Pumping of water with ac electric fields applied to asymmetric pairs of microelectrodes
Pumping of water with ac electric fields applied to asymmetric pairs of microelectrodes
复制标题
DOI：
10.1103/physreve.63.016305
复制
发表时间：
2001-01-01
影响因子：
2.4
通讯作者：
Rennie, AR
中科院分区：
文献类型：
--
作者：
Brown, ABD;Smith, CG;Rennie, AR
描述了由峰值电压低于水电离电势的交流电势引起的大量流体流动。通过成对排列的电极平面阵列将电势施加到离子溶液上，使得大电极的一个边缘靠近相对的窄电极。在半个周期期间，当电流在电极之间流动时，电极表面上的双层充电。电极以不均匀的方式充电，产生平行于电极表面的电势梯度。该梯度驱动双层中的离子穿过电极表面，进而拖动流体穿过电极表面。电极对的各向异性性质用于产生流体的净流动。所产生的流动在距电极的距离大于电极阵列的周期性处近似均匀。报告该行的电势和频率依赖性并与简单模型进行比较。这种产生流体流动的方法不同于电和热行波技术，因为仅需要低电压并且电极结构要简单得多。
Bulk fluid flow induced by an ac electric potential with a peak voltage below the ionization potential of water is described. The potential is applied to an ionic solution with a planar array of electrodes arranged in pairs so that one edge of a large electrode is close to an opposing narrow electrode. During half the cycle, the double layer on the surface of the electrodes charges as current flows between the electrodes. The electrodes charge in a nonuniform manner producing a gradient in potential parallel to the surface of the electrodes. This gradient drives the ions in the double layer across the surface of the electrode and this in turn drags the fluid across the electrode surface. The anisotropic nature of the pairs of electrodes is used to produce a net flow of fluid. The flow produced is approximately uniform at a distance from the electrodes that is greater than the periodicity of the electrode array. The potential and frequency dependence of this Row is reported and compared to a simple model. This method of producing fluid flow differs from electrical and thermal traveling-wave techniques as only a low voltage is required and the electrode construction is much simpler.