Bioinspired Superwettability Materials

Abstract

Naturally occurring structures such as spider silks, cactus spine, dandelion pappi, lotus leaves, butterfly wings, rose petals, gecko feet, and desert beetles possess unique properties and outstanding wettability characteristics, which are not yet well understood, but may provide inspiration for construction of superwettability materials. The focus of this article is on recent progress in application of bioinspired superwettability materials for diverse uses ranging from nanofibers, self‐cleaning materials, and chemical reaction interfaces to oil–water separation, patterning, and printing. The article begins by introducing one‐ and two‐dimensional naturally occurring structures with superwettability properties. Then, the fundamental principles of superwetting materials are discussed, followed by classification of superwettability materials based on the medium. The article discusses in detail the recent progress in application of bioinspired materials and provides a short conclusion and perspective.

Cell Response on Laser-Patterned Ti/Zr/Ti and Ti/Cu/Ti Multilayer Systems

“…Following Berg's limits based on the measurements of hydrophobic forces [50,51], it can be concluded that the Ti/Zr/Ti/Si and Ti/Cu/Ti/Si thin films are supported by hydrophobic forces and are less water wettable. Due to the energetically beneficial displacement of solutes from the solution into the interphase between solid and solute phases, hydrophobic surfaces facilitate the adsorption of various surfactants and proteins from water [52]. When important measures of biological activity responsive to interfacial phenomena are related to the water adhesion tension of the contacting surfaces, it becomes clear that the physicochemical properties of the interfacial water have a strong influence on the biological response to materials.…”

Self-Healing Superwetting Surfaces, Their Fabrications, and Properties

“…Nepenthe’s pitcher leaves exhibit a “slippery liquid-infused porous surface” (SLIPS) based on a different mechanism from the superhydrophobic lotus leaf. Nepenthe leaves have microtextured peristomes or rims filled with an intermediary liquid. ,− The trapped liquid cushion on the pitcher plant surface repels immiscible liquids of almost any surface tension. It makes the surface very slippery to insects.…”