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Issue 9, 2013
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Rapid patterning of ‘tunable’ hydrophobic valves on disposable microchips by laser printer lithography

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Abstract

We recently defined a method for fabricating multilayer microdevices using poly(ethylene terephthalate) transparency film and printer toner, and showed these could be successfully applied to DNA extraction and amplification (Duarte et al., Anal. Chem. 2011, 83, 5182–5189). Here, we advance the functionality of these microdevices with flow control enabled by hydrophobic valves patterned using laser printer lithography. Laser printer patterning of toner within the microchannel induces a dramatic change in surface hydrophobicity (change in contact angle of DI water from 51° to 111°) with good reproducibility. Moreover, the hydrophobicity of the surface can be controlled by altering the density of the patterned toner via varying the gray-scale setting on the laser printer, which consequently tunes the valve's burst pressure. Toner density provided a larger burst pressure bandwidth (158 ± 18 Pa to 573 ± 16 Pa) than could be achieved by varying channel geometry (492 ± 18 Pa to 573 ± 16 Pa). Finally, we used a series of tuned toner valves (with varied gray-scale) for passive valve-based fluidic transfer in a predictable manner through the architecture of a rotating PeT microdevice. While an elementary demonstration, this presents the possibility for simplistic and cost-effective microdevices with valved fluid flow control to be fabricated using nothing more than a laser printer, a laser cutter and a laminator.

Graphical abstract: Rapid patterning of ‘tunable’ hydrophobic valves on disposable microchips by laser printer lithography

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Publication details

The article was received on 19 Nov 2012, accepted on 11 Feb 2013 and first published on 11 Mar 2013


Article type: Paper
DOI: 10.1039/C3LC41275J
Citation: Lab Chip, 2013,13, 1762-1771
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    Rapid patterning of ‘tunable’ hydrophobic valves on disposable microchips by laser printer lithography

    Y. Ouyang, S. Wang, J. Li, P. S. Riehl, M. Begley and J. P. Landers, Lab Chip, 2013, 13, 1762
    DOI: 10.1039/C3LC41275J

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