RT Journal Article
T1 Magnetic silica: epoxy composites with a nano- and micro-scale control
A1 Crespo Ribadeneyra, María
A1 González González, María
A1 Pozuelo de Diego, Javier
AB Multiscale composites with magnetic properties were prepared by incorporating Cu-Ni nanoferrites filled silica microparticles in an epoxy matrix. The size of the nanoferrites was controlled both by the structure of the silica template and the annealing temperature (700 and 900 °C) used during the synthesis procedure. The ferrite:silica particles prepared at 700 °C showed a narrow size distribution close to 8.3 nm with a superparamagnetic behaviour. A less symmetric size distribution was obtained when annealing was performed at 900 °C, with diameters ranging from 15 to 80 nm. The reinforcement incorporation increased up to 7 °C the glass transition temperature and 30 °C the decomposition temperatures of the composites. The proposed strategy permits the nanoscale control, by the trapping effect of the silica on the magnetic nanoparticles, as well as the control of the micro-scale distribution through a simple protocol. These composites could have potential applicability as EMI shielding materials, owing to their magnetic nature, lightweight and enhanced thermal stability.
PB Elsevier
SN 0254-0584
YR 2014
FD 2014-04-15
LK https://hdl.handle.net/10016/24476
UL https://hdl.handle.net/10016/24476
LA eng
NO This work was supported by Nacopan (MAT2007-31173-E) and Nanomod (MAT2010-17091) from the Spanish Ministerio de Ciencia e Innovación.
DS e-Archivo
RD 1 sept. 2024