Quantitative characterization of plasma treated PDMS microfluidic substrates by inverse gas chromatography

Mészáros, B. and Járvás, G. and Hajba, L. and Szigeti, M. and Dallos, A. and Guttman, A. (2018) Quantitative characterization of plasma treated PDMS microfluidic substrates by inverse gas chromatography. SENSORS AND ACTUATORS B-CHEMICAL, 258. pp. 1184-1190. ISSN 0925-4005

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Abstract

tThe effect of air plasma exposure time on the surface energies and acid-base characteristics of poly-dimethylsiloxane (PDMS) particles was studied. Polymerized PDMS powder was radio frequency inducedair plasma irradiated for 2–10 s with the power of 500 W. The efficiency of the plasma treatments wasinvestigated by a new generation inverse gas chromatograph, a surface energy analyzer. The dispersivecomponent of surface energy was determined by the Dorris-Gray method describing the van der Waalsinteractions, while the specific component of surface energy expressed the surface ability for Lewis acid-base interactions. It was demonstrated that the air plasma treatment did not affect the dispersive andacidic parts of the surface energy and the change of surface hydrophilicity was caused by the raise of theelectron-donor ability of the PDMS surface, characterized by van Oss-Good-Chaudhury’s base number.The optimal plasma treatment time was found to be 5 s. Analysis of the specific surface energy and acid-base characteristics with respect to exposure time showed that partial to complete hydrophobic recoveryoccurred within 38 h.

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