Relationship between rheology and structure of interpenetrating, deforming and compressing microgels
- Conley, Gaurasundar M. Department of Physics, University of Fribourg, Switzerland
- Zhang, Chi Department of Physics, University of Fribourg, Switzerland
- Aebischer, Philippe Department of Physics, University of Fribourg, Switzerland
- Harden, James L. Department of Physics, University of Ottawa, Ottawa, Ontario, Canada
- Scheffold, Frank Department of Physics, University of Fribourg, Switzerland
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04.06.2019
Published in:
- Nature Communications. - 2019, vol. 10, no. 1, p. 2436
English
Thermosensitive microgels are widely studied hybrid systems combining properties of polymers and colloidal particles in a unique way. Due to their complex morphology, their interactions and packing, and consequentially the viscoelasticity of suspensions made from microgels, are still not fully understood, in particular under dense packing conditions. Here we study the frequency-dependent linear viscoelastic properties of dense suspensions of micron sized soft particles in conjunction with an analysis of the local particle structure and morphology based on superresolution microscopy. By identifying the dominating mechanisms that control the elastic and dissipative response, we can explain the rheology of these widely studied soft particle assemblies from the onset of elasticity deep into the overpacked regime. Interestingly, our results suggest that the friction between the microgels is reduced due to lubrification mediated by the polymer brush-like corona before the onset of interpenetration.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Physique
- Language
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- English
- Classification
- Physics
- License
- License undefined
- Identifiers
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- RERO DOC 326792
- DOI 10.1038/s41467-019-10181-5
- Persistent URL
- https://folia.unifr.ch/unifr/documents/308047
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