Magnetically driven in-plane modulation of the 3D orientation of vertical ferromagnetic flakes

External magnetic fields are known to attract and orient magnetically responsive colloidal particles. In the case of 2D microplatelets, rotating magnetic fields are typically used to orient them parallel to each other in a brick-and-mortar fashion. Thanks to this microstructure, the resulting compos...

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Main Authors: Le Ferrand, Hortense, Arrieta, Andres F.
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2022
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Online Access:https://hdl.handle.net/10356/154530
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1545302022-05-06T05:29:54Z Magnetically driven in-plane modulation of the 3D orientation of vertical ferromagnetic flakes Le Ferrand, Hortense Arrieta, Andres F. School of Mechanical and Aerospace Engineering Engineering::Materials::Composite materials Ferromagnetic Materials 3D Orientation External magnetic fields are known to attract and orient magnetically responsive colloidal particles. In the case of 2D microplatelets, rotating magnetic fields are typically used to orient them parallel to each other in a brick-and-mortar fashion. Thanks to this microstructure, the resulting composites achieve enhanced mechanical and functional properties. However, parts with complex geometry require their microstructure to be specifically tuned and controlled locally in 3D. Although the tunability of the microstructure along the vertical direction has already been demonstrated using magnetic orientation combined with sequential or continuous casting, controlling the particle orientation in the horizontal plane in a fast and effective fashion remains challenging. Here, we propose to use rotating magnetic arrays to control the in-plane orientation of ferromagnetic Nickel flakes distributed in uncured polymeric matrices. We experimentally studied the orientation of the flakes in response to magnets rotating at various frequencies and precessing angles. Then, we used COMSOL to model the magnetic field from rotating magnetic arrays and predicted the resulting in-plane orientations. To validate the approach, we created composites with locally oriented flakes. This work could initiate reverse-engineering methods to design the microstructure in composite materials with intricate geometrical shapes for structural or functional applications. Ministry of Education (MOE) Submitted/Accepted version The authors acknowledge financial support from the Ministry of Education, Singapore under Grant No. 2019-T1-001-002. 2022-05-06T05:21:49Z 2022-05-06T05:21:49Z 2022 Journal Article Le Ferrand, H. & Arrieta, A. F. (2022). Magnetically driven in-plane modulation of the 3D orientation of vertical ferromagnetic flakes. Soft Matter, 18(5), 1054-1063. https://dx.doi.org/10.1039/D1SM01423D 1744-683X https://hdl.handle.net/10356/154530 10.1039/D1SM01423D 5 18 1054 1063 en RG81/19 (S) 2019-T1-001-002 Soft Matter © 2022 The Royal Society of Chemistry. All rights reserved. This paper was published in Soft Matter and is made available with permission of The Royal Society of Chemistry. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Materials::Composite materials
Ferromagnetic Materials
3D Orientation
spellingShingle Engineering::Materials::Composite materials
Ferromagnetic Materials
3D Orientation
Le Ferrand, Hortense
Arrieta, Andres F.
Magnetically driven in-plane modulation of the 3D orientation of vertical ferromagnetic flakes
description External magnetic fields are known to attract and orient magnetically responsive colloidal particles. In the case of 2D microplatelets, rotating magnetic fields are typically used to orient them parallel to each other in a brick-and-mortar fashion. Thanks to this microstructure, the resulting composites achieve enhanced mechanical and functional properties. However, parts with complex geometry require their microstructure to be specifically tuned and controlled locally in 3D. Although the tunability of the microstructure along the vertical direction has already been demonstrated using magnetic orientation combined with sequential or continuous casting, controlling the particle orientation in the horizontal plane in a fast and effective fashion remains challenging. Here, we propose to use rotating magnetic arrays to control the in-plane orientation of ferromagnetic Nickel flakes distributed in uncured polymeric matrices. We experimentally studied the orientation of the flakes in response to magnets rotating at various frequencies and precessing angles. Then, we used COMSOL to model the magnetic field from rotating magnetic arrays and predicted the resulting in-plane orientations. To validate the approach, we created composites with locally oriented flakes. This work could initiate reverse-engineering methods to design the microstructure in composite materials with intricate geometrical shapes for structural or functional applications.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Le Ferrand, Hortense
Arrieta, Andres F.
format Article
author Le Ferrand, Hortense
Arrieta, Andres F.
author_sort Le Ferrand, Hortense
title Magnetically driven in-plane modulation of the 3D orientation of vertical ferromagnetic flakes
title_short Magnetically driven in-plane modulation of the 3D orientation of vertical ferromagnetic flakes
title_full Magnetically driven in-plane modulation of the 3D orientation of vertical ferromagnetic flakes
title_fullStr Magnetically driven in-plane modulation of the 3D orientation of vertical ferromagnetic flakes
title_full_unstemmed Magnetically driven in-plane modulation of the 3D orientation of vertical ferromagnetic flakes
title_sort magnetically driven in-plane modulation of the 3d orientation of vertical ferromagnetic flakes
publishDate 2022
url https://hdl.handle.net/10356/154530
_version_ 1734310119152287744