An investigation of carbon nanotube jet grinding |
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| Authors: | Carole E. Baddour Cedric L. Briens Serge Bordere Didier Anglerot Patrice Gaillard |
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| Affiliation: | aDepartment of Chemical Engineering, McGill University, 3610 University Street, Montreal, Quebec, Canada H3A 2B2;bDepartment of Chemical and Biochemical Engineering, The University of Western Ontario, 1151 Richmond Street, London, Ontario, Canada N6A 5B9;cArkema, Groupement de Recherches de Lacq, BP 34, 64170 Lacq, France |
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| Abstract: | Since their observation in 1976 and 1991, carbon nanotubes (CNTs) have generated much interest due to their properties and potential applications. CNTs are tubular carbon molecules with remarkable mechanical, electrical, chemical and thermal properties, which make them useful in various applications. Industries producing CNTs via the fluidized bed chemical vapor deposition technique face challenges related to the size of CNT bundles. The two main challenges are agglomeration and agglomerate size distribution control. A solution to these challenges involves the use of jet mills to grind the CNT agglomerates. The goal of this study was to determine whether the nanotubes could be ground with air jets using a commercial jet mill and apply a two-parameter model to describe the grinding process. The present study has indicated that air-jet grinding of CNTs is feasible with a typical commercial jet mill. This paper presents the effect of operational parameters on the arithmetic mean diameter of the ground product. Sonic velocity through the grinding nozzles was required to obtain reasonable grinding rates and relatively narrow particle size distributions. This occurs at high air to solids feedrate ratios. Additionally, a simple attrition model can describe the grinding process in the spiral jet mill. |
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| Keywords: | Carbon nanotubes Jet grinding Particulate processes Attrition Agglomeration |
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