Metallic Microswimmers Driven up the Wall by Gravity

Autor:	Brosseau, Quentin, Usabiaga, Florencio Balboa, Lushi, Enkeleida, Wu, Yang, Ristroph, Leif, Ward, Michael D., Shelley, Michael J., Zhang, Jun
Rok vydání:	2020
Předmět:	Condensed Matter - Soft Condensed Matter Physics - Fluid Dynamics
Druh dokumentu:	Working Paper
Popis:	As a natural and functional behavior, various microorganisms exhibit gravitaxis by orienting and swimming upwards against gravity. Swimming autophoretic nanomotors described herein, comprising bimetallic nanorods, preferentially orient upwards and swim up along a wall, when tail-heavy (i.e. when the density of one of the metals is larger than the other). Through experiment and theory, two mechanisms were identified that contribute to this gravitactic behavior. First, a buoyancy or gravitational torque acts on these rods to align them upwards. Second, hydrodynamic interactions of the rod with the inclined wall induce a fore-aft drag asymmetry on the rods that reinforces their orientation bias and promotes their upward motion. Comment: 12 pages, 11 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2008.05273 Zobrazit plný text záznamu View this record from Arxiv