Direct Observation of Gas Meniscus Formation on a Superhydrophobic Surface

Mimmi Eriksson*, Mikko Tuominen, Mikael Järn, Per Martin Claesson, Viveca Wallqvist, Hans Jürgen Butt, Doris Vollmer, Michael Kappl, Joachim Schoelkopf, Patrick A.C. Gane, Hannu Teisala, Agne Swerin

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

6 Sitaatiot (Scopus)

Abstrakti

The formation of a bridging gas meniscus via cavitation or nanobubbles is considered the most likely origin of the submicrometer long-range attractive forces measured between hydrophobic surfaces in aqueous solution. However, the dynamics of the formation and evolution of the gas meniscus is still under debate, in particular, in the presence of a thin air layer on a superhydrophobic surface. On superhydrophobic surfaces the range can even exceed 10 μm. Here, we report microscopic images of the formation and growth of a gas meniscus during force measurements between a superhydrophobic surface and a hydrophobic microsphere immersed in water. This is achieved by combining laser scanning confocal microscopy and colloidal probe atomic force microscopy. The configuration allows determination of the volume and shape of the meniscus, together with direct calculation of the Young-Laplace capillary pressure. The long-range attractive interactions acting on separation are due to meniscus formation and volume growth as air is transported from the surface layer.

AlkuperäiskieliEnglanti
Sivut2246-2252
Sivumäärä7
JulkaisuACS Nano
Vuosikerta13
Numero2
DOI - pysyväislinkit
TilaJulkaistu - 26 helmikuuta 2019
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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  • Siteeraa tätä

    Eriksson, M., Tuominen, M., Järn, M., Claesson, P. M., Wallqvist, V., Butt, H. J., ... Swerin, A. (2019). Direct Observation of Gas Meniscus Formation on a Superhydrophobic Surface. ACS Nano, 13(2), 2246-2252. https://doi.org/10.1021/acsnano.8b08922