Premium
Induction of Electromotive Force by an Autonomously Moving Magnetic Bot
Author(s) -
Sailapu Sunil Kumar,
Chattopadhyay Arun
Publication year - 2014
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201309029
Subject(s) - electromotive force , signal (programming language) , faraday cage , buoyancy , particle (ecology) , magnet , materials science , magnetic nanoparticles , nanotechnology , physics , electrical engineering , nanoparticle , magnetic field , mechanics , computer science , engineering , oceanography , quantum mechanics , geology , programming language
We report the observation of the induction of electromotive force (emf) into a Faraday coil by an autonomously moving composite magnetic particle in aqueous medium. The particle consisted of a micron‐sized polymer sphere, which was decorated with catalytic Pd nanoparticles (NPs) and attached to a micron‐scale (N‐42 grade) rare‐earth magnet. The Pd NPs catalytically decomposed H 2 O 2 to generate O 2 , resulting in buoyancy‐driven vertical motion of the particle, while the micromagnet induced emf during the flight. Because a small volume of ethanol was layered on top of the liquid, the bubble burst when the particle ascended to the top and thus nearly continuous vertical motion was achieved. Spikes of alternating electrical signal could be observed up to 20 times per minute. The signal was sufficiently strong to illuminate light‐emitting diodes following appropriate amplification. This distinctive approach is expected to pave the way to developing synthetic bots which are autonomously propelled, generating their own signal for running complex circuitry.