Novel Self-Periodic Motion due to Induced Charge Electrokinetic Phenomena in Porous Materials

A nonlinear oscillator has attracted much attention as a representative nonequilibrium dynamics. We here report a novel self-periodic motion in a porous material. That is, by using a nonlinear electrokinetic phenomenon in the porous material, we demonstrate that porous material in water performs sel...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2021-12, Vol.90 (12), p.1
Main Authors: Sugioka, Hideyuki, Hanazawa, Yuya, Ishikawa, Masato
Format: Article
Language:English
Subjects:
Actuators
Broken symmetry
Drug delivery systems
Electric fields
Electrokinetics
Microfluidic devices
Oscillators
Porous materials
Space charge
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Summary:A nonlinear oscillator has attracted much attention as a representative nonequilibrium dynamics. We here report a novel self-periodic motion in a porous material. That is, by using a nonlinear electrokinetic phenomenon in the porous material, we demonstrate that porous material in water performs self-periodic motion between electrodes in the presence of an alternating electric field. Moreover, by proposing a simple phenomenological model that considers a self-propelled motion due to a spontaneous breaking symmetry of the surrounding space charge due to the motion itself in an induced charge electrokinetic phenomenon, we succeed in explaining the new self-periodic motion of the porous material qualitatively. We believe that our findings provide new insight into nonlinear oscillators and new microfluidic devices such as drug delivery systems, actuators, microfluidic self-swimmers, etc.
ISSN:0031-9015
1347-4073
DOI:10.7566/JPSJ.90.124402