锥形纳米孔内的电压整流及流体流动

文章以生物纳米通道及纳米孔中的离子传输及化学反应为背景，以离子流整流、电渗流整流、离子积累耗散模型为理论基础，使用有限元数值计算方法研究压力及电场交互作用下的锥形纳米孔孔内离子浓度分布及速度场分布现象.分析了不同电压下压力和电场的交互作用对锥形纳米孔中速度场、流场及浓度分布的影响.结果表明纳米孔孔内氢离子运动方向主要受电场方向影响.由于静电吸附效应，沿着孔壁流动的电渗流中的氢离子浓度会高于体溶液中的氢离子浓度.当电压较小时，流场方向主要受压力流的影响，当电压较大时，流场流动方向由电渗流带动的流体流动和压力驱动的流体流动共同决定. 

Voltage Rectified and Fluid Flow in Conical Nanopores

This study used ion transport and chemical reaction in biological nanopore and nanochannel as the background, with ion current rectification and ion accumulation and depletion model as the model basis. The ion distribution and velocity field in nanochannel under pressure and electric field interaction were studied by using finite element method. By changing the magnitude of the electric field, the effect of the interaction between the pressure and the electric field on the velocity field, flow field and ion distribution in the conical nanopore was observed. Results show that hydrogen ion movement direction is mainly influenced by electric field direction. Due to electrostatic adsorption effect, hydrogen ion concentration near the layer is higher than the bulk hydrogen ion concentration. When the voltage is low, the direction of the flow field is mainly affected by the pressure flow. When the voltage is high, the flow direction of the flow field is determined by the electroosmotic flow and pressure-driven flow.