Anisotropic reversible piezoresistivity in magnetic-metallic/polymer structured elastomeric composites: Modelling and experiments

Structured elastomeric composites (SECs) with electrically conductive fillers display anisotropic piezoresistivity. The fillers do not form string-of-particle structures but pseudo-chains formed by grouping micro-sized clusters containing nanomagnetic particles surrounded by noble metals (e.g. silve...

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Autores principales: Mietta, J.L., Tamborenea, P.I., Martin Negri, R.
Formato: JOUR
Materias:
Anisotropy
Curing
Elastic moduli
Electron tunneling
Fillers
Iron oxides
Magnetite
Silicones
Contact resistivities
Elastomeric composite
Electrical conduction
Electrical resistances
Electrically conductive
Modelling and experiments
Nanomagnetic particles
Uniform magnetic fields
Chains
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_1744683X_v12_n2_p422_Mietta
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_1744683X_v12_n2_p422_Mietta2023-10-03T16:31:47Z Anisotropic reversible piezoresistivity in magnetic-metallic/polymer structured elastomeric composites: Modelling and experiments Mietta, J.L. Tamborenea, P.I. Martin Negri, R. Anisotropy Curing Elastic moduli Electron tunneling Fillers Iron oxides Magnetite Silicones Contact resistivities Elastomeric composite Electrical conduction Electrical resistances Electrically conductive Modelling and experiments Nanomagnetic particles Uniform magnetic fields Chains Structured elastomeric composites (SECs) with electrically conductive fillers display anisotropic piezoresistivity. The fillers do not form string-of-particle structures but pseudo-chains formed by grouping micro-sized clusters containing nanomagnetic particles surrounded by noble metals (e.g. silver, Ag). The pseudo-chains are formed when curing or preparing the composite in the presence of a uniform magnetic field, thus pseudo-chains are aligned in the direction of the field. The electrical conduction through pseudo-chains is analyzed and a constitutive model for the anisotropic reversible piezoresistivity in SECs is proposed. Several effects and characteristics, such as electron tunnelling, conduction inside the pseudo-chains, and chain-contact resistivity, are included in the model. Experimental results of electrical resistance, R, as a function of the normal stress applied in the direction of the pseudo-chains, P, are very well fitted by the model in the case of Fe3O4[Ag] microparticles magnetically aligned while curing in polydimethylsiloxane, PDMS. The cross sensitivity of different parameters (like the potential barrier and the effective distance for electron tunnelling) is evaluated. The model predicts the presence of several gaps for electron tunnelling inside the pseudo-chains. Estimates of those parameters for the mentioned experimental system under strains up to 20% are presented. Simulations of the expected response for other systems are performed showing the influence of Young's modulus and other parameters on the predicted piezoresistivity. © 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_n2_p422_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
Curing
Elastic moduli
Electron tunneling
Fillers
Iron oxides
Magnetite
Silicones
Contact resistivities
Elastomeric composite
Electrical conduction
Electrical resistances
Electrically conductive
Modelling and experiments
Nanomagnetic particles
Uniform magnetic fields
Chains
spellingShingle Anisotropy
Curing
Elastic moduli
Electron tunneling
Fillers
Iron oxides
Magnetite
Silicones
Contact resistivities
Elastomeric composite
Electrical conduction
Electrical resistances
Electrically conductive
Modelling and experiments
Nanomagnetic particles
Uniform magnetic fields
Chains
Mietta, J.L.
Tamborenea, P.I.
Martin Negri, R.
Anisotropic reversible piezoresistivity in magnetic-metallic/polymer structured elastomeric composites: Modelling and experiments
topic_facet Anisotropy
Curing
Elastic moduli
Electron tunneling
Fillers
Iron oxides
Magnetite
Silicones
Contact resistivities
Elastomeric composite
Electrical conduction
Electrical resistances
Electrically conductive
Modelling and experiments
Nanomagnetic particles
Uniform magnetic fields
Chains
description Structured elastomeric composites (SECs) with electrically conductive fillers display anisotropic piezoresistivity. The fillers do not form string-of-particle structures but pseudo-chains formed by grouping micro-sized clusters containing nanomagnetic particles surrounded by noble metals (e.g. silver, Ag). The pseudo-chains are formed when curing or preparing the composite in the presence of a uniform magnetic field, thus pseudo-chains are aligned in the direction of the field. The electrical conduction through pseudo-chains is analyzed and a constitutive model for the anisotropic reversible piezoresistivity in SECs is proposed. Several effects and characteristics, such as electron tunnelling, conduction inside the pseudo-chains, and chain-contact resistivity, are included in the model. Experimental results of electrical resistance, R, as a function of the normal stress applied in the direction of the pseudo-chains, P, are very well fitted by the model in the case of Fe3O4[Ag] microparticles magnetically aligned while curing in polydimethylsiloxane, PDMS. The cross sensitivity of different parameters (like the potential barrier and the effective distance for electron tunnelling) is evaluated. The model predicts the presence of several gaps for electron tunnelling inside the pseudo-chains. Estimates of those parameters for the mentioned experimental system under strains up to 20% are presented. Simulations of the expected response for other systems are performed showing the influence of Young's modulus and other parameters on the predicted piezoresistivity. © 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 reversible piezoresistivity in magnetic-metallic/polymer structured elastomeric composites: Modelling and experiments
title_short Anisotropic reversible piezoresistivity in magnetic-metallic/polymer structured elastomeric composites: Modelling and experiments
title_full Anisotropic reversible piezoresistivity in magnetic-metallic/polymer structured elastomeric composites: Modelling and experiments
title_fullStr Anisotropic reversible piezoresistivity in magnetic-metallic/polymer structured elastomeric composites: Modelling and experiments
title_full_unstemmed Anisotropic reversible piezoresistivity in magnetic-metallic/polymer structured elastomeric composites: Modelling and experiments
title_sort anisotropic reversible piezoresistivity in magnetic-metallic/polymer structured elastomeric composites: modelling and experiments
url http://hdl.handle.net/20.500.12110/paper_1744683X_v12_n2_p422_Mietta
work_keys_str_mv AT miettajl anisotropicreversiblepiezoresistivityinmagneticmetallicpolymerstructuredelastomericcompositesmodellingandexperiments
AT tamboreneapi anisotropicreversiblepiezoresistivityinmagneticmetallicpolymerstructuredelastomericcompositesmodellingandexperiments
AT martinnegrir anisotropicreversiblepiezoresistivityinmagneticmetallicpolymerstructuredelastomericcompositesmodellingandexperiments
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