Freeze-Casting of Surface-Magnetized Iron(II,III) Oxide Particles in a Uniform Static Magnetic Field Generated by a Helmholtz Coil
ADVANCED ENGINEERING MATERIALS(2019)
摘要
Research is conducted into freeze-casting of surface-magnetized Fe3O4 particles under uniform, low-strength magnetic fields (5.2mT) to mimic the mechanical characteristics of natural human bone. Freeze-casting is a technique that fabricates porous materials by directionally freezing and sublimating an aqueous slurry. A novel, Helmholtz coil-based freeze-caster is developed and it is shown that, during freeze-casting, the use of this Helmholtz coil generates a more uniform magnetic field than permanent magnets. This uniform magnetic field, applied in the direction of ice growth, keeps particles from agglomerating and results in an increase of 55% in both the ultimate compressive strength and the elastic modulus of porous surface-magnetized Fe3O4 scaffolds. These increases can be linked to a reduction in the porosity that occurs due to magnetic interactions between particles in the presence of the field. These results offer a novel method for the fabrication of bone-inspired biomaterials and structural materials.
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关键词
bioinspired,freeze-casting,Helmholtz coil,porous material,surface-magnetized Fe3O4
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