Change in the Electric Current Required to Sustain Steady Electroosmotic Flow in a Capillary
Change in the Electric Current Required to Sustain Steady Electroosmotic Flow in a Capillary
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DOI：
10.1143/jjap.39.236
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发表时间：
2000-01
影响因子：
1.5
通讯作者：
T. Osuga;S. Kitagawa;H. Sakamoto;T. Tsuda
中科院分区：
文献类型：
--
作者：
T. Osuga;S. Kitagawa;H. Sakamoto;T. Tsuda
对于毛细管中的电渗流，当注入和排出溶液之间存在电导率差时，基于维持电渗流所需的电流的变化，建立了一种定位注入和排出溶液之间的前沿区的方法。当在填充有溶液的毛细管的两端之间施加一定电压时，在毛细管中产生微扰，其流动轮廓是平坦的，与Poiffille流动的流动轮廓相反。虽然双曲波以恒定速度移动锋区，但发现在恒定电压下维持双曲波所需的监测电流根据时间的双曲线函数而变化。通过将注入和喷出的溶液与串联的两个电阻相关联，给出了电流变化的准确描述，而锋区通过毛细管前进。
For electroosmotic flow (EOF) in a capillary, a method is established to locate the frontal zone between the injected and ejected solutions, based on the change in the electric current required to sustain the EOF when there is a difference of electric conductivity between the injected and ejected solutions. When a certain voltage is applied between the two ends of a capillary filled with a solution, the EOF is generated in the capillary, the flow profile of which is flat, in contrast to that of the Poiseuille flow. Although the EOF moves the frontal zone with constant velocity, the monitored electric current required to sustain the EOF under a constant voltage is found to change according to a hyperbolic function of time. By associating the injected and ejected solutions with two resistances connected in series, an accurate account is given of the change in the electric current while the frontal zone progresses through the capillary.