Two modes of cluster dynamics govern the viscoelasticity of colloidal gels
Name
PhysRevE.103.032609.pdf
Description
Published version
Size
6.7 MB
Format
Unknown
Checksum (MD5)
636e40ded0d9340a0b60cd36aa043a4c
Author(s)
Cho, Jae Hyung
Bischofberger, Irmgard
Date Issued
2021
Journal
Physical Review E
Publisher
American Physical Society (APS)
Citation
Cho, Jae Hyung and Bischofberger, Irmgard. 2021. "Two modes of cluster dynamics govern the viscoelasticity of colloidal gels." Physical Review E, 103 (3).
Version
Final published version
Abstract
Colloidal gels formed by strongly attractive particles at low particle volume fractions are composed of space-spanning networks of uniformly sized clusters. We study the thermal fluctuations of the clusters using differential dynamic microscopy by decomposing them into two modes of dynamics, and link them to the macroscopic viscoelasticity via rheometry. The first mode, dominant at early times, represents the localized, elastic fluctuations of individual clusters. The second mode, pronounced at late times, reflects the collective, viscoelastic dynamics facilitated by the connectivity of the clusters. By mixing two types of particles of distinct attraction strengths in different proportions, we control the transition time at which the collective mode starts to dominate, and hence tune the frequency dependence of the linear viscoelastic moduli of the binary gels.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PHYSREVE.103.032609
