Low-Platinum-Content Exchange-Coupled CoPt Nanoalloys with Enhanced Magnetic Properties.

Bimetallic colloidal CoPt nanoalloys with low platinum content were successfully synthesized following a modified polyol approach. Powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and transmission electron microscopy (TEM) studies were performed to estimate the crystal structure, morphology, and surface functionalization of the colloids, respectively, while the room-temperature magnetic properties were measured using a vibrating sample magnetometer (VSM). The particles exhibit excellent uniformity, with a narrow size distribution, and display strong room-temperature hysteretic ferromagnetic behavior even in the as-made form.

LAPONITE® nanodisk-"decorated" FeO nanoparticles: a biocompatible nano-hybrid with ultrafast magnetic hyperthermia and MRI contrast agent ability.

Magnetic FeO nanoparticles "decorated" by LAPONITE® nanodisks have been materialized utilizing the Schikorr reaction following a facile approach and tested as mediators of heat for localized magnetic hyperthermia (MH) and as magnetic resonance imaging (MRI) agents. The synthetic protocol involves the interaction between two layered inorganic compounds, ferrous hydroxide, Fe(OH), and the synthetic smectite LAPONITE® clay Na[(SiMgLi)O(OH)], towards the formation of superparamagnetic FeO nanoparticles, which are well decorated by the diamagnetic clay nanodisks. The latter imparts high negative -potential values (up to -34.

Tuning Easy Magnetization Direction and Magnetostatic Interactions in High Aspect Ratio Nanowires.

Cobalt nanowires have been synthesized by electrochemical deposition using track-etched anodized aluminum oxide (AAO) templates. Nanowires with varying spacing-to-diameter ratios were prepared, and their magnetic properties were investigated. It is found that the nanowires' easy magnetization direction switches from parallel to perpendicular to the nanowire growth direction when the nanowire's spacing-to-diameter ratio is reduced below 0.

Mechanochemical Synthesis and Nitrogenation of the NdFeCoTi Alloy for Permanent Magnet.

In this work, the mechanochemical synthesis method was used for the first time to produce powders of the nanocrystalline NdFeCoTi compound from NdO, FeO, Co and TiO. High-energy-milled powders were heat treated at 1000 °C for 10 min to obtain the ThMn-type structure. Volume fraction of the 1:12 phase was found to be as high as 95.

Facile Organometallic Synthesis of Fe-Based Nanomaterials by Hot Injection Reaction.

Fe-based colloids with a core/shell structure consisting of metallic iron and iron oxide were synthesized by a facile hot injection reaction of iron pentacarbonyl in a multi-surfactant mixture. The size of the colloidal particles was affected by the reaction temperature and the results demonstrated that their stability against complete oxidation related to their size. The crystal structure and the morphology were identified by powder X-ray diffraction and transmission electron microscopy, while the magnetic properties were studied at room temperature with a vibrating sample magnetometer.