CAS Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.; Key Laboratory of Colloid and Interface Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.; College of Sciences, Henan Agricultural University, Zhengzhou, Henan 450001, China.
CAS Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
Sci Adv. 2017 Mar 1;3(3):e1602188. doi: 10.1126/sciadv.1602188. eCollection 2017 Mar.
Deposition of liquid droplets on solid surfaces is of great importance to many fundamental scientific principles and technological applications, such as spraying, coating, and printing. For example, during the process of pesticide spraying, more than 50% of agrochemicals are lost because of the undesired bouncing and splashing behaviors on hydrophobic or superhydrophobic leaves. We show that this kind of splashing on superhydrophobic surfaces can be greatly inhibited by adding a small amount of a vesicular surfactant, Aerosol OT. Rather than reducing splashing by increasing the viscosity via polymer additives, the vesicular surfactant confines the motion of liquid with the help of wettability transition and thus inhibits the splash. Significantly, the vesicular surfactant exhibits a distinguished ability to alter the surface wettability during the first inertial spreading stage of ~2 ms because of its dense aggregates at the air/water interface. A comprehensive model proposed by this idea could help in understanding the complex interfacial interactions at the solid/liquid/air interface.
液滴在固体表面上的沉积对于许多基础科学原理和技术应用都非常重要，例如喷雾、涂层和印刷。例如，在农药喷洒过程中，由于疏水或超疏水叶片上的不期望的反弹和飞溅行为，超过 50%的农用化学品会损失。我们表明，通过添加少量的囊泡表面活性剂 Aerosol OT，可以大大抑制超疏水表面上的这种飞溅。与通过聚合物添加剂增加粘度来减少飞溅不同，囊泡表面活性剂借助润湿性转变来限制液体的运动，从而抑制了飞溅。重要的是，由于囊泡表面活性剂在空气/水界面处具有密集的聚集物，因此它在最初的惯性扩展阶段（约 2 毫秒）中具有改变表面润湿性的显著能力。这一想法提出的综合模型可以帮助理解固/液/气界面处的复杂界面相互作用。
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