Relating rheotaxis and hydrodynamic actuation using asymmetric gold-platinum phoretic rods

Quentin Brosseau, Florencio Balboa Usabiaga, Enkeleida Lushi, Yang Wu, Leif Ristroph, Jun Zhang, Michael Ward, Michael J. Shelley

Research output: Contribution to journalArticle

Abstract

We explore the behavior of micron-scale autophoretic Janus (Au/Pt) rods, having various Au/Pt length ratios, swimming near a wall in an imposed background flow. We find that their ability to robustly orient and move upstream, i.e., to rheotax, depends strongly on the Au/Pt ratio, which is easily tunable in synthesis. Numerical simulations of swimming rods actuated by a surface slip show a similar rheotactic tunability when varying the location of the surface slip versus surface drag. The slip location determines whether swimmers are pushers (rear actuated), pullers (front actuated), or in between. Our simulations and modeling show that pullers rheotax most robustly due to their larger tilt angle to the wall, which makes them responsive to flow gradients. Thus, rheotactic response infers the nature of difficult to measure flow fields of an active particle, establishes its dependence on swimmer type, and shows how Janus rods can be tuned for flow responsiveness.

Original languageEnglish (US)
Article number178004
JournalPhysical Review Letters
Volume123
Issue number17
DOIs
StatePublished - Oct 25 2019

Fingerprint

actuation
Janus
platinum
slip
rods
hydrodynamics
gold
upstream
drag
flow distribution
simulation
gradients
synthesis

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Relating rheotaxis and hydrodynamic actuation using asymmetric gold-platinum phoretic rods. / Brosseau, Quentin; Usabiaga, Florencio Balboa; Lushi, Enkeleida; Wu, Yang; Ristroph, Leif; Zhang, Jun; Ward, Michael; Shelley, Michael J.

In: Physical Review Letters, Vol. 123, No. 17, 178004, 25.10.2019.

Research output: Contribution to journalArticle

Brosseau, Quentin ; Usabiaga, Florencio Balboa ; Lushi, Enkeleida ; Wu, Yang ; Ristroph, Leif ; Zhang, Jun ; Ward, Michael ; Shelley, Michael J. / Relating rheotaxis and hydrodynamic actuation using asymmetric gold-platinum phoretic rods. In: Physical Review Letters. 2019 ; Vol. 123, No. 17.
@article{3a75ecbcd6ca4bba8115adfb3b80e15f,
title = "Relating rheotaxis and hydrodynamic actuation using asymmetric gold-platinum phoretic rods",
abstract = "We explore the behavior of micron-scale autophoretic Janus (Au/Pt) rods, having various Au/Pt length ratios, swimming near a wall in an imposed background flow. We find that their ability to robustly orient and move upstream, i.e., to rheotax, depends strongly on the Au/Pt ratio, which is easily tunable in synthesis. Numerical simulations of swimming rods actuated by a surface slip show a similar rheotactic tunability when varying the location of the surface slip versus surface drag. The slip location determines whether swimmers are pushers (rear actuated), pullers (front actuated), or in between. Our simulations and modeling show that pullers rheotax most robustly due to their larger tilt angle to the wall, which makes them responsive to flow gradients. Thus, rheotactic response infers the nature of difficult to measure flow fields of an active particle, establishes its dependence on swimmer type, and shows how Janus rods can be tuned for flow responsiveness.",
author = "Quentin Brosseau and Usabiaga, {Florencio Balboa} and Enkeleida Lushi and Yang Wu and Leif Ristroph and Jun Zhang and Michael Ward and Shelley, {Michael J.}",
year = "2019",
month = "10",
day = "25",
doi = "10.1103/PhysRevLett.123.178004",
language = "English (US)",
volume = "123",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "17",

}

TY - JOUR

T1 - Relating rheotaxis and hydrodynamic actuation using asymmetric gold-platinum phoretic rods

AU - Brosseau, Quentin

AU - Usabiaga, Florencio Balboa

AU - Lushi, Enkeleida

AU - Wu, Yang

AU - Ristroph, Leif

AU - Zhang, Jun

AU - Ward, Michael

AU - Shelley, Michael J.

PY - 2019/10/25

Y1 - 2019/10/25

N2 - We explore the behavior of micron-scale autophoretic Janus (Au/Pt) rods, having various Au/Pt length ratios, swimming near a wall in an imposed background flow. We find that their ability to robustly orient and move upstream, i.e., to rheotax, depends strongly on the Au/Pt ratio, which is easily tunable in synthesis. Numerical simulations of swimming rods actuated by a surface slip show a similar rheotactic tunability when varying the location of the surface slip versus surface drag. The slip location determines whether swimmers are pushers (rear actuated), pullers (front actuated), or in between. Our simulations and modeling show that pullers rheotax most robustly due to their larger tilt angle to the wall, which makes them responsive to flow gradients. Thus, rheotactic response infers the nature of difficult to measure flow fields of an active particle, establishes its dependence on swimmer type, and shows how Janus rods can be tuned for flow responsiveness.

AB - We explore the behavior of micron-scale autophoretic Janus (Au/Pt) rods, having various Au/Pt length ratios, swimming near a wall in an imposed background flow. We find that their ability to robustly orient and move upstream, i.e., to rheotax, depends strongly on the Au/Pt ratio, which is easily tunable in synthesis. Numerical simulations of swimming rods actuated by a surface slip show a similar rheotactic tunability when varying the location of the surface slip versus surface drag. The slip location determines whether swimmers are pushers (rear actuated), pullers (front actuated), or in between. Our simulations and modeling show that pullers rheotax most robustly due to their larger tilt angle to the wall, which makes them responsive to flow gradients. Thus, rheotactic response infers the nature of difficult to measure flow fields of an active particle, establishes its dependence on swimmer type, and shows how Janus rods can be tuned for flow responsiveness.

UR - http://www.scopus.com/inward/record.url?scp=85074455594&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85074455594&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.123.178004

DO - 10.1103/PhysRevLett.123.178004

M3 - Article

C2 - 31702241

AN - SCOPUS:85074455594

VL - 123

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 17

M1 - 178004

ER -