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...
Guardado en:
| Autores principales: | , , , , , |
|---|---|
| Publicado: |
2010
|
| Materias: | |
| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00218979_v107_n11_p_Negri http://hdl.handle.net/20.500.12110/paper_00218979_v107_n11_p_Negri |
| Aporte de: |
| id |
paper:paper_00218979_v107_n11_p_Negri |
|---|---|
| record_format |
dspace |
| spelling |
paper:paper_00218979_v107_n11_p_Negri2023-06-08T14:42:46Z A model for the dependence of the electrical conductance with the applied stress in insulating-conducting composites Negri, Ricardo Martin Rodriguez, Silvio David Bernik, Delia Leticia Molina, Fernando Victor Pilosof, Ana María Renata Pérez, Oscar E. 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 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00218979_v107_n11_p_Negri 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) |
| 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, Ricardo Martin Rodriguez, Silvio David Bernik, Delia Leticia Molina, Fernando Victor Pilosof, Ana María Renata Pérez, Oscar E. 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. |
| author |
Negri, Ricardo Martin Rodriguez, Silvio David Bernik, Delia Leticia Molina, Fernando Victor Pilosof, Ana María Renata Pérez, Oscar E. |
| author_facet |
Negri, Ricardo Martin Rodriguez, Silvio David Bernik, Delia Leticia Molina, Fernando Victor Pilosof, Ana María Renata Pérez, Oscar E. |
| author_sort |
Negri, Ricardo Martin |
| 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 |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00218979_v107_n11_p_Negri http://hdl.handle.net/20.500.12110/paper_00218979_v107_n11_p_Negri |
| work_keys_str_mv |
AT negriricardomartin amodelforthedependenceoftheelectricalconductancewiththeappliedstressininsulatingconductingcomposites AT rodriguezsilviodavid amodelforthedependenceoftheelectricalconductancewiththeappliedstressininsulatingconductingcomposites AT bernikdelialeticia amodelforthedependenceoftheelectricalconductancewiththeappliedstressininsulatingconductingcomposites AT molinafernandovictor amodelforthedependenceoftheelectricalconductancewiththeappliedstressininsulatingconductingcomposites AT pilosofanamariarenata amodelforthedependenceoftheelectricalconductancewiththeappliedstressininsulatingconductingcomposites AT perezoscare amodelforthedependenceoftheelectricalconductancewiththeappliedstressininsulatingconductingcomposites AT negriricardomartin modelforthedependenceoftheelectricalconductancewiththeappliedstressininsulatingconductingcomposites AT rodriguezsilviodavid modelforthedependenceoftheelectricalconductancewiththeappliedstressininsulatingconductingcomposites AT bernikdelialeticia modelforthedependenceoftheelectricalconductancewiththeappliedstressininsulatingconductingcomposites AT molinafernandovictor modelforthedependenceoftheelectricalconductancewiththeappliedstressininsulatingconductingcomposites AT pilosofanamariarenata modelforthedependenceoftheelectricalconductancewiththeappliedstressininsulatingconductingcomposites AT perezoscare modelforthedependenceoftheelectricalconductancewiththeappliedstressininsulatingconductingcomposites |
| _version_ |
1768546613641347072 |