Cargando…

Brownian fluctuations and hydrodynamics of a microhelix near a solid wall

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...

Descripción completa

Detalles Bibliográficos
Autores principales: Bianchi, Silvio, Carmona Sosa, Viridiana, Vizsnyiczai, Gaszton, Di Leonardo, Roberto
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7067800/
https://www.ncbi.nlm.nih.gov/pubmed/32165686
http://dx.doi.org/10.1038/s41598-020-61451-y
_version_ 1783505457310072832
author Bianchi, Silvio
Carmona Sosa, Viridiana
Vizsnyiczai, Gaszton
Di Leonardo, Roberto
author_facet Bianchi, Silvio
Carmona Sosa, Viridiana
Vizsnyiczai, Gaszton
Di Leonardo, Roberto
author_sort Bianchi, Silvio
collection PubMed
description 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.
format Online
Article
Text
id pubmed-7067800
institution National Center for Biotechnology Information
language English
publishDate 2020
publisher Nature Publishing Group UK
record_format MEDLINE/PubMed
spelling pubmed-70678002020-03-19 Brownian fluctuations and hydrodynamics of a microhelix near a solid wall Bianchi, Silvio Carmona Sosa, Viridiana Vizsnyiczai, Gaszton Di Leonardo, Roberto Sci Rep Article 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. Nature Publishing Group UK 2020-03-12 /pmc/articles/PMC7067800/ /pubmed/32165686 http://dx.doi.org/10.1038/s41598-020-61451-y Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Bianchi, Silvio
Carmona Sosa, Viridiana
Vizsnyiczai, Gaszton
Di Leonardo, Roberto
Brownian fluctuations and hydrodynamics of a microhelix near a solid wall
title Brownian fluctuations and hydrodynamics of a microhelix near a solid wall
title_full Brownian fluctuations and hydrodynamics of a microhelix near a solid wall
title_fullStr Brownian fluctuations and hydrodynamics of a microhelix near a solid wall
title_full_unstemmed Brownian fluctuations and hydrodynamics of a microhelix near a solid wall
title_short Brownian fluctuations and hydrodynamics of a microhelix near a solid wall
title_sort brownian fluctuations and hydrodynamics of a microhelix near a solid wall
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7067800/
https://www.ncbi.nlm.nih.gov/pubmed/32165686
http://dx.doi.org/10.1038/s41598-020-61451-y
work_keys_str_mv AT bianchisilvio brownianfluctuationsandhydrodynamicsofamicrohelixnearasolidwall
AT carmonasosaviridiana brownianfluctuationsandhydrodynamicsofamicrohelixnearasolidwall
AT vizsnyiczaigaszton brownianfluctuationsandhydrodynamicsofamicrohelixnearasolidwall
AT dileonardoroberto brownianfluctuationsandhydrodynamicsofamicrohelixnearasolidwall