Selective growth of silver particles on the facets of synthetic diamond

Bokhonov, Boris B.; Kato, Hidemi

doi:10.1039/c6ce01536k

Cited by 12 publications

(8 citation statements)

References 45 publications

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“…The scan time and instrument parameters were identical for all the samples with a 2θ angle range between 10° and 90°. The internal standard material added was 9.1 wt.% of Synthetic Diamond [ 21 , 22 ]. The samples were prepared by inter-grinding the samples with the synthetic diamond, using a porcelain mortar.…”

Section: Methodsmentioning

confidence: 99%

Effect of the Class C Fly Ash on Low-Reactive Gold Mine Tailing Geopolymers

et al. 2022

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Beneficiation of industrial wastes, such as mine tailings (MTs), through development of alternative eco-friendly geopolymer binders for construction composites offers a twofold environmental benefit, as it reduces the demand for cement and it increases the sustainability of industrial processes by creating a value-added product from an industrial byproduct. While MTs have the requisite composition for use as a geopolymer precursor, they are often low-reactive. This study explored the effect of Class C Fly Ash (FAc) on the geopolymerization of low-reactive gold MTs. A 10 M sodium hydroxide (NaOH) solution was used as the alkaline activator with four different concentrations of FAc (5, 10, 15 and 20 wt.%). The results indicated that the combination of FAc with the low-reactive gold MTs improved the physicochemical stability of the final geopolymerized samples, with a 95–120% increase in compressive strength, compared to the geopolymer samples of only low-reactive gold MTs. Although some of the strength improvement could be attributed to geopolymerization of the FAc itself, the presence of the FAc also improved the reactivity of the MTs, increasing the geopolymer production of the MTs. This study documents the positive effects of the FAc on gold MTs with low-calcium content and their conversion into sustainable inorganic composite geopolymers for the construction field.

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Section: Methodsmentioning

confidence: 99%

Effect of the Class C Fly Ash on Low-Reactive Gold Mine Tailing Geopolymers

et al. 2022

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“…The latter were selectively coated when the diamond-silver powder mixtures were subjected to annealing. 23 Here, the following questions arise: 1) how stable is the composite structure of diamond with particles of silver selectively deposited on the {111} facets formed by mechanical treatment? 2) Will the distribution of silver over the facets of diamond change upon heat treatment of the crystals?…”

Section: Resultsmentioning

confidence: 99%

“…22 In our previous work, a novel method for selectively depositing metallic particles on facets of synthetic diamond microcrystals was proposed. 23 It was shown that annealing of diamond-silver powder mixtures in oxygen-containing atmospheres at 600-700 °C results in the deposition of silver particles on the {100} facets of diamond. The growth of silver on the {111} facets was negligible in this temperature range.…”

Section: Introductionmentioning

confidence: 99%

Selective deposition of silver particles on {111} or {100} diamond facets

Bokhonov,

Gavrilov,

Dudina

2024

CrystEngComm

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“…To perform the QXRD analysis for the AAMs specimens the X'Pert HighScore software, which includes the Rietveld method [46,47], was used. The internal standard material added was 9.1 wt.% of synthetic diamond with particle sizes between 2-4 μm [48,49]. The samples were prepared by intergrading each one of them with synthetic diamond using a porcelain mortar.…”

Section: Quantitative X-ray Diffraction (Qxrd) Characterizationmentioning

confidence: 99%

Production and Incorporation of Calcium Hydrolyzed Nano-particles in Alkali-Activated Mine Tailings

Perera-Mercado¹,

Zhang²,

Hedayat³

et al. 2023

Preprint

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This work presents the production and incorporation of calcium hydrolyzed nano-solutions at three concentrations (1, 2, and 3 wt.%) in alkali-activated gold mine tailings (MTs) from Arequipa, Perú. A first activator solution of sodium hydroxide (NaOH) at 10M was used. The calcium hy-drolyzed nano-solutions acted as a secondary activator and as additional calcium resource for the alkali-activated materials (AAMs) based on the low-calcium gold MTs. High-resolution trans-mission electron microscopy/energy-dispersive x-ray spectroscopy (HR-TEM/EDS) analyses were carried out to characterize the morphology, size, and structures of the calcium hydrolyzed na-noparticles. Fourier transform infrared (FTIR) analyses then were used to understand the chemical bonding interactions in the calcium hydrolyzed nanoparticles and in the AAMs. Scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDS) and Quantitative X-ray diffraction (QXRD) were performed to study the structural, chemical, and phase compositions of the AAMs; uniaxial compressive tests evaluated the compressive strength of the reacted AAMs; and Nitrogen adsorption-desorption analyses measured the porosity changes at nanostructure level in the AAMs. The results indicate that each increase in the concentration of the calcium hydrolyzed nano-solution had a direct/proportional effect on the mechanical properties of the AAMs samples. The AAMs with 3 wt.% calcium-hydrolyzed nano-solution had the highest compressive strength value of 15.16 MPa, which represented an increase of 62% compared to the original system without nanoparticles and aged under the same conditions of 70°C for seven days. These results provide useful information about the positive effect of calcium-hydrolyzed nanoparticles on gold MTs and their conversion into sustainable building materials through alkali activation.

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Selective growth of silver particles on the facets of synthetic diamond

Cited by 12 publications

References 45 publications

Effect of the Class C Fly Ash on Low-Reactive Gold Mine Tailing Geopolymers

Effect of the Class C Fly Ash on Low-Reactive Gold Mine Tailing Geopolymers

Selective deposition of silver particles on {111} or {100} diamond facets

Production and Incorporation of Calcium Hydrolyzed Nano-particles in Alkali-Activated Mine Tailings

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