Document Type
Article
Publication Date
2022
DOI
10.1111/jace.18527
Publication Title
Journal of the American Ceramic Society
Volume
105
Issue
9
Pages
5598-5610
Abstract
The role of high-frequency alternating current (AC) electric field in the assembly of alumina particles in aqueous media was investigated. Field–particle interactions were in situ investigated for coarse and fine powder particles in very dilute suspensions. For both coarse and fine particles, AC field-induced assembly led to the formation of chains of particles within a minute, which were aligned in the field direction. However, a much finer network of particle chains evolved in fine particle suspensions. Threshold field strength for chain formation was also lower for fine particles (28 V/mm) than for coarse particles (50 V/mm), suggesting stronger interactions for finer particles. Chain length increased with both field strength and field duration. Chain formation was attributed to mutual dielectrophoretic (DEP) interaction forces. Increase in DEP forces with field strength resulted in enhanced interactions. For finer particles, decreasing interparticle distance might have favored stronger interactions. Suspension microstructure was disrupted as soon as the field was removed. However, higher field duration was associated with an improved pattern stability and retention following the field removal. Finally, particle motion was studied in deliberately applied spatially nonuniform AC field, which revealed different mechanisms of chain formation for coarse (negative-DEP) and fine (positive-DEP) particles.
Original Publication Citation
John, J. E., Qian, S., & Ghosh, D. (2022). Assembly of alumina particles in aqueous suspensions induced by high‐frequency AC electric field. Journal of the American Ceramic Society, 105(9), 5598-5610. https://doi.org/10.1111/jace.18527
Repository Citation
John, James E.; Qian, Shizhi; and Ghosh, Dipankar, "Assembly of Alumina Particles in Aqueous Suspensions Induced by High‐Frequency AC Electric Field" (2022). Mechanical & Aerospace Engineering Faculty Publications. 113.
https://digitalcommons.odu.edu/mae_fac_pubs/113
Included in
Ceramic Materials Commons, Electrical and Electronics Commons, Electro-Mechanical Systems Commons
Comments
© 2022 The Authors.
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