کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
221089 | 463371 | 2006 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Convection caused by three-phase boundary reactions Convection caused by three-phase boundary reactions](/preview/png/221089.png)
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∣water∣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∣electrode boundary and the oil∣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.
Journal: Journal of Electroanalytical Chemistry - Volume 595, Issue 2, 1 October 2006, Pages 103–108