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Abstract:

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.

Registro:

Documento: Artículo
Título:A model for the dependence of the electrical conductance with the applied stress in insulating-conducting composites
Autor:Negri, R.M.; Rodriguez, S.D.; Bernik, D.L.; Molina, F.V.; Pilosof, A.; Perez, O.
Filiación:Departamento de Química Inorgánica, Instituto de Química Física de Materiales, Ambiente y Energía (INQUIMAE), Universidad de Buenos Aires, C1428EGA, Buenos Aires, Argentina
Departamento de Industrias, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, C1428EGA, Buenos Aires, Argentina
Ciudad Universitaria, Pabellón II, INQUIMAE, C1428EGA, Buenos Aires, Argentina
Palabras clave: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
Año:2010
Volumen:107
Número:11
DOI: http://dx.doi.org/10.1063/1.3410799
Título revista:Journal of Applied Physics
Título revista abreviado:J Appl Phys
ISSN:00218979
CODEN:JAPIA
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_00218979_v107_n11_p_Negri.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00218979_v107_n11_p_Negri

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Citas:

---------- APA ----------
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 with the applied stress in insulating-conducting composites. Journal of Applied Physics, 107(11).
http://dx.doi.org/10.1063/1.3410799
---------- CHICAGO ----------
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" . Journal of Applied Physics 107, no. 11 (2010).
http://dx.doi.org/10.1063/1.3410799
---------- MLA ----------
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" . Journal of Applied Physics, vol. 107, no. 11, 2010.
http://dx.doi.org/10.1063/1.3410799
---------- VANCOUVER ----------
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. J Appl Phys. 2010;107(11).
http://dx.doi.org/10.1063/1.3410799