Reversible self-propelled droplet movement: A new driving mechanism
Reversible self-propelled droplet movement: A new driving mechanism
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DOI：
10.1103/physrevlett.95.136103
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发表时间：
2005-09-23
影响因子：
8.6
通讯作者：
Riegler, H
中科院分区：
文献类型：
--
作者：
Lazar, P;Riegler, H
提出并分析了长链烷烃液滴的可逆自推进运动。在略高于本体熔化温度时，固体烷烃多层熔化成液滴，液滴以自避免的随机路径移动。在移动时，液滴消耗固体烷烃并留下加宽的凹槽。在略低于本体熔化的温度下，该过程可以逆转。现在，水滴向后移动，留下一条狭窄的固体痕迹，这是由收缩的水滴滋养的。定量分析了熔滴的运动速度，指出熔滴的熔化焓是熔滴运动的能量来源。
Reversible self-propelled movements of droplets of long chain alkanes are presented and analyzed. Slightly above the bulk melting temperature, solid alkane multilayers melt into droplets which move in a self-avoiding, random path. While moving, the droplets consume the solid alkane and leave behind a widening groove. At temperatures slightly below bulk melting this process can be reversed. Now the droplets move backwards leaving behind a narrowing solid trail which is nourished by the shrinking droplet. The speeds of the droplets are analyzed quantitatively and the melting enthalpy is identified as energetic source for their movement.