Solvent segregation and capillary evaporation at a superhydrophobic surface investigated by confocal Raman microscopy and force measurements

Brandner, Birgit D.; Hansson, Petra; Swerin, Agne; Claesson, Per M.; Wåhlander, Martin; Schoelkopf, Joachim; Gane, Patrick

doi:10.1039/c0sm00704h

Cited by 28 publications

(23 citation statements)

References 43 publications

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“…Depletion of water from a superhydrophobic surface has previously been detected using confocal Raman microscopy in which air or possibly water vapor was seen to accumulate close to the surface. 23 The immersion time did not affect the appearance of the surface and also after using ethanol as a wetting agent the surface displayed a shiny interface.…”

Section: Surface and Probe Propertiesmentioning

confidence: 99%

“…Previously, similar behavior was noted during force measurements between rough particle-coated surfaces having contact angles <150° and also by using superhydrophobic surfaces. 23,30,65 We here present its occurrence for two superhydrophobic surfaces as well as statistical data. Rough features hosting excess air/vapor are a prerequisite for this long-range type of force curve to form, i.e.…”

Section: Interaction Forces Involving Hydrophobic and Superhydrophobimentioning

confidence: 99%

“…14-19 Further evidence for cavitation being the main underlying mechanism is provided by observing the similarities of interactions between hydrophobic surfaces in water and capillary forces between a hydrophilic surface in air as well as by imaging air cavities next to a hydrophobic surface. [20][21][22][23] The existence and stability of nanobubbles close to hydrophobic surfaces have also been proven on numerous occasions. [24][25][26][27][28] The importance of hydrophobicity for bubble attachment to surfaces was also recently reported by Shi et al 29 Singh et al report long-range (>1 μm) interactions between superhydrophobic surfaces due to cavitation but find no evidence for nanobubbles 30 and instead suggest the cavities being due to properties of confined water in line with thermodynamic conclusions.…”

Section: Introductionmentioning

confidence: 98%

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Superhydrophobicity: Cavity growth and wetting transition

Wåhlander

Hansson-Mille²,

Swerin

2015

Journal of Colloid and Interface Science

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Section: Surface and Probe Propertiesmentioning

confidence: 99%

Section: Interaction Forces Involving Hydrophobic and Superhydrophobimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Superhydrophobicity: Cavity growth and wetting transition

Wåhlander

Hansson-Mille²,

Swerin

2015

Journal of Colloid and Interface Science

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“…The existence of the air films has been confirmed visibly 105,106 and by confocal Raman spectroscopy. 107 ( Fig. 13a).…”

Section: Mechanistic Aspectsmentioning

confidence: 99%

Superhydrophobic surfaces for corrosion protection: a review of recent progresses and future directions

et al. 2015

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Due to their superior water-repelling effects, superhydrophobic surfaces have received increasing attention as a promising solution to corrosion of metallic materials. The present article introduces the fundamental theories behind superhydrophobicity followed by a comprehensive review of the recent progresses of this rapidly growing field over the past 5 years. A critical discussion over anticorrosion mechanisms of superhydrophobic surfaces is also provided. For many realistic applications, future efforts are pressingly demanded to prolong the corrosion resistance of these superhydrophobic surfaces. To this end, several important strategies and examples in designing stable, selfhealable, or inhibitor-loaded superhydrophobic surfaces are discussed.

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“…When submerging superhydrophobic materials in saline solutions, an air film is captured between the nanostructures of the surface [44,45,46]. This trapped air film reduces the fraction of the surface effectively in contact with the fluid.…”

Section: Discussionmentioning

confidence: 99%

Surface Nanostructuring of Parylene-C Coatings for Blood Contacting Implants

et al. 2018

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This paper investigates the effects on the blood compatibility of surface nanostructuring of Parylene-C coating. The proposed technique, based on the consecutive use of O2 and SF6 plasma, alters the surface roughness and enhances the intrinsic hydrophobicity of Parylene-C. The degree of hydrophobicity of the prepared surface can be precisely controlled by opportunely adjusting the plasma exposure times. Static contact angle measurements, performed on treated Parylene-C, showed a maximum contact angle of 158°. The nanostructured Parylene-C retained its hydrophobicity up to 45 days, when stored in a dry environment. Storing the samples in a body-mimicking solution caused the contact angle to progressively decrease. However, at the end of the measurement, the plasma treated surfaces still exhibited a higher hydrophobicity than the untreated counterparts. The proposed treatment improved the performance of the polymer as a water diffusion barrier in a body simulating environment. Modifying the nanotopography of the polymer influences the adsorption of different blood plasma proteins. The adsorption of albumin—a platelet adhesion inhibitor—and of fibrinogen—a platelet adhesion promoter—was studied by fluorescence microscopy. The adsorption capacity increased monotonically with increasing hydrophobicity for both studied proteins. The effect on albumin adsorption was considerably higher than on fibrinogen. Study of the proteins simultaneous adsorption showed that the albumin to fibrinogen adsorbed ratio increases with substrate hydrophobicity, suggesting lower thrombogenicity of the nanostructured surfaces. Animal experiments proved that the treated surfaces did not trigger any blood clot or thrombus formation when directly exposed to the arterial blood flow. The findings above, together with the exceptional mechanical and insulation properties of Parylene-C, support its use for packaging implants chronically exposed to the blood flow.

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Solvent segregation and capillary evaporation at a superhydrophobic surface investigated by confocal Raman microscopy and force measurements

Cited by 28 publications

References 43 publications

Superhydrophobicity: Cavity growth and wetting transition

Superhydrophobicity: Cavity growth and wetting transition

Superhydrophobic surfaces for corrosion protection: a review of recent progresses and future directions

Surface Nanostructuring of Parylene-C Coatings for Blood Contacting Implants

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