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. 2016 Jun 3;9(6):446. doi: 10.3390/ma9060446

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© 2016 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 (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

PMC Copyright notice

(A,B) Computer Aided Design (CAD) drawings of the (A) pre-concentrator and (B) a layer of ordered cuboids in the extraction channel; (C) Photograph of the printed device; two flat-bottom female connectors with a piece of Poly Tetra Fluoro-Ethylene (PTFE) tubing were fitted to allow connection to an Flow Injection Analysis (FIA) interface; (D,E) Photographs of the configuration of the ordered cuboids printed without the surrounding of the extraction channel. Reproduced with permission from [54], Copyright (2015) American Chemical Society.