Superoleophobic Coatings with Ultralow Sliding Angles Based on Silicone Nanofilaments

A superoleophobic textile repellent towards impacting drops of alkanes

“…The existence and stability of a plastron layer in the low surface tension organic solvent hexadecane is remarkable. To our knowledge this is the first 9 demonstration of a stable large area plastron layer between a superoleophobic textile surface and an organic solvent with a low surface tension [15,16]. According to the shedding angles this result underlines the outstanding superoleophobic properties of this kind of sample.…”

“…Due to the highly multi-valued topography of the SNF coating and the dense packing of nanometre-sized filaments, the coating matches all criteria for superoleophobicity after additional reduction of the surface energy by fluorination. This has been demonstrated by wet chemical fluorination of SNF coated glass e. g. with decane 3 [16]. In this work we report a textile with outstanding superoleophobic properties.…”

“…This can be concluded from contact angle data which have been measured on flat glass substrates coated with fluorinated SNF [16]. Contact angles well above 150° and sliding angles below 5° are reported for several solvents with low surface tension, also hexadecane.…”

“…Third, the surface energy of the substrate should be as low as possible [7,8,11]. Due to these quite intricate prerequisites up to now only a few surfaces have been reported on which low surface tension liquids such as hexadecane (γ = 27 mNm -1 ) [12][13][14][15][16], dodecane (γ = 24.9 mNm -1 ) [16,17], decane (γ = 23.4 mNm -1 ) [16], ethanol (γ = 22 mNm -1 ) [9], silicone oil (γ = 22 mNm -1 ) [14] or octane (γ = 21.1 mNm -1 ) [8] show superoleophobicity, meaning apparent contact angles above 150° and low sliding angles.…”

Recent developments in polymeric superoleophobic surfaces

“…Furthermore, depending on the type of gas, fluoroelements can be easily introduced in the surface, 67,70,[94][95][96] which is a simple way to modify a surface with low surface energy compounds.…”