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Micromachines 2016, 7(3), 34; doi:10.3390/mi7030034

Surface Free Energy Determination of APEX Photosensitive Glass

1
Department of Electrical and Computer Engineering, University of Alabama in Huntsville, Huntsville, AL 35899, USA
2
Department of Chemistry, University of Alabama in Huntsville, Huntsville, AL 35899, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Rolf Wuthrich
Received: 7 January 2016 / Revised: 6 February 2016 / Accepted: 14 February 2016 / Published: 23 February 2016
(This article belongs to the Special Issue Glass Micromachining)
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Abstract

Surface free energy (SFE) plays an important role in microfluidic device operation. Photosensitive glasses such as APEX offer numerous advantages over traditional glasses for microfluidics, yet the SFE for APEX has not been previously reported. We calculate SFE with the Owens/Wendt geometric method by using contact angles measured with the Sessile drop technique. While the total SFE for APEX is found to be similar to traditional microstructurable glasses, the polar component is lower, which is likely attributable to composition. The SFE was modified at each stage of device fabrication, but the SFE of the stock and fully processed glass was found to be approximately the same at a value of 51 mJ·m−2. APEX exhibited inconsistent wetting behavior attributable to an inhomogeneous surface chemical composition. Means to produce more consistent wetting of photosensitive glass for microfluidic applications are discussed. View Full-Text
Keywords: surface free energy; surface tension; contact angle; photosensitive glass; microfluidics surface free energy; surface tension; contact angle; photosensitive glass; microfluidics
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Gaillard, W.R.; Waddell, E.; Williams, J.D. Surface Free Energy Determination of APEX Photosensitive Glass. Micromachines 2016, 7, 34.

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