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Download fileBreak-up of nano-particle agglomerates by hydrodynamically limited processes
journal contribution
posted on 2008-10-16, 14:54 authored by L. Xie, Chris RiellyChris Rielly, Gul Ozcan-TaskinGul Ozcan-TaskinWhen dry nano-particulate powders are first added into a liquid, clusters as large
as hundreds of microns can be formed. In this study, high shear impellers, such as the
sawtooth Ekatomizer and rotor-stator impellers were used to suspend and break-up
these agglomerates in a stirred vessel. The high local energy dissipation rates generated
by these impeller could slowly break up clusters to sub-micron sizes by an erosional
mechanism. In comparison, single and multiple passes through a valve homogeniser
could quickly break the nano-particle clusters to sub-micron sizes; single pass operation
had the highest breakage efficiency for a given specific energy input. For both
equipment types, the rate of fines generation was found to be controlled by the
maximum energy dissipation rate. However, the size of the fine aggregates produced
was a constant and was not a function of the energy dissipation rate.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Chemical Engineering
Citation
XIE, L., RIELLY, C.D., ÖZCAN-TAŞKIN, G., 2008. Break-up of nano-particle agglomerates by hydrodynamically limited processes. Journal of Dispersion Science and Technology, 29 (4), pp. 573-569Publisher
© Taylor & FrancisPublication date
2008Notes
This article was published in the journal, Journal of Dispersion Science and Technology [© Taylor & Francis] and the definitive version is available at: http://dx.doi.org/10.1080/01932690701729211ISSN
0193-2691;1532-2351Language
- en