Magnetoelectric CoFe₂O₄/polyvinylidene fluoride electrospun nanofibres

Abstract

Magnetoelectric 0-1 composites comprising CoFe2O4 (CFO) nanoparticles in a polyvinylidene fluoride (PVDF) polymer-fibre matrix have been prepared by electrospinning. The average diameter of the electrospun composite fibres is ∼325 nm, independent of the nanoparticle content, and the amount of the crystalline polar β phase is strongly enhanced when compared to pure PVDF polymer fibres. The piezoelectric response of these electroactive nanofibres is modified by an applied magnetic field, thus evidencing the magnetoelectric character of the CFO/PVDF 0-1 composites.

Processing and size range separation of pristine and magnetic poly( l -lactic acid) based microspheres for biomedical applications

“…In this way, the concentration of CoFe 2 O 4 nanoparticles in the spheres is lower than the one added to the composite solution, the loading efficiency being $40%, in good agreement with previous studies [16,44], one possible explanation for this effect is the higher density of the CoFe 2 O 4 nanoparticles when compared to the polymer matrix that might cause some sedimentation of nanoparticles in the solution during the microsphere formation. Further, it is to notice that the filler weight content within the microspheres is the same, independently of the sphere size, indicating a homogeneous distribution of the nanoparticles in the solution.…”

Advances in Magnetic Nanoparticles for Biomedical Applications

“…Most common are jetting methodologies such as aerodynamically assisted jetting/ threading, pressure‐assisted/driven jetting/spinning, laser‐guided writing, inkjet printing, electrospray, and electrospinning . Printing, electrospray, and electrospinning are currently undergoing a widespread revival of scientific investigation of chemical, physical, and biological outputs, being able to produce structures more similar in size to the natural extracellular matrix …”

“…This can be overcome by the application of a mechanical stimulation based on a biomagnetic approach (Figure c). Different strategies based on biomagnetic biomaterial were developed, such as films, hydrogels, fibers, and 3D scaffolds . The combination of magnetic particles with polymeric biomaterials has demonstrated large potential for disease treatment and tissue repair, namely bone, muscle, nerve and cardiac tissue regeneration with external magnetic stimulation.…”

Piezo- and Magnetoelectric Polymers as Biomaterials for Novel Tissue Engineering Strategies

“…Increasing the rotation speed of the collector from 500 to 2000 rpm, the fraction of β phase increases and may range between 50 to 85 % due to the higher stretching of the jet during the electrospinning process. Furthermore, the introduction of magnetostrictive nanoparticles into the polymeric PVDF solution allows the processing of magnetoelectric fibers with an average fiber diameter of ~325 nm [21]. According to [22], depending on solvent and electrospun processing parameters, it is possible to adjust the dominant crystalline phase producing fibers mainly containing α or trans-state (β or γ phases).…”