A model for the dependence of the electrical conductance with the applied stress in insulating-conducting composites

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A model for the dependence of the electrical conductance, G, with the strain induced by external mechanical stress in conducting particles-polymer composites is presented. The model assumes that the percolation probability between neighboring particles must depart from a scale-invariant behavior but...

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Autores principales: Negri, R.M., Rodriguez, S.D., Bernik, D.L., Molina, F.V., Pilosof, A., Perez, O.
Formato: Artículo publishedVersion
Lenguaje:Inglés
Publicado: 2010
Materias:
Applied pressure
Applied stress
Conducting composites
Conducting particles
Critical exponent
Elastic response
Elastomer composites
Electrical conductance
High strains
Mechanical stress
Nonuniversal effects
Percolation path
Percolation probability
Piezoresistivity coefficient
Polymer composite
Scale-invariant
Simulated behaviors
Texture analyzers
Uni-axial compression
Electric conductance
Silicones
Solvents
Strain
Stresses
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00218979_v107_n11_p_Negri
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paperaa:paper_00218979_v107_n11_p_Negri2023-06-12T16:42:32Z A model for the dependence of the electrical conductance with the applied stress in insulating-conducting composites J Appl Phys 2010;107(11) Negri, R.M. Rodriguez, S.D. Bernik, D.L. Molina, F.V. Pilosof, A. Perez, O. Applied pressure Applied stress Conducting composites Conducting particles Critical exponent Elastic response Elastomer composites Electrical conductance High strains Mechanical stress Nonuniversal effects Percolation path Percolation probability Piezoresistivity coefficient Polymer composite Scale-invariant Simulated behaviors Texture analyzers Uni-axial compression Electric conductance Silicones Solvents Strain Stresses A model for the dependence of the electrical conductance, G, with the strain induced by external mechanical stress in conducting particles-polymer composites is presented. The model assumes that the percolation probability between neighboring particles must depart from a scale-invariant behavior but saturate at moderated-high strains, reaching percolation path's saturation, with sigmoid dependence. This dependence is obtained by proposing a dynamic picture where contacts or bonds between neighboring particles are created but also destructed when a stress is applied and relatively moderated or high strains, ε, are produced in the composite. The electrical conductance of prepared graphite-polydimethylsiloxane composites were measured as function of the applied pressure and fitted by the presented model. The elastic response to the uniaxial compression was studied using a texture analyzer. The possibility of nonuniversal effects in the conduction critical exponent, t, was taken into account. It is concluded that the saturation of the response in the G versus ε plots cannot be assigned to nonuniversal behavior of the exponent t, or to saturation of the elastic response. On the other hand, the presented model accounts for all the main experimental features observed in these systems and for previously reported data of elastomer composites. The simulated behavior of the piezoresistivity coefficient is also in qualitative agreement with previous reports. © 2010 American Institute of Physics. Fil:Negri, R.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Rodriguez, S.D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Bernik, D.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Molina, F.V. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Pilosof, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Perez, O. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2010 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion application/pdf eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00218979_v107_n11_p_Negri
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language Inglés
orig_language_str_mv eng
topic Applied pressure
Applied stress
Conducting composites
Conducting particles
Critical exponent
Elastic response
Elastomer composites
Electrical conductance
High strains
Mechanical stress
Nonuniversal effects
Percolation path
Percolation probability
Piezoresistivity coefficient
Polymer composite
Scale-invariant
Simulated behaviors
Texture analyzers
Uni-axial compression
Electric conductance
Silicones
Solvents
Strain
Stresses
spellingShingle Applied pressure
Applied stress
Conducting composites
Conducting particles
Critical exponent
Elastic response
Elastomer composites
Electrical conductance
High strains
Mechanical stress
Nonuniversal effects
Percolation path
Percolation probability
Piezoresistivity coefficient
Polymer composite
Scale-invariant
Simulated behaviors
Texture analyzers
Uni-axial compression
Electric conductance
Silicones
Solvents
Strain
Stresses
Negri, R.M.
Rodriguez, S.D.
Bernik, D.L.
Molina, F.V.
Pilosof, A.
Perez, O.
A model for the dependence of the electrical conductance with the applied stress in insulating-conducting composites
topic_facet Applied pressure
Applied stress
Conducting composites
Conducting particles
Critical exponent
Elastic response
Elastomer composites
Electrical conductance
High strains
Mechanical stress
Nonuniversal effects
Percolation path
Percolation probability
Piezoresistivity coefficient
Polymer composite
Scale-invariant
Simulated behaviors
Texture analyzers
Uni-axial compression
Electric conductance
Silicones
Solvents
Strain
Stresses
description A model for the dependence of the electrical conductance, G, with the strain induced by external mechanical stress in conducting particles-polymer composites is presented. The model assumes that the percolation probability between neighboring particles must depart from a scale-invariant behavior but saturate at moderated-high strains, reaching percolation path's saturation, with sigmoid dependence. This dependence is obtained by proposing a dynamic picture where contacts or bonds between neighboring particles are created but also destructed when a stress is applied and relatively moderated or high strains, ε, are produced in the composite. The electrical conductance of prepared graphite-polydimethylsiloxane composites were measured as function of the applied pressure and fitted by the presented model. The elastic response to the uniaxial compression was studied using a texture analyzer. The possibility of nonuniversal effects in the conduction critical exponent, t, was taken into account. It is concluded that the saturation of the response in the G versus ε plots cannot be assigned to nonuniversal behavior of the exponent t, or to saturation of the elastic response. On the other hand, the presented model accounts for all the main experimental features observed in these systems and for previously reported data of elastomer composites. The simulated behavior of the piezoresistivity coefficient is also in qualitative agreement with previous reports. © 2010 American Institute of Physics.
format Artículo
Artículo
publishedVersion
author Negri, R.M.
Rodriguez, S.D.
Bernik, D.L.
Molina, F.V.
Pilosof, A.
Perez, O.
author_facet Negri, R.M.
Rodriguez, S.D.
Bernik, D.L.
Molina, F.V.
Pilosof, A.
Perez, O.
author_sort Negri, R.M.
title A model for the dependence of the electrical conductance with the applied stress in insulating-conducting composites
title_short A model for the dependence of the electrical conductance with the applied stress in insulating-conducting composites
title_full A model for the dependence of the electrical conductance with the applied stress in insulating-conducting composites
title_fullStr A model for the dependence of the electrical conductance with the applied stress in insulating-conducting composites
title_full_unstemmed A model for the dependence of the electrical conductance with the applied stress in insulating-conducting composites
title_sort model for the dependence of the electrical conductance with the applied stress in insulating-conducting composites
publishDate 2010
url http://hdl.handle.net/20.500.12110/paper_00218979_v107_n11_p_Negri
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