Low-voltage electroosmotic pumping using porous anodic alumina membranes
Low-voltage electroosmotic pumping using porous anodic alumina membranes
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DOI：
10.1007/s10404-007-0242-8
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发表时间：
2008-08-01
影响因子：
2.8
通讯作者：
Wang, Chi-Chuan
中科院分区：
文献类型：
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作者：
Chen, Yu-Feng;Li, Ming-Chia;Wang, Chi-Chuan
本研究利用氧化铝奈米多孔膜，在相当低的电压下，实现单位面积高流量的电渗泵送。铂网电极垂直于纳米通道入口，并与纳米通道入口直接接触，以提供均匀的电场并减少储存器中的电压降。测得的流速与电解质（KCl）浓度揭示了两个不同的特点。第一，流速通常在低浓度（10（-5）至10（-7）M）时较高，其中出现最大值。第二，当浓度超过10（-4）M时，可以看到流速的显著下降。在20 V的工作电压下，该研究获得的最大流速为0.09 mL/min V cm（2），能量传递效率为0.43%。具有33线间距的网状电极能够提供均匀的电场，具有低电解质浓度的纳米多孔膜提供了双电层强烈重叠的环境，与薄氧化铝膜相关联，导致在相当低的施加电压（20-80 V）下的高流速。的流量是可比的现有的结果，而本研究的相应的操作电压是约一至两个订单低于大多数现有的结果。
This study demonstrated electroosmotic pumping with high flow rate per unit area at a rather low applied voltage by using alumina nano-porous membrane. The platinum mesh electrode is perpendicular to, and has direct contact with the nano-channel inlet for proving uniform electric field and for reducing the electric voltage drop in the reservoir. The measured flow rate versus electrolyte (KCl) concentration reveals two distinct characteristics. First, the flow rate is usually high at low concentrations (10(-5) to 10(-7) M) in which a maximum value occurs. Second, a remarkable drop of flow rate is seen when the concentration surpasses 10(-4) M. The maximum flow rate achieved from this study is 0.09 mL/min V cm(2) and the energy transfer efficiency is 0.43% at an operation voltage of 20 V. The mesh electrodes with 33 wire spacing are capable of providing an uniform electric field, the nano-porous membrane with a low electrolyte concentration provides the environment for strong overlapping of electric double layer, in association with the thin alumina membrane, leading to a high flow rate at a rather low applied voltage (20-80 V). The flow rate is comparable to the existing results whereas the corresponding operation voltage of this study is about one to two orders lower than most of the existing results.