Synthesis and magnetic properties of nickel micro urchins

Tontini, Gustavo; Koch, Amanda Manes; Schmachtenberg, Victor Alexandre Veit; Binder, Cristiano; Klein, Aloı́sio Nelmo; Drago, Valderes

doi:10.1016/j.materresbull.2014.10.029

Cited by 5 publications

(4 citation statements)

References 13 publications

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“…[11][12][13][14][15][16] Up to now, many kinds of morphological nickel particles, such as spheres, fibers, flower and urchin-like particles have been constructed via different strategies. [17][18][19][20][21] In these above methods, various reductants, solvents and surfactants were used during hydrothermal, thermal decomposition and microwave-assisted processes. In most cases, the dependence of the nickel morphology on different factors has been investigated based on tuning the concentration of the reactants, pH value, ratio of two solvents and temperature.…”

Section: Introductionmentioning

confidence: 99%

Manipulating the nickel shape and catalytic performance: from spheres to chains to urchins

et al. 2015

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Different nickel particle morphologies, including spheres, chains and urchins, were achieved in ethylene glycol solvent upon simply tuning both the amount of water and NaOH. The synthesis route was based on a routine solvothermal technique, in which nickel chloride and hydrazine hydrate were the nickel source and reductant, respectively. The shape transformation might be induced by an accelerated reaction rate and a change of the polarity of the solvent. Owing to the various morphology, these three kinds of nickel particles presented different catalytic performance. The reduction of 4-nitrophenol by NaBH 4 as a typical catalytic model revealed that the urchin-like nickel particles behaved with the highest catalytic effect because of their unique structure with tips on the surface, which endowed much more active sites for the catalytic reaction. The good magnetic properties allowed these nickel particles to be readily recycled after application and they presented a much high cycling stability.

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Section: Introductionmentioning

confidence: 99%

Manipulating the nickel shape and catalytic performance: from spheres to chains to urchins

et al. 2015

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“…Figure 2a displays the pattern of L-CIL(Pro)-C as an amorphous carbon structure such as C Carbon, C graphite [27,28] or theoretical graphite [29], as reported in the literature. The peaks at 2θ = 44.50 and 76.41 shown in Figure 2a (red line) correspond well with the two most intense peaks, (1,1,1) and (2,2,0), respectively, of face-centered cubic metallic Ni surface [29][30][31]. some general characterization of the material as follows, to verify that we obtained a carbon material.…”

Section: Resultsmentioning

confidence: 94%

“…Next, we used X-ray diffraction (XRD) patterns to explore the structure of the carbonaceous CIL(Pro)-C layers formed on the Ni foil surfaces. Figure 2 a displays the pattern of L-CIL(Pro)-C as an amorphous carbon structure such as C Carbon, C graphite [ 27 , 28 ] or theoretical graphite [ 29 ], as reported in the literature. The peaks at 2θ = 44.50 and 76.41 shown in Figure 2 a (red line) correspond well with the two most intense peaks, (1,1,1) and (2,2,0), respectively, of face-centered cubic metallic Ni surface [ 29 , 30 , 31 ].…”

Section: Resultsmentioning

confidence: 99%

Chiral Porous Carbon Surfaces for Enantiospecific Synthesis

2022

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Chiral surfaces, developed in the last decade, serve as media for enantioselective chemical reactions. Until today, they have been based mostly on developments in silica templating, and are made mainly from imprints of silicate materials developed a long time ago. Here, a chiral porous activated carbon surface was developed based on a chiral ionic liquid, and the surface chemistry and pore structure were studied to lay a new course of action in the field. The enantioselectivities of surfaces are examined by using variety of methods such as circular dichroism, linear sweep voltammetry and catalysis. These techniques revealed a 28.1% preference for the D enantiomer of the amino acid proline, and linear sweep voltammetry confirmed chirality recognition by another probe. An aldol surface chiral catalytic reaction was devised and allowed to determine the root of the enantiomeric excess. These results affirm the path toward a new type of chiral surface.

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“…[14] demonstrated the formation of nickel nanostructures via chemical reduction employing hydrazine and ethylene glycol as the reducing and stabilising agents, respectively. And very recently, Tontini et al [15] reported the synthesis of temperature-controlled loose nickel micro-urchins using a chemical reduction route. From the present literature perspective, it is clear that the development of a feasible synthetic method for NPs is important to support their use in various practical applications.…”

Section: Introductionmentioning

confidence: 99%

Microwave-assisted synthesis of L-cysteine-capped nickel nanoparticles for catalytic reduction of 4-nitrophenol

et al. 2015

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A simple and efficient microwave-assisted procedure for synthesis of L-cysteine-capped nickel nanoparticles (cyst-Ni NPs) in ethylene glycol solvent was demonstrated. The as-synthesised NPs were characterised by ultraviolet-visible (UV-Vis) spectrophotometer, Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM) and X-ray diffractometry (XRD). The cyst-Ni NPs are proved to be excellent heterogeneous catalysts for the 100 % reduction of 4-nitrophenol (4-NPh) in the presence of reductant (NaBH 4 ) within reaction time of 40 s. In contrast, Raney nickel in similar sample environments shows only 25.5 % reduction. The kinetic and energetic behaviours of cyst-Ni NPs were also studied, and the reduction reaction is determined to follow pseudo-first-order kinetics with a rate constant value of 0.115 s -1 and activation energy of 36.1 kJÁmol -1 . In addition to its high catalytic competence, cyst-Ni NPs catalyst exhibits excellent recyclability with negligible catalytic poisoning.

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Synthesis and magnetic properties of nickel micro urchins

Cited by 5 publications

References 13 publications

Manipulating the nickel shape and catalytic performance: from spheres to chains to urchins

Manipulating the nickel shape and catalytic performance: from spheres to chains to urchins

Chiral Porous Carbon Surfaces for Enantiospecific Synthesis

Microwave-assisted synthesis of L-cysteine-capped nickel nanoparticles for catalytic reduction of 4-nitrophenol

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