Detonation diamonds in Ukraine

Новиков, Н. В.; Bogatyreva, G. P.; Voloshin, M. N.

doi:10.1134/1.1711432

Cited by 21 publications

(11 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These bands could be assigned to O-H vibrations, probably due to the presence of physisorbed water [32,36,[48][49][50]. It is worth mentioning that they are preserved after the thermal pretreatment of the samples, and according to [35,48], this is due to the location of water in the textural pores of UDD. A well-defined band at about 1730 cm −1 appears in all spectra and it could be ascribed to species containing C=O from carboxylic (COOH), lactone (COO), or cyclic ketone (-CO-) structures [32,34,[48][49][50].…”

Section: Ftir Spectroscopymentioning

confidence: 99%

“…Recently, the interest toward nanosized sp 3 carbon modifications has been also increased due to their unique properties for electrical, optical, and mechanical applications [32][33][34][35][36]. The detonation-synthesized nanosized diamond powders (UDD) are distinguished by narrow distribution of particle size and extremely large number of uncompensated surface bonds [32,[34][35][36][37][38][39]. The individual particles comprise cubic diamond cores with structural defects, surrounded by shells of nondiamond carbon.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Iron-oxide-modified nanosized diamond: Preparation, characterization, and catalytic properties in methanol decomposition

Tsoncheva

Ivanova

Paneva³

et al. 2006

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

Section: Ftir Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Iron-oxide-modified nanosized diamond: Preparation, characterization, and catalytic properties in methanol decomposition

Tsoncheva

Ivanova

Paneva³

et al. 2006

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

“…ND materials, such as films and especially powders, can be prepared commercially in ton quantities, for instance, by detonation or chemical vapor deposition (CVD) based techniques and have been explored by several groups in the past few years. [3,9] A major challenge is the purification of the crude ND powder. The powder can either be treated with oxidizing acid mixtures at higher temperatures, [10,11] directly converted into a fluorinated substrate with a H 2 /F 2 mixture, [12] or reduced with LiAlH 4 or borane in THF.…”

Section: Diamondoids and Nanodiamondsmentioning

confidence: 99%

“…A higher yielding synthesis based on rearrangements was published in 1975 by Burns et al who started from 1diamantanecarboxylic acid (28) that gave 3 through a socalled "single homologation" in low yield [Eq. (9)]. [63] An even better synthesis for 3 was discovered by Hamilton et al when heating 13 on a platinum catalyst in the absence of hydrogen gas, [64,65] which results in the formation of cyclic monoolefins that undergo Diels-Alder reactions with butadiene.…”

Section: Origin and Synthesis Of Diamondoidsmentioning

confidence: 99%

Diamonds are a Chemist's Best Friend: Diamondoid Chemistry Beyond Adamantane

2008

View full text Add to dashboard Cite

Marilyn Monroe knew that "diamonds are a girl's best friend" but, in the meantime, many chemists have realized that they are also extremely attractive objects in contemporary chemistry. The chemist's diamonds are usually quite small (herein: nanometer-sized "diamondoids") and as a result of their unique structure are unusual chemical building blocks. Since lower diamondoids (up to triamantane) have recently become available in large amounts from petroleum and higher diamondoids (starting from tetramantane) are now also accessible from crude oil new research involving them has begun to emerge. Having well-defined structures makes these cage compounds so special compared to other nanometer-scale diamonds. Selective and high-yielding synthetic approaches to the functionalization of diamondoids gives derivatives that can find applications in, for example, polymers, coating materials, drugs, and molecular electronics.

show abstract

“…Of certain interest in this context are data on purification of synthetic diamonds. Commonly, an agglomerate containing firmly bound graphite, diamonds, catalyst, carbides, and the material of the high-pressure container (aragonite, silicon dioxide, silicates) is removed from the reaction mixture in synthesis of diamonds [2]. The first stage of purification consists in dissolution of the catalyst and the carbide phase with acids or mixtures of these.…”

mentioning

confidence: 99%

Processing of wastes from manufacture of cut diamonds

2004

View full text Add to dashboard Cite

Test experiments on recovery and purification of diamonds in melts based on alkali metal hydroxides and ammonium hydrofluoride were carried out. A method for processing of diamond-containing materials is suggested and apparatus for implementing this technology is described.Manufacture of cut diamonds from natural diamonds mainly involves their physical and mechanical treatments: cutting, grinding, and faceting. In the process, a significant part of the starting material is transformed into a waste in the form of fragments, chips, and dust. The existing process for recovery of diamonds from industrial waste consists in the following. Wastes collected from working places together with contaminants are subjected to magnetic separation and manual sorting. After that, the waste is burnt in special furnaces. The heavy and light fractions of the resulting ash are separated in bromoform (CHBr 3 ). The heavy fraction is processed in boiling solutions of acids: hydrochloric (1 : 1), nitric (1 : 1), and concentrated sulfuric. The total duration of such a treatment is 537 h. A dried residue is leached by fusing it with sodium hydroxide at 600oC and dissolving the fusion cake in hot water. The solid residue is again treated with HCl, washed, and dried, with undissolved impurities removed and diamonds divided into fractions manually. Thus, the existing process is lowintense and multistage and involves the use of boiling concentrated solutions of strong acids; moreover, more than 10% of the diamond material is lost through etching.In this context, it seems appropriate to develop effective chemical solvents that would ensure dissolution of all foreign substances in the diamond-containing waste without etching of the diamonds themselves. Solvents of this kind were sought-for taking into account the properties of diamonds and the composition of industrial wastes from manufacture of cut diamonds.It should be noted that the most difficultly soluble substances among the foreign impurities contained in the waste in question are carbon (graphite), corundum, carbides (e.g., SiC), quartz sand, and minerals [1]. Removal of metallic and organic components presents no special problems. Of certain interest in this context are data on purification of synthetic diamonds. Commonly, an agglomerate containing firmly bound graphite, diamonds, catalyst, carbides, and the material of the high-pressure container (aragonite, silicon dioxide, silicates) is removed from the reaction mixture in synthesis of diamonds [2]. The first stage of purification consists in dissolution of the catalyst and the carbide phase with acids or mixtures of these. In the second stage, graphite is selectively oxidized with various reagents. In the third stage, compounds that are insoluble in water, solutions of acids (with the exception of hydrofluoric acid), and alkalis are removed, if the content of these compounds exceeds 1% of the total mass [3].It is known that acid solutions, suspensions, and melts of alkali metal hydroxides, nitrates, and carbonates can be used to se...

show abstract

Detonation diamonds in Ukraine

Cited by 21 publications

References 0 publications

Iron-oxide-modified nanosized diamond: Preparation, characterization, and catalytic properties in methanol decomposition

Iron-oxide-modified nanosized diamond: Preparation, characterization, and catalytic properties in methanol decomposition

Diamonds are a Chemist's Best Friend: Diamondoid Chemistry Beyond Adamantane

Processing of wastes from manufacture of cut diamonds

Contact Info

Product

Resources

About