Experimental evidence of the motion of a single out-of-equilibrium drop.
Experimental evidence of the motion of a single out-of-equilibrium drop.
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单个非平衡液滴运动的实验证据。
DOI：
10.1021/la700826z
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
V. Tricoli
中科院分区：
文献类型：
--
作者：
D. Molin;R. Mauri;V. Tricoli
我们的实验表明，当一个单一的，中性浮力滴注入到一个二元混合物中，它保持静止或移动，这取决于是否组成的下降和周围相符合的平衡浓度。一般来说，非平衡液滴的运动（称为扩散电泳）是由Korteweg体力引起的。这个力与化学势梯度成正比，因此只有当系统处于化学不平衡时才不为零。在这封信中，我们通过实验表明，即使初始条件是（几乎）各向同性的，这种运动也会发生在单个液滴上。这种不稳定性，虽然它没有一个完整的分析解释，已经预测在数值模拟由Vladimirova等人（Vladimirova，N; Malagoli，A.;毛里河E 1999，60，2037）。
We show experimentally that when a single, neutrally buoyant drop is injected into a binary mixture either it remains quiescent or it moves, depending on whether the composition of the drop and that of the surrounding phase coincide with the equilibrium concentrations. In general, the movement of out-of-equilibrium drops, which is called diffusiophoresis, is induced by the Korteweg body force. This force is proportional to the chemical potential gradient and is therefore nonzero only when the system is in chemical nonequilibrium. In this letter, we show experimentally that this movement occurs for a single drop as well, even when the initial condition is (almost) isotropic. This instability, although it does not have a complete analytical explanation, has been predicted in the numerical simulations by Vladimirova et al. (Vladimirova, N.; Malagoli, A.; Mauri, R. Phys. Rev. E 1999, 60, 2037).