Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 25, Issue 34, Pages 5512-5519Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201502129
Keywords
active particles; alternating (AC) electrohydrodynamics; duty cycle modulation; microswimmers; remote steering; self-propelling diodes
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Funding
- US National Science Foundation through the Research Triangle NSF MRSEC on Programmable Soft Matter [DMR-1121107]
- NSF [CBET-0828900]
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The principles and design of active self-propelling particles that can convert energy, move directionally on their own, and perform a certain function is an emerging multidisciplinary research field, with high potential for future technologies. A simple and effective technique is presented for on-demand steering of self-propelling microdiodes that move electroosmotically on water surface, while supplied with energy by an external alternating (AC) field. It is demonstrated how one can control remotely the direction of diode locomotion by electronically modifying the applied AC signal. The swimming diodes change their direction of motion when a wave asymmetry (equivalent to a DC offset) is introduced into the signal. The data analysis shows that the ability to control and reverse the direction of motion is a result of the electrostatic torque between the asymmetrically polarized diodes and the ionic charges redistributed in the vessel. This novel principle of electrical signal-coded steering of active functional devices, such as diodes and microcircuits, can find applications in motile sensors, MEMs, and microrobotics.
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