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Strain heterogeneity in sheared colloids revealed by neutron scattering
1Centre for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA. wangy@ornl.gov.
Physical Chemistry Chemical Physics : PCCP
|February 14, 2018
Summary
This study reveals how colloidal suspensions deform under shear. At high shear rates, particle rearrangements become plastic, differing from low shear rate behavior.
Area of Science:
- Colloid and Surface Science
- Materials Science
- Rheology
Background:
- Colloidal suspensions exhibit heterogeneous particle-level deformation under shear.
- This heterogeneity critically influences macroscopic behavior in industrial applications.
- Experimental studies on non-equilibrium colloidal structure heterogeneity are limited.
Purpose of the Study:
- To experimentally investigate the heterogeneity of colloidal suspensions under steady shear.
- To understand the transition in deformation behavior with varying shear rates.
- To provide the first small-angle neutron scattering insights into this phenomenon.
Main Methods:
- Utilized small-angle neutron scattering (SANS) as the primary experimental technique.
- Applied steady shear to colloidal suspension samples.
- Analyzed the evolution of strain heterogeneity as a function of shear rate.
Main Results:
- Observed significant heterogeneity in particle-level deformation.
- Demonstrated a transition in deformation mechanisms with increasing shear rate.
- Identified nearly affine deformation at low shear rates.
Conclusions:
- Shear-induced deformation in colloidal suspensions is highly heterogeneous.
- A transition from affine to plastic rearrangement behavior occurs at high shear rates.
- SANS is a valuable tool for probing non-equilibrium colloidal structures.
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