AC-driven electro-osmotic pump and ratchet membrane by nanobeads and track-etched membrane

我们发现，在直流电压作用下，用磁控溅射法制备的400 nm孔径的聚碳酸酯蚀刻膜在表面镀上金，成为优异的电泳泵。如果对涂有金的轨道蚀刻膜施加交变电压，则交变水流被整流，膜作为交变电压驱动的直流电渗透泵。认为膜两侧zeta电位的差异产生了整流特性。此外，我们还利用超高分子量聚合物间隔剂将纳米球固定在棘轮膜的一侧，制备了棘轮膜。这些结果有望应用于不引起pH值变化的一次性电渗透泵和通过电解水产生气体。

We found that track etched membrane made of poly carbonate with pores of 400 nm coated with gold using magnetron spattering become excellent electrophoresis pomp under applying DC voltage. If an alternating voltage is imposed to the track etched membrane coated with gold in water, alternating flowof water was rectified and the membrane acted as alternating voltage driven DC electro osmotic pomp. It is considered that difference of zeta potentials on the both side of the membrane generated rectification property. Furthermore, we prepared ratchet membrane by fixing nanobeads on one side using ultrahigh molecular weight polymer spacers. These results are expected to be applied to disposable electro-osmotic pump that does not cause pH changes and the generation of gases by electrolysis of water.