AC Electroosmotic Pumping in Nanofluidic Funnels.
AC Electroosmotic Pumping in Nanofluidic Funnels.
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DOI：
10.1021/acs.analchem.6b00839
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发表时间：
2016-06-21
影响因子：
7.4
通讯作者：
Jacobson, Stephen C.
中科院分区：
文献类型：
--
作者：
Kneller, Andrew R.;Haywood, Daniel G.;Jacobson, Stephen C.
We report efficient pumping of fluids through nanofluidic funnels when a symmetric AC waveform is applied. The asymmetric geometry of the nanofluidic funnel induces not only ion current rectification but also electroosmotic flow rectification. In the base-to-tip direction, the funnel exhibits a lower ion conductance and a higher electroosmotic flow velocity, whereas in the tip-to-base direction, the funnel has a higher ion conductance and a lower electroosmotic flow velocity. Consequently, symmetric AC waveforms easily pump fluid through the nanofunnels over a range of frequencies, e.g., 5 Hz to 5 kHz. In our experiments, the nanofunnels were milled into glass substrates with a focused ion beam (FIB) instrument, and the funnel design had a constant 5° taper with aspect ratios (funnel tip width to funnel depth) of 0.1 to 1.0. We tracked ion current rectification by current-voltage (I–V) response and electroosmotic flow rectification by transport of a zwitterionic fluorescent probe. Rectification of ion current and electroosmotic flow increased with increasing electric field applied to the nanofunnel. Our results support three-dimensional simulations of ion transport and electroosmotic transport through nanofunnels, which suggest the asymmetric electroosmotic transport stems from an induced pressure at the junction of the nanochannel and nanofunnel tip.
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影响因子：
7.4
作者：
Haywood, Daniel G.;Saha-Shah, Anumita;Baker, Lane A.;Jacobson, Stephen C.
通讯作者：
Jacobson, Stephen C.
影响因子：
7.4
作者：
Menard, Laurent D.;Ramsey, J. Michael
通讯作者：
Ramsey, J. Michael
影响因子：
3.7
作者：
Bishop, Gregory W.;Lopez, Marcos M., Jr.;Martin, Charles R.
通讯作者：
Martin, Charles R.
影响因子：
17.1
作者：
Perry, John M.;Zhou, Kaimeng;Jacobson, Stephen C.
通讯作者：
Jacobson, Stephen C.
影响因子：
7.4
作者：
Kovarik, Michelle L.;Jacobson, Stephen C.
通讯作者：
Jacobson, Stephen C.