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Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions
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An Alternating Current Electroosmotic Pump Based on Conical Nanopore Membranes
Xiaojian Wu1, Pradeep Ramiah Rajasekaran1, Charles R Martin1
1Department of Chemistry, University of Florida , Gainesville, Florida 32611-7200, United States.
ACS Nano
|April 6, 2016
Summary
This study introduces a novel electroosmotic flow (EOF) pump using membrane rectification. This AC-powered device offers potential advantages over traditional DC-mode pumps for microfluidic applications.
Area of Science:
- Electrokinetics
- Microfluidics
- Membrane science
Background:
- Electroosmotic flow (EOF) is crucial for fluid transport in microfluidic devices and capillary electrophoresis.
- Conventional EOF pumps often rely on direct current (DC) modes.
Purpose of the Study:
- To describe a new EOF pump design utilizing membrane EOF rectification.
- To investigate the performance of this AC-powered EOF pump.
Main Methods:
- Utilized polymeric membranes with asymmetrically shaped (conical) pores.
- Applied symmetrical sinusoidal voltage waveforms across the membrane.
- Investigated the effects of voltage magnitude and frequency on flow rate and measured maximum operating pressure.
Main Results:
- Demonstrated solution flow through the membrane via AC-driven EOF rectification.
- Showcased that rectified AC currents through asymmetric pores generate directed flow.
- Characterized the influence of voltage parameters on flow rate and pump pressure.
Conclusions:
- AC-powered membrane EOF rectification provides a viable method for pumping solutions in microfluidic systems.
- This approach presents potential advantages over conventional DC-mode EOF pumps.
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