Contact-Angle Hysteresis and Contact-Line Friction on Slippery Liquid-like Surfaces.
Contact-Angle Hysteresis and Contact-Line Friction on Slippery Liquid-like Surfaces.
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DOI：
10.1021/acs.langmuir.0c02668
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发表时间：
2020-12-15
期刊：
影响因子：
--
通讯作者：
Ledesma-Aguilar R
中科院分区：
文献类型：
--
作者：
Barrio-Zhang H;Ruiz-Gutiérrez É;Armstrong S;McHale G;Wells GG;Ledesma-Aguilar R
接触线钉扎和动摩擦力是阻碍液滴在固体表面上运动的基本力。日常经验表明，如果固体表面提供低接触线钉扎，则其也将赋予移动液滴相对低的动摩擦。这样的表面的实例是超疏水的、光滑的多孔液体注入的和润滑剂浸渍的表面。然而，在这里，我们表明，光滑的全憎共价连接的液体状（SOCAL）表面具有显着的组合的接触角滞后和接触线摩擦性能，这导致非常低的液滴钉扎，但对液滴的运动高的动态摩擦。我们目前的实验水滴的体积变化在受控的温度和湿度条件下，我们分别比较的预测的流体动力学模型和接触线模型的基础上分子动力学理论的响应。我们的研究结果表明，SOCAL表面提供非常低的接触角滞后，在1和3°之间，但意外的高动态摩擦控制的接触线，其中典型的弛豫时间尺度是秒的数量级，4个数量级大于经典流体动力学模型的预测。我们的研究结果突出了显着的润湿性SOCAL表面和它们的潜在应用低钉扎，缓慢液滴脱落表面。
Contact-line pinning and dynamic friction are fundamental forces that oppose the motion of droplets on solid surfaces. Everyday experience suggests that if a solid surface offers low contact-line pinning, it will also impart a relatively low dynamic friction to a moving droplet. Examples of such surfaces are superhydrophobic, slippery porous liquid-infused, and lubricant-impregnated surfaces. Here, however, we show that slippery omniphobic covalently attached liquid-like (SOCAL) surfaces have a remarkable combination of contact-angle hysteresis and contact-line friction properties, which lead to very low droplet pinning but high dynamic friction against the motion of droplets. We present experiments of the response of water droplets to changes in volume at controlled temperature and humidity conditions, which we separately compare to the predictions of a hydrodynamic model and a contact-line model based on molecular kinetic theory. Our results show that SOCAL surfaces offer very low contact-angle hysteresis, between 1 and 3°, but an unexpectedly high dynamic friction controlled by the contact line, where the typical relaxation time scale is on the order of seconds, 4 orders of magnitude larger than the prediction of the classical hydrodynamic model. Our results highlight the remarkable wettability of SOCAL surfaces and their potential application as low-pinning, slow droplet shedding surfaces.
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