Dilatant flow of concentrated suspensions of rough particles

The flow anisotropy of a concentrated colloidal suspension at the jamming transition is studied. It is shown that the use of rough spherical particles reduces the hydrodynamic lubrication forces between adjacent colloids and makes possible the study of the stress tensor anisotropy. At low shear rate...

Full description

Saved in:
Bibliographic Details
Published in:Physical review letters 2005-12, Vol.95 (26), p.268302.1-268302.4, Article 268302
Main Authors: LOOTENS, Didier, VAN DAMME, Henri, HEMAR, Yacine, HEBRAUD, Pascal
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Colloids - chemistry
Computer Simulation
Exact sciences and technology
General and physical chemistry
Microfluidics - methods
Microspheres
Models, Chemical
Motion
Particle Size
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Shear Strength
Stress, Mechanical
Surface Properties
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The flow anisotropy of a concentrated colloidal suspension at the jamming transition is studied. It is shown that the use of rough spherical particles reduces the hydrodynamic lubrication forces between adjacent colloids and makes possible the study of the stress tensor anisotropy. At low shear rates, the suspension exerts an attractive force between two opposite surfaces, whereas at higher shear rates it becomes dilatant. Direct confocal microscopy observation of the particles organization reveal that crystallites form at high shear rate.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.95.268302