Influence of Porosity on the Electrical Sensing Zone and Laser Diffraction Sizing of Silicas. A collaborative study |
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Authors: | Armand Michoel Nicolas De Jaeger Rik Sneyers Walter De Wispelaere Erik Gelade Jo Kern Wim Gorter Peter van Amsterdam Youry Den Tandt Eddy Houtmeyers Luc van Cotthem |
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Institution: | Armand Michoel,Nicolas De Jaeger,Rik Sneyers,Walter De Wispelaere,Erik Geladeé,Jo Kern,Wim Gorter,Peter van Amsterdam,Youry Den Tandt,Eddy Houtmeyers,Luc van Cotthem |
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Abstract: | The objective of a continuing study by the Belgian Particle Technology Group involves difficulties in practical size determinations. This part describes the behaviour of silicas with different porosities during sizing by electrical sensing zone and laser diffraction methods. Anisotropy and porosity were identified to be important particle characteristics in understanding the differences between the two methods. Especially large pore diameters and pore volumes were found to be responsible for shifts in size distribution of 50 to 100%. The use of optical values and optical models was shown to influence these shifts considerably. In the case of spherical silica particles with moderate porosity, no significant differences could be found between the two sizing methods. |
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