The effect of high power ultrasound on an aqueous suspension of graphite

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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“…The heavily stressed grains might be preferentially destroyed (Guittonneau et al. ) and during such transformations N and Xe are lost.…”

Section: Resultsmentioning

confidence: 99%

Effects of sonochemical treatment on meteoritic nanodiamonds

Fisenko

Verchovsky

Shiryaev

et al. 2016

Meteorit & Planetary Scien

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“…In another study, Sim et al [34] synthesized graphene layers using the ultrasonic dispersion of graphite flakes. Ultrasound treatment was used to study the decrease of the granulometry of graphite, due to the cavitation, which allows erosion by separating grains [35]. Belviso et al [36] studied the effect of ultrasonic treatment on zeolite synthesized from coal fly ash.…”

Section: Fly Ash Sonicationmentioning

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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“…These extreme conditions, in air‐saturated sonicated solutions, dissociate the solvent and form peroxyl radicals 14. The radical reactions are usually destructive and very effective in breaking CC bonds 15. The long lifetimes of the peroxyl radicals16 are responsible for the damage of the graphene layers.…”

Section: Step 1: Ultrasonication Of Graphite In a Solventmentioning

confidence: 99%

Rolling up a Graphene Sheet

et al. 2013

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Carbon Nanotubes, CNTs, have been described as rolled-up graphene layers. Matching this concept to experiments has been a great experimental challenge for it requires a method to exfoliate graphite, generate ordered and stable dangling carbon bonds, and roll up the layer without affecting the unpaired electrons of the dangling bonds that finally have to zip up in an orderly fashion: A tall order for any synthetic strategy. The combined use of ultrasonication of graphite in dimethylformamide and addition of ferrocene aldehyde just does it!

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The effect of high power ultrasound on an aqueous suspension of graphite

Abstract: To cite this version:Fabrice Guittonneau, Abdesselam Abdelouas, Bernd Grambow, Sandrine Huclier. The effect of high power ultrasound on an aqueous suspension of graphite. Ultrasonics Sonochemistry, Elsevier, 2010, 17, pp

Cited by 40 publications

References 34 publications

Effects of sonochemical treatment on meteoritic nanodiamonds

Effects of sonochemical treatment on meteoritic nanodiamonds

Carbon rich fly ash and their nanostructures

Rolling up a Graphene Sheet

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