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

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
 [1];  [2]; ORCiD logo [3];  [4]; ORCiD logo [5];  [6]; ORCiD logo [3]
  1. Univ. of Illinois at Urbana-Champaign, IL (United States); Georgetown Univ., Washington, DC (United States); National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  2. Argonne National Laboratory (ANL), Argonne, IL (United States)
  3. Univ. of Illinois at Urbana-Champaign, IL (United States)
  4. Sookmyung Women’s University, Seoul (Korea, Republic of)
  5. Johns Hopkins Univ., Baltimore, MD (United States)
  6. Univ. of Ottawa, ON (Canada)

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.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC02-06CH11357; NA0003525
OSTI ID:
1971275
Alternate ID(s):
OSTI ID: 2470254
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 120, Issue 18; ISSN 0027-8424
Publisher:
National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
English

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