Journal
LANGMUIR
Volume 30, Issue 23, Pages 7030-7036Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la501212b
Keywords
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Funding
- Defense Advanced Research Projects Agency Diagnostics on Demand program [HR0011-12-2-0003]
- Robert A. Welch Foundation [F-0032]
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In this paper we describe a method for three-dimensional wax patterning of microfluidic paper-based analytical devices (mu PADs). The method is rooted in the fundamental details of wax transport in paper and provides a simple way to fabricate complex channel architectures such as hemichannels and fully enclosed channels. We show that three-dimensional mu PADs can be fabricated with half as much paper by using hemichannels rather than ordinary open channels. We also provide evidence that fully enclosed channels are efficiently isolated from the exterior environment, decreasing contamination risks, simplifying the handling of the device, and slowing evaporation of solvents.
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