A high current density DC magnetohydrodynamic (MHD) micropump

Homsy, Alexandra and Koster, Sander and Eijkel, Jan C.T. and Berg van den, Albert and Lucklum, F. and Verpoorte, E. and Rooij de, Nico F. (2005) A high current density DC magnetohydrodynamic (MHD) micropump. Lab on a Chip, 5 (4). pp. 466-471. ISSN 1473-0197

PDF
Restricted to UT campus only: Request a copy
446Kb

Abstract:	This paper describes the working principle of a DC magnetohydrodynamic (MHD) micropump that can be operated at high DC current densities (J) in 75-µm-deep microfluidic channels without introducing gas bubbles into the pumping channel. The main design feature for current generation is a micromachined frit-like structure that connects the pumping channel to side reservoirs, where platinum electrodes are located. Current densities up to 4000 A m–2 could be obtained without noticeable Joule heating in the system. The pump performance was studied as a function of current density and magnetic field intensity, as well as buffer ionic strength and pH. Bead velocities of up to 1 mm s–1(0.5 µL min–1) were observed in buffered solutions using a 0.4 T NdFeB permanent magnet, at an applied current density of 4000 A m–2. This pump is intended for transport of electrolyte solutions having a relatively high ionic strength (0.5–1 M) in a DC magnetic field environment. The application of this pump for the study of biological samples in a miniaturized total analysis system (µTAS) with integrated NMR detection is foreseen. In the 7 T NMR environment, a minimum 16-fold increase in volumetric flow rate for a given applied current density is expected.
Item Type:	Article
Copyright:	© 2005 Royal Society of Chemistry
Faculty:	Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:	Biomedical and Environmental Sensor systems (BIOS)
Link to this item:	http://purl.utwente.nl/publications/51073
Official URL:	http://dx.doi.org/10.1039/b417892k
Export this item as:	BibTeX EndNote HTML Citation Reference Manager

Show download statistics for this publication

Repository Staff Only: item control page

Metis ID: 224036