Spin-coating of moderately concentrated superparamagnetic colloids in different magnetic field configurations

Spin-coating technique is very fast, cheap, reproducible, simple and needs less material to fabricate films of particulate systems/colloids. Their thickness and uniformity may be controlled by means of external fields. We apply magnetic fields during the spin-coating of a moderately concentrated sup...

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Autores: Gonzalez-Viñas, W. (Wenceslao)|||/items/51b6a297-7659-424d-acc7-efea981f638d, Muhammad-Aslam, R. (Raheema)|||/items/821b0ee5-a583-4fa3-abc1-21e22c46c7c0
Tipo de recurso: artículo
Fecha de publicación:2017
País:España
Institución:Universidad de Navarra
Repositorio:Dadun. Depósito Académico Digital de la Universidad de Navarra
Idioma:inglés
OAI Identifier:oai:dadun.unav.edu:10171/58030
Acceso en línea:https://hdl.handle.net/10171/58030
Access Level:acceso abierto
Palabra clave:Spin-coating
Superparamagnetic colloids
Magnetoviscosity
Magnetic field gradient
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spelling Spin-coating of moderately concentrated superparamagnetic colloids in different magnetic field configurationsGonzalez-Viñas, W. (Wenceslao)|||/items/51b6a297-7659-424d-acc7-efea981f638dMuhammad-Aslam, R. (Raheema)|||/items/821b0ee5-a583-4fa3-abc1-21e22c46c7c0Spin-coatingSuperparamagnetic colloidsMagnetoviscosityMagnetic field gradientSpin-coating technique is very fast, cheap, reproducible, simple and needs less material to fabricate films of particulate systems/colloids. Their thickness and uniformity may be controlled by means of external fields. We apply magnetic fields during the spin-coating of a moderately concentrated superparamagnetic colloid (made of silica coated magnetite particles). We study the influence of different magnetic field configurations (homogeneous and inhomogeneous) on the resulting spin-coated deposits and compare experimental results under various conditions. Superparamagnetic colloids behave as, non-Newtonian, magnetorheological fluids. Their viscosity vary significantly under applied magnetic fields. We measure and compare the effect of uniform and non-uniform magnetic fields on their relative effective viscosity, using the spin-coated deposits and a previously existing model for simple colloids. The mechanisms involved in the deposits formation under different experimental conditions are also discussed. In particular, we show that the magnetophoretic effect plays an important role in the spin-coating of magnetic colloids subjected to non-uniform magnetic fields. We characterize an effective magnetoviscosity in non-uniform magnetic fields that is largely influenced by the magnetophoretic effect that enhances the flow of the magnetic fluid.Dadun. Depósito Académico Digital Universidad de Navarra20192019-07-2920172017-01-0120172017-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/10171/58030reponame:Dadun. Depósito Académico Digital de la Universidad de Navarrainstname:Universidad de NavarraInglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:dadun.unav.edu:10171/580302026-06-21T12:47:57Z
dc.title.none.fl_str_mv Spin-coating of moderately concentrated superparamagnetic colloids in different magnetic field configurations
title Spin-coating of moderately concentrated superparamagnetic colloids in different magnetic field configurations
spellingShingle Spin-coating of moderately concentrated superparamagnetic colloids in different magnetic field configurations
Gonzalez-Viñas, W. (Wenceslao)|||/items/51b6a297-7659-424d-acc7-efea981f638d
Spin-coating
Superparamagnetic colloids
Magnetoviscosity
Magnetic field gradient
title_short Spin-coating of moderately concentrated superparamagnetic colloids in different magnetic field configurations
title_full Spin-coating of moderately concentrated superparamagnetic colloids in different magnetic field configurations
title_fullStr Spin-coating of moderately concentrated superparamagnetic colloids in different magnetic field configurations
title_full_unstemmed Spin-coating of moderately concentrated superparamagnetic colloids in different magnetic field configurations
title_sort Spin-coating of moderately concentrated superparamagnetic colloids in different magnetic field configurations
dc.creator.none.fl_str_mv Gonzalez-Viñas, W. (Wenceslao)|||/items/51b6a297-7659-424d-acc7-efea981f638d
Muhammad-Aslam, R. (Raheema)|||/items/821b0ee5-a583-4fa3-abc1-21e22c46c7c0
author Gonzalez-Viñas, W. (Wenceslao)|||/items/51b6a297-7659-424d-acc7-efea981f638d
author_facet Gonzalez-Viñas, W. (Wenceslao)|||/items/51b6a297-7659-424d-acc7-efea981f638d
Muhammad-Aslam, R. (Raheema)|||/items/821b0ee5-a583-4fa3-abc1-21e22c46c7c0
author_role author
author2 Muhammad-Aslam, R. (Raheema)|||/items/821b0ee5-a583-4fa3-abc1-21e22c46c7c0
author2_role author
dc.contributor.none.fl_str_mv Dadun. Depósito Académico Digital Universidad de Navarra
dc.subject.none.fl_str_mv Spin-coating
Superparamagnetic colloids
Magnetoviscosity
Magnetic field gradient
topic Spin-coating
Superparamagnetic colloids
Magnetoviscosity
Magnetic field gradient
description Spin-coating technique is very fast, cheap, reproducible, simple and needs less material to fabricate films of particulate systems/colloids. Their thickness and uniformity may be controlled by means of external fields. We apply magnetic fields during the spin-coating of a moderately concentrated superparamagnetic colloid (made of silica coated magnetite particles). We study the influence of different magnetic field configurations (homogeneous and inhomogeneous) on the resulting spin-coated deposits and compare experimental results under various conditions. Superparamagnetic colloids behave as, non-Newtonian, magnetorheological fluids. Their viscosity vary significantly under applied magnetic fields. We measure and compare the effect of uniform and non-uniform magnetic fields on their relative effective viscosity, using the spin-coated deposits and a previously existing model for simple colloids. The mechanisms involved in the deposits formation under different experimental conditions are also discussed. In particular, we show that the magnetophoretic effect plays an important role in the spin-coating of magnetic colloids subjected to non-uniform magnetic fields. We characterize an effective magnetoviscosity in non-uniform magnetic fields that is largely influenced by the magnetophoretic effect that enhances the flow of the magnetic fluid.
publishDate 2017
dc.date.none.fl_str_mv 2017
2017-01-01
2017
2017-01-01
2019
2019-07-29
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/10171/58030
url https://hdl.handle.net/10171/58030
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Dadun. Depósito Académico Digital de la Universidad de Navarra
instname:Universidad de Navarra
instname_str Universidad de Navarra
reponame_str Dadun. Depósito Académico Digital de la Universidad de Navarra
collection Dadun. Depósito Académico Digital de la Universidad de Navarra
repository.name.fl_str_mv
repository.mail.fl_str_mv
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