Sustaining redox-magnetohydrodynamics (R-MHD) microfluidics by switching oppositely-polarized permanent magnets: Synchronized activation and automation
Sustaining redox-magnetohydrodynamics (R-MHD) microfluidics by switching oppositely-polarized permanent magnets: Synchronized activation and automation
复制标题
通过切换相反极化的永磁体来维持氧化还原磁流体动力学 (R-MHD) 微流体:同步激活和自动化
DOI:
10.1016/j.snb.2021.130415
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Fritsch, Ingrid
中科院分区:
文献类型:
--
作者:
Khan, Foysal Z.;Abrego Tello, Miguel;Parette, David N.;Fritsch, Ingrid
A transformative advance in redox-magnetohydrodynamics (R-MHD) microfluidics is demonstrated that indefinitely extends its pumping duration with a miniaturizable approach, while preserving its uniqueness as an internal, self-contained, on-device, active and versatile pump that can also propel fluid in a loop. R-MHD can address the need for fine-tuning microfluidics in micro total analysis systems (μTAS) for multiple functions in an automated fashion that conventional external pumps with channels and/or valves that determine direction cannot fulfill. In MHD, a body force produced by the cross product of ionic current between strategically-activated electrodes and magnetic flux from a permanent magnet or electromagnet drives the fluid. Conducting-polymer-modified electrodes (e.g. with poly(3,4-ethylenedioxythiophene), PEDOT), involve faradaic processes to convert electronic current in the external circuit to ionic current in solution, overcoming bubble generation and electrode corrosion that limited previous MHD microfluidic applications. PEDOT-R-MHD pumping operates with a wider variety of solution compositions and without redox additives. However, pumping stops after complete oxidation/reduction of redox sites in the PEDOT films. The new advance reverses current between PEDOT-modified electrodes to discharge/recharge the polymer while simultaneously swapping permanent magnets of opposite polarities to sustain a constant, unidirectional pumping speed interrupted with brief pauses and without inductive heating. Factors affecting fluid velocities are described, including positions across the magnet assembly, current magnitudes and synchrony with current reversal. A model system (microbeads in biologically-compatible phosphate-buffered saline) is used, which can be generalized more broadly to biological and environmental applications, where starting, stopping, and indefinitely sustaining pumping of a sample are important.
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影响因子:
8.4
作者:
Weston, Melissa C.;Fritsch, Ingrid
通讯作者:
Fritsch, Ingrid
影响因子:
7.4
作者:
Nash, Christena K.;Fritsch, Ingrid
通讯作者:
Fritsch, Ingrid
DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
Christena K. Nash
通讯作者:
Christena K. Nash
影响因子:
7.4
作者:
V. Sahore;I. Fritsch
通讯作者:
I. Fritsch
影响因子:
7.4
作者:
Gao, Feng;Kreidermacher, Adam;Fritsch, Ingrid;Heyes, Colin D.
通讯作者:
Heyes, Colin D.