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Issue 4, 2011
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High-density fabrication of normally closed microfluidic valves by patterned deactivation of oxidized polydimethylsiloxane

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Abstract

The use of polydimethylsiloxane (PDMS) in microfluidic devices is extensive in academic research. One of the most fundamental treatments is to expose PDMS to plasma oxidation in order to render its surface temporarily hydrophilic and capable of permanent bonding. Here, we show that changes in the surface chemistry induced by plasma oxidation can spatially be counteracted very cleanly and reliably in a scalable manner by subsequent microcontact printing of residual oligomers from a PDMS stamp. We characterize the surface modifications through contact angle, atomic force microscopy, X-ray photoelectron spectroscopy, and bond-strength measurements. We utilize this approach for negating the bonding of a flexible membrane layer within an elastomeric valve and demonstrate its effectiveness by integration of over one thousand normally closed elastomeric valves within a single substrate. In addition, we demonstrate that surface energy patterning can be used for “open microfluidic” applications that utilize spatial control of surface wetting.

Graphical abstract: High-density fabrication of normally closed microfluidic valves by patterned deactivation of oxidized polydimethylsiloxane

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Supplementary files

Article information


Submitted
15 Jun 2010
Accepted
10 Nov 2010
First published
06 Dec 2010

Lab Chip, 2011,11, 738-742
Article type
Technical Note

High-density fabrication of normally closed microfluidic valves by patterned deactivation of oxidized polydimethylsiloxane

B. Mosadegh, H. Tavana, S. C. Lesher-Perez and S. Takayama, Lab Chip, 2011, 11, 738
DOI: 10.1039/C0LC00112K

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