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Issue 17, 2010
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Sodium hydroxide treatment of PDMS based microfluidic devices

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Abstract

We discuss the use of aqueous NaOH as a facile surface treatment method to control the electroosmotic flow in PDMS microchannels. Flushing of PDMS/PDMS and glass/PDMS microchannels with 1 M NaOH for 24 h leads to a doubling of the electroosmotic flow. This high flow rate is comparable to the flow rates achieved by treating PDMS microchannels with O2 plasma. Contact angle measurements and ATR-FTIR analysis show that the surface chemistry of the NaOH treated PDMS differs from O2 plasma treated PDMS. An important advantage of the NaOH treated surfaces is the enhanced stability, irrespective of whether the devices are stored in air or water.

Graphical abstract: Sodium hydroxide treatment of PDMS based microfluidic devices

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Article information


Submitted
30 Mar 2010
Accepted
11 Jun 2010
First published
06 Jul 2010

Lab Chip, 2010,10, 2283-2285
Article type
Technical Note

Sodium hydroxide treatment of PDMS based microfluidic devices

I. Hoek, F. Tho and W. M. Arnold, Lab Chip, 2010, 10, 2283
DOI: 10.1039/C004769D

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