW7 2AZ, London, UK;3. Department of Engineering, University of Cambridge, CB2 1PZ, Cambridge, UK;4. School of Geography, University of Nottingham, University Park, NG7 2RD, Nottingham, UK |
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| Abstract: | Extensive investigation of the properties on non-aqueous charged colloids was undertaken utilizing quasi-elastic light scattering, optical and electrical transients and electrical platecuts. For the first time all basic physical properties of low conductivity colloids were measured. These include size, mobility and charge of colloidal particles, mobilities and concentration of counterions and excess ions, and also size and charge stability. It is shown that highly charged nonaqueous colloids are attainable in a low dielectric media despite of a low degree of dissociation of ionizable species. The importance of space charge conditions is identified and their universal scaling law illustrated for these low conductivity colloids. Ions of one polarity predominate in the double layer, and thus classical treatments of electrophoresis may not apply to these colloids. |
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