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Ionic liquid flow along the carbon nanotube with DC electric field.

Abstract：

:Liquid pumping can occur along the outer surface of an electrode under a DC electric field. For biological applications, a better understanding of the ionic solution pumping mechanism is required. Here, we fabricated CNT wire electrodes (CWEs) and tungsten wire electrodes (TWEs) of various diameters to assess an ionic solution pumping. A DC electric field created by a bias of several volts pumped the ionic solution in the direction of the negatively biased electrode. The resulting electro-osmotic flow was attributed to the movement of an electric double layer near the electrode, and the flow rates along the CWEs were on the order of picoliters per minute. According to electric field analysis, the z-directional electric field around the meniscus of the small electrode was more concentrated than that of the larger electrode. Thus, the pumping effect increased as the electrode diameter decreased. Interestingly in CWEs, the initiating voltage for liquid pumping did not change with increasing diameter, up to 20 μm. We classified into three pumping zones, according to the initiating voltage and faradaic reaction. Liquid pumping using the CWEs could provide a new method for biological studies with adoptable flow rates and a larger 'Recommended pumping zone'.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Shin JH,Kim GH,Kim I,Jeon H,An T,Lim G

doi

10.1038/srep11799

subject

Has Abstract

pub_date

2015-07-02 00:00:00

pages

11799

issn

2045-2322

pii

srep11799

journal_volume

5

pub_type

杂志文章

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