Paper Number
AT8 

Session
Advanced Techniques and Methods

Title
Flow elasticity of driven colloidal suspensions

Presentation Date and Time
February 15, 2017 (Wednesday) 4:50

Track / Room
Track 4 / Sandhill Crane

Authors (Click on name to view author profile)

1. Wang, Zhe (Oak Ridge National Laboratory)
2. Porcar, Lionel (Institut Laue-Langevin, Large Scale Structures)
3. Wang, Yangyang (Oak Ridge National Laboratory)
4. Sanchez-Diaz, Luis E. (Oak Ridge National Laboratory)
5. Lam, Christopher N. (Oak Ridge National Laboratory)
6. Liu, Yun (National Institute of Standards and Technology)
7. Iwashita, Takuya (Oita University)
8. Egami, Takeshi (Oak Ridge National Laboratory)
9. Chen, Wei-Ren (Oak Ridge National Laboratory)

Author and Affiliation Lines (in printed abstract book)
Zhe Wang¹, Lionel Porcar², Yangyang Wang¹, Luis E. Sanchez-Diaz¹, Christopher N. Lam¹, Yun Liu³, Takuya Iwashita⁴, Takeshi Egami¹, and Wei-Ren Chen^1
1Oak Ridge National Laboratory, Oak Ridge, TN 37831; ²Large Scale Structures, Institut Laue-Langevin, Grenoble, France; ³National Institute of Standards and Technology, Gaithersburg, MD 20899; ⁴Oita University, Oita, Japan

Speaker / Presenter 
Chen, Wei-Ren

Text of Abstract
The development of mode-coupling theory (MCT) for addressing the deformation behavior of non-Newtonian liquids is relatively new. While the existing approximation can predict certain fundamental rheological behaviors that are characteristic of hard-sphere suspensions, there remains some ambiguity as to whether or not this theoretical framework can be extended to address the rheological properties of strongly interacting colloidal suspensions, which are commonly found in nature and a wide variety of applications. Using neutron scattering and rheological measurement, we demonstrate the flow behavior of charge-stabilized colloidal suspensions is a consequence of localized elastic response generated by particle interaction. We show how this short-lived, localized mechanical coherency determines the rheological behaviors, transport properties and glass phenomenon of driven colloids. Our finding sheds new light on understanding the nature of nonlinear colloidal rheology and provides a new theoretical ingredient for the development of first-principle constitutive equations for soft matter systems.