Switching Rotational Dynamics Types in a Microrod System Using Tunable Hodographs
Sofia A. Korsakova 1, Nikita P. Kryuchkov 1, Egor V. Yakovlev 1, Daniil A. Bystrov 1, Fabian Hagemans 2, Ivan V. Simkin 1, Jerome J. Crassous 2, Stanislav O. Yurchenko 1
1 Bauman Moscow State Technical University, 2nd Baumanskaya street 5, Moscow, 105005, Russia;
2 Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, Aachen, 52074, Germany
Abstract
To confirm the hypothesis, experiments were conducted using silica microrods dispersed in deionized water.
Polarization of the microparticles was provided by an electric field generated using an 8-electrode system. Electric field strength vector rotated within the system’s plane along an elliptical hodograph at a frequency of 30 kHz. Optical video microscopy was used to observe the dynamics in the microparticle system and record experimental data. The experimental data were processed using Fiji software.
We demonstrate that by controlling the parameters of the external rotating electric field, three types of rotational dynamics of microrods were achieved: asynchronous continuous rotation, oscillations around a certain direction with sporadic rod flips, and a regime of “arrested” particle orientation along the principal axes of field anisotropy.
The results of the work should be interesting for application in microfluidic technologies, e.g., for mixing of fluids in microscales, as well as for the creation of large ordered 2D array that could find applications for the creation of photonic and biomaterials.
The study was supported by the Russian Science Foundation, Grant No. 20-72-10161.
Speaker
Sofia A. Korsakova
Bauman Moscow State Technical University, 2nd Baumanskaya street 5, Moscow, 105005, Russia
Russia
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