Paramagnetic properties of nanodiamond

Belobrov, P. I.; Gordeev, S. K.; Petrakovskaya, É. A.; Falaleev, O. V.

doi:10.1134/1.1390396

Cited by 25 publications

(14 citation statements)

References 6 publications

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“…This explains spikes (two oppositely charged layers) which depend on the size of detonation nanodiamonds [9] in electron emission researches. The g-factor of a unpaired electron in a nanodiamond is 2.0027 [4], which is closer to free electron (g = 2.0023) than to localized electron on atom (≈ 1) or NV-center. Existence and formation of NV-centres in a 5nm diamond ball is still not a solved problem [10,11].…”

Section: Experimental Evidences Of Surface States In Nanodiamondmentioning

confidence: 85%

“…Alongside with diamagnetic properties nanodiamonds demonstrate paramagnetic properties [4,5], which is unusual for a bulk diamond. The nature of unpaired electron spins resulting in paramagnetism is subject of great interest because unpaired electrons are not connected with d-or f-paramagnetic ions [5].…”

Section: Experimental Evidences Of Surface States In Nanodiamondmentioning

confidence: 99%

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Tamm floating electron in nanodiamond

Denisov,

Belobrov

2011

Preprint

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Nanodiamond exhibits unpaired electrons in magnetization, EPR, NMR and Auger relaxation. Wave functions and eigenenergies of a bound electron in a nanodiamond crystal have been calculated. It has been proved by using quantum mechanical analysis that unpaired electrons are self-condition of a nanodiamond as a limited crystal according to Tamm theory of surface states. The surface electron floating over a nanodiamond gives paramagnetic response and stabilizes the nanoparticle at small range of size. Possibly the spin of the floating electron can be used for floating point calculation in future quantum computers on the base of nanodiamond qubits.

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Section: Experimental Evidences Of Surface States In Nanodiamondmentioning

confidence: 85%

Section: Experimental Evidences Of Surface States In Nanodiamondmentioning

confidence: 99%

Tamm floating electron in nanodiamond

Denisov,

Belobrov

2011

Preprint

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“…Furthermore, paramagnetism of ND is not affected substantially by the method of preparation [49] and purification used, or even by chemical modification of the surface [50]; this also suggests that paramagnetic centres are located in the interior. It has even been argued that an entire ND particle can be regarded as a giant molecular radical [49]. For ordinary ND, it is difficult to distinguish between surface and volume effects, precisely because the particle size and hence the surface-to-volume ratio always vary in an unusually (for nanomaterials) narrow range.…”

Section: Accepted Manuscriptmentioning

confidence: 95%

“…The early naïve view identifying these signals with dangling bonds on the surface has been disproven by NMR spectra more consistent with electron spins distributed within the disordered shell, 0.4 to 1 nm from the surface [48]. Furthermore, paramagnetism of ND is not affected substantially by the method of preparation [49] and purification used, or even by chemical modification of the surface [50]; this also suggests that paramagnetic centres are located in the interior. It has even been argued that an entire ND particle can be regarded as a giant molecular radical [49].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Novel synthesis and properties of hydrogen-free detonation nanodiamond

Бацанов

Осавчук

Naumov

et al. 2018

Materials Chemistry and Physics

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“…Unlike graphitic structures, however many researchers have recently reported the stability, polarizing interaction and magnetism of magnetic impurity centers in diamond. High spin magnetic centers or multi-spin defects have been produced in nanodiamond for the emergence of its ferromagnetism [60,80]. The recent optically observed long lived triplet states [81] in diamond are further evidence of the greater affinity of diamond for spin intermediates and magnetic centers relative to graphitic allotropes.…”

Section: Magnetized Graphitic Instabilitymentioning

confidence: 99%

Treatise on the Resolution of the diamond problem after 200 years

Little

Roache

2008

Progress in Solid State Chemistry

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Abstract:The problem of the physicochemical synthesis of diamond spans more than 200 years, involving many giants of science. Many technologies have been discovered, realized and used to resolve this diamond problem. Here the origin, definition and cause of the diamond problem are presented. The Resolution of the diamond problem is then discussed on the basis of the Little Effect, involving novel roton-phonon driven (antisymmetrical) multi-spin induced orbital orientation, subshell rehybridization and valence shell rotation of radical complexes in quantum fluids under magnetization across thermal, pressure, compositional, and spinor gradients in both space and time. Some experimental evidence of this magnetic quantum Resolution is briefly reviewed and integrated with this recent fruitful discovery. Furthermore, the implications of the Little Effect in comparison to the Woodward-Hoffman Rule are considered. The distinction of the Little Effect from the prior radical pair effect is clarified. The better compatibility of radicals, dangling bonds and magnetism with the diamond lattice relative to the graphitic lattice is discussed. Finally, these novel physicochemical phenomena for the Little Effect are compared with the natural diamond genesis. * corresponding author; email : redge_little@yahoo.com Keywords: diamond, high pressure, plasma deposition, catalytic properties, magnetic properties. Introduction -The Diamond Problem:A long history of giants of science has defined and contributed to the solution of the diamond problem. Section 2 considers the cause of the diamond problem. The list includes Newton, Boyle, Lavoisier, Guillton, Clouet, Karazin, Despretz, Hannay, Moisson, Roozeboom, Jessup, Rossini, Tammann, Parson, Einstein, Leipunski, Bridgman, Berman, Simon, Hershey, von Platen, Lundblad, Hall, Bundy, Strong, Wentorf, Cannon, Eversole, Deryagin, Angus, Fedoseev, Setaka, Matsumoto, Yugo, Linarres, Hemley, Sumiya, and Little. On the basis of these investigators, many technologies have been considered for resolving the diamond problem. These technologies include electric arcs; metal solvents; metal catalysts; electric ovens; electric resistive heaters; anvil vices and presses; electron beams; atomic beams; x-rays, alpha, and beta irradiators; exploding media; rapid lasing and liquid nitrogen quencher; chemical vapor deposition (CVD); hydrogenous plasma and microwave apparatuses; hot filaments; flames; and recently strong magnets. Some of these technologies have resulted in partial successes by the direct method, the indirect method and the H plasma metastable method of forming diamond. The complete Resolution here considers all three of these methods along with natural diamond formation and demonstrates complete Resolution by external magnetization (using external magnetization in conjunction with these three methods and considering intrinsic magnetism in mantle Kimberlite).On this basis, the synthesis and understanding of diamond have developed along side developments in chemistry, physics and engineering dur...

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Paramagnetic properties of nanodiamond

Cited by 25 publications

References 6 publications

Tamm floating electron in nanodiamond

Tamm floating electron in nanodiamond

Novel synthesis and properties of hydrogen-free detonation nanodiamond

Treatise on the Resolution of the diamond problem after 200 years

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