Mechanochemical Synthesis of Iron and Cobalt Magnetic Metal Nanoparticles and Iron/Calcium Oxide and Cobalt/Calcium Oxide Nanocomposites

Chaudhary, Varun; Zhong, Yucheng; Parmar, Harshida; Sharma, Vinay; Tan, Xiao; Ramanujan, R.V.

doi:10.1002/open.201800091

Cited by 21 publications

(13 citation statements)

References 84 publications

(140 reference statements)

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“…Mechanochemical synthesis is one of the fascinating synthetic approaches with notable simple, rapid, and reproducible properties . Besides, the method is also considered to overcome the problems related to the solution‐based chemistry processes .…”

Section: Introductionmentioning

confidence: 99%

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Mechanochemical Synthesis of γ‐Graphyne with Enhanced Lithium Storage Performance

Yang

et al. 2019

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γ‐Graphyne is a new nanostructured carbon material with large theoretical Li+ storage due to its unique large conjugate rings, which makes it a potential anode for high‐capacity lithium‐ion batteries (LIBs). In this work, γ‐graphyne‐based high‐capacity LIBs are demonstrated experimentally. γ‐Graphyne is synthesized through mechanochemical and calcination processes by using CaC2 and C6Br6. Brunauer–Emmett–Teller, atomic force microscopy, X‐ray photoelectron spectroscopy, solid‐state 13C NMR and Raman spectra are conducted to confirm its morphology and chemical structure. The sample presents 2D mesoporous structure and is exactly composed of sp and sp2‐hybridized carbon atoms as the γ‐graphyne structure. The electrode shows high Li+ storage (1104.5 mAh g−1 at 100 mA g−1) and rate capability (435.1 mAh g−1 at 5 A g−1). The capacity retention can be up to 948.6 (200 mA g−1 for 350 cycles) and 730.4 mAh g−1 (1 A g−1 for 600 cycles), respectively. These excellent electrochemical performances are ascribed to the mesoporous architecture, large conjugate rings, enlarged interplanar distance, and high structural integrity for fast Li+ diffusion and improved cycling stability in γ‐graphyne. This work provides an environmentally benign and cost‐effective mechanochemical method to synthesize γ‐graphyne and demonstrates its superior Li+ storage experimentally.

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Section: Introductionmentioning

confidence: 99%

“…For example, Turberg et al prepared 1,4‐diamino‐2‐butynes by using calcium carbide (CaC 2 ) as the acetylene source by the mechanochemical strategy . Mechanochemical method has been applied in metal–organic framework derived electrocatalysts and carbon materials …”

Section: Introductionmentioning

confidence: 99%

Mechanochemical Synthesis of γ‐Graphyne with Enhanced Lithium Storage Performance

Yang

et al. 2019

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“…The synthesis of the MgFe 2 O 4 nanocomposite in this study was based on previous literature methods 5 with mechanochemical modifications 13 . In this work, ball-milling mechanochemistry was performed using a hard small ball.…”

Section: Synthesis Of the Mgfe 2 O 4 And Mgfe 2 O 4 /Mgo Nanocompositesmentioning

confidence: 99%

“…6,12 Therefore, in this study, a nanocomposite was synthesized by impregnating MgFe 2 O 4 , which has acid sites, with MgO, which has basic sites, according to the previous studies 6 , with modifications based on mechanochemical methods. 13 In particular, ball-milling mechanochemistry was employed in this work as a simple and low-cost methodology. The synthesized products were characterized by FTIR, XRD, SEM-EDX and TEM.…”

Section: Introductionmentioning

confidence: 99%

SYNTHESIS OF MgFe2O4-MgO NANOCOMPOSITE: INFLUENCE OF MgO ON THE CATALYTIC ACTIVITY OF MAGNESIUM FERRITE IN BIODIESEL PRODUCTION

Helmiyati¹,

Abbas²,

Ramadhani³

2020

RJC

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A novel magnetic solid base catalyst consisting of an MgFe 2 O 4 -MgO nanocomposite was successfully prepared by synthesizing magnesium ferrite (MgFe 2 O 4 ) as the catalyst support, and it was employed in an esterification reaction for the production of biodiesel. MgFe 2 O 4 was synthesized by a ball-milling mechanochemical method at various furnace temperatures (350°C, 550°C and 750°C), and the best results were obtained at 750°C. The results of TEM revealed an average size of 39 nm. A nanocomposite of MgFe 2 O 4 -MgO was successfully synthesized in this study, as confirmed by Fourier transform infrared (FTIR), X-ray diffraction (XRD), scanning electron microscopy-energy dispersive x-ray (SEM-EDX) and transmission electron microscopy (TEM) characterization. The results of the FTIR characterization revealed peaks with wavenumbers corresponding to Mg-O and Fe-O bonds in the range of 500-900 cm -1 , SEM mapping showed that MgO was distributed on the surface of the MgFe 2 O 4 catalyst support, and the MgFe 2 O 4 -MgO average size was found to be 50 nm by TEM. The influence of MgO on MgFe 2 O 4 was determined by varying the molar ratio of MgFe 2 O 4 to MgO from 1: 1, 1: 2 and 1: 3 and by studying the catalytic activity in the esterification of oleic acid to biodiesel. The best MgFe 2 O 4 -MgO nanocomposite have a molar ratio of 1: 2 and gave a percent conversion of 96.089%. Impregnating MgFe 2 O 4 with MgO increased the number of basic active sites, thereby increasing the catalytic activity. This type of nanocomposite is a promising new material for future catalysts.

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“…In recent years, mechanochemistry emerged as a relevant methodology for the synthesis, preparation, and design of nanomaterials [36]. MgFe 2 O 4 and MgAl 2 O 4 spinels were previously synthesized via a mechanochemical method by other researchers, but, with low speed, lengthy, and energy intensive ball-milling conditions (e.g., over 12 h) [37,38].…”

Section: Introductionmentioning

confidence: 99%

Mechanochemical Synthesis of CuO/MgAl2O4 and MgFe2O4 Spinels for Vanillin Production from Isoeugenol and Vanillyl Alcohol

et al. 2019

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CuO/MgAl2O4 and CuO/MgFe2O4 catalysts were successfully synthesized with the use of spinel supports by a very simple and low-cost mechanochemical method. High-speed ball-milling was used to synthesize these catalyst supports for the first time. Materials were subsequently characterized by using XRD, FESEM, TEM, EDS-Dot mapping, XPS, BET-BJH, and Magnetic Susceptibility to investigate the physical-chemical characteristics of the catalysts. Acidity evaluation results indicated that the catalyst with the Mg-Al spinel support had more acid sites. XRD results showed a successful synthesis of the catalysts with large crystal sizes. Both catalysts were used in isoeugenol oxidation and vanillyl alcohol to vanillin reactions, with the CuO/MgAl2O4 showing optimum results. This catalyst provided 67% conversion (74% selectivity) after 2 h and this value improved to 81% (selectivity 100%) with the second reaction after 8 h. The CuO/MgFe2O4 catalyst in the first reaction after five hours revealed 53% conversion (47% selectivity) and after eight hours with the second reaction, the conversion value improved to 64% (100% selectivity). In terms of reusability, CuO/MgAl2O4 showed better results than the CuO/MgFe2O4 catalyst, for both reactions.

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Mechanochemical Synthesis of Iron and Cobalt Magnetic Metal Nanoparticles and Iron/Calcium Oxide and Cobalt/Calcium Oxide Nanocomposites

Cited by 21 publications

References 84 publications

Mechanochemical Synthesis of γ‐Graphyne with Enhanced Lithium Storage Performance

Mechanochemical Synthesis of γ‐Graphyne with Enhanced Lithium Storage Performance

SYNTHESIS OF MgFe2O4-MgO NANOCOMPOSITE: INFLUENCE OF MgO ON THE CATALYTIC ACTIVITY OF MAGNESIUM FERRITE IN BIODIESEL PRODUCTION

Mechanochemical Synthesis of CuO/MgAl2O4 and MgFe2O4 Spinels for Vanillin Production from Isoeugenol and Vanillyl Alcohol

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