Graphite-to-diamond transformation induced by ultrasound cavitation

Khachatryan, Artak; Aloyan, S. G.; May, Paul; Sargsyan, R. V.; Khachatryan, Vahe; Baghdasaryan, V.S.

doi:10.1016/j.diamond.2008.01.112

Cited by 98 publications

(41 citation statements)

References 16 publications

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“…Two research groups reported formation of nanostructured (Galimov, Kudin, Skorobogatski, et al, 2004) and monocrystalline (Khachatryan, Aloyan, May, et al, 2008) micron-sized diamond particles. Cavitation destruction of benzene resulted in production of particles consisting of aggregate of nanocrystallites of 10-30 nm in size (Galimov et al, 2004).…”

Section: Diamond Synthesis Using Ultrasound Cavitationmentioning

confidence: 99%

“…Cavitation destruction of benzene resulted in production of particles consisting of aggregate of nanocrystallites of 10-30 nm in size (Galimov et al, 2004). Micron-sized diamond crystals (5-10 mm) were produced by the cavitation synthesis method from a suspension of powdered graphite (100-200 mm) in organic liquid (Khachatryan et al, 2008). The major factor influencing the diamond yield in the cavitation process was the composition of the cavitation medium.…”

Section: Diamond Synthesis Using Ultrasound Cavitationmentioning

confidence: 99%

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Production of Nanodiamond Particles

Shenderova

2014

Comprehensive Hard Materials

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Section: Diamond Synthesis Using Ultrasound Cavitationmentioning

confidence: 99%

Section: Diamond Synthesis Using Ultrasound Cavitationmentioning

confidence: 99%

Production of Nanodiamond Particles

Shenderova

2014

Comprehensive Hard Materials

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“…; Khachatryan et al. ) and for dispersal and surface modification of detonation nanodiamonds (Uchida et al. ).…”

Section: Introductionmentioning

confidence: 99%

Effects of sonochemical treatment on meteoritic nanodiamonds

Fisenko

Verchovsky

Shiryaev

et al. 2016

Meteorit & Planetary Scien

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A nanodiamond‐rich fraction (NDF) separated from the Orgueil meteorite was subjected to a high‐intensity ultrasonic treatment in a weakly acidic aqueous solution. After sedimentation by centrifugation, two fractions of grains (suspension, designated as OD7C and sediment, designated as OD7D) with different properties have been obtained. The following effects of the sonication were revealed from comparison of the contents and isotope compositions of C, N, and Xe released during stepped pyrolysis and combustion of the fractions OD7C and OD7D, the initial NDF and two grain‐size fractions (OD10 and OD15) produced without sonication (a) surface layer of the sonicated diamond grains is modified to different extent in comparison with nontreated ones, (b) in some grains concentrations of the bulk N and Xe a reduced significantly, and (c) nondiamond nitrogen containing phases (e.g., Si3N4) have been destroyed. It is suggested that combined effects of the sonication and centrifugation observed for the fractions OD7C and OD7D are due to differences in surface chemistry of the nanodiamond grains, which statistically influences behavior of nanoparticles during the sonication resulting in their preferential modification in the different reaction zones of the cavitating fluid.

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“…These carbon atoms mostly exist in the form of graphite-like sp 2 and diamond-like sp 3 hybridization states [17]. Ultrasound waves have been reported to be effective in transforming graphite into diamonds [18] by transforming sp 2 -hybridized carbons into the sp 3 state. Moreover, it has been reported that the incomplete combustion of rich-carbon materials also leaves hydrocarbon compounds [19].…”

Section: Introductionmentioning

confidence: 99%

Carbon rich fly ash and their nanostructures

Salah¹,

S²,

H³

et al. 2016

Carbon letters

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Carbon rich fly ash was recently reported to have compositions that are ideal for use as a precursor and catalyst for carbon nanotube growth. This fly ash powder is mostly composed of pure carbon, predominantly present as sp 2 . In this work, the effect of sonication time on the morphology and structural properties of carbon rich fly ash particles is reported. The obtained results show that ultrasound treatment is an effective tool for producing ultrafine particles/fragments with higher porosity, which might be suitable for the adsorption of gasses. Moreover, carbon nanoparticles (CNPs) of this fly ash were produced in parallel using the ball milling technique, and were evaluated as reinforcements for epoxy based composites. These CNPs have almost spherical shapes with particle sizes of around 30 nm. They were found to have strong C=O carbonyl group bonds, which might be generated during the ball milling process. The tensile testing results of a fly ash CNP reinforced epoxy composite showed significant improvements in the mechanical properties, mainly in the stiffness of the polymer. The stiffness value was increased by around 23% of that of neat epoxy. These CNPs with chemically active groups might also be useful for other applications.

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Graphite-to-diamond transformation induced by ultrasound cavitation

Cited by 98 publications

References 16 publications

Production of Nanodiamond Particles

Production of Nanodiamond Particles

Effects of sonochemical treatment on meteoritic nanodiamonds

Carbon rich fly ash and their nanostructures

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