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Magnetic Properties and Dispersion Stability of Carbon Encapsulated Fe Nano Particles
엄영랑,이히민,김철성,이창규 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.61
Carbon-encapsulated Fe nanoparticles were synthesized by using levitational gas condensation (LGC). The morphologies of the carbon-coated Fe nanocrystallites were characterized by using transmission electron microscopy (TEM). All as-made materials were composed of nanocapsules with a uniform particle size at and below 10 nm. The nanocapsules consisted of outer carbon layers of multi-shell. M¨ossbauer spectroscopy revealed that the carbon-coated Fe nanoparticles were made of α-Fe, γ-FeC, and Fe3 C. The magnetization curves were measured at 60 and 300 K. The hysteresis loop demonstrated that the carbon-coated metal nanocrystallites exhibited a superparamagnetic behavior. The dispersion stability of the solvent increased in the following order: water, ethanol, and ethylene glycol. Flocculation due to a coalescing reaction between the nanoparticles was insignificant due to carbon layers on the surfaces of the nanoparticles.