Local elastic perturbation of colloidal suspensions near the colloidal glass transition
Abstract
Isolated microscopic magnetic particles are used to induce local perturbations in dense colloidal suspensions by rotating an external magnet. Confocal microscopy enables tracking of both the magnetic probe particle and adjacent colloidal particles. A probe particle moves with a circular trajectory. Knowing the external force and measuring the amplitude and phase of the probe motion allows us to infer the storage and loss moduli of colloidal suspensions at various volume fractions. These measurements are in qualitative agreement with previous results from conventional rheology. To further analyze the system's response, the oscillatory amplitude of colloidal particles is evaluated as a function of distance from the probe, revealing a 1/r decay in amplitude, consistent with a homogeneous viscoelastic material. These observations confirm that continuum descriptions of the colloidal samples are effective down to length scales comparable to the particle diameter.
Versions
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BibTeX
@misc{habdas2026local,
title = {{Local elastic perturbation of colloidal suspensions near the colloidal glass transition}},
author = {Piotr Habdas and Rachel E. Courtland and Eric R. Weeks},
howpublished = {arXiv},
year = {2026},
month = aug,
doi = {10.48550/arxiv.2605.04937},
eprint = {2605.04937},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2605.04937},
}
RIS
TY - UNPB
TI - Local elastic perturbation of colloidal suspensions near the colloidal glass transition
AU - Piotr Habdas
AU - Rachel E. Courtland
AU - Eric R. Weeks
PY - 2026
DA - 2026/08/05
PB - arXiv
DO - 10.48550/arxiv.2605.04937
UR - https://arxiv.org/abs/2605.04937
AB - Isolated microscopic magnetic particles are used to induce local perturbations in dense colloidal suspensions by rotating an external magnet. Confocal microscopy enables tracking of both the magnetic probe particle and adjacent colloidal particles. A probe particle moves with a circular trajectory. Knowing the external force and measuring the amplitude and phase of the probe motion allows us to infer the storage and loss moduli of colloidal suspensions at various volume fractions. These measurements are in qualitative agreement with previous results from conventional rheology. To further analyze the system's response, the oscillatory amplitude of colloidal particles is evaluated as a function of distance from the probe, revealing a 1/r decay in amplitude, consistent with a homogeneous viscoelastic material. These observations confirm that continuum descriptions of the colloidal samples are effective down to length scales comparable to the particle diameter.
ER -