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Issue 6, 2011
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Laser-treated hydrophobic paper: an inexpensive microfluidic platform

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We report a method for fabricating inexpensive microfluidic platforms on paper using laser treatment. Any paper with a hydrophobic surface coating (e.g., parchment paper, wax paper, palette paper) can be used for this purpose. We were able to selectively modify the surface structure and property (hydrophobic to hydrophilic) of several such papers using a CO2 laser. We created patterns down to a minimum feature size of 62 ± 1 µm. The modified surface exhibited a highly porous structure which helped to trap/localize chemical and biological aqueous reagents for analysis. The treated surfaces were stable over time and were used to self-assemble arrays of aqueous droplets. Furthermore, we selectively deposited silica microparticles on patterned areas to allow lateral diffusion from one end of a channel to the other. Finally, we demonstrated the applicability of this platform to perform chemical reactions using luminol-based hemoglobin detection.

Graphical abstract: Laser-treated hydrophobic paper: an inexpensive microfluidic platform

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Publication details

The article was received on 15 Oct 2010, accepted on 16 Dec 2010 and first published on 24 Jan 2011

Article type: Technical Note
DOI: 10.1039/C0LC00512F
Citation: Lab Chip, 2011,11, 1161-1165
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    Laser-treated hydrophobic paper: an inexpensive microfluidic platform

    G. Chitnis, Z. Ding, C. Chang, C. A. Savran and B. Ziaie, Lab Chip, 2011, 11, 1161
    DOI: 10.1039/C0LC00512F

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