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Journal of Nanomaterials
Volume 2007 (2007), Article ID 71259, 4 pages
Research Article

Sorting of Silica Nanocups by Diameter during Fabrication Process

Department of Electrical and Computer Engineering, Texas A&M University, 3128 College Station, TX 77843, USA

Received 15 August 2006; Revised 25 December 2006; Accepted 25 December 2006

Academic Editor: Michael Harris

Copyright © 2007 Parag Deotare and Jun Kameoka. 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.


We demonstrated a new technique to sort nanoparticles based on their dimensions. Due to the interactions between charged droplets and a nonlinear electrostatic field, nanoparticles with different dimensions were deposited at different spatial locations on a given target substrate. By using this principle, we have been able to sort nanocups into three groups with mean diameters of 0.31 μm, 0.7 μm, and 1.1 μm and a standard deviation of 20%. This technique improves the nanoparticle fabrication process not only by decreasing the standard deviation of its dimensions but also by increasing its yield since nanoparticles with different mean diameters can be generated at the same time.