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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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_1744683X_v12_n30_p6430_Mietta |
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todo:paper_1744683X_v12_n30_p6430_Mietta2023-10-03T16:31:48Z Anisotropic magnetoresistivity in structured elastomer composites: Modelling and experiments Mietta, J.L. Tamborenea, P.I. Martin Negri, R. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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 Mietta, J.L. Tamborenea, P.I. Martin Negri, R. 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. |
| format |
JOUR |
| author |
Mietta, J.L. Tamborenea, P.I. Martin Negri, R. |
| author_facet |
Mietta, J.L. Tamborenea, P.I. Martin Negri, R. |
| author_sort |
Mietta, J.L. |
| 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 |
| url |
http://hdl.handle.net/20.500.12110/paper_1744683X_v12_n30_p6430_Mietta |
| work_keys_str_mv |
AT miettajl anisotropicmagnetoresistivityinstructuredelastomercompositesmodellingandexperiments AT tamboreneapi anisotropicmagnetoresistivityinstructuredelastomercompositesmodellingandexperiments AT martinnegrir anisotropicmagnetoresistivityinstructuredelastomercompositesmodellingandexperiments |
| _version_ |
1807316029622190080 |