Remotely powered distributed microfluidic pumps and mixers based on miniature diodes.
We demonstrate new principles of microfluidic pumping and mixing by electronic components integrated into a microfluidic chip. The miniature diodes embedded into the microchannel walls rectify the voltage induced between their electrodes from an external alternating electric field. The resulting electroosmotic flows, developed in the vicinity of the diode surfaces, were utilized for pumping or mixing of the fluid in the microfluidic channel. The flow velocity of liquid pumped by the diodes facing in the same direction linearly increased with the magnitude of the applied voltage and the pumping direction could be controlled by the pH of the solutions. The transverse flow driven by the localized electroosmotic flux between diodes oriented oppositely on the microchannel was used in microfluidic mixers. The experimental results were interpreted by numerical simulations of the electrohydrodynamic flows. The techniques may be used in novel actively controlled microfluidic-electronic chips.
Chang
Suk Tai
ST
Department of Chemical & Biomolecular Engineering, North Carolina State University, 911 Partners Way, Raleigh, USA.
Beaumont
Erin
E
Petsev
Dimiter N
DN
Velev
Orlin D
OD
D005453:Fluorescence; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008839:Microelectrodes; D044085:Microfluidics / Q000295:instrumentation* / Q000379:methods; D012666:Semiconductors