Investigation of the yielding transition in concentrated colloidal systems via rheo-XPCS

We probe the microstructural yielding dynamics of a concentrated colloidal system by performing creep/recovery tests with simultaneous collection of coherent scattering data via X-ray Photon Correlation Spectroscopy (XPCS). This combination of rheology and scattering allows for time-resolved observa...

Full description

Saved in:
Bibliographic Details
Published inProceedings of the National Academy of Sciences - PNAS Vol. 120; no. 18; p. e2215517120
Main Authors Donley, Gavin J, Narayanan, Suresh, Wade, Matthew A, Park, Jun Dong, Leheny, Robert L, Harden, James L, Rogers, Simon A
Format Journal Article
LanguageEnglish
Published United States National Academy of Sciences 02.05.2023
Proceedings of the National Academy of Sciences
Subjects
Coherent scattering
Colloids
Data recovery
Dynamics
Photon correlation spectroscopy
Physical Sciences
Rheological properties
Rheology
Shearing
Spectroscopy
Stresses
time-resolved rheology
X-ray photon correlation spectroscopy
yielding
soft glass
structure–property relations
Online AccessGet full text

Cover

More Information
Summary:We probe the microstructural yielding dynamics of a concentrated colloidal system by performing creep/recovery tests with simultaneous collection of coherent scattering data via X-ray Photon Correlation Spectroscopy (XPCS). This combination of rheology and scattering allows for time-resolved observations of the microstructural dynamics as yielding occurs, which can be linked back to the applied rheological deformation to form structure-property relations. Under sufficiently small applied creep stresses, examination of the correlation in the flow direction reveals that the scattering response recorrelates with its predeformed state, indicating nearly complete microstructural recovery, and the dynamics of the system under these conditions slows considerably. Conversely, larger creep stresses increase the speed of the dynamics under both applied creep and recovery. The data show a strong connection between the microstructural dynamics and the acquisition of unrecoverable strain. By comparing this relationship to that predicted from homogeneous, affine shearing, we find that the yielding transition in concentrated colloidal systems is highly heterogeneous on the microstructural level.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
NA0003525
USDOE
Edited by David Weitz, Harvard University, Cambridge, MA; received September 9, 2022; accepted February 4, 2023
ISSN:0027-8424
1091-6490
1091-6490
DOI:10.1073/pnas.2215517120