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- Title
Remotely powered self-propelling particles and micropumps based on miniature diodes.
- Authors
Suk Tai Chang; Paunov, Vesselin N.; Petsev, Dimiter N.; Velev, Orlin D.
- Abstract
Microsensors and micromachines that are capable of self-propulsion through fluids could revolutionize many aspects of technology. Few principles to propel such devices and supply them with energy are known. Here, we show that various types of miniature semiconductor diodes floating in water act as self-propelling particles when powered by an external alternating electric field. The millimetre-sized diodes rectify the voltage induced between their electrodes. The resulting particle-localized electro-osmotic flow propels them in the direction of either the cathode or the anode, depending on their surface charge. These rudimentary self-propelling devices can emit light or respond to light and could be controlled by internal logic. Diodes embedded in the walls of microfluidic channels provide locally distributed pumping or mixing functions powered by a global external field. The combined application of a.c. and d.c. fields in such devices allows decoupling of the velocity of the particles and the liquid and could be used for on-chip separations.
- Subjects
DIODES; PARTICLES; ELECTRIC fields; SEMICONDUCTORS; MICROELECTROMECHANICAL systems
- Publication
Nature Materials, 2007, Vol 6, Issue 3, p235
- ISSN
1476-1122
- Publication type
Article
- DOI
10.1038/nmat1843