Anisotropic magnetoresistivity in structured elastomer composites: Modelling and experiments
A constitutive model for the anisotropic magnetoresistivity in structured elastomer composites (SECs) is proposed. The SECs considered here are oriented pseudo-chains of conductive-magnetic inorganic materials inside an elastomer organic matrix. The pseudo-chains are formed by fillers which are simu...
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2016
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1744683X_v12_n30_p6430_Mietta http://hdl.handle.net/20.500.12110/paper_1744683X_v12_n30_p6430_Mietta |
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paper:paper_1744683X_v12_n30_p6430_Mietta2023-06-08T16:28:13Z Anisotropic magnetoresistivity in structured elastomer composites: Modelling and experiments Tamborenea, Pablo Ignacio Negri, Ricardo Martin Anisotropy Chains Conductive materials Constitutive models Curing Elastic moduli Elastomers Magnetic fields Magnetism Magnetization Magnetoresistance Plastics Saturation magnetization Silicones Silver Elastomer composites Electrical conduction External magnetic field Inorganic materials Magnetoelastic couplings Modelling and experiments Tunnelling probability Uniform magnetic fields Fillers A constitutive model for the anisotropic magnetoresistivity in structured elastomer composites (SECs) is proposed. The SECs considered here are oriented pseudo-chains of conductive-magnetic inorganic materials inside an elastomer organic matrix. The pseudo-chains are formed by fillers which are simultaneously conductive and magnetic dispersed in the polymer before curing or solvent evaporation. The SEC is then prepared in the presence of a uniform magnetic field, referred to as Hcuring. This procedure generates the pseudo-chains, which are preferentially aligned in the direction of Hcuring. Electrical conduction is present in that direction only. The constitutive model for the magnetoresistance considers the magnetic pressure, Pmag, induced on the pseudo-chains by an external magnetic field, H, applied in the direction of the pseudo-chains. The relative changes in conductivity as a function of H are calculated by evaluating the relative increase of the electron tunnelling probability with Pmag, a magneto-elastic coupling which produces an increase of conductivity with magnetization. The model is used to adjust experimental results of magnetoresistance in a specific SEC where the polymer is polydimethylsiloxane, PDMS, and fillers are microparticles of magnetite-silver (referred to as Fe3O4[Ag]). Simulations of the expected response for other materials in both superparamagnetic and blocked magnetic states are presented, showing the influence of the Young's modulus of the matrix and filler's saturation magnetization. © The Royal Society of Chemistry 2016. Fil:Tamborenea, P.I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Martin Negri, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1744683X_v12_n30_p6430_Mietta http://hdl.handle.net/20.500.12110/paper_1744683X_v12_n30_p6430_Mietta |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Anisotropy Chains Conductive materials Constitutive models Curing Elastic moduli Elastomers Magnetic fields Magnetism Magnetization Magnetoresistance Plastics Saturation magnetization Silicones Silver Elastomer composites Electrical conduction External magnetic field Inorganic materials Magnetoelastic couplings Modelling and experiments Tunnelling probability Uniform magnetic fields Fillers |
| spellingShingle |
Anisotropy Chains Conductive materials Constitutive models Curing Elastic moduli Elastomers Magnetic fields Magnetism Magnetization Magnetoresistance Plastics Saturation magnetization Silicones Silver Elastomer composites Electrical conduction External magnetic field Inorganic materials Magnetoelastic couplings Modelling and experiments Tunnelling probability Uniform magnetic fields Fillers Tamborenea, Pablo Ignacio Negri, Ricardo Martin Anisotropic magnetoresistivity in structured elastomer composites: Modelling and experiments |
| topic_facet |
Anisotropy Chains Conductive materials Constitutive models Curing Elastic moduli Elastomers Magnetic fields Magnetism Magnetization Magnetoresistance Plastics Saturation magnetization Silicones Silver Elastomer composites Electrical conduction External magnetic field Inorganic materials Magnetoelastic couplings Modelling and experiments Tunnelling probability Uniform magnetic fields Fillers |
| description |
A constitutive model for the anisotropic magnetoresistivity in structured elastomer composites (SECs) is proposed. The SECs considered here are oriented pseudo-chains of conductive-magnetic inorganic materials inside an elastomer organic matrix. The pseudo-chains are formed by fillers which are simultaneously conductive and magnetic dispersed in the polymer before curing or solvent evaporation. The SEC is then prepared in the presence of a uniform magnetic field, referred to as Hcuring. This procedure generates the pseudo-chains, which are preferentially aligned in the direction of Hcuring. Electrical conduction is present in that direction only. The constitutive model for the magnetoresistance considers the magnetic pressure, Pmag, induced on the pseudo-chains by an external magnetic field, H, applied in the direction of the pseudo-chains. The relative changes in conductivity as a function of H are calculated by evaluating the relative increase of the electron tunnelling probability with Pmag, a magneto-elastic coupling which produces an increase of conductivity with magnetization. The model is used to adjust experimental results of magnetoresistance in a specific SEC where the polymer is polydimethylsiloxane, PDMS, and fillers are microparticles of magnetite-silver (referred to as Fe3O4[Ag]). Simulations of the expected response for other materials in both superparamagnetic and blocked magnetic states are presented, showing the influence of the Young's modulus of the matrix and filler's saturation magnetization. © The Royal Society of Chemistry 2016. |
| author |
Tamborenea, Pablo Ignacio Negri, Ricardo Martin |
| author_facet |
Tamborenea, Pablo Ignacio Negri, Ricardo Martin |
| author_sort |
Tamborenea, Pablo Ignacio |
| title |
Anisotropic magnetoresistivity in structured elastomer composites: Modelling and experiments |
| title_short |
Anisotropic magnetoresistivity in structured elastomer composites: Modelling and experiments |
| title_full |
Anisotropic magnetoresistivity in structured elastomer composites: Modelling and experiments |
| title_fullStr |
Anisotropic magnetoresistivity in structured elastomer composites: Modelling and experiments |
| title_full_unstemmed |
Anisotropic magnetoresistivity in structured elastomer composites: Modelling and experiments |
| title_sort |
anisotropic magnetoresistivity in structured elastomer composites: modelling and experiments |
| publishDate |
2016 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1744683X_v12_n30_p6430_Mietta http://hdl.handle.net/20.500.12110/paper_1744683X_v12_n30_p6430_Mietta |
| work_keys_str_mv |
AT tamboreneapabloignacio anisotropicmagnetoresistivityinstructuredelastomercompositesmodellingandexperiments AT negriricardomartin anisotropicmagnetoresistivityinstructuredelastomercompositesmodellingandexperiments |
| _version_ |
1768542859128995840 |