Convection caused by three-phase boundary reactions
Convection caused by three-phase boundary reactions
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DOI：
10.1016/j.jelechem.2006.07.019
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发表时间：
2006-10-01
影响因子：
4.5
通讯作者：
Nishiumi, Toyuhiko
中科院分区：
文献类型：
--
作者：
Aoki, Koichi;Satoh, Masanori;Nishiumi, Toyuhiko
当将包含二茂铁（Fc）的硝基苯液滴放置在浸入水溶液中的电极上时，Fc在硝基苯垂直棒水垂直棒电极界面处的电化学氧化引起对流，该对流从电极上的半球形硝基苯液滴的顶部流向硝基苯和水相的三相边界。通过用视频显微镜追踪分散的碳粉末来确定流速。对流归因于流动的两个不对称性：扩散物质（Fc）向三相边界对硝基苯的拖曳力，而没有任何产物（Fc（+））的反扩散，以及油垂直棒电极边界和油垂直棒水边界附近的摩擦力差异。对流扩散方程与与油相中 Fc 扩散力相关的 Navier-Stokes 方程相结合。在一维流模型的假设下，对组合方程进行半定量求解。该解解释了流速的潜在依赖性。 (c) 2006 Elsevier B.V. 保留所有权利。
When a ferrocene (Fc)-included nitrobenzene droplet was set on an electrode immersed in an aqueous solution, the electrochemical oxidation of Fc at the interface of nitrobenzene vertical bar water vertical bar electrode gave rise to the convection, which flowed from the top of the hemispherical nitrobenzene droplet on the electrode to the three-phase boundary both in the nitrobenzene and aqueous phases. The flow velocity was determined by tracing the dispersed carbon powders with a video microscope. The convection was ascribed to two asymmetries of the flow: the dragging force on nitrobenzene by the diffusing species (Fc) toward the three-phase boundary without any counter diffusion of the product (Fc(+)), and the difference in the frictional force near the oil vertical bar electrode boundary and the oil vertical bar water boundary. The convective diffusion equation was combined with Navier-Stokes' equation associated with the diffusion force of Fc in the oil phase. The combined equations were solved semi-quantitatively on the assumptions of the one-dimensional stream model. The solution explained the potential dependence of the flow velocity. (c) 2006 Elsevier B.V. All rights reserved.