Novel hybrid multifunctional magnetoelectric porous composite films

Synthesis of CoFe2O4 nanocubes

“…In addition, these materials also have interesting catalytic and photocatalytic activity in various reactions, for applications in the field of water treatment [12][13] and gas sensing [14][15]. Creating composite materials based on CoFe2O4 nanoparticles can lead to new functional membranes; CoFe2O4 magnetostrictive nanoparticles were included in piezolectric polymers or dispersed in self-assembly of cellulose nanowhiskers in order to obtain magnetoelectric membranes [16][17]. Tuning the size, shape and composition of ferrite nanoparticles allows to tune their properties.…”

Magnetically Controlled Drug Release System through Magnetomechanical Actuation

“…Figure d shows that the incorporation of the magnetostrictive TD particles do not affect the membrane microstructure or its biocompatibility (see the Supporting Information), resulting in an average pore diameter of ≈60 µm and 96% porosity, allowing the obtention of a release membrane magnetically controlled . Additionally, the drug release has no influence on the morphology of the membranes (see the Supporting Information).…”

“…It is also observed that the preparation method leads to a good dispersion of the magnetic particles into the membrane (inset of Figure d). Finally, as observed in related magnetic composite membranes, some of the nanoparticles are within the polymer matrix and others are coating the surface of the pores.…”

“…“Active” membranes can be also achieved with the incorporation of magnetic nanoparticles and, in particular, magnetostrictive ones (in which the strain varies as a quadratic function of the applied magnetic field), allowing actuation under a magnetic field . In those composites, the deformation of the polymer membrane resulting from the nanoparticle magnetostriction causes a pressure‐triggered release of the drug through the pores, which results in triggered and/or controlled drug delivery …”

Strain-gradient effects in nanoscale-engineered magnetoelectric materials

“…Mesoporous and nanoporous materials have recently attracted much attention for the fabrication of ME composites due to their ability to accommodate various guest materials. [42][43][44] It is worth mentioning that the vast majority of works deal with CME, where the changes in magnetic properties of the porous matrix are governed by electric surface charge accumulation or interface oxidationreduction reactions. 3,18 Indeed, in these cases, the presence of pores brings about a drastic increase in the surface-to-volume ratio that significantly enhances ME effects.…”