Magnetic field-assisted solvothermal assembly of one-dimensional nanostructures of Ni–Co alloy nanoparticles

Effects of magnetic field on hydrothermal growth of Cu–Ni system

“…This phenomenon of increase in M s holds for other three parameters. The explanation of improved magnetic properties for samples S1m and S2m can be analogous to our previous reports of NiCo alloys and magnetite chainlike microstructures [17,22]. In the presence of the magnetic field, the diffusion rate Ni 2+ , and Cu 2+ in the solution is increased and this diffusion rate increase will favor the nucleation and growth of particles, improve the crystallinity and hence enhance the saturation magnetization.…”

“…Despite these achievements, most of these researches were focused on the changes of morphology and magnetic properties of the elemental crystal and magnetic oxide from the point of view of assembly. However, the solution growth of binary alloys in the magnetic field has rarely been reported [8,17]. Nanoscale metal and alloys have shown novel optical, electrical and magnetic properties with respect to their corresponding bulk materials.…”

Synthesis of nanocrystalline Co–Ni alloys by precursor approach and studies on their magnetic properties

“…Nanocrystalline magnetic alloys such as Ni-Cu, Co-Ni, Fe-Co and Fe-Co-Cu are promising candidates for hyperthermia and microwave applications because their magnetic transition temperatures and microwave absorbance characteristics vary with composition and grain size. In addition to the polyol reduction, many methods such as hydrogen and hydrothermal reduction [10][11][12][13], mechanical alloying [14], sonochemical method [15], thermal decomposition [16,17], sol-gel process [18,19], co-evaporation [20], microemulsion method [21,22], sequential ion implantation [23], electroless deposition [24], biomineralization [25] and magnetic field-assisted solvothermal process [26] have been reported in the literature for the synthesis of Co-Ni alloy nanoparticles. In the following section, the literature on the synthesis of Co-Ni nanoparticles by polyol reduction is reviewed.…”

Solvothermal and hydrothermal processes: the main physico-chemical factors involved and new trends

“…are able to improve the kinetics of solvothermal reactions of one or two orders of magnitude [118] or to induce a specific morphology of magnetic crystallites [119]. These associated technologies have been developed in particular for the preparation of well-defined nanocrystallites.…”

“…In parallel, several reaction mechanisms have also been investigated, such as the controlled reduction method [127], the fluorination process [128], the hot-press method [129], the resin-assisted synthesis [130], the synthesis under external magnetic field [119], and the interdiffusion process for the preparation of nanotubes [131].…”