Surfactant‐Assisted Synthesis and Characterization of Novel Chain‐Like CoNi Alloy Assemblies

Abstract

Novel chain-like CoNi alloy assemblies with a length of up to 6-7 µm were successfully prepared by a surfactant-assisted hydrothermal synthetic route at 100°C for 2 h. The individual submicrospheres built from smaller CoNi nanoparticles had a diameter of about 400-500 nm. These microspheres were then integrated to form the novel chain-like CoNi alloy assemblies. The effects of synthetic parameters such as surfactant and solvent on the formation and morphology of CoNi samples were investigated. The experimental results showed that N 2 H 4 ·H 2 O and CTA + play important roles in the formation of the novel chain-like CoNi alloy assemblies. Based on

Microwave-assisted synthesis and magnetic properties of size-controlled CoNi/MWCNT nanocomposites

“…And there were no observable peaks in the XRD spectra corresponding to those of pure cobalt and nickel, so the homogeneous solid solution of CoNi should have been formed. These facts confirm that Co and Ni formed an alloy, rather than separate grains [16]. The average crystallite size for different atomic ratios (3, 7, 12, and 18 at%) of CoNi/MWCNTs, calculated using the Debye-Scherrer formula based on the full width at half-maximum of the (1 1 1) diffraction peak, was 12.1, 21.2, 36.9, and 42.5 nm, respectively.…”

“…For example, magnetic recording density is remarkably enhanced as the size of magnetic particles decreases. CoNi alloy nanoparticles with different shapes and sizes have been prepared such as nanowires [13,14], bracelet-like [15], chain-like [16], handkerchief-like [6], and film [3,17], etc.…”

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

“…Micro-and nanoscale Ni Co alloy structures have been prepared by many methods, including electrochemical reduction [19,20], mechanical alloying [21], leaching techniques [22], sol gel routes [23], thermal decomposition of organometallic precursors [24], polyol reduction [25,26], and reduction of metal salts by other strong reducing agents [27,28]. Recently, several groups have reported the synthesis of one-dimensional Ni Co 304 Nano Res (2008) 1: 303 313 Nano Research nanomaterials.…”

“…Recently, several groups have reported the synthesis of one-dimensional Ni Co 304 Nano Res (2008) 1: 303 313 Nano Research nanomaterials. For example, Ni Co alloy nanowire arrays were prepared by co-electrodepositing Co(II) and Ni(II) into the pores of porous anodic aluminum oxide templates [29], Ni Co needle-like alloys were synthesized in water-in-oil microemulsions [30], hexagonal Ni Co nanowires were synthesized by heterogeneous nucleation in liquid polyols [25,26] and chain-like Ni Co alloys were synthesized by reduction of Co(II) and Ni(II) using hydrazine hydrate with the assistance of a surfactant [28]. However, all the above-mentioned synthetic methods require the use of either hard templates or surfactants or involve multiple steps.…”