Emergence of multiscale dynamics in colloidal gels
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PhysRevLett.124.088005.pdf
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744.79 KB
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Author(s)
Cho, Jae Hyung
Cerbino, Roberto
Bischofberger, Irmgard
Date Issued
February 2020
Journal
Physical review letters
Publisher
American Physical Society
Citation
Cho, Jae Hyung, Roberto Cerbino, and Irmgard Bischofberger, "Emergence of multiscale dynamics in colloidal gels." Physical review letters 124 (2020): no. 088005 doi 10.1103/PhysRevLett.124.088005 ©2020 Author(s)
Version
Final published version
Abstract
To gain insight into the kinetics of colloidal gel evolution at low particle volume fractions ϕ, we utilize differential dynamic microscopy to investigate particle aggregation, geometric percolation, and the subsequent transition to nonergodic dynamics. We report the emergence of unexpectedly rich multiscale dynamics upon the onset of nonergodicity, which separates the wave vectors q into three different regimes. In the high-q domain, the gel exhibits ϕ-independent internal vibrations of fractal clusters. The intermediate-q domain is dominated by density fluctuations at the length scale of the clusters, as evidenced by the q independence of the relaxation time τ. In the low-q domain, the scaling of τ as q^{-3} suggests that the network appears homogeneous. The transitions between these three regimes introduce two characteristic length scales, distinct from the cluster size. ©2020
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.124.088005
