Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session M24: Microscale Flows: Phoretic Effects
8:00 AM–10:10 AM,
Tuesday, November 20, 2018
Georgia World Congress Center
Room: B312
Chair: Federico Toschi, Eindhoven University of Technology
Abstract ID: BAPS.2018.DFD.M24.5
Abstract: M24.00005 : Diffusiophoresis in a Weakly Viscoelastic Fluid*
8:52 AM–9:05 AM
Presenter:
Shabab Saad
(Department of Chemical & Petroleum Engineering, University of Calgary)
Authors:
Shabab Saad
(Department of Chemical & Petroleum Engineering, University of Calgary)
Giovanniantonio Natale
(Department of Chemical & Petroleum Engineering, University of Calgary)
Self-propelling active colloids (AC) provide insights in the behavior of non-equilibrium systems by producing enhanced diffusive motion. Our model system consists of synthetic Janus (Pt/Si) microspheres undergoing diffusiophoresis (via local concentration gradient) in presence of H2O2. In this study, we aim to address for the first time the single-particle dynamics in a weakly viscoelastic fluid. Experimentally, Janus particles were dispersed in dilute PVP water solutions. The solution presented Newtonian shear viscosity with a finite but relatively short (~3ms) relaxation time. The Deborah number, based on the motion of the particles, was calculated to be in the order of 10-4. Within this regime, we attempt to investigate the coupling between the solute concentration field and the phoretic particle's motility (MSD, velocity and diffusivity analyzed via MPT) because of the weak viscoelastic medium. These findings are the foundations to understand collective motion of ACs in complex media and to study the interplay between particle organization [1] and fuel concentration in the limit of low Péclet number. Since any biological fluid is a viscoelastic fluid, the characterization of swimming dynamics is of high relevance for potential drug delivery applications.
*NSERC,CMC Microsys
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.M24.5
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700