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Journal of Nanomaterials
Volume 2016, Article ID 7061838, 7 pages
Research Article

An Analysis of Nanoparticle Settling Times in Liquids

1Department of Mechanical and Manufacturing Engineering, University of Ruhuna, Galle, Sri Lanka
2Department of Mathematics, University of Peradeniya, Kandy, Sri Lanka
3Sri Lanka Institute of Nanotechnology, Colombo, Sri Lanka

Received 10 September 2015; Revised 28 December 2015; Accepted 6 January 2016

Academic Editor: P. Davide Cozzoli

Copyright © 2016 D. D. Liyanage et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Aggregation and settling are crucial phenomena involving particle suspensions. For suspensions with larger than millimeter-size particles, there are fairly accurate tools to predict settling rates. However for smaller particles, in particular micro-to-nanosizes, there is a gap in knowledge. This paper develops an analytical method to predict the settling rates of micro-to-nanosized particle suspensions. The method is a combination of classical equations and graphical methods. Validated using the experimental data in literature, it was found that the new method shows an order of magnitude accuracy. A remarkable feature of this method is its ability to accommodate aggregates of nonspherical shapes and of different fractal dimensions.