Evolution of and Disparity among Biomimetic Superhydrophobic Surfaces with Gecko, Petal, and Lotus Effect

Abstract

It is desirable to turn one kind of superhydrophobic (SHPO) surfaces into another by changing surface topography alone and attaining solid surfaces with tunable properties. Herein, gecko‐, petal‐, and lotus‐like SHPO surfaces, composed of ZnO tetrapods and polydimethylsiloxane, are realized by adjusting the roughness factor and length scale of roughness, while keeping the surface chemistry the same. Afterward, water droplet sliding and impacting are investigated. The surfaces behave similarly in spreading but deviate from each other in sliding, receding, jetting, and rebounding due to their different adhesive properties. Moreover, the disparity between surfaces with petal and lotus effects is well explained by Furmidge's and Young–Dupre equations. On the other hand, these formulas fail to elucidate the surface with gecko effect because of its inside sealed air that produces negative pressure upon droplet motion. This paper provides a facile topography evolution path and a manifest correlation between topography and performance in water droplet dynamics for SHPO surfaces with gecko, petal, and lotus effects.

Dense and superhydrophobic biopolymer-coated large tablet produced with energy efficient UV-curing for controlled-release fertilizer

“…S7gi †). These results show that DSBCF had a superhydrophobic coating with high adhesion, introducing a petal effect, 54,55 and has excellent exibility. All these ensure that the coating would not be expanded and damaged by the accumulation of water under the diffusion release mechanism.…”

Long-Lasting Self-Healing Surface Dewettability through the Rapid Regeneration of Surface Morphologies

“…It should be noted that, in contrast to previous studies, − we could not achieve specific 3D nanostructures such as nanofibers and nanofilaments but instead produced topographically featureless microstructures (Figure E,F). Unfortunately, in the present case, the water droplets tended to pin to the sample surfaces (average roll-off angle of 50 μL water was about 19°) even though water CAs were over 150°, suggesting that our sample surfaces demonstrated Wenzel’s dewetting behavior. − …”

Design of a Super-Liquid Crystal-Phobic Coating for Immobilizing Liquid Crystal μ-Droplets─Without Affecting Their Sensitivity

“…In the past, the adhesiveness of the beaded droplet of water on superhydrophobic interfaces was customized through controlled tailoring of surface roughness. 33,34 However, in this current demonstration, the adhesiveness of the beaded LC droplet on the multilayer coating was mainly tuned through the strategic association of dual chemical modifications, as shown in Figure 3A. To control the adhesive interaction between a beaded LC droplet and underwater super-LCphobic coating, the glucamine-modified multilayer was further post-modified with selected hydrophobic alkyl acrylates through a 1,4-conjugate addition reaction between residual amines of the multilayer coating and the acrylate group of selected alkyl acrylate (Figure 3A).…”