Fig. 7: Droplet Probe Atomic Force Microscopy method.
From: Probing surface wetting across multiple force, length and time scales
By attaching (a) a water or (b) an oil microdroplet to a tipless AFM cantilever, we can characterize the wetting properties of superhydrophobic and underwater superoleophobic surfaces, respectively. c Typical force curve for a water droplet contacting a superhydrophobic butterfly wing. Reprinted with permission from ref. 45. d The corresponding force curves for an oil droplet contacting superoleophobic hydrated brush surfaces under DI water and 0.5 M salt solution. Reprinted with permission from ref. 115. e Mapping wetting variations due to topographical heterogeneities on a superhydrophobic surface. The white outline shows the micropillar structure. Scale bar is 2 μm. Reprinted with permission from ref. 45. f Mapping wetting variations arising from chemical heterogeneities. Scale bar is 5 μm. Reprinted with permission from ref. 85.
