The calcium phosphate particles can be used as building blocks for fabrication of 3D scaffolds intended for bone tissue engineering. This work presents for the first time a rapid creation of 3D scaffolds using magnetic levitation of calcium phosphate particles. Namely, tricalcium phosphate particles of equal size and certain porosity are used, which undergo the process of recrystallization after magnetic levitational assembly of the scaffold to ensure stitching of the scaffold. Label-free levitational assembly is achieved by using a custom-designed magnetic system in the presence of gadolinium salts, which allows the levitation of calcium phosphate particles. Chemical transformation of tricalcium-to octacalcium phosphate under the condition of magnetic levitation in non-homogeneous magnetic field is also demonstrated. This approach allows obtaining rapidly the octacalcium phosphate phase in the final 3D product, which is biocompatible.

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In this work, using the advantages of Fe and Co nitrates acting as nucleation sites, we polymerized acrylamide (AAm) complexes using frontal polymerization to obtain FeCo alloy/Ndoped carbon composites by converting its original precursor. The results of PAAm coating were found to be extremely useful in suppressing the collapse of the FeCo microstructure during pyrolysis, resulting in a unique hierarchical FeCo@CÀ N coreshell nanoparticle architecture encapsulated in PAAm-derived carbon nanocages. The thermal, mechanical and magnetic properties of the resulting FeCo/CÀ N filling polyethylene system have been investigated and presented.