A model for the dependence of the electrical conductance with the applied stress in insulating-conducting composites
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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I28-R145-paper_00218979_v107_n11_p_Negri_oai2020-10-19 Negri, R.M. Rodriguez, S.D. Bernik, D.L. Molina, F.V. Pilosof, A. Perez, O. 2010 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. application/pdf http://hdl.handle.net/20.500.12110/paper_00218979_v107_n11_p_Negri info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar J Appl Phys 2010;107(11) 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 with the applied stress in insulating-conducting composites info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00218979_v107_n11_p_Negri_oai |
institution |
Universidad de Buenos Aires |
institution_str |
I-28 |
repository_str |
R-145 |
collection |
Repositorio Digital de la Universidad de Buenos Aires (UBA) |
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 http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00218979_v107_n11_p_Negri_oai |
work_keys_str_mv |
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