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New insights on carbon black suspension rheology—Anisotropic thixotropy and antithixotropy

Journal Article · · Journal of Rheology
DOI:https://doi.org/10.1122/8.0000455· OSTI ID:1982941
 [1];  [2]
  1. Department of Mechanical Science and Engineering, University of Illinois Urbana-Champaign, Urbana, Illinois 61801; Beckman Institute for Advanced Science and Technology, University of Illinois Urbana-Champaign, Urbana, Illinois 61801; Joint Center for Energy Storage Research, Argonne National Laboratory, Lemont, Illinois 60439
  2. Department of Mechanical Science and Engineering, University of Illinois Urbana-Champaign, Urbana, Illinois 61801; Beckman Institute for Advanced Science and Technology, University of Illinois Urbana-Champaign, Urbana, Illinois 61801; Joint Center for Energy Storage Research, Argonne National Laboratory, Lemont, Illinois 60439; Materials Research Laboratory, University of Illinois Urbana-Champaign, Urbana, Illinois 61801

We report a detailed experimental study of peculiar thixotropic dynamics of carbon black (CB, Vulcan XC-72) suspensions in mineral oil, specifically the observation of sequential stress increase then decrease at a fixed shear rate in a step-down test. We verify that such dynamics, though peculiar, come from a true material response rather than experimental artifacts. We also reveal how this long-time stress decay is associated with antithixotropic structural change rather than viscoelastic stress relaxation by using orthogonal superposition (OSP) rheometry to probe viscoelastic moduli during the step-down tests. The orthogonal storage and loss moduli are present, showing this two-timescale recovery then decay response, which demonstrates that this response is antithixotropic, and it involves shear-induced structuring. We further show a mechanical anisotropy in the CB suspension under shear using OSP. Based on the rheological results, a microstructural schematic is proposed, considering qualitatively thixotropic structure build-up, antithixotropic densification, and anisotropic structure evolution. Our observation for these CB suspensions is outside the standard paradigm of thixotropic structure-parameter models, and the elastic response provides us with new insight into the transient dynamics of CB suspensions.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Joint Center for Energy Storage Research (JCESR)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC02-06CH11357
OSTI ID:
1982941
Journal Information:
Journal of Rheology, Vol. 66, Issue 5; ISSN 0148-6055
Publisher:
Society of Rheology
Country of Publication:
United States
Language:
English

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