A ferrofluidic magnetic micropump

By Anson Hatch, A. Kamholz, G. Holman, Paul Yager, K. Böhringer. 2001

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Ferrofluid-based microchip pump and valve (2004, background): “Hatch et al. [21] described the use of ferrofluids Fig.”
Micro-magnetofluidics: interactions between magnetism and fluid flow on the microscale (2011, methodology): “2011); b annular pump with two ferrofluid plugs (Hatch et al. 2001); c annular pump with one ferrofluid plug (Sun et al.”
A PMMA valveless micropump using electromagnetic actuation (2005, background): “Hatch et al. (2001) and Yamahata et al. (2004) reported a micropump based on the pumping and valving action of a ferrofluidic plug in a microfluidic channel.”
Plastic micropump with ferrofluidic actuation (2005, methodology): “Ferrofluid-based valves have generated magnetic pressures of 130 mbar [23], using a hydrocarbon-based ferrofluid with high magnetization, while a pressure of 12 mbar for a typical pumping rate of 50 was reported in [ 24 ].”