The biocompatibility and anti-biofouling properties of magnetic core–multishell Fe@C NWs–AAO nanocomposites

Abstract

Soft-magnetic core-multishell Fe@C NWs-AAO nanocomposites were synthesized using anodization, electrodeposition and low-pressure chemical vapour deposition (CVD) at 900 °C. High chemical and mechanical stability is achieved by the conversion from amorphous to θ- and δ-Al2O3 phases above 600 °C. Moreover, the surface properties of the material evolve from bioactive, for porous AAO, to bioinert, for Fe@C NW filled AAO nanocomposite. Although the latter is not cytotoxic, cells do not adhere onto the surface of the magnetic nanocomposite, thus proving its anti-biofouling character.

Tunable High-Field Magnetization in Strongly Exchange-Coupled Freestanding Co/CoO Core/Shell Coaxial Nanowires

“…It is therefore unlikely that 100% single-phase hcp nanowires could be obtained by annealing. On the other hand, annealing at a high temperature could cause crystallization of the anodized alumina template, which would then prevent the subsequent chemical etching to release the nanowire . For these reasons, annealing treatments were not attempted in this work.…”

“…[15][16][17]36,38,[42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59] However, new effects could emerge if the exchange coupling is induced in such a way that it directly competes with the shape anisotropy.…”

“…Actually, the study of one dimensional (1D) structures (e.g., nanowires, nanorods, or nanotubes), has attracted ample attention during the last few years, not only from the basic [15][16][17]36,38,[42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59] The exchange coupling between the FM core and the AFM or FiM shell gives rise to phenomena similar to the ones observed in thin films and nanoparticles, e.g., loop shifts and coercivity enhancement. [15][16][17]36,38,[42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59] However, new effects could emerge if the exchange coupling is induced in such a way that it directly competes with the shape anisotropy.…”