| Issue |
EPL
Volume 90, Number 6, June 2010
|
|
|---|---|---|
| Article Number | 66001 | |
| Number of page(s) | 6 | |
| Section | Condensed Matter: Structural, Mechanical and Thermal Properties | |
| DOI | https://doi.org/10.1209/0295-5075/90/66001 | |
| Published online | 08 July 2010 | |
Tunable dynamic fragility and elasticity in dense suspensions of many-arm-star polymer colloids
Department of Materials Science and Frederick Seitz Materials Research Laboratory, University of Illinois 1304 West Green Street, Urbana, IL 61801, USA
Corresponding author: kschweiz@illinois.edu
Received:
9
March
2010
Accepted:
8
June
2010
A microscopic theoretical study of glassy dynamics in dense fluids of soft many-arm-star polymers is performed which elucidates the connection between local packing, shear elasticity and activated relaxation. A soft-jamming crossover is identified, below which particle-softness–dependent apparent power law concentration scaling of the shear modulus and supra-exponential relaxation occur. Dynamic fragility varies over a remarkably wide range, increasing logarithmically with star functionality. Beyond the soft-jamming threshold, the shear modulus increases linearly with volume fraction.
PACS: 64.70.pv – Colloids / 64.70.Q- – Theory and modeling of the glass transition
© EPLA, 2010
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