Electrothermal ac electro-osmosis

被引：27

作者：

Gagnon, Zachary R. ^{[1
]}

Chang, Hsueh-Chia ^{[1
]}

机构：

[1] Univ Notre Dame, Dept Chem & Biomol Engn, Ctr Microfluid & Med Diagnost, Notre Dame, IN 46556 USA

来源：

APPLIED PHYSICS LETTERS | 2009年 / 94卷 / 02期

关键词：

electrochemical electrodes; electrokinetic effects; electrophoresis; osmosis;

D O I：

10.1063/1.3020720

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Two ac polarization mechanisms, charge accumulation due to electrode double layer charging and bulk permittivity/conductivity gradients generated by Joule heating, are combined in the double layer by introducing zwitterions to produce a new ac electrokinetic pump with the largest velocity (>1 mm/s) and flow penetration depth (100 mu m) reported for low-conductivity fluids. The large fluid velocity is due to a quartic scaling with respect to voltage, as is true of electrothermal flow, but exhibits a clear maximum at a frequency corresponding to the electrode double layer inverse RC time.

引用

页数：3

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