Mapping micrometer-scale wetting properties of superhydrophobic surfaces

Dan Daniel, Chee Leng Lay, Anqi Sng, Coryl Jing Jun Lee, Darren Chi Jin Neo, Xing Yi Ling, Nikodem Tomczak

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

There is a huge interest in developing superrepellent surfaces for antifouling and heat-transfer applications. To characterize the wetting properties of such surfaces, the most common approach is to place a millimetric-sized droplet and measure its contact angles. The adhesion and friction forces can then be inferred indirectly using Furmidge’s relation. While easy to implement, contact angle measurements are semiquantitative and cannot resolve wetting variations on a surface. Here, we attach a micrometric-sized droplet to an atomic force microscope cantilever to directly measure adhesion and friction forces with nanonewton force resolutions. We spatially map the micrometer-scale wetting properties of superhydrophobic surfaces and observe the time-resolved pinning–depinning dynamics as the droplet detaches from or moves across the surface.
Original languageEnglish (US)
Pages (from-to)25008-25012
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume116
Issue number50
DOIs
StatePublished - Jan 1 2019
Externally publishedYes

Bibliographical note

Generated from Scopus record by KAUST IRTS on 2023-02-14

ASJC Scopus subject areas

  • General

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