Superparamagnetic anisotropic elastomer connectors exhibiting reversible magneto-piezoresistivity
An anisotropic magnetorheological composite formed by dispersions of silver-covered magnetite microparticles (Fe3O4@Ag) in polydimethylsiloxane (PDMS) displaying electrical conduction only in one preferred direction is presented. A set-up for applying and detecting electrical conduction through the...
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todo:paper_09244247_v192_n_p34_Mietta2023-10-03T15:45:58Z Superparamagnetic anisotropic elastomer connectors exhibiting reversible magneto-piezoresistivity Mietta, J.L. Jorge, G. Perez, O.E. Maeder, T. Negri, R.M. Magnetoelastomers Magnetoresistivity Piezoresistivity Anisotropic elastomers Constant magnetic fields Constant pressures Contact points Elastic properties Electrical conduction Electrical conductivity I - V curve Low concentrations Magnetic force Magneto-rheological Magnetoelastomers Micro-particles Mullins effect Ohmic behavior Piezo-resistive Piezoresistance Piezoresistivity Polydimethylsiloxane PDMS Room temperature Superparamagnetic state Superparamagnetics Anisotropy Curing Electric conductivity Fillers Hysteresis Magnetoresistance Needles Silicones Superparamagnetism Magnetic fields An anisotropic magnetorheological composite formed by dispersions of silver-covered magnetite microparticles (Fe3O4@Ag) in polydimethylsiloxane (PDMS) displaying electrical conduction only in one preferred direction is presented. A set-up for applying and detecting electrical conduction through the composite is described and applied to characterize the behavior of the system in on-off commutation cycles. The composite is obtained by loading the polymer with relatively low concentration of fillers (5%, w/w of the total weight) and curing it in the presence of a uniform magnetic field. The fillers appear in the final composite as an array of needles, i.e. pseudo-chains of particles aligned in the direction of the magnetic field. Using Fe3O4 nanoparticles (13 nm) it is possible to obtain cured composites in a superparamagnetic state, that is, without magnetic hysteresis at room temperature. Hysteresis is not found in the elastic properties either; in particular, Mullins effects (change of physical properties after the first strain-stress cycle) were not observed. No measurable transversal electrical conduction was detected (transversal resistivity larger than 62 MΩ cm). Thus, significant electrical conductivity is present only between contact points that are exactly facing each other at both sides of the composites in the direction parallel to the needles. The I-V curves in that direction have ohmic behavior and exhibit both piezoresistance and magnetoresistance, that is, the electrical conductivity in the direction parallel to the pseudo-chains increases when a pressure (i.e. compressive stress) is applied at constant magnetic field and/or when a magnetic field is applied at constant pressure. The materials do not exhibit magnetoelectric or piezoresistive hysteresis. These characteristics illustrate the high potentiality of these systems in elastic connectors where electrical conduction can be varied by external mechanical or magnetic forces. © 2012 Elsevier B.V. Fil:Jorge, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Perez, O.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Negri, R.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09244247_v192_n_p34_Mietta |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Magnetoelastomers Magnetoresistivity Piezoresistivity Anisotropic elastomers Constant magnetic fields Constant pressures Contact points Elastic properties Electrical conduction Electrical conductivity I - V curve Low concentrations Magnetic force Magneto-rheological Magnetoelastomers Micro-particles Mullins effect Ohmic behavior Piezo-resistive Piezoresistance Piezoresistivity Polydimethylsiloxane PDMS Room temperature Superparamagnetic state Superparamagnetics Anisotropy Curing Electric conductivity Fillers Hysteresis Magnetoresistance Needles Silicones Superparamagnetism Magnetic fields |
| spellingShingle |
Magnetoelastomers Magnetoresistivity Piezoresistivity Anisotropic elastomers Constant magnetic fields Constant pressures Contact points Elastic properties Electrical conduction Electrical conductivity I - V curve Low concentrations Magnetic force Magneto-rheological Magnetoelastomers Micro-particles Mullins effect Ohmic behavior Piezo-resistive Piezoresistance Piezoresistivity Polydimethylsiloxane PDMS Room temperature Superparamagnetic state Superparamagnetics Anisotropy Curing Electric conductivity Fillers Hysteresis Magnetoresistance Needles Silicones Superparamagnetism Magnetic fields Mietta, J.L. Jorge, G. Perez, O.E. Maeder, T. Negri, R.M. Superparamagnetic anisotropic elastomer connectors exhibiting reversible magneto-piezoresistivity |
| topic_facet |
Magnetoelastomers Magnetoresistivity Piezoresistivity Anisotropic elastomers Constant magnetic fields Constant pressures Contact points Elastic properties Electrical conduction Electrical conductivity I - V curve Low concentrations Magnetic force Magneto-rheological Magnetoelastomers Micro-particles Mullins effect Ohmic behavior Piezo-resistive Piezoresistance Piezoresistivity Polydimethylsiloxane PDMS Room temperature Superparamagnetic state Superparamagnetics Anisotropy Curing Electric conductivity Fillers Hysteresis Magnetoresistance Needles Silicones Superparamagnetism Magnetic fields |
| description |
An anisotropic magnetorheological composite formed by dispersions of silver-covered magnetite microparticles (Fe3O4@Ag) in polydimethylsiloxane (PDMS) displaying electrical conduction only in one preferred direction is presented. A set-up for applying and detecting electrical conduction through the composite is described and applied to characterize the behavior of the system in on-off commutation cycles. The composite is obtained by loading the polymer with relatively low concentration of fillers (5%, w/w of the total weight) and curing it in the presence of a uniform magnetic field. The fillers appear in the final composite as an array of needles, i.e. pseudo-chains of particles aligned in the direction of the magnetic field. Using Fe3O4 nanoparticles (13 nm) it is possible to obtain cured composites in a superparamagnetic state, that is, without magnetic hysteresis at room temperature. Hysteresis is not found in the elastic properties either; in particular, Mullins effects (change of physical properties after the first strain-stress cycle) were not observed. No measurable transversal electrical conduction was detected (transversal resistivity larger than 62 MΩ cm). Thus, significant electrical conductivity is present only between contact points that are exactly facing each other at both sides of the composites in the direction parallel to the needles. The I-V curves in that direction have ohmic behavior and exhibit both piezoresistance and magnetoresistance, that is, the electrical conductivity in the direction parallel to the pseudo-chains increases when a pressure (i.e. compressive stress) is applied at constant magnetic field and/or when a magnetic field is applied at constant pressure. The materials do not exhibit magnetoelectric or piezoresistive hysteresis. These characteristics illustrate the high potentiality of these systems in elastic connectors where electrical conduction can be varied by external mechanical or magnetic forces. © 2012 Elsevier B.V. |
| format |
JOUR |
| author |
Mietta, J.L. Jorge, G. Perez, O.E. Maeder, T. Negri, R.M. |
| author_facet |
Mietta, J.L. Jorge, G. Perez, O.E. Maeder, T. Negri, R.M. |
| author_sort |
Mietta, J.L. |
| title |
Superparamagnetic anisotropic elastomer connectors exhibiting reversible magneto-piezoresistivity |
| title_short |
Superparamagnetic anisotropic elastomer connectors exhibiting reversible magneto-piezoresistivity |
| title_full |
Superparamagnetic anisotropic elastomer connectors exhibiting reversible magneto-piezoresistivity |
| title_fullStr |
Superparamagnetic anisotropic elastomer connectors exhibiting reversible magneto-piezoresistivity |
| title_full_unstemmed |
Superparamagnetic anisotropic elastomer connectors exhibiting reversible magneto-piezoresistivity |
| title_sort |
superparamagnetic anisotropic elastomer connectors exhibiting reversible magneto-piezoresistivity |
| url |
http://hdl.handle.net/20.500.12110/paper_09244247_v192_n_p34_Mietta |
| work_keys_str_mv |
AT miettajl superparamagneticanisotropicelastomerconnectorsexhibitingreversiblemagnetopiezoresistivity AT jorgeg superparamagneticanisotropicelastomerconnectorsexhibitingreversiblemagnetopiezoresistivity AT perezoe superparamagneticanisotropicelastomerconnectorsexhibitingreversiblemagnetopiezoresistivity AT maedert superparamagneticanisotropicelastomerconnectorsexhibitingreversiblemagnetopiezoresistivity AT negrirm superparamagneticanisotropicelastomerconnectorsexhibitingreversiblemagnetopiezoresistivity |
| _version_ |
1807318828550455296 |