INVESTIGADORES
D'ACCORSO Norma Beatriz
artículos
Título:
Structured Elastomeric Sub-millimeter Films Displaying Magneto and Piezo Resistivity
Autor/es:
MARIANO M. RUIZ; CLAUDIA M. MARCHI; OSCAR E. PEREZ; GUILLERMO E. JORGE; MIRTA FASCIO; NORMA D'ACCORSO; R. MARTIN NEGRI
Revista:
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
Editorial:
JOHN WILEY & SONS INC
Referencias:
Año: 2015 vol. 53 p. 574 - 586
ISSN:
0887-6266
Resumen:
Structured elastomer films (100-150 mm) presenting piezoresistive and magnetoresistance are described. The films are composites of particles, which are both electrically conductive and magnetic dispersed in an elastomeric matrix. The particles consist of magnetite (6nm) grouped in silver coated aggregates (Fe3O4@Ag). The matrix is SBR with diethylene glycol (DEG) is added. The particles, SBR and DEG are dispersed in toluene and placed between two rare earth magnets. Formation of pseudo-chains of inorganic material, aligned in the direction of the magnetic field between the magnets is obtained after solvent evaporation. The addition of DEG is substantial in order to obtain an electrical conductive material.The electrical conductivity increases when applying normal stresses and/or magnetic fields in the direction of the inorganic pseudo-chains; effects that are interpreted in terms of percolation between pseudo-chains. The elastomers, particles and pseudo-chains were characterized by XRD, SEM, EDS, FTIR, DSC, TGA, VSM, profilometry and stress-strain analysis.
