Vapour-driven Marangoni propulsion: continuous, prolonged and tunable motion
Vapour-driven Marangoni propulsion: continuous, prolonged and tunable motion
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DOI：
10.1039/c2sc20355c
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发表时间：
2012-01-01
期刊：
影响因子：
8.4
通讯作者：
Ras, Robin H. A.
中科院分区：
文献类型：
--
作者：
Jin, Hua;Marmur, Abraham;Ras, Robin H. A.
我们展示了蒸汽驱动的Marangoni效应作为一种新的范例，通过将化学能转换为运动性来实现漂浮软机器的连续自推进，其特征在于使用少量的船上燃料以稳定的速度进行长时间的运动。推进是通过使用通过纳米纤维素气凝胶膜输送的有机蒸气对液体表面进行改性而引起的。稳定的速度是通过连续供应降低液体表面张力的燃料蒸汽，结合漂浮机器通过后表面张力的自发恢复来实现的。该膜从它们的开孔纳米纤维结构是透气的，并且由于它们的超疏水和超疏油性质而漂浮在水和油上。通过选择具有不同蒸气压的溶剂，可以调节速度。
We show the vapour-driven Marangoni effect as a new paradigm for the continuous self-propulsion of floating soft machines by transduction of chemical energy to motility, featuring a prolonged locomotion at steady velocity with a small amount of on-board fuel. The propulsion is induced by modification of the liquid surface using organic vapour transported through a nanocellulose aerogel membrane. The steady velocity is achieved through a continuous supply of fuel vapour that lowers the surface tension of the liquid, combined with the spontaneous recovery of the surface tension after the floating machine has passed. The membranes are gas permeable from their open-porous nanofibrillar structure and float on water and oils due to their superhydrophobic and superoleophobic nature. The velocity is tunable by selecting solvents with different vapour pressure.