Colloidal gels made of carbon black particles dispersed in light mineral oil are “rheo-acoustic” materials, i.e., their mechanical and structural properties can be tuned using high-power ultrasound, sound waves with submicrometer amplitude and frequencies larger than 20 kHz. The effects of high-power ultrasound on the carbon black gel are demonstrated using two experiments: rheology coupled to ultrasound to test for the gel mechanical response and a time-resolved ultra-small-angle x-ray scattering experiment (TRUSAXS) coupled to ultrasound to test for structural changes within the gel. We show that high-power ultrasound above a critical amplitude leads to a complex viscoelastic transient response of the gels within a few seconds: a softening of its storage modulus accompanied by a strong overshoot in its loss modulus. Under high-power ultrasound, the gel displays a viscoelastic spectrum with glasslike features and a significant decrease in its yield strain. Those effects are attributed to the formation of intermittent microcracks in the bulk of the gel as evidenced by TRUSAXS. Provided that the shear rate is not large enough to fully fluidize the sample, high-power ultrasound also facilitates the flow of the gel, reducing its yield stress as well as increasing the shear-thinning index, thanks again to the formation of microcracks.
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Research Article|
May 01 2021
Mechanics and structure of carbon black gels under high-power ultrasound
Noémie Dagès;
Noémie Dagès
1
Univ Lyon, Ens de Lyon, Univ Claude Bernard, CNRS, Laboratoire de Physique
, F-69342 Lyon, France
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Pierre Lidon
;
Pierre Lidon
1
Univ Lyon, Ens de Lyon, Univ Claude Bernard, CNRS, Laboratoire de Physique
, F-69342 Lyon, France
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Guillaume Jung;
Guillaume Jung
1
Univ Lyon, Ens de Lyon, Univ Claude Bernard, CNRS, Laboratoire de Physique
, F-69342 Lyon, France
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Frédéric Pignon;
Frédéric Pignon
2
Univ Grenoble Alpes, CNRS, LRP
, F-38000 Grenoble, France
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Sébastien Manneville
;
Sébastien Manneville
1
Univ Lyon, Ens de Lyon, Univ Claude Bernard, CNRS, Laboratoire de Physique
, F-69342 Lyon, France
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Thomas Gibaud
Thomas Gibaud
a)
1
Univ Lyon, Ens de Lyon, Univ Claude Bernard, CNRS, Laboratoire de Physique
, F-69342 Lyon, France
a)Author to whom correspondence should be addressed; electronic mail: thomas.gibaud@ens-lyon.fr
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a)Author to whom correspondence should be addressed; electronic mail: thomas.gibaud@ens-lyon.fr
J. Rheol. 65, 477–490 (2021)
Article history
Received:
November 09 2020
Accepted:
March 01 2021
Citation
Noémie Dagès, Pierre Lidon, Guillaume Jung, Frédéric Pignon, Sébastien Manneville, Thomas Gibaud; Mechanics and structure of carbon black gels under high-power ultrasound. J. Rheol. 1 May 2021; 65 (3): 477–490. https://doi.org/10.1122/8.0000187
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