Powdered Hexagonal Boron Nitride Reducing Nanoscale Wear

Chkhartishvili, Levan; Matcharashvili, Teimuraz; Esiava, R.; Tsagareishvili, Otar; Gabunia, Domenti; Margiev, Boris; Gachechiladze, Archil

doi:10.1142/9789814460187_0109

Cited by 6 publications

(4 citation statements)

References 9 publications

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“…Another necessary step in the estimation of the surface-dipole layer effect is to make a realistic assumption about the shape of particles of the material in its powdered form. In particular, for h-BN nanopowders, we have already developed [ 7 – 9 ] a morphology model and proposed a disc-like shape with a fixed aspect ratio η = r / h , where h is the thickness of the disc and r is its radius.…”

Section: Methodsmentioning

confidence: 99%

Nanoparticle Near-Surface Electric Field

Chkhartishvili

2016

Nanoscale Res Lett

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Theoretical studies show that surface reconstruction in some crystals involves splitting the surface atomic layer into two—upper and lower—sublayers consisting of atoms with only positive or only negative effective electric charges, respectively. In a macroscopic crystal with an almost infinite surface, the electric field induced by such a surface-dipole is practically totally concentrated between the sublayers. However, when the material is powdered and its particles are of sufficiently small sizes, an electric field of a significant magnitude can be induced outside the sublayers as well. We have calculated the distribution of the electric field and its potential induced at the surface of a disc-shaped particle. The suggested novel nanoscale effect explains the increase in physical reactivity of nanopowders with decreasing particle sizes.

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Section: Methodsmentioning

confidence: 99%

Nanoparticle Near-Surface Electric Field

Chkhartishvili

2016

Nanoscale Res Lett

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“…The nanocrystalline boron nitride needed in this approach was preprepared similarly to boron nitride nanopowders used for lubrication, i.e., by chemical methods from fluid charges [31][32][33][34][35].…”

Section: Synthesis Of Ferromagnetic Clusters Doped Boron Nitride and ...mentioning

confidence: 99%

Nanopowder Boron Compounds Doped with Ferromagnetic Clusters for BNCT

Makatsaria,

Chkhartishvili,

Dekanosidze

et al. 2023

Int J Adv Nano Comput Anal

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Study examines the problem of development of novel nanomaterials serving for boron 10B isotope delivery agents in Boron-Neutron-Capture-Therapy (BNCT). For this purpose, there is done a mini-review on Nano powder boron compounds especially prospective for BNCT; magnetic Nano carriers of the therapeutically active agents in general, delivery of which can be controlled by using of an external magnetic field; as well as methods of synthesis of nanocomposites comprising components of both kinds. Based on recent literature analysis, boron nitride and boron carbide Nano powders doped with ferromagnetic iron oxide nanoclusters are recommended for BNCT as effective delivery agents with good biocompatibility.

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“…Note that for layered crystals and, in particular, h-BN, based on both experimental and theoretical arguments, a disk-shaped morphological model was introduced [13][14][15], which corresponds well to the approximation used above, replacing crystal polygonal face with a circle.…”

Section: We Image the Free Surface Reconstruction In H-bn Based On H-...mentioning

confidence: 99%

Mean Electric Field of Dielectric Nanoparticle

Chkhartishvili,

Dekanosidze,

Esiava

2023

Int J Adv Nano Comput Anal

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The nanoscale effect of the formation of an electric field near the surface of a dielectric nanoparticle is discussed within the framework of the proposed model based on the reconstruction of the crystal surface, including the splitting of the surface atomic layer into two parallel sublayers consisting of atoms with only positive or only negative effective static electric charges, respectively. The mean electric field potential and strength are obtained depending on the distance from the surface and the numerical values of their parameters for hexagonal boron nitride are estimated.

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Powdered Hexagonal Boron Nitride Reducing Nanoscale Wear

Cited by 6 publications

References 9 publications

Nanoparticle Near-Surface Electric Field

Nanoparticle Near-Surface Electric Field

Nanopowder Boron Compounds Doped with Ferromagnetic Clusters for BNCT

Mean Electric Field of Dielectric Nanoparticle

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