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 M37: Suspensions: Rheology
8:00 AM–10:10 AM,
Tuesday, November 20, 2018
Georgia World Congress Center
Room: B409
Chair: Harishankar Manikantan, UCSB
Abstract ID: BAPS.2018.DFD.M37.9
Abstract: M37.00009 : Manipulating the sedimentation of Kaolinite clay suspensions through charge interactions*
9:44 AM–9:57 AM
Presenter:
Sebastien Kosgodagan Acharige
(Univ of Pennsylvania)
Authors:
Sebastien Kosgodagan Acharige
(Univ of Pennsylvania)
Ali Seiphoori
(Univ of Pennsylvania)
Douglas J Jerolmack
(Univ of Pennsylvania)
Paulo E. Arratia
(Univ of Pennsylvania)
Clay minerals are present in many natural (landslides, river channels) and industrial processes (ceramics, cosmetics, oil recovery). They are plate shaped charged colloids and exhibit different rheological properties than suspended hard-sphere colloids, e.g. thixotropy and shear-banding. Kaolinite clay platelets are easily found in nature and when suspended in liquids, they possess non-zero yield stress at low concentrations, indicating that the particles structure themselves through attractive interactions. Here, sedimentation of kaolinite suspensions in water are performed as a model system for geophysical flows. Using salts (NaCl and (NaPO3)6) to manipulate particle interactions from attractive to repulsive, we manipulate the sedimentation behavior from hard-sphere to gel-like behavior. Rheological experiments show that the repulsive kaolinite suspensions are Newtonian, while introduction of attraction leads to non-Newtonian behavior and flow hysteresis. Knowing that phosphate and chloride salts are common in nature, these observations provide insights for geophysical flows, like particulate gravity currents or the erosion threshold for cohesive river banks.
*Research was sponsored by the Army Research Laboratory under Grant Number W911-NF-16-1-0290
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.M37.9
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