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Brownian fluctuations and hydrodynamics of a microhelix near a solid wall

Bianchi, Silvio and Sosa, Viridiana Carmona and Vizsnyiczai, Gaszton and Di Leonardo, Roberto (2020) Brownian fluctuations and hydrodynamics of a microhelix near a solid wall. SCIENTIFIC REPORTS, 10 (1). ISSN 2045-2322

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Abstract

We combine two-photon lithography and optical tweezers to investigate the Brownian fluctuations and propeller characteristics of a microfabricated helix. From the analysis of mean squared displacements and time correlation functions we recover the components of the full mobility tensor. We find that Brownian motion displays correlations between angular and translational fluctuations from which we can directly measure the hydrodynamic coupling coefficient that is responsible for thrust generation. By varying the distance of the microhelices from a no-slip boundary we can systematically measure the effects of a nearby wall on the resistance matrix. Our results indicate that a rotated helix moves faster when a nearby no-slip boundary is present, providing a quantitative insight on thrust enhancement in confined geometries for both synthetic and biological microswimmers.

Item Type: Article
Uncontrolled Keywords: MOTION; Torque; Propulsion; SWIMMING EFFICIENCY;
Subjects: Q Science / természettudomány > QH Natural history / természetrajz > QH301 Biology / biológia > QH3020 Biophysics / biofizika
SWORD Depositor: MTMT SWORD
Depositing User: MTMT SWORD
Date Deposited: 26 Nov 2020 13:58
Last Modified: 26 Nov 2020 13:58
URI: http://real.mtak.hu/id/eprint/117491

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