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Author

Takayama, Shuichi
Cell and Microfluidics Lab
Research Interests
  • Bio-MEMS and Microfluidics

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

Cited 19 times inthomson ciCited 17 times inthomson ci
Title
High-density fabrication of normally closed microfluidic valves by patterned deactivation of oxidized polydimethylsiloxane
Author
Mosadegh, BobakTavana, HosseinLesher-Perez, Sasha CaiTakayama, Shuichi
Keywords
CONTACT ANGLES; POLY(DIMETHYLSILOXANE) CONTAMINATION; SOFT LITHOGRAPHY; ANALYSIS SYSTEMS; FLOW-CONTROL; TOF-SIMS; PERFORMANCE; MEMBRANES; SURFACES; ADHESION
Issue Date
2011
Publisher
ROYAL SOC CHEMISTRY
Citation
LAB ON A CHIP, v.11, no.4, pp.738 - 742
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
URI
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DOI
http://dx.doi.org/10.1039/c0lc00112k
ISSN
1473-0197
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