Room Temperature Synthesis of Highly Magnetic Cobalt Nanoparticles by Continuous Flow in a Microfluidic Reactor

Experimental evidence for the formation of CoFe2C phase with colossal magnetocrystalline-anisotropy

“…The data revealed blocking temperature, T B , at H C0 to be 790 K and the coercivity at 0 K to be 1.3 kOe. From those results, the effective magnetocrystalline anisotropy K eff and the magnetic domain size was determined using the Neel Brown equation 11 and the initial slopes of the M versus H curves 12,13 to be 4.6 6 2 Â 10 6 J/m 3 and 5 6 1 nm, respectively. We also analyse the experimental data of the coercivity dependence on the temperature using Sharrock's formula.…”

Synthesis of FeCo alloy magnetically aligned linear chains by the polyol process: structural and magnetic characterization

“…Similar studies on non-Fe containing Co nanoparticles also indicate a ferromagnetic response at these temperatures. 17 Fig. 9 displays the mass susceptibility versus temperature (K) of the as-synthesized FeCo MALCs.…”

“…3 Therefore, investigating the magnetic properties of FeCo alloys, specifically at nanoscopic and mesoscopic dimensions, is of current interest. When high aspect ratios (10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) are achieved as in the case of Ni nanowires (NWs) or nanopillars, a decrease in T C (Curie point) has been observed at diameters below 90 nm. 4 Nanoscale ferromagnetic materials such as Co NW arrays have shown an increase in H c up to 4.8 kOe when the applied magnetic field was along the easy axis of hcp-Co. 5 In contrast, low H c values are routinely achieved in ferromagnetic alloys of FeCo due to larger dimensions and or annealing treatments that reduce internal strain and defects within the microstructure.…”

Surfactant assisted reactive crystallization of cobalt oxide nanoparticles in a tubular microreactor: effects of precursor concentrations and type of surfactants

“…To the best of the authors' knowledge, although numerous reports are available for the synthesis of other metal oxide nanoparticles, the continuous synthesis of CoO nanoparticles using a microreactor has been less explored. 30,31 The effects of precursor concentration, initial molar ratios of reactants and surfactant type on particle size distributions of the synthesized CoO nanoparticles were investigated.…”