High‐Efficiency Reclamation of Oscillating Energy During Multiple Droplets Impact on Bionic Lotus Surface

Abstract

Droplet bouncing on special wettability surface is common and important in daily life and engineering applications (anti‐icing and drag reduction, etc.). However, there are few studies on the multiple droplets impact and there is a lack of systematic research on the interaction of oscillation and bounce. Here, the impact and oscillation of multiple droplets on the porous superhydrophobic bionic lotus surface are studied by a high‐speed camera system. On the bionic lotus surface (Surf‐1), an impacting droplet can merge another larger sessile droplet and bounce off. Comparing with single droplet impact, it is suggested that multiple droplets impact make more efficient use of the air cushion on the micrometer‐nanometer‐scale binary structure (MNBS) and show the self‐cleaning performance of Surf‐1 better. Moreover, with the theory for damped harmonic oscillators, it is found that Surf‐1 can prolong the oscillation of droplets (last >250 ms) and slow down the attenuation of energy. The energy can be efficiently recycled to the bounce by shortening the droplet impact interval (ti). The fundamental understanding of multiple droplets impact and the reclamation of oscillating energy are beneficial for scientific design of new surface and engineering applications.

Modelling and preparation of composite wrinkled structures on polyester fabric via plasma treatment

“…When the kinetic energy reaches a threshold, the droplet bounces. Eventually, the droplet returns to surface oscillation, and the remaining energy is dissipated (Li et al 2022a).…”

Micro/Nano‐Pores and Anti‐Fingerprint Coating by Vacancy‐Capture and Interface Intelligent Control

“…[14] The method applied to glass by integrating RIE technology with standard an issue accompanied by the coating application process with mechanical stability remains a critical challenge. [29,30] Based on our previous study of bionic PTFE/PPS superhydrophobic coating surfaces with both the porous network and micro-nanoscale binary structure (MNBS), [31] static analysis of anti-icing, [32,33] the dynamics of droplet impact on inclined surfaces, [34,35] and anticorrosive/inhibiting scaling performances, [36,37] nonetheless the fabrication of above polymer coating with hierarchical micro/nanostructures requires high temperature to remove polar functional groups, rendering the coatings' transparency reduced still for the light scattering effect. Therefore, fabricating a low surface energy and nanostructured polymer coating by simple method at room temperature may be a unique direction to develop an application oriented anti-fingerprint coating technology and seldom reported.…”