Issue 6, 2011

Laser-treated hydrophobic paper: an inexpensive microfluidic platform

Abstract

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

Article information

Article type
Technical Note
Submitted
15 Oct 2010
Accepted
16 Dec 2010
First published
24 Jan 2011

Lab Chip, 2011,11, 1161-1165

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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