Spontaneous jumping, bouncing and trampolining of hydrogel drops on a heated plate.
Spontaneous jumping, bouncing and trampolining of hydrogel drops on a heated plate.
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DOI：
10.1038/s41467-017-01010-8
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发表时间：
2017-10-13
影响因子：
16.6
通讯作者：
Vollmer D
中科院分区：
文献类型：
--
作者：
Pham JT;Paven M;Wooh S;Kajiya T;Butt HJ;Vollmer D
液滴与热固体表面之间的接触对于工业过程（例如热喷涂和喷雾冷却）具有实际重要性。固体球体的接触和弹跳也是球磨、粉末加工和日常活动（如球类运动）中遇到的重要事件。使用高速视频显微镜，我们证明了水凝胶滴，最初在表面上休息，自发地跳快速加热后，并继续反弹，增加振幅。跳跃受表面润湿性、表面温度、水凝胶弹性和粘附力控制。低附着力冲击性能和快速水蒸气形成的组合支持连续弹跳和蹦床运动。我们的研究结果说明了水凝胶的固体和液体特性之间的相互作用如何导致有趣的动力学，如自发跳跃，弹跳，蹦床和极短的接触时间所反映的。热表面上的液滴可以表现出迷人的行为，例如莱顿弗罗斯特效应，液滴在蒸汽层上盘旋。在这里，Pham等人表明，当水凝胶滴被放置在快速加热的板上时，即使它们最初处于静止状态，它们也会反弹到越来越高的高度。
The contact between liquid drops and hot solid surfaces is of practical importance for industrial processes, such as thermal spraying and spray cooling. The contact and bouncing of solid spheres is also an important event encountered in ball milling, powder processing, and everyday activities, such as ball sports. Using high speed video microscopy, we demonstrate that hydrogel drops, initially at rest on a surface, spontaneously jump upon rapid heating and continue to bounce with increasing amplitudes. Jumping is governed by the surface wettability, surface temperature, hydrogel elasticity, and adhesion. A combination of low-adhesion impact behavior and fast water vapor formation supports continuous bouncing and trampolining. Our results illustrate how the interplay between solid and liquid characteristics of hydrogels results in intriguing dynamics, as reflected by spontaneous jumping, bouncing, trampolining, and extremely short contact times. Drops of liquid on a hot surface can exhibit fascinating behaviour such as the Leidenfrost effect in which drops hover on a vapour layer. Here Pham et al. show that when hydrogel drops are placed on a rapidly heated plate they bounce to increasing heights even if they were initially at rest.
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DOI：
10.1016/0017-9310(66)90112-8
发表时间：
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影响因子：
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