NDLI: Effects of liquid surface tension on gas capillaries and capillary forces at superamphiphobic surfaces.

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Effects of liquid surface tension on gas capillaries and capillary forces at superamphiphobic surfaces.

Content Provider	Europe PMC
Author	Eriksson, Mimmi Claesson, Per M. Järn, Mikael Wallqvist, Viveca Tuominen, Mikko Kappl, Michael Teisala, Hannu Vollmer, Doris Schoelkopf, Joachim Gane, Patrick A. C. Mäkelä, Jyrki M. Swerin, Agne
Abstract	The formation of a bridging gas capillary between superhydrophobic surfaces in water gives rise to strongly attractive interactions ranging up to several micrometers on separation. However, most liquids used in materials research are oil-based or contain surfactants. Superamphiphobic surfaces repel both water and low-surface-tension liquids. To control the interactions between a superamphiphobic surface and a particle, it needs to be resolved whether and how gas capillaries form in non-polar and low-surface-tension liquids. Such insight will aid advanced functional materials development. Here, we combine laser scanning confocal imaging and colloidal probe atomic force microscopy to elucidate the interaction between a superamphiphobic surface and a hydrophobic microparticle in three liquids with different surface tensions: water (73 mN m^-1), ethylene glycol (48 mN m^-1) and hexadecane (27 mN m^-1). We show that bridging gas capillaries are formed in all three liquids. Force-distance curves between the superamphiphobic surface and the particle reveal strong attractive interactions, where the range and magnitude decrease with liquid surface tension. Comparison of free energy calculations based on the capillary menisci shapes and the force measurements suggest that under our dynamic measurements the gas pressure in the capillary is slightly below ambient.
Journal	Scientific Reports [Sci Rep]
Volume Number	13
DOI	10.1038/s41598-023-33875-9
PubMed Central reference number	PMC10133270
Issue Number	1
PubMed reference number	37100810
e-ISSN	20452322
Language	English
Publisher	Nature Publishing Group
Publisher Date	2023-04-26
Publisher Place	London
Access Restriction	Open
Subject Keyword	Chemical physics Thermodynamics
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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