ArticleNano letters2026
Hydrophobicity Does Not Affect Water Slip: Insights from Slip Length Mapping.
Article in Nano letters, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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5 authors.
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Abstract
While slip at solid-water interfaces has attracted broad interest, slip lengths reported in experiments─especially on hydrophobic surfaces (i.e., contact angles >90°)─vary widely due to surface topographical and chemical heterogeneity, hindering quantitative understanding of the true slip length. Using highly sensitive frequency-modulation atomic force microscopy, we achieved simultaneous nanoscale mapping of slip length and surface topography, with a 159-fold improvement in slip length detection sensitivity. True slip lengths measured on flat regions of various substrates were found to be almost zero, following a scaling rule predicted by molecular dynamics simulations. As the only exception, a large slip length of 43.2 ± 5.8 nm was measured on graphite in deionized water, but it vanished upon immersion in electrolyte solutions. This unique behavior was rationalized by graphite's atomic-scale smoothness, chemical homogeneity, and ion adsorption. Our method experimentally advances a unified picture of fluid slip.
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