Rheoacoustic Gels: Tuning Mechanical and Flow Properties of Colloidal Gels with Ultrasonic Vibrations

Colloidal gels, where nanoscale particles aggregate into an elastic yet fragile network, are at the heart of materials that combine specific optical, electrical, and mechanical properties. Tailoring the viscoelastic features of colloidal gels in real time thanks to an external stimulus currently app...

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Autores principales:	Thomas Gibaud, Noémie Dagès, Pierre Lidon, Guillaume Jung, L. Christian Ahouré, Michael Sztucki, Arnaud Poulesquen, Nicolas Hengl, Frédéric Pignon, Sébastien Manneville
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2020
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/03f6d17c9c6b4dc8b874186255e1ed1e
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spelling	oai:doaj.org-article:03f6d17c9c6b4dc8b874186255e1ed1e2021-12-02T12:06:35ZRheoacoustic Gels: Tuning Mechanical and Flow Properties of Colloidal Gels with Ultrasonic Vibrations10.1103/PhysRevX.10.0110282160-3308https://doaj.org/article/03f6d17c9c6b4dc8b874186255e1ed1e2020-02-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.10.011028http://doi.org/10.1103/PhysRevX.10.011028https://doaj.org/toc/2160-3308Colloidal gels, where nanoscale particles aggregate into an elastic yet fragile network, are at the heart of materials that combine specific optical, electrical, and mechanical properties. Tailoring the viscoelastic features of colloidal gels in real time thanks to an external stimulus currently appears as a major challenge in the design of “smart” soft materials. Here we introduce “rheoacoustic” gels, a class of materials that are sensitive to ultrasonic vibrations. By using a combination of rheological and structural characterization, we evidence and quantify a strong softening in three widely different colloidal gels submitted to ultrasonic vibrations (with submicron amplitude and frequency 20–500 kHz). This softening is attributed to micron-sized cracks within the gel network that may or may not fully heal once vibrations are turned off depending on the acoustic intensity. Ultrasonic vibrations are further shown to dramatically decrease the gel yield stress and accelerate shear-induced fluidization. Ultrasound-assisted fluidization dynamics appear to be governed by an effective temperature that depends on the acoustic intensity. Our work opens the way to a full control of elastic and flow properties by ultrasonic vibrations as well as to future theoretical and numerical modeling of such rheoacoustic gels.Thomas GibaudNoémie DagèsPierre LidonGuillaume JungL. Christian AhouréMichael SztuckiArnaud PoulesquenNicolas HenglFrédéric PignonSébastien MannevilleAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 10, Iss 1, p 011028 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Thomas Gibaud Noémie Dagès Pierre Lidon Guillaume Jung L. Christian Ahouré Michael Sztucki Arnaud Poulesquen Nicolas Hengl Frédéric Pignon Sébastien Manneville Rheoacoustic Gels: Tuning Mechanical and Flow Properties of Colloidal Gels with Ultrasonic Vibrations
description	Colloidal gels, where nanoscale particles aggregate into an elastic yet fragile network, are at the heart of materials that combine specific optical, electrical, and mechanical properties. Tailoring the viscoelastic features of colloidal gels in real time thanks to an external stimulus currently appears as a major challenge in the design of “smart” soft materials. Here we introduce “rheoacoustic” gels, a class of materials that are sensitive to ultrasonic vibrations. By using a combination of rheological and structural characterization, we evidence and quantify a strong softening in three widely different colloidal gels submitted to ultrasonic vibrations (with submicron amplitude and frequency 20–500 kHz). This softening is attributed to micron-sized cracks within the gel network that may or may not fully heal once vibrations are turned off depending on the acoustic intensity. Ultrasonic vibrations are further shown to dramatically decrease the gel yield stress and accelerate shear-induced fluidization. Ultrasound-assisted fluidization dynamics appear to be governed by an effective temperature that depends on the acoustic intensity. Our work opens the way to a full control of elastic and flow properties by ultrasonic vibrations as well as to future theoretical and numerical modeling of such rheoacoustic gels.
format	article
author	Thomas Gibaud Noémie Dagès Pierre Lidon Guillaume Jung L. Christian Ahouré Michael Sztucki Arnaud Poulesquen Nicolas Hengl Frédéric Pignon Sébastien Manneville
author_facet	Thomas Gibaud Noémie Dagès Pierre Lidon Guillaume Jung L. Christian Ahouré Michael Sztucki Arnaud Poulesquen Nicolas Hengl Frédéric Pignon Sébastien Manneville
author_sort	Thomas Gibaud
title	Rheoacoustic Gels: Tuning Mechanical and Flow Properties of Colloidal Gels with Ultrasonic Vibrations
title_short	Rheoacoustic Gels: Tuning Mechanical and Flow Properties of Colloidal Gels with Ultrasonic Vibrations
title_full	Rheoacoustic Gels: Tuning Mechanical and Flow Properties of Colloidal Gels with Ultrasonic Vibrations
title_fullStr	Rheoacoustic Gels: Tuning Mechanical and Flow Properties of Colloidal Gels with Ultrasonic Vibrations
title_full_unstemmed	Rheoacoustic Gels: Tuning Mechanical and Flow Properties of Colloidal Gels with Ultrasonic Vibrations
title_sort	rheoacoustic gels: tuning mechanical and flow properties of colloidal gels with ultrasonic vibrations
publisher	American Physical Society
publishDate	2020
url	https://doaj.org/article/03f6d17c9c6b4dc8b874186255e1ed1e
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Rheoacoustic Gels: Tuning Mechanical and Flow Properties of Colloidal Gels with Ultrasonic Vibrations

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