Spectroscopic studies and antibacterial activities of pure and various levels of Cu-doped BaSO4 nanoparticles

Sivakumar, S.; Soundhirarajan, P.; Arul, Venkatesan; Khatiwada, Chandra Prasad

doi:10.1016/j.saa.2015.07.048

Cited by 16 publications

(6 citation statements)

References 37 publications

(33 reference statements)

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“…The peaks are largely identical to those of the reported barium sulfate (Figure S4B). 67 The XPS results after the sulfur leaching process support this observation with the disappeared peaks at 160−165 eV in the S 2p region (Figure 3D) and the emerged peak at ∼531.0 eV in the O 1s region of NiS 2 /Ni 3 S 4 , indicating sulfur leaching and the formation of nickel(oxy)hydroxide. In addition, the HAADF images, as well as the corresponding elemental mappings present higher atomic ratios for nickel in the structure and lower ones for sulfur: The activity enhancement of NiS 2 /Ni 3 S 4 obtained by the reaction time of 4 h after sulfur leaching prompted us to investigate whether further improvement in activity was possible when changing the reaction time to 2 or 6 h. The Ni−S-2 h and Ni−S-6 h show an increase in performance after sulfur leaching but are less active than the 4 h reaction (Figure S2).…”

Section: Resultssupporting

confidence: 55%

“…The peaks are largely identical to those of the reported barium sulfate (Figure S4B). The XPS results after the sulfur leaching process support this observation with the disappeared peaks at 160–165 eV in the S 2p region (Figure D) and the emerged peak at ∼531.0 eV in the O 1s region of NiS 2 /Ni 3 S 4 , indicating sulfur leaching and the formation of nickel(oxy)hydroxide. In addition, the HAADF images, as well as the corresponding elemental mappings present higher atomic ratios for nickel in the structure and lower ones for sulfur: Ni 93 S 7 (Figure S4C–E), further supporting the leaching of sulfur from NiS 2 /Ni 3 S 4 .…”

Section: Resultssupporting

confidence: 53%

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Multistep Sulfur Leaching for the Development of a Highly Efficient and Stable NiS_x/Ni(OH)₂/NiOOH Electrocatalyst for Anion Exchange Membrane Water Electrolysis

Jiang

Hartmann

et al. 2022

ACS Appl. Mater. Interfaces

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Nickel (poly)sulfides have been widely studied as anodic catalysts for alkaline water electrolysis owing to their diverse morphologies, high catalytic activities in the oxygen evolution reaction (OER), and low cost. To utilize low-cost and high-efficiency polysulfides with industry-relevant cycling stability, we develop a Ni-rich NiS x /Ni(OH)2/NiOOH catalyst derived from NiS2/Ni3S4 nanocubes. Ni-rich NiS x /Ni(OH)2/NiOOH shows improved OER catalytic activity (η = 374 mV@50 mA cm–2) and stability (0.1% voltage increase) after 65 h of a galvanostatic test at 10 mA cm–2 compared with commercial Ni/NiO and hydrothermally synthesized Ni(OH)2 (both show η > 460 mV@50 mA cm–2 along with 4.40 and 1.92% voltage increase, respectively). A water-splitting electrolyzer based on Pt/C||AF1-HNN8-50||NiS x /Ni(OH)2/NiOOH exhibits a current density of 1800 mA cm–2 at 2.0 V and 500 h high-rate stability at 1000 mA cm–2 with negligible attenuation of only 0.12 mV h–1. This work provides an understanding of truly stable species, intrinsic active phases of Ni polysulfides, their high-rate stability in a real cell, and sheds light on the development of stable chalcogenide-based anodic electrocatalysts for anion exchange membrane water electrolysis (AEMWE).

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Section: Resultssupporting

confidence: 55%

Section: Resultssupporting

confidence: 53%

Multistep Sulfur Leaching for the Development of a Highly Efficient and Stable NiS_x/Ni(OH)₂/NiOOH Electrocatalyst for Anion Exchange Membrane Water Electrolysis

Jiang

Hartmann

et al. 2022

ACS Appl. Mater. Interfaces

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“…The X-ray diff raction study was used to identify the crystal structure and determine the particle size. All the refl ection plains are matched with an orthorhombic phase of barium sulphate [10][11][12], with crystalline cell constants a  7.144, b  8.865 and c  5.445A˚, which are basically in agreement with the reported values (JCPDS Card Files No. 80-0512), space group Pnma.…”

Section: Fig 2 Granulometric Curvessupporting

confidence: 87%

Mineralogical and granulo-chemical characterization of veins 4 and 10, of Ain Mimoun baryte ore mine

Baladah¹,

Chettibi²,

Boutrid³

et al. 2022

Nauk. visn. nat. hirn. univ.

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Purpose. The purpose of the carried out granulo-chemical and mineralogical study, realised on barite of two veins 4 and 10 of Ain Mimoun deposit (Algeria), is the identification of the barite ore in order to be able to choose a reliable processing method due to its complicated structure. Methodology. The investigation was carried out by X-Ray Diffractions (XRD), Scanning Electron Microscope (SEM), X-Ray Fluorescence (XRF), particle size analysis and microscopic observations. Findings. Using the investigation devices, predominance of barite minerals was found at 51%, quartz in the vicinity of 34% and calcite at 9%, with a homogeneous distribution in all the fractions observed. Adding to that, the main compounds (oxides) present are SiO2, CaO, Fe2O3, Al2O3, P2O5, Na2O, K2O, TiO2, and MnO. Originality. For the first time the characterization of veins 4 and 10, in which the barite particles are embedded in silica, has been realised for the purpose of proving the possibility of their processing. Practical value. The obtained results confirm, on the one hand, that veins 4 and 10 are rich in barite and, on the other hand, barite particle release from silica particles is possible. Thus, we suggest, for a better and diversified use of the ore of the veins in question, the application of the flotation process, since the latter makes it possible to obtain high-quality concentrates, so it can be used not only in the petroleum field but also in the pharmaceutical and other industries.

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“…Figure a illustrates ATR-FTIR spectra of BraM-C bulk material and the tribofilm formed on the steel surface rubbed at 30 MPa with BraM-C. As seen from the spectrum of the tribofilm, the absorption peaks at 1186 and 610 cm –1 (S–O), 1615 and 1441 cm –1 (Mg–O), and 991 cm –1 (Si–O) indicate presence of wear products of BaSO 4 and Mg 3 Si 4 O 10 (OH) 2 . − Moreover, Fe 3 O 4 generated due to tribooxidation of the steel is clearly identified with an absorption peak at 580 cm –1 (Fe–O) Figure b gives ATR-FTIR spectra of BraM-3Zr bulk material and the tribofilm formed on the steel surface rubbed with BraM-3Zr.…”

Section: Results and Discussionmentioning

confidence: 97%

Switching Brake Materials To Extremely Wear-Resistant Self-Lubrication Materials via Tuning Interface Nanostructures

Che

Zhang

et al. 2018

ACS Appl. Mater. Interfaces

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Tribological performance of motion components is one of the key aspects that must be considered in a wide range of applications such as vehicles, aircrafts, and manufacturing equipment. This work demonstrates that further addition of only low-loading hard nanoparticles into a formulated nonasbestos organic brake material directly switches its functionality to a self-lubrication material. More importantly, the newly developed nanocomposites exhibit an extremely low wear rate. Comprehensive investigations on the friction interface reveal that the great friction and wear reduction are due to the formation of a nanostructured lubricious tribofilm. Tribofilm formation is continuously fed by complex molecular species released from the bulk nanocomposites, for which nanoparticles digested within the tribofilm greatly enhance its robustness and lubricity. This work gains insight into the crucial role of the interface nanostructure and paves a route for developing extremely wear-resistant self-lubrication composites for numerous applications.

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Spectroscopic studies and antibacterial activities of pure and various levels of Cu-doped BaSO4 nanoparticles

Cited by 16 publications

References 37 publications

Multistep Sulfur Leaching for the Development of a Highly Efficient and Stable NiS_x/Ni(OH)₂/NiOOH Electrocatalyst for Anion Exchange Membrane Water Electrolysis

Multistep Sulfur Leaching for the Development of a Highly Efficient and Stable NiS_x/Ni(OH)₂/NiOOH Electrocatalyst for Anion Exchange Membrane Water Electrolysis

Mineralogical and granulo-chemical characterization of veins 4 and 10, of Ain Mimoun baryte ore mine

Switching Brake Materials To Extremely Wear-Resistant Self-Lubrication Materials via Tuning Interface Nanostructures

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Spectroscopic studies and antibacterial activities of pure and various levels of Cu-doped BaSO4 nanoparticles

Cited by 16 publications

References 37 publications

Multistep Sulfur Leaching for the Development of a Highly Efficient and Stable NiSx/Ni(OH)2/NiOOH Electrocatalyst for Anion Exchange Membrane Water Electrolysis

Multistep Sulfur Leaching for the Development of a Highly Efficient and Stable NiSx/Ni(OH)2/NiOOH Electrocatalyst for Anion Exchange Membrane Water Electrolysis

Mineralogical and granulo-chemical characterization of veins 4 and 10, of Ain Mimoun baryte ore mine

Switching Brake Materials To Extremely Wear-Resistant Self-Lubrication Materials via Tuning Interface Nanostructures

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Product

Resources

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Multistep Sulfur Leaching for the Development of a Highly Efficient and Stable NiS_x/Ni(OH)₂/NiOOH Electrocatalyst for Anion Exchange Membrane Water Electrolysis

Multistep Sulfur Leaching for the Development of a Highly Efficient and Stable NiS_x/Ni(OH)₂/NiOOH Electrocatalyst for Anion Exchange Membrane Water Electrolysis