Salvinia-like slippery surface with stable and mobile water/air contact line

Superhydrophobic surfaces are widely used in many industrial settings, and mainly consist of rough solid protrusions that entrap air to minimize the liquid/solid area. The stability of the superhydrophobic state favors relatively small spacing between protrusions. However, this in turn increases the lateral adhesion force that retards the mobility of drops. Here we propose a novel approach that optimizes both properties simultaneously. Inspired by the hydrophobic leaves of Salvinia molesta and the slippery Nepenthes pitcher plants, we designed a Salvinia-like slippery surface (SSS) consisting of protrusions with slippery heads. We demonstrate that compared to a control surface, the SSS exhibits increased stability against pressure and impact, and enhanced lateral mobility of water drops as well as reduced hydrodynamic drag. We also systematically investigate the wetting dynamics on the SSS. With its easy fabrication and enhanced performance, we envision that SSS will be useful in a variety of fields in industry.     

梨小食心虫对黄冠梨的危害及防治措施

针对近几年梨小食心虫在衡水市的危害情况,根据该虫的生活习性、形态特征、为害症状和发生规律,提出了在不同时期采取梨果套袋、农业防治、物理机械防治、生物防治和化学防治等综合性防治措施。