Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session N16: Disordered and Glassy Systems (Non-polymeric)
11:30 AM–2:30 PM,
Wednesday, March 8, 2023
Room: Room 208
Sponsoring
Unit:
DSOFT
Chair: Peter Morse, Duke University
Abstract: N16.00014 : Visualizing failure in arrested hard and sticky spheres*
2:06 PM–2:18 PM
Presenter:
Paddy Royall
(ESPCI Paris)
Author:
Paddy Royall
(ESPCI Paris)
Among the key developments in analysing colloidal systems is to resolve the particle coordinates in 3D [3], allowing a level of analysis usually only possible in computer simulation. However in amorphous materials, relating mechanical properties to microscopic structure remains problematic. This makes it rather hard to understand, for example, mechanical failure. Here we introduce a new colloidal model system to address this challenge by studying the contacts and the forces between particles, as well as their positions. To do so, we use an emulsion in which the interparticle forces and local stress can be linked to the microscopic structure. We demonstrate the potential of our method to reveal insights into the failure mechanisms of soft amorphous solids by determining local stress two examples: firstly, a colloidal gel, which collapses under its own weight and secondly a colloidal glass under shear stress. In particular, we identify “force chains” of load–bearing droplets, and local stress anisotropy, and investigate their connection with locally rigid packings of the droplets [4].
*Engineering and Physical Sciences Research Council (UK).
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