Preparation Of Silicone Rubber-based Superhydrophobic Interface Via A Surface Embedding Method Of Micro-Nano Particles

Inspired by nature's design,artificial superhydrophobic materials have drawn considerable attention in both academic research and industrial applications during the last two decades.On the basis of the extreme water-repellency,the artificial interfaces with special wettability have been successfully developed to address the real-world issues including oil-spill cleanup,icing reduction,fluid shielding,drag reduction.At present,there are various preparation methods for superhydrophobic.Common preparation methods include electrochemical deposition,electrospinning,electrospray,chemical etching,phase separation,template,sol-gel,and chemical vapor deposition.These methods have various defects such as complicated preparation methods or large-scale use.The most important thing is that the selection of materials in these methods may be limited to the construction of special structures to achieve superhydrophobicity.From another perspective,It is difficult to produce superhydrophobic materials quickly from any material.(1)Here we present that various micro-/nano-particles can efficiently generate multifunctional superhydrophobic surfaces via a facile “glue + powder”strategy.Differing from the previous understanding of preparing such surface,the intrinsic wettability of embedded particles exerts no influence on the anti-wetting ability of prepared surfaces,for example The surface prepared with hydrophilic silica A200 powder can have a rolling angle and contact angle of 154.4°and 5.9°.Instead,the size and hierarchy of microstructure has been considered decisive in the satisfactory liquid repellent properties,smaller or rougher particle promotes better hydrophobicity.Seventeen types of particles were selected for the fabrication of diverse surfaces,Surprisingly,no matter what kind of particles was incorporated,the as-prepared surfaces show remarkably water-repellent ability.Versatile micro or nano-scale particles with specific functions were carried out in the experiment,attaining the superhydrophobic surfaces with conductivity,fluorescence,pH-sensitivity,magnetic responsiveness,luminescence,and integrated property.The current finding does not only unlock more possibilities of fabricating superhydrophobic substrates,but also build an efficient bridge between nano-materials and superwettability systems.(2)Subsequently,this method of preparation can be used to explore the difference between superhydrophobic on water and Superaerophilicity underwater,and discuss the final experimental results.versatile gas/solid interacting phenomena were reported by utilizing different superhydrophobic substrates,indicating that these two wetting states cannot be simply equated.The superhydrophobic surface with hydrophilic defects,from underwater to dense when underwater,the gas running time is 230 ms,420 ms and can not be transported.In contrast,the time for water droplets to roll on the surface in the air is 295 ms,255 ms,and 250 ms.Hydrophilic defects have a great influence on underwater gas transportation,but droplets in the air do not.Results show that the different media pressures applied on the two wetting states determine the diversified fluid-delivering phenomena;Through the rational incorporation of hydrophilic defects,a series of gas-transporting behaviors are achieved purposively,for example,gas film delivery,bubble transporting,and anisotropic bubble gating,which proves the feasibility of this underwater air-controlling strategy.(3)During the research,it was found that some super-hydrophobic coatings have high adhesion like rose petals.So we designed an experiment to regulate adhesion.Finally,the adhesion of the prepared surface was adjusted by changing the mixing ratio of glass fiber and 5 ?m silica.By changing the mass fraction of glass fibers,high adhesion surfaces can adhere to 1 ?m,2 ?m,3 ?m,and 4 ?m droplets,respectively.