Journal
SOFT MATTER
Volume 14, Issue 37, Pages 7586-7596Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8sm01070f
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Funding
- King Abdullah University of Science and Technology (KAUST) [URF/1/2621-01-01]
- National Natural Science Foundation of China [11772327, 11642019, 11621202]
- Fundamental Research Funds for the Central Universities [WK2090050041]
- Thousand Young Talents Program of China
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We study the impact of drops onto a flat surface with a nano-particle-based superhydrophobic coating, focusing on the earliest contact using 200 ns time-resolution. A central air-disc is entrapped when the drop impacts the surface, and when the roughness is appropriately accounted for, the height and radial extent of the air-disc follow the scaling laws established for impacts onto smooth surfaces. The roughness also modifies the first contact of the drop around the central air-disc, producing a thick band of micro-bubbles. The initial bubbles within this band coalesce and grow in size. We also infer the presence of an air-film residing inside the microstructure, at radial distances outside the central air-disc. This is manifest by the sudden appearance of microbubbles within a few microseconds after impact. The central air-disc remains pinned on the roughness, unless it is chemically altered to make it superhydrophilic.
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