Frontal vitrification of PDMS using air plasma and consequences for surface wrinkling

Soft Matter
Manuela NaniaJoão T Cabral

Abstract

We study the surface oxidation of polydimethylsiloxane (PDMS) by air plasma exposure and its implications for the mechanically-induced surface wrinkling of the resulting glass-elastomer bilayers. The effect of plasma frequency (kHz and MHz), oxygen content (from O2 to air), pressure (0.5 ≤ P ≤ 1.5 mbar), as well as exposure time and power, is quantified in terms of the resulting glassy skin thickness h, inferred from wrinkling experiments. The glassy skin thickness is found to increase logarithmically with an exposure time t, for different induction powers p, and all data collapse in terms of a plasma dose, D ≡ p × t. The kinetics of film propagation are found to increase with the oxygen molar fraction yO2 and decrease with the gas pressure P, allowing both the wrinkling wavelength λ and amplitude A to be effectively controlled by gas pressure and composition. A generalised relationship for frontal vitrification is obtained by re-scaling all λ and h data by D/P. A coarse-grained wave propagation model effectively describes and quantifies the process stages (induction, skin formation and propagation) under all the conditions studied. Equipped with this knowledge, we further expand the capabilities of plasma oxidation for PDMS wr...Continue Reading

References

Apr 3, 2003·Journal of the American Chemical Society·Kyung M Choi, John A Rogers
Apr 19, 2003·Journal of Colloid and Interface Science·Kirill EfimenkoJan Genzer
Jul 13, 2004·Nature Materials·Christopher M StaffordEva E Simonyi
Nov 3, 2004·Langmuir : the ACS Journal of Surfaces and Colloids·João T CabralJack F Douglas
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Jun 28, 2011·Physical Review Letters·Hugues VandeparrePascal Damman

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Citations

Mar 2, 2016·ACS Nano·James L HedrickChad A Mirkin
Feb 26, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Giulia L FerrettiJoão T Cabral
Jan 21, 2017·Nanoscale·Manuela NaniaJoão T Cabral
Jan 18, 2017·Soft Matter·Bekele J Gurmessa, Andrew B Croll
Aug 16, 2018·Soft Matter·Vartika PariharSunando Dasgupta
May 5, 2017·Biomicrofluidics·Junbeom KimKi Wan Bong
Feb 23, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Carmen M González-HenríquezJuan Rodríguez-Hernández
Jan 27, 2019·Nature Communications·Alexandre BeberAurélie Bertin

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