Hierarchical, plasma nanotextured, robust superamphiphobic polymeric surfaces structurally stabilized through a wetting-drying cycle

Gnanappa, AK; Papageorgiou, DP; Gogolides, E; Tserepi, A; Papathanasiou, AG; Boudouvis, AG

dc.contributor.author	Gnanappa, AK	en
dc.contributor.author	Papageorgiou, DP	en
dc.contributor.author	Gogolides, E	en
dc.contributor.author	Tserepi, A	en
dc.contributor.author	Papathanasiou, AG	en
dc.contributor.author	Boudouvis, AG	en
dc.date.accessioned	2014-03-01T02:09:17Z
dc.date.available	2014-03-01T02:09:17Z
dc.date.issued	2012	en
dc.identifier.issn	16128850	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/29796
dc.subject	drop compression test	en
dc.subject	nanowire coalescence	en
dc.subject	superhydrophobic	en
dc.subject	superoleophobic	en
dc.subject	wetting	en
dc.subject.other	Adhesion forces	en
dc.subject.other	Compression tests	en
dc.subject.other	Diiodomethane	en
dc.subject.other	Etched surface	en
dc.subject.other	Fluorocarbon films	en
dc.subject.other	Fluorocarbon layers	en
dc.subject.other	High aspect ratio	en
dc.subject.other	Nano-fibrous	en
dc.subject.other	Nano-texture	en
dc.subject.other	Nanotextured	en
dc.subject.other	Oxygen plasmas	en
dc.subject.other	Polymer surfaces	en
dc.subject.other	Polymeric surfaces	en
dc.subject.other	Soya oil	en
dc.subject.other	Stability issues	en
dc.subject.other	Structural stabilities	en
dc.subject.other	superhydrophobic	en
dc.subject.other	superoleophobic	en
dc.subject.other	Water immersion	en
dc.subject.other	Wetting transitions	en
dc.subject.other	Wetting-drying	en
dc.subject.other	Adhesion	en
dc.subject.other	Aspect ratio	en
dc.subject.other	Coalescence	en
dc.subject.other	Compression testing	en
dc.subject.other	Drops	en
dc.subject.other	Drying	en
dc.subject.other	Hydrophobicity	en
dc.subject.other	Morphology	en
dc.subject.other	Nanowires	en
dc.subject.other	Plasma etching	en
dc.subject.other	Plasmas	en
dc.subject.other	Polymers	en
dc.subject.other	Stability	en
dc.subject.other	Wetting	en
dc.title	Hierarchical, plasma nanotextured, robust superamphiphobic polymeric surfaces structurally stabilized through a wetting-drying cycle	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/ppap.201100124	en
heal.identifier.secondary	http://dx.doi.org/10.1002/ppap.201100124	en
heal.publicationDate	2012	en
heal.abstract	Plasma etched and simultaneously randomly roughened (nanotextured) polymethylmethacrylate (PMMA) substrates show hierarchical roughness and complex high-aspect-ratio morphology. Here, they are investigated as superamphiphobic surfaces, after plasma deposition of a thin fluorocarbon film. Inspired by the need to allow their ""real world"" use, we explore two major stability issues of such superamphiphobic surfaces: (i) the structural stability of the nanotexture against capillary and adhesion forces during successive wetting-drying cycles, and (ii) the thermodynamic stability (robustness) of these surfaces related to the maximum sustainable pressure of the Cassie-Baxter inhomogeneous wetting state. We show that surfaces etched in oxygen plasma up to 4 min (with texture height ≈600 nm) are stable against successive wetting-drying cycles, while surfaces treated for longer time show highly porous nanofibrous morphology which is coalesced and stabilized upon wetting, allowing their potential long-term use. Robust superhydrophobic and superoleophobic behavior is observed in drop compression tests with water (on 2, 4, 10 min plasma etched surfaces) and diiodomethane (on 4 and 10 min plasma etched surfaces), respectively, and no wetting transition is observed for these two liquids even at maximum drop compression possible (1.5 kPa). Robust oleophobic behavior with sticky surfaces is observed for 1 and 2 min etching and with diiodomethane without transition to wetted states even upon maximum compression. On the contrary, wetting transition is observed for soya oil upon repeated compression. High-Aspect-Ratio polymeric nanowires (nanotexture) are formed on polymer surfaces as a result of plasma etching. We overcome their fragility by coalescence after water immersion/drying, and hydrophobize them with a plasma-deposited fluorocarbon layer. Reversible, robust superamphiphobic behavior is observed in drop compression tests with water and diiodomethane at maximum compression possible. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.	en
heal.journalName	Plasma Processes and Polymers	en
dc.identifier.doi	10.1002/ppap.201100124	en
dc.identifier.volume	9	en
dc.identifier.issue	3	en
dc.identifier.spage	304	en
dc.identifier.epage	315	en