Freestanding and flexible composites of magnetocaloric Gd5(Si,Ge)4 microparticles embedded in thermoplastic poly(methyl methacrylate) matrix

Freestanding and flexible composites of magnetocaloric Gd5(Si,Ge)4 microparticles embedded in thermoplastic poly(methyl methacrylate) matrix

The implementation of processed magnetic materials onto thermoplastics can be an approach for practical use of brittle intermetallic materials on device development with the advantage of enlarging the range of applications. In this paper, we present the evaluation on the effect of blending magnetoca...

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Main Authors: Vivian M. Andrade, Nathalie B. Barroca, Ana L. Pires, João H. Belo, André M. Pereira, Kleber R. Pirota, João P. Araújo
Format: Article
Language:English
Published: Elsevier 2020-01-01
Series:Materials & Design
Online Access:http://www.sciencedirect.com/science/article/pii/S0264127519307920
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spelling doaj-b5221eb0c1e94528bfcec1baaabc19642020-11-25T02:44:01ZengElsevierMaterials & Design0264-12752020-01-01186Freestanding and flexible composites of magnetocaloric Gd5(Si,Ge)4 microparticles embedded in thermoplastic poly(methyl methacrylate) matrixVivian M. Andrade0Nathalie B. Barroca1Ana L. Pires2João H. Belo3André M. Pereira4Kleber R. Pirota5João P. Araújo6Institute of Physics for Advanced Materials, Nanotechnology and Photonics (IFIMUP), Physics and Astronomy Department, Science Faculty University of Porto, Rua do Campo Alegre, 687, Porto 4169-007, Portugal; ’Gleb Wataghin’ Physics Institute, State University of Campinas (IFGW-UNICAMP), Rua Sergio Buarque de Holanda, 777, Campinas 13083-859 - SP, Brazil; Corresponding author at: ‘Gleb Wataghin’ Physics Institute, State University of Campinas (IFGW-UNICAMP), Rua Sergio Buarque de Holanda, 777, Campinas - SP 13083-859, Brazil.Institute of Physics for Advanced Materials, Nanotechnology and Photonics (IFIMUP), Physics and Astronomy Department, Science Faculty University of Porto, Rua do Campo Alegre, 687, Porto 4169-007, PortugalInstitute of Physics for Advanced Materials, Nanotechnology and Photonics (IFIMUP), Physics and Astronomy Department, Science Faculty University of Porto, Rua do Campo Alegre, 687, Porto 4169-007, PortugalInstitute of Physics for Advanced Materials, Nanotechnology and Photonics (IFIMUP), Physics and Astronomy Department, Science Faculty University of Porto, Rua do Campo Alegre, 687, Porto 4169-007, PortugalInstitute of Physics for Advanced Materials, Nanotechnology and Photonics (IFIMUP), Physics and Astronomy Department, Science Faculty University of Porto, Rua do Campo Alegre, 687, Porto 4169-007, Portugal’Gleb Wataghin’ Physics Institute, State University of Campinas (IFGW-UNICAMP), Rua Sergio Buarque de Holanda, 777, Campinas 13083-859 - SP, BrazilInstitute of Physics for Advanced Materials, Nanotechnology and Photonics (IFIMUP), Physics and Astronomy Department, Science Faculty University of Porto, Rua do Campo Alegre, 687, Porto 4169-007, PortugalThe implementation of processed magnetic materials onto thermoplastics can be an approach for practical use of brittle intermetallic materials on device development with the advantage of enlarging the range of applications. In this paper, we present the evaluation on the effect of blending magnetocaloric Gd5Si2.4Ge1.6 3.4 μm particles with in different weight fractions onto a flexible, transparent and non-magnetic poly(methyl methacrylate) (PMMA). A close to homogeneous grain distribution along the polymer surface were achieved by using a simple solvent casting method for their magnetocaloric properties studies. From XRD analysis, it was found a unit cell volume shrinkage by increasing the powder concentration followed by a reduction on the amount of secondary monoclinic phase as a result of interfacial interactions. As a consequence, a weakening of secondary phases effect on the composite magnetocaloric behavior is observed as a result of the effective hydrostatic pressure from the difference between thermal expansions of matrix and filler. Keywords: Magnetocaloric effect, Magnetic composite, Flexible composite, Blended microparticleshttp://www.sciencedirect.com/science/article/pii/S0264127519307920
collection DOAJ
language English
format Article
sources DOAJ
author Vivian M. Andrade
Nathalie B. Barroca
Ana L. Pires
João H. Belo
André M. Pereira
Kleber R. Pirota
João P. Araújo
spellingShingle Vivian M. Andrade
Nathalie B. Barroca
Ana L. Pires
João H. Belo
André M. Pereira
Kleber R. Pirota
João P. Araújo
Freestanding and flexible composites of magnetocaloric Gd5(Si,Ge)4 microparticles embedded in thermoplastic poly(methyl methacrylate) matrix
Materials & Design
author_facet Vivian M. Andrade
Nathalie B. Barroca
Ana L. Pires
João H. Belo
André M. Pereira
Kleber R. Pirota
João P. Araújo
author_sort Vivian M. Andrade
title Freestanding and flexible composites of magnetocaloric Gd5(Si,Ge)4 microparticles embedded in thermoplastic poly(methyl methacrylate) matrix
title_short Freestanding and flexible composites of magnetocaloric Gd5(Si,Ge)4 microparticles embedded in thermoplastic poly(methyl methacrylate) matrix
title_full Freestanding and flexible composites of magnetocaloric Gd5(Si,Ge)4 microparticles embedded in thermoplastic poly(methyl methacrylate) matrix
title_fullStr Freestanding and flexible composites of magnetocaloric Gd5(Si,Ge)4 microparticles embedded in thermoplastic poly(methyl methacrylate) matrix
title_full_unstemmed Freestanding and flexible composites of magnetocaloric Gd5(Si,Ge)4 microparticles embedded in thermoplastic poly(methyl methacrylate) matrix
title_sort freestanding and flexible composites of magnetocaloric gd5(si,ge)4 microparticles embedded in thermoplastic poly(methyl methacrylate) matrix
publisher Elsevier
series Materials & Design
issn 0264-1275
publishDate 2020-01-01
description The implementation of processed magnetic materials onto thermoplastics can be an approach for practical use of brittle intermetallic materials on device development with the advantage of enlarging the range of applications. In this paper, we present the evaluation on the effect of blending magnetocaloric Gd5Si2.4Ge1.6 3.4 μm particles with in different weight fractions onto a flexible, transparent and non-magnetic poly(methyl methacrylate) (PMMA). A close to homogeneous grain distribution along the polymer surface were achieved by using a simple solvent casting method for their magnetocaloric properties studies. From XRD analysis, it was found a unit cell volume shrinkage by increasing the powder concentration followed by a reduction on the amount of secondary monoclinic phase as a result of interfacial interactions. As a consequence, a weakening of secondary phases effect on the composite magnetocaloric behavior is observed as a result of the effective hydrostatic pressure from the difference between thermal expansions of matrix and filler. Keywords: Magnetocaloric effect, Magnetic composite, Flexible composite, Blended microparticles
url http://www.sciencedirect.com/science/article/pii/S0264127519307920
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