A novel low-density (0.4-0.5 g/cm 3 ) hollow composite material with the superparamagnetic character has been synthesized by coating glass microballoons (GMBs) with magnetite (Fe 3 O 4 ) nanoparticles via chemical deposition process. The products were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersion X-ray spectroscopy (EDS) and vibrating sample magnetometer (VSM). A uniform and continuous Fe 3 O 4 -coating with thickness ca. 400-500 nm was obtain…
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