Synthesis and magnetic properties of nickel nanoparticles

Singh, Jaiveer; Patel, Tarachand; Kaurav, Netram; Okram, G. S.

doi:10.1063/1.4947690

Cited by 6 publications

(3 citation statements)

References 7 publications

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“…The SPM nature in Ni NP was observed also for the particles of size ∼4.2 nm at 32 K [26]. There are further reports on systems where the SPM behaviour of Ni NP is found in very smaller size (∼4 nm) particles with blocking temperature also at very low value (∼4.5 K) [27]. For NiO NPs, Duan et al [28] report that the T B increases from 19.8 to 161 K with the increase of particle size from 3.5 to 12.4 nm.…”

Section: Magnetic Characterizationmentioning

confidence: 58%

Large magnetoresistance in carbon-coated Ni/NiO nanoparticles

2018

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We report here a large magnetoresistance (MR) observed in carbon-coated Ni/NiO nanostructures synthesized by a chemical method. The crystalline nature and particle size of the graphitic-carbon-coated Ni/NiO nanostructure was investigated by X-ray diffraction study and field emission scanning electron microscope images. The Raman spectroscopy confirms the presence of graphite layer over the Ni/NiO nanostructure. The field-cooled (FC) magnetic hysteresis curves show exchange bias effect suggesting possible Ni/NiO core-shell structure. The temperature-dependent magnetization data show bifurcation in FC-zero-field-cooled curves, indicating the superparamagnetic behaviour and competing ferromagnetic (FM) and antiferromagnetic interactions in the nanocomposite. MR studies show a large negative MR of ∼20% at 18 K and ∼4.2% at room temperature, revealing significant enhancement of FM interactions at low temperatures and spin-dependent tunnelling of current through the nanocomposite.

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Section: Magnetic Characterizationmentioning

confidence: 58%

Large magnetoresistance in carbon-coated Ni/NiO nanoparticles

2018

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“…The single nickel peakobtained, rather than another nickel oxide phase, reflected the success of the reducing mechanism by inert nitrogen flow in a pyrolysis system to the nickel ion precursor obtained via the impregnation method. The inert heating system procedure was similar to the argon-atmosphere heating regarding the magnetic single nickel nanoparticles reported in previous work [ 22 , 23 , 24 ]. Furthermore, the crystallite size ( D ) of the dispersed Ni NPs was determined by using the Scherer Equation (Equation (1)):

where K is reflection constant, λ is wavelength of XRD light, β is full width and half maximum (FWHM) of the reflections, and θ is the reflection angle.…”

Section: Resultsmentioning

confidence: 99%

Nanocomposite of Nickel Nanoparticles-Impregnated Biochar from Palm Leaves as Highly Active and Magnetic Photocatalyst for Methyl Violet Photocatalytic Oxidation

et al. 2022

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Photocatalysis has been recognized as a feasible method in water and wastewater treatment. Compared to other methods such as adsorption and chemical oxidation, the use of photocatalyst in the advanced oxidation processes gives benefits such as a longer lifetime of the catalyst and less consumable chemicals. Currently, explorations into low-cost, effective photocatalysts for organic contaminated water are being developed. Within this scheme, an easily separated photocatalyst with other functionality, such as high adsorption, is important. In this research, preparation of a magnetic nanocomposite photocatalyst based on agricultural waste, palm leaves biochar impregnated nickel nanoparticles (Ni/BC), was investigated. The nanocomposite was prepared by direct pyrolysis of palm leaves impregnated with nickel (II) chloride precursor. Furthermore, the physicochemical characterization of the material was performed by using an X-ray diffractometer (XRD), scanning electron microscopy-energy dispersive X-ray fluorescence (SEM-EDX), transmission electron microscopy (TEM), gas sorption analysis, X-ray photoelectron spectroscopy (XPS) and vibrating sample magnetometer (VSM). The photocatalytic activity of Ni/BC was evaluated for methyl violet (MV) photocatalytic oxidation. The results from XRD, XPS and TEM analyses identified single nickel nanoparticles dispersed on the biochar structure ranging from 30–50 nm in size. The dispersed nickel nanoparticles increased the BET specific surface area of biochar from 3.92 m2/g to 74.12 m2/g oxidation. High photocatalytic activity of the Ni/BC was exhibited by complete MV removal in 30 min for the concentration ranging from 10–80 mg/L. In addition, the Ni/BC showed stability in the pH range of 4–10 and reusability without any activity change until fifth usage. The separable photocatalyst is related to magnetism of about 13.7 emu/g. The results highlighted the role of biochar as effective support for Ni as photoactive material.

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“…For NiNPs with the average diameter of 4 nm zero field cooled (ZFC) and field cooled (FC) magnetization versus temperature displayed magnetic interaction effect at approximately 5 K, indicating the super paramagnetic behavior. 48 Magnetic anisotropic constant was estimated to be 4.62•10 5 erg/cm 3 , and coercive field was 168 Oe at 3 K. 49 NiNPs were synthesized in a magnetic Ni phthalocyanine anions matrix based on intercalation between potassium atoms and Ni phthalocyanine (NiPc) at 573 K. It was found that K 2 NiPc had approximately 1 wt% of NiNPs with the average diameter of 15 nm and with fcc structure. The measured values of magnetization and absorption of ferromagnetic resonance considerably predominated the magnetism which could be attributed to pure NiNPs.…”

Section: Magnetic Properties Of Ni Nanoparticlesmentioning

confidence: 99%

Optimization of Epoxidation Palm-Based Oleic Acid to Produce Polyols

Jalil¹,

Rasnan²,

Yamin³

et al. 2022

ChChT

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Optimization of epoxidation by using response surface methodology (RSM) based on three-level three-factorial central composite design (CCD) was used. Response percentage of relative oxirane content (%RCO) was studied to determine the optimum reaction condition for production of polyols. The predicted value of model (85 %) was excellent in accordance to experimental value (81 %). All parameters (temperature, molar ratio of formic acid to oleic acid and molar ratio of hydrogen peroxide to oleic acid) were significant in influencing the course of epoxidation reaction (p < 0.05). The interaction between all parameters is also highly significant with p < 0.0001. Optimum reaction conditions obtained from RSM were as follows: the temperature 318 K, molar ratio of formic acid to oleic acid 1.64:1 and molar ratio of hydrogen peroxide to oleic acid 2:1. The epoxidation of palm oleic acid was carried out by using in situ performic acid. FTIR analysis showed the formation of epoxy functional groups at optimum reaction condition at the wavelength of 1340 cm-1. This epoxide group was used to produce polyols by using hydroxylation process and the polyols functional group was detected at the wavelength of 816 cm-1

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Synthesis and magnetic properties of nickel nanoparticles

Cited by 6 publications

References 7 publications

Large magnetoresistance in carbon-coated Ni/NiO nanoparticles

Large magnetoresistance in carbon-coated Ni/NiO nanoparticles

Nanocomposite of Nickel Nanoparticles-Impregnated Biochar from Palm Leaves as Highly Active and Magnetic Photocatalyst for Methyl Violet Photocatalytic Oxidation

Optimization of Epoxidation Palm-Based Oleic Acid to Produce Polyols

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