Droplet Friction on Superhydrophobic Surfaces Scales With Liquid-Solid Contact Fraction.

ABSTRACT: It is generally assumed that contact angle hysteresis of superhydrophobic surfaces scales with liquid-solid contact fraction, however, its experimental verification has been problematic due to the limited accuracy of contact angle and sliding angle goniometry. Advances in cantilever-based friction probes enable accurate droplet friction measurements down to the nanonewton regime, thus suiting much better for characterizing the wetting of superhydrophobic surfaces than contact angle hysteresis measurements. This work quantifies the relationship between droplet friction and liquid-solid contact fraction, through theory and experimental validation. Well-defined micropillar and microcone structures are used as model surfaces to provide a wide range of different liquid-solid contact fractions.

SUBMITTER: Lepikko S 

PROVIDER: S-EPMC11840469 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature