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Impact-induced solidlike behavior and elasticity in concentrated colloidal suspensions
1Department of Materials Science and Engineering, CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China, Hefei 230026, Anhui Province, China.
Physical Review. E
|January 20, 2018
Summary
Concentrated suspensions of SiO2 in ethylene glycol exhibit surprising solid-like behavior when impacted. This study reveals that hydrodynamic and solvation forces explain the impact-induced solidification and elasticity, aiding understanding of stress-induced phenomena.
Area of Science:
- Materials Science
- Fluid Dynamics
- Colloid Science
Background:
- Concentrated suspensions can exhibit complex behaviors under stress.
- Understanding impact-induced transitions is crucial for material design and safety.
Purpose of the Study:
- To investigate the impact response of SiO2-ethylene glycol concentrated suspensions.
- To elucidate the mechanisms behind impact-induced solidification and elasticity.
Main Methods:
- Modified drop weight impact tests were conducted.
- Analysis focused on impactor deceleration and rebound dynamics.
Main Results:
- Observed counterintuitive solid-like behavior and elasticity upon impact.
- Deceleration force primarily attributed to hydrodynamic interactions.
- Elasticity explained by short-range repulsive forces from particle solvation layers.
Conclusions:
- Hydrodynamic and solvation forces are key to understanding impact-induced solidification in these suspensions.
- Provides experimental evidence for stress-induced transitions in concentrated colloids.
- Contributes to the fundamental understanding of non-Newtonian fluid behavior under impact.
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