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. 2015 Jun 4;15(6):12983–12998. doi: 10.3390/s150612983

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© 2015 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).

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Optical microscope image of columnar particles magnetically captured by nano-sized particles immobilized on the surface of the substrate. Adapted from [8].