Superparamagnetic colloids in viscous fluids

Abstract The influence of a magnetic field on the aggregation process of superparamagnetic colloids has been well known on short time for a few decades. However, the influence of important parameters, such as viscosity of the liquid, has received only little attention. Moreover, the equilibrium stat...

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Autores principales:	A. Darras, E. Opsomer, N. Vandewalle, G. Lumay
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/94b4514e187f40f48f0adf31bc2e1e5a
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spelling	oai:doaj.org-article:94b4514e187f40f48f0adf31bc2e1e5a2021-12-02T15:06:01ZSuperparamagnetic colloids in viscous fluids10.1038/s41598-017-07917-y2045-2322https://doaj.org/article/94b4514e187f40f48f0adf31bc2e1e5a2017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-07917-yhttps://doaj.org/toc/2045-2322Abstract The influence of a magnetic field on the aggregation process of superparamagnetic colloids has been well known on short time for a few decades. However, the influence of important parameters, such as viscosity of the liquid, has received only little attention. Moreover, the equilibrium state reached after a long time is still challenging on some aspects. Indeed, recent experimental measurements show deviations from pure analytical models in extreme conditions. Furthermore, current simulations would require several years of computing time to reach equilibrium state under those conditions. In the present paper, we show how viscosity influences the characteristic time of the aggregation process, with experimental measurements in agreement with previous theories on transient behaviour. Afterwards, we performed numerical simulations on equivalent systems with lower viscosities. Below a critical value of viscosity, a transition to a new aggregation regime is observed and analysed. We noticed this result can be used to reduce the numerical simulation time from several orders of magnitude, without modifying the intrinsic physical behaviour of the particles. However, it also implies that, for high magnetic fields, granular gases could have a very different behaviour from colloidal liquids.A. DarrasE. OpsomerN. VandewalleG. LumayNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q A. Darras E. Opsomer N. Vandewalle G. Lumay Superparamagnetic colloids in viscous fluids
description	Abstract The influence of a magnetic field on the aggregation process of superparamagnetic colloids has been well known on short time for a few decades. However, the influence of important parameters, such as viscosity of the liquid, has received only little attention. Moreover, the equilibrium state reached after a long time is still challenging on some aspects. Indeed, recent experimental measurements show deviations from pure analytical models in extreme conditions. Furthermore, current simulations would require several years of computing time to reach equilibrium state under those conditions. In the present paper, we show how viscosity influences the characteristic time of the aggregation process, with experimental measurements in agreement with previous theories on transient behaviour. Afterwards, we performed numerical simulations on equivalent systems with lower viscosities. Below a critical value of viscosity, a transition to a new aggregation regime is observed and analysed. We noticed this result can be used to reduce the numerical simulation time from several orders of magnitude, without modifying the intrinsic physical behaviour of the particles. However, it also implies that, for high magnetic fields, granular gases could have a very different behaviour from colloidal liquids.
format	article
author	A. Darras E. Opsomer N. Vandewalle G. Lumay
author_facet	A. Darras E. Opsomer N. Vandewalle G. Lumay
author_sort	A. Darras
title	Superparamagnetic colloids in viscous fluids
title_short	Superparamagnetic colloids in viscous fluids
title_full	Superparamagnetic colloids in viscous fluids
title_fullStr	Superparamagnetic colloids in viscous fluids
title_full_unstemmed	Superparamagnetic colloids in viscous fluids
title_sort	superparamagnetic colloids in viscous fluids
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/94b4514e187f40f48f0adf31bc2e1e5a
work_keys_str_mv	AT adarras superparamagneticcolloidsinviscousfluids AT eopsomer superparamagneticcolloidsinviscousfluids AT nvandewalle superparamagneticcolloidsinviscousfluids AT glumay superparamagneticcolloidsinviscousfluids
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Superparamagnetic colloids in viscous fluids

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