Synthesis of carbon nanotubes by pyrolysis of solid Ni(dmg)2

Kordatos, Konstantinos; Vlasopoulos, A.D.; Strikos, S.; Ntziouni, Afroditi; Gavela, Stamatia; Trasobares, Susana; Kasselouri-Rigopoulou, V.

doi:10.1016/j.electacta.2008.07.080

Cited by 11 publications

(7 citation statements)

References 29 publications

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“…with a diameter of about 200 nm and a length of up to several micrometers (Ni et al, 2006;Kordatos et al, 2009), which is what was observed.…”

supporting

confidence: 65%

Dimethylglyoxime based ion-imprinted polymer for the determination of Ni(II) ions from aqueous samples

Rammika¹,

Darko²,

Tshentu³

et al. 2011

WSA

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A Ni(II)-dimethylglyoxime ion-imprinted polymer {Ni(II)-DMG IIP} was synthesised by the bulk polymerisation method. The morphology of the Ni(II)-DMG IIP and non-imprinted polymer were observed by scanning electron microscopy and the chemical structures were evaluated by infrared spectroscopy. Selectivity of the Ni(II)-DMG IIP was studied by analysing, using an inductively coupled plasma-optical emission spectrometer, for Ni(II) ions that were spiked with varying concentrations of Co(II), Cu(II), Zn(II), Pd(II), Fe(II), Ca(II), Mg(II), Na(I) and K(I) in aqueous samples. The studies revealed Ni(II) recoveries ranging from 93 to 100% in aqueous solutions with minimal interference from competing ions. Enrichment factors ranged from 2 to 18 with a binding capacity of 120 µg•g −1. Co(II) was the only ion found to slightly interfere with the determination of Ni(II). Selectivity studies confirmed that the Ni(II)-DMG IIP had very good selectivity, characterised by %RSD of less than 5%. The limits of detection and quantification were 3x10-4 µg•mℓ −1 and 9x10-4 µg•mℓ −1 , respectively. The accuracy of the method was validated by analysing a custom solution of certified reference material (SEP-3) and the concentration of Ni(II) obtained was in close agreement with the certified one. The Ni(II)-DMG IIP was successfully employed to trap Ni(II) ions from a matrix of sea, river and sewage water. It is believed that the Ni(II)-DMG IIP has potential to be used as sorbent material for pre-concentration of Ni(II) ions from aqueous solutions by solid-phase extraction.

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“…with a diameter of about 200 nm and a length of up to several micrometers (Ni et al, 2006;Kordatos et al, 2009), which is what was observed.…”

supporting

confidence: 65%

Dimethylglyoxime based ion-imprinted polymer for the determination of Ni(II) ions from aqueous samples

Rammika¹,

Darko²,

Tshentu³

et al. 2011

WSA

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“…Pressure experiments have shown that the M ... M interactions account also for the compressibility of these structures and the pressure-dependent changes of colour and electronic properties [3,4,8,12,[26][27][28][29][30][31]. These virtually insoluble metal ... metal stacked solids are the basis for applications of the three compounds [M(Hdmg) 2 ] (M = Pt, Pd, Ni) for the extraction or removal of these elements [32][33][34][35], as components of solid catalysts [36][37][38][39][40], as solid but easily evaporable precursors [37][38][39][40][41][42][43][44][45][46][47], and in optical devices (e.g., pressure calibrants/indicators) [3,4,12,[26][27][28][29][30][31][48][49][50][51].…”

Section: Introductionmentioning

confidence: 99%

DFT Investigation of the Molecular Properties of the Dimethylglyoximato Complexes [M(Hdmg)2] (M = Ni, Pd, Pt)

Niazi

Klein

2021

Inorganics

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Important applications of the NiII, PdII and PtII complexes [M(Hdmg)2] (H2dmg = dimethylglyoxime) stem from their metal...metal stacked virtually insoluble aggregates. Given the virtual insolubility of the materials, we postulated that the rare reports on dissolved species in solution do not represent monomolecular species but oligomers. We thus studied the structural and spectral properties of the monomolecular entities of these compounds using density functional theory (DFT) and time-dependent DFT computations in dimethyl sulfoxide (DMSO) as a solvent. The molecular geometries, IR and UV-vis spectra, and frontier orbitals properties were computed using LANL2DZ ecp and def2TZVP as basis sets and M06-2X as the functional. The results are compared with the available experimental and other calculated data. The optimised molecular geometries proved the asymmetric character of the two formed O–H…O bonds which connect the two Hdmg‒ ligands in the completely planar molecules. Calculated UV-vis spectra revealed the presence of three absorptions in the range 180 to 350 nm that are red-shifted along the series Ni–Pd–Pt. They were assigned to essentially ligand-centred π−π* transitions in part with metal(d) to ligand(π*) charge transfer (MLCT) contributions. The notorious d‒p transitions dominating the colour and electronics of the compounds in the solid-state and oligomeric stacks are negligible in our monomolecular models strongly supporting the idea that the previously reported spectroscopic observations or biological effects in solutions are not due to monomolecular complexes but rather to oligomeric dissolved species.

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“…2 The process is more easily controlled since the only significant parameter is the DMG/Ni 2+ molar ratio (P = 92.48%) whereas activator (P = 74.23%), the zinc/Ni 2+ molar ratio (P = 16.72%) and temperature (P = 5.88%) are significant parameters in traditional zinc cementation. 3 It is easy to recover nickel from the precipitation product since the bright red precipitate is Ni (DMG) 2 complex, an important precursor widely applied in the productions of nanostructured NiO (Kordatos et al, 2009;Ni et al, 2006Ni et al, , 2007Zagli and Falconer, 1982). By contrast, in the zinc cementation process, it is difficult because the cementation product is a mixture of metals, alloys of the metal and basic salts (Bøckman and Østvold, 2000b).…”

Section: No A(min) B(°c) C D Responses S/nsmentioning

confidence: 97%

“…Besides ZnO nanoparticles, in recent years, extensive researchers have proven that different kinds of nanostructured NiO, which have been synthesized via a thermal decomposition of Ni (DMG) 2 precursor, exhibit great electrochemical capacitance, antibacterial activities, and magnetic properties (Kordatos et al, 2009;Ni et al, 2006Ni et al, , 2007Pang et al, 2009;Poizot et al, 2000;Zhu et al, 2001). Nevertheless, in most of the processes described above, chemical reagents such as Zn (NO 3 ) 2 • 6H 2 O, ZnCl 2 , ZnSO 4 ·7H 2 O, NiCl 2 • 6H 2 O, NiSO 4 or Ni (OAc) 2 of AR grade were used to synthesize the precursors of ZnO nanoparticles or nanostructured NiO.…”

Section: Introductionmentioning

confidence: 99%

A hydrometallurgical route to produce ZnO nanoparticles and NiO strips from the spent Ni/ZnO catalyst

Liao

et al. 2012

Hydrometallurgy

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Synthesis of carbon nanotubes by pyrolysis of solid Ni(dmg)2

Cited by 11 publications

References 29 publications

Dimethylglyoxime based ion-imprinted polymer for the determination of Ni(II) ions from aqueous samples

Dimethylglyoxime based ion-imprinted polymer for the determination of Ni(II) ions from aqueous samples

DFT Investigation of the Molecular Properties of the Dimethylglyoximato Complexes [M(Hdmg)2] (M = Ni, Pd, Pt)

A hydrometallurgical route to produce ZnO nanoparticles and NiO strips from the spent Ni/ZnO catalyst

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