Superparamagnetic [sic] nanofibers by electrospinning
Ver/ Abrir
Impacto
Scholar |
Otros documentos de la autoría: Andersson, R. L.; Cabedo, Luis; Hedenqvist, M. S.; Olsson, R. T.; Ström, V.
Metadatos
Mostrar el registro completo del ítemcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/7034
comunitat-uji-handle3:10234/8619
comunitat-uji-handle4:
INVESTIGACIONMetadatos
Título
Superparamagnetic [sic] nanofibers by electrospinningFecha de publicación
2016Editor
Royal Society of ChemistryISSN
20462069Cita bibliográfica
ANDERSSON, R. L., et al. Superparamagnetic [sic] nanofibers by electrospinning. RSC Advances, 2016, vol. 6, no 26, p. 21413-21422Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
http://pubs.rsc.org/en/content/articlehtml/2016/ra/c5ra27791dPalabras clave / Materias
Coercive force | Electrospinning | Fibers | Magnetic materials | Magnetic susceptibility | Magnetization | Nanoparticles | Particle size | Spinning (fibers) | Superparamagnetism | Ac-susceptibility measurements | High magnetization | Magnetic characterization | Microscopy technique | Particle concentrations | Strong interaction | Superparamagnetics | Theoretical values | Saturation magnetization
Resumen
The preparation of superparamagnetic thin fibers by electrospinning dispersions of nanosized magnetite (Fe3O4, SPIO/USPIO) in a PMMA/PEO polymer solution is reported. The saturation magnetization and coercivity were ... [+]
The preparation of superparamagnetic thin fibers by electrospinning dispersions of nanosized magnetite (Fe3O4, SPIO/USPIO) in a PMMA/PEO polymer solution is reported. The saturation magnetization and coercivity were not affected by the concentration (0, 1, 10, 20 wt%) or fiber orientation, showing hysteresis loops with high magnetization (64 A m2 kg-1 @ 500 kA m-1) and record low coercivity (20 A m-1). AC susceptibility measurements vs. temperature at frequencies from 60 to 2 kHz confirmed superparamagnetism. The mechanical properties were only slightly dependent on the particle concentration because the nanoparticles were separately encapsulated by the polymer. A uniform fibre fracture cross section was found at all the investigated particle contents, which suggests a strong interaction at the polymer/particle interface. A theoretical value of the magnetic low field susceptibility was calculated from the Langevin function and compared with measured values. The results show a distinct but concentration-independent anisotropy, favoring magnetization along the fiber orientation with no sign of exchange interaction, explained by complete nanoparticle separation. Superparamagnetism cannot be inferred from particle size alone, so a relevant interpretation and criterion for superparamagnetism is presented, in accordance with Neel's original definition. From the measurements, it can be concluded that magnetic characterization can be used to elucidate the material morphology beyond the resolution of available microscopy techniques (TEM and SEM). © 2016 The Royal Society of Chemistry. [-]
Publicado en
RSC Advances, 2016, vol. 6, no 26Derechos de acceso
http://rightsstatements.org/vocab/InC/1.0/
info:eu-repo/semantics/openAccess
info:eu-repo/semantics/openAccess
Aparece en las colecciones
- ESID_Articles [474]
Ítems relacionados
Mostrando ítems relacionados por Título, autoría o Palabra clave.
-
Magnetic Field as a Characterization of Wide and Narrow Spaces in a Real Challenging Scenario Using Dynamic Time Warping
Perez-Navarro, Antoni; Montoliu Colás, Raul; Torres-Sospedra, Joaquín; Conesa, Jordi Institute of Electrical and Electronics Engineers (2018-11-15)This paper presents a study of indoor positioning in public zones of the Parc Taulí Hospital in Sabadell. It is a challenging scenario because: (1) it combines wide spaces with middle sized and narrow spaces; (2) it is a ... -
Magnetic modulation of the tunneling between defects states in antidot superlattices
Movilla, Jose L.; Planelles, Josep IOP Publishing (2012)We show theoretically that the tunnelling between properly designed defects in periodic antidot lattices can be strongly modulated by applied magnetic fields. Further, transport channels made up of linear arrangements of ... -
Providing Databases for Different Indoor Positioning Technologies: Pros and Cons of Magnetic Field and Wi-Fi Based Positioning
Torres-Sospedra, Joaquín; Montoliu Colás, Raul; Mendoza-Silva, Germán Martín; Belmonte-Fernández, Óscar; Rambla Risueño, David; Huerta, Joaquin Hindawi Publishing Corporation (2016)Localization is one of the main pillars for indoor services. However, it is still very difficult for the mobile sensing community to compare state-of-the-art indoor positioning systems due to the scarcity of publicly ...