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  • 标题:Brownian fluctuations and hydrodynamics of a microhelix near a solid wall
  • 本地全文:下载
  • 作者:Silvio Bianchi ; Viridiana Carmona Sosa ; Gaszton Vizsnyiczai
  • 期刊名称:Scientific Reports
  • 电子版ISSN:2045-2322
  • 出版年度:2020
  • 卷号:10
  • 期号:1
  • 页码:1-8
  • DOI:10.1038/s41598-020-61451-y
  • 出版社:Springer Nature
  • 摘要: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.
  • 关键词:Colloids
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