To roll or not to roll(?) is the yield stress (in soft particulate gels)
Fuente:
arXiv
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866913777586274304 |
|---|---|
| author | More, Rishabh Mckinley, Gareth |
| author_facet | More, Rishabh Mckinley, Gareth |
| contents | While it is widely acknowledged that system-spanning particulate structures contribute to the observed yield stress and shear-thinning in attractive colloidal gels, a comprehensive understanding of the underlying microscopic mechanisms remains elusive. In this study, we present findings from coarse-grained simulations focusing on model depletion gels to shed light on this intriguing phenomenon. Contrary to conventional belief, our simulations reveal that the mere presence of attractive interactions and aggregate formation does not sufficiently explain the observed yield stress. Instead, we identify a crucial physics element in the form of microscopic constraints on the relative rotational motion between bonded particles. Through a detailed analysis of microstructure and particle dynamics, we elucidate how these constraints lead to the emergence of yield stress in soft particulate gels. This research provides essential insights into the micromechanical origins of yield stress in soft particulate gels, paving the way for improved understanding and engineering of these versatile materials for various real-world applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_03672 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | To roll or not to roll(?) is the yield stress (in soft particulate gels) More, Rishabh Mckinley, Gareth Soft Condensed Matter While it is widely acknowledged that system-spanning particulate structures contribute to the observed yield stress and shear-thinning in attractive colloidal gels, a comprehensive understanding of the underlying microscopic mechanisms remains elusive. In this study, we present findings from coarse-grained simulations focusing on model depletion gels to shed light on this intriguing phenomenon. Contrary to conventional belief, our simulations reveal that the mere presence of attractive interactions and aggregate formation does not sufficiently explain the observed yield stress. Instead, we identify a crucial physics element in the form of microscopic constraints on the relative rotational motion between bonded particles. Through a detailed analysis of microstructure and particle dynamics, we elucidate how these constraints lead to the emergence of yield stress in soft particulate gels. This research provides essential insights into the micromechanical origins of yield stress in soft particulate gels, paving the way for improved understanding and engineering of these versatile materials for various real-world applications. |
| title | To roll or not to roll(?) is the yield stress (in soft particulate gels) |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2504.03672 |