Studies on the influence of surface morphology of ZnO nail beds on easy roll off of water droplets

Abstract

A ZnO nanorods based superhydrophobic surface with extremely low roll-off values is fabricated using a two-step solution based approach-Successive Ionic Layer Adsorption and Reaction (SILAR) and Chemical Bath Deposition (CBD). The grown ZnO nanorods have average diameter of 285 nm with a predominant growth direction of [002]. The static contact angle of ZnO nanorods superhydrophobic surface is 155°, and the dynamic contact angles such as contact angle hysteresis and roll-off angle is 2° and 1° respectively. Furthermore, to comprehend the mechanism governing the extremely low roll-off angle of ZnO nanorods based superhydrophobic surface, Aan analytical model has been developed by incorporating the topographical (diameter, density of nanorods and solid area fraction) and droplet parameters (surface tension, mass and volume) to understand the mechanism associated with the extremely low roll-off angle of ZnO nanorods based superhydrophobic surface. The theoretically calculated roll-off angle closely matches with the experimental results and other reported results reported in the literature.

Electric heated cotton fabrics with durable conductivity and self-cleaning properties

“…These surfaces can be cleaned by water droplets even at small slope angles due to their superphydrophobicity. [43][44][45][46][47] This not only prevents the oxidation of polypyrrole by moisture, but also reduces the surface resistivity increase due to contaminants (dirt, soil, etc.) during daily usage.…”

Hierarchical ‘rose-petal’ ZnO/Si surfaces with reversible wettability reaching complete water repellence without chemical modification

“…This depends on the wetting mode of the hierarchical surface, i.e., on the penetration of water into the macro-or nano-roughness, or into both [31]. The "lotus surface" shows a high contact angle and water droplets easily roll off, because air is trapped between the rough surface and water, as described by the Cassie model [32][33][34]. The "rose-petal surface" also shows a high contact angle, but water droplets stick to such a surface without rolling off, even at great tilt angles.…”

Evolution of Temperature-Driven Interfacial Wettability and Surface Energy Properties on Hierarchically Structured Porous Superhydrophobic Pseudoboehmite Thin Films

“…23 It is noteworthy that most of the experimental investigations on the surface energy of superhydrophobic surfaces are restricted to room temperature. 24,25 Recently, the effect of temperature on the superhydrophobic surface has attracted considerable interest because of their potential applications in electrosurgical instruments, solar cover glass applications, energy-saving windows, hot-water pipelines, and so forth. 26 In these applications, temperature plays a critical role in the intermolecular forces between solid/ liquid interactions and affects the three-phase contact related to superhydrophobicity.…”

“…The hydrophobicity of the coating is mainly attributed to the enrichment of nonpolar moieties . It is noteworthy that most of the experimental investigations on the surface energy of superhydrophobic surfaces are restricted to room temperature. , Recently, the effect of temperature on the superhydrophobic surface has attracted considerable interest because of their potential applications in electrosurgical instruments, solar cover glass applications, energy-saving windows, hot-water pipelines, and so forth . In these applications, temperature plays a critical role in the intermolecular forces between solid/liquid interactions and affects the three-phase contact related to superhydrophobicity. , Very few investigations have been reported to understand the effect of temperature on the wetting properties of the solid surface. − Dallin et al studied the temperature dependence of hydrophobic interactions between nonpolar surfaces and water using both simulations and experiments .…”