Selective particle size analysis in binary submicron particle mixtures using density dependent differential sedimentation

  • Particle size characterization of heterogeneous mixtures is a challenging task, as it is not feasible to assign the measured signals to the individual components. Within this framework, the study proposes a method that applies the working principle of differential centrifugal sedimentation (DCS) in order to simultaneously separate and measure the denser component within a binary material mixture of submicron particles. The method was validated using a model system consisting of polyvinyl chloride (PVC) and diamond particles in a size range of 0.5 – 1.5 µm. The results proved that by applying a proper density gradient fluid, the diamond particles can be selectively analyzed by hindering the sedimentation of the lighter PVC component. Furthermore, a very promising application could be found with respect to wet fine grinding processes in stirred media mills. In fact, the approach was utilized to individually determine the particle size distribution of the grinding media wear within an ultrafine organic product. Despite the low quantityParticle size characterization of heterogeneous mixtures is a challenging task, as it is not feasible to assign the measured signals to the individual components. Within this framework, the study proposes a method that applies the working principle of differential centrifugal sedimentation (DCS) in order to simultaneously separate and measure the denser component within a binary material mixture of submicron particles. The method was validated using a model system consisting of polyvinyl chloride (PVC) and diamond particles in a size range of 0.5 – 1.5 µm. The results proved that by applying a proper density gradient fluid, the diamond particles can be selectively analyzed by hindering the sedimentation of the lighter PVC component. Furthermore, a very promising application could be found with respect to wet fine grinding processes in stirred media mills. In fact, the approach was utilized to individually determine the particle size distribution of the grinding media wear within an ultrafine organic product. Despite the low quantity of wear particles, it was possible to separate them from the organic product under appropriate density conditions. The size distributions of both the wear and the product particles were validated with SEM images, confirming the feasibility of the method.show moreshow less

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Metadaten
Author:Christoph Peppersack, Arno Kwade, Sandra Breitung-FaesORCiD
DOI:https://doi.org/10.1016/j.apt.2021.09.010
ISSN:0921-8831
Parent Title (English):Advanced Powder Technology
Publisher:Elsevier BV
Document Type:Article
Language:English
Release Date:2024/08/15
Tag:Differential centrifugal sedimentation; Grinding media wear; Heterogeneous mixtures; Selective particle size analysis; Stirred media milling
Volume:32
Issue:11
Pagenumber:9
First Page:4049
Last Page:4057
institutes:Fakultät Verfahrenstechnik
Research Themes:Materialien & Produktionstechnik
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