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首页> 外文期刊>Advanced Functional Materials >Motion of Drops with Different Viscosities on Micro-Nanotextured Surfaces of Varying Topography and Wetting Properties
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Motion of Drops with Different Viscosities on Micro-Nanotextured Surfaces of Varying Topography and Wetting Properties

机译：微观形貌和润湿性不同的微纳米纹理表面上不同粘度的液滴运动

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摘要

Superhydrophobic surfaces are extensively investigated in the literature, yet the phenomenon of drop motion on such surfaces and the corresponding friction properties of surfaces with different topography are not sufficiently analyzed. Here, drop motion on hydrophobic and superhydrophobic surfaces with different size topography is investigated for drops of largely varying viscosity (i.e., water and glycerol). The threshold force required to initiate drop movement is probed, the drop motion (velocity and acceleration) is analyzed, and the friction force on each surface is calculated. It is evident that as roughness increases, the threshold force to initiate 20 mu L drop motion decreases; the lowest value for water is 17.9 +/- 4.0 mu N. For glycerol, the lowest threshold force value is 22.3 +/- 5.9 mu N. The results also indicate that this threshold force required for the initiation of the drop motion seems to be higher than that when the drop starts moving. Finally, this force (being proportional to the contact line) is expected to be about half smaller for 5 mu L droplets. Water drops obtain higher velocities and accelerations by an order of magnitude compared to glycerol drops, which is attributed to the combinational effect of the higher hysteresis and the larger contact line of glycerol drops.
机译：在文献中对超疏水表面进行了广泛的研究，但是尚未充分分析这种表面上的滴落运动现象以及具有不同形貌的表面的相应摩擦特性。在此，针对粘度变化很大的液滴（即水和甘油），研究了具有不同尺寸形貌的疏水和超疏水表面上的液滴运动。探查开始下落运动所需的阈值力，分析下落运动（速度和加速度），并计算每个表面上的摩擦力。显然，随着粗糙度的增加，启动20μL跌落运动的阈值力减小；水的最小值为17.9 +/- 4.0μN。甘油的最低阈值力为22.3 +/- 5.9μN。结果还表明，开始下落运动所需的阈值力似乎是高于水滴开始移动时的水平。最后，对于5μL的液滴，该力（与接触线成比例）预计会减小一半左右。与甘油滴相比，水滴获得更高的速度和加速度一个数量级，这归因于较高的滞后性和较大的甘油滴接触线的组合作用。

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