Structured Elastomeric Sub-millimeter SBR-DEG- Fe3O4@Ag Films Displaying Anisotropic Magneto and Piezo Resistivity?.

D´ACORSSO, N.; RUIZ, M.M.; MARCHI, M.C.; G. A. JORGE; FASCIO, M.; NEGRI RICARDO MARTÍN

Porto do Galinhas, Recife

Congreso; XII Ibero American Congress on Polymers and XIV SLAP; 2014

Structured Elastomeric Sub-millimeter SBR-DEG- Fe3O4@Ag Films Displaying Anisotropic Magneto and Piezo Resistivity. Norma D?Accorso1*, Mariano M. Ruiz2, Claudia M. Marchi2, Guillermo E. Jorge3, Mirta Fascio1, R.Martín Negri2. 1: CIHIDECAR-CONICET-UBA, Departamento de Química Orgánica. Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires. 2: Instituto de Química Física de Materiales, Ambiente y Energía (INQUIMAE). Departamento de Química Inorgánica, Analítica y Química Física. Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires 3: Instituto de Ciencias, Universidad Nacional de General Sarmiento, Argentina. On leave from Laboratorio de Bajas Temperaturas, Universidad de Buenos Aires, Argentina * e-mail: norma@qo.fcen.uba.ar. Abstract Anisotropic conductive Styrene-Butadiene Rubber (SBR) films were obtained by incorporating conductive particles and small amounts of diethyleneglycol (DEG) to the elastomer matrix. The conductive particles were prepared by reducing Ag(NH3)2+ with glucose on magnetic Fe3O4 nanoparticles (NPs), obtaining micrometric silver coated magnetite aggregates (Fe3O4@Ag) which present both magnetic and conductive properties. During the curing process of the films, an external magnetic field was applied, observing the formation of Fe3O4@Ag ?needles? each one working as an electrical conductive channel. The obtained films still have the elastic properties of the SBR matrix, even for 15% w/w on particles. Piezoresistivity and magnetoresistance properties were measured for the obtained films, showing that these materials have potential application to anisotropic stress and magnetic field sensors. Keywords: elastomers, magnetoresistance, piezoresistivity, nanoparticles, composites.