Difference between revisions of "Photoreactive coating for high-contrast spatial patterning of microfluidic device wettability"

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[[Image:photofig2.png|thumb|right|400px|'''Fig. 1''' SEM images of channel cross sections; scale bars denote 5 mm. (a)
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Uncoated PDMS channel cross-section and (b) magnified view of upper
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right corner. (c) Coated, PAA functionalized PDMS channel and (d)
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magnified view of upper right corner; the corner is rounded because the
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sol–gel wets the surface and collects in regions of high curvature.]]
  
[[Image:photofig1.png|thumb|left|400px|'''Fig. 1''' Contact angle measurement of water droplets in air on (a) sol–gel
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[[Image:photofig1.png|thumb|left|400px|'''Fig. 2''' Contact angle measurement of water droplets in air on (a) sol–gel
 
coated substrate with contact angle 105 deg and (b) PAA grafted substrate
 
coated substrate with contact angle 105 deg and (b) PAA grafted substrate
 
with contact angle 22 deg. AFM images of (c) sol–gel coated and (d) PAA
 
with contact angle 22 deg. AFM images of (c) sol–gel coated and (d) PAA

Revision as of 13:57, 1 March 2009

Photoreactive coating for high-contrast spatial patterning of microfluidic device wettability

Authors: Adam R. Abate, Amber T. Krummel, Daeyeon Lee, Manuel Marquez, Christian Holtzed and David A. Weitz

Lab Chip, 2008, 8, 2157–2160

Soft matter keywords

By Alex Epstein


Abstract from the original paper

For many applications in microfluidics, the wettability of the devices must be spatially controlled. We introduce a photoreactive sol–gel coating that enables high-contrast spatial patterning of microfluidic device wettability.

Soft matters

Fig. 1 SEM images of channel cross sections; scale bars denote 5 mm. (a) Uncoated PDMS channel cross-section and (b) magnified view of upper right corner. (c) Coated, PAA functionalized PDMS channel and (d) magnified view of upper right corner; the corner is rounded because the sol–gel wets the surface and collects in regions of high curvature.
Fig. 2 Contact angle measurement of water droplets in air on (a) sol–gel coated substrate with contact angle 105 deg and (b) PAA grafted substrate with contact angle 22 deg. AFM images of (c) sol–gel coated and (d) PAA grafted microchannels. The images show a 10 deg 20 mm area at high resolution; the dark to light color scale maps to feature heights of -150 to 150 nm. (e) Surface concentrations of atoms on sol–gel coated and PAA functionalized substrates, measured with XPS; fluorine (F 1s), oxygen (O 1s), carbon (C 1s), and silicon (Si 2s).