Magnetic field-induced solvothermal synthesis of one-dimensional assemblies of Ni-Co alloy microstructures

Abstract

One-dimensional magnetic Ni Co alloy microwires with different microstructures and differently shaped building blocks including spherical particles, multilayer stacked alloy plates, and alloy flowers, have been synthesized by an external magnetic field-assisted solvothermal reaction of mixtures of cobalt(II) chloride and nickel(II) chloride in 1, 2-propanediol with different NaOH concentrations. By adjusting the experimental parameters, such as precursor concentration and Ni/Co ratio, Ni Co alloy chains with uniform diameters in the range 500 nm to 1.3 μm and lengths ranging from several micrometers to hundreds of micrometers can be obtained. A mechanism of formation of the one-dimensional assemblies of magnetic Ni Co microparticles in a weak external magnetic fi eld is proposed.

Fabrication of cobalt-nickel binary nanowires in a highly ordered alumina template via AC electrodeposition

“…It further verifies the suppression of cape formation over the top surface of Co-Ni binary nanowires. These results show that the most of the nanochannels of alumina are successfully filled with Co-Ni binary nanowires and have continuous morphology without any intermittence contrary to the chain-like CoNi alloy wires [29,32,33]. The formation of Co-Ni alloy nanowires has been confirmed using EDX.…”

High-frequency magnetic properties of FeNi3–SiO2 nanocomposite synthesized by a facile chemical method

“…Up to now, various methods have been developed to prepare magnetic alloy NPs and their nanocomposites [17][18][19][20]. However, most of them require rigorous conditions, such as high pressure, high temperature, inert atmosphere, vacuum, or H 2 atmosphere, which are inconvenient to operate in practice [25][26][27][28][29][30][31][32][33][34]. Recently, we reported a facile chemical method to synthesize FeNi 3 NPs in ambient air at low temperatures [35].…”

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

“…Magnetic-field-induced (MFI) assembly has been established as a powerful and versatile avenue to obtain one-dimensional (1D) structures. Despite these achievements, most of these researches were focused on morphology variation of aggregated elemental crystals and magnetic oxides from the point of view of assembly; the solution growth of binary alloys in the magnetic field is rarely reported [17,18]. Due to the difference of magnetic properties between two elements, the magnetic field is supposed to exert an effect on the microstructure and composition of the binary alloy during the synthesis process.…”