Nanographites, their compounds, and film structures

Зиатдинов, А. М.

doi:10.1007/s11172-015-0812-y

Cited by 14 publications

(10 citation statements)

References 89 publications

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“…NG exhibits a hexagonal crystalline system and layered structure, which promotes self-lubricating properties, reducing the probability of direct contact between the composite material and the friction pair by forming a lubricating transfer layer between them; therefore, improving the friction properties of its composites. 27 In addition, the friction coefficient of composites is also closely related to the physical and chemical structure, size, and shape of the filler. 28 Consequently, the reasons for the different tribological behaviors of the NG/PI composites with different contents of the NG filler are listed as follows: When the NG content is less than 5 wt%, because of insufficient filler content, the speed at which the lubricating layer is formed, is probably lower than the speed of the degradation of the lubricating layer during the friction experiment, resulting in an insufficient lubricating effect of the NG.…”

Section: Friction Coefficientmentioning

confidence: 99%

Friction and wear behavior of polyimide matrix composites filled with nanographite

Wan

Yao

et al. 2021

J of Applied Polymer Sci

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In this study, nanographite (NG), as a lubricant additive, and polyimide (PI) were used to fabricate NG/PI composites via a hot compression molding process. The tribological properties of the NG/PI composites with different NG mass contents (0-10 wt%) were tested using a reciprocating ball-on-disc contact tribometer matched with a GCr15 rubbing pair. The thermal stability, surface hardness, and compression strength of the composites were discussed. The results revealed that a small quantity of nanofillers greatly reduced the friction coefficient and increased the wear resistance of the NG/PI composites. Despite a minor decrease in mechanical performance, the composite with 5 wt% of NG filler exhibited improved tribological properties; it showed a 55.63% reduction in the friction coefficient and a reduction of 97.39% in the wear rate compared with neat PI. Moreover, an increase in the glass transition temperature (T g ) of the NG/PI composites indicated the enhancement of their thermal stability and wear resistance. Scanning electron microscopy (SEM) analyses showed that the main wear mechanism of the composites was fatigue wear. These findings suggest that the 5 wt% NG/PI composite could be a significant contribution to the field of tribological engineering plastics.

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Section: Friction Coefficientmentioning

confidence: 99%

Friction and wear behavior of polyimide matrix composites filled with nanographite

Wan

Yao

et al. 2021

J of Applied Polymer Sci

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“…According to both theoretical [1,[16][17][18] and experimental studies [1,2,[19][20][21][22][23][24][25] near the zigzag edges of honeycomb carbon structures the specific edge π-electron states form, whose energy of peak in the electron density of states is only 25±5 meV below the Fermi energy. Spins of carbon atoms in zigzag edges are polarized [1,2,[16][17][18].…”

Section: Samples Preparationmentioning

confidence: 99%

“…Due to combination of sub-miniature size and a number of valuable physical properties (good electrical conductivity, high emission values, nonlinear optical characteristics, and nontrivial magnetic properties) they could find practical applications in various engineering fields in the future [1]. In terms of practical application, the film structures and composites of nanographites are the most promising [2].…”

Section: Introductionmentioning

confidence: 99%

Nanographite Films: Structure and Properties

Nikolenko

Зиатдинов

2016

SSP

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Nanographite film structures of different morphology have been grown on various substrates using the activated carbon fibers (ACF) as a source of nanographites. As was revealed from the data of Raman spectroscopy, the fabricated films consisted mainly of the same structural blocks as the initial ACF. Scanning electron microscopy was used to study the films morphology. The presence of lengthy zigzag edges in nanographites, which is prerequisite for their nontrivial electronic structure and magnetic characteristics, has been established. The X-ray photoelectron spectroscopy data show the appearance of expressed maxima in the C1s spectra of the films in the usually observable "diffuse" structure of π→π* shake-up satellites, π and π + σ plasmons.

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“…The effect of the surface and edge atoms on electronic structure increases with decreasing size of particle and depends on the geometry of the peripheral atom positions [1][2][3]. According to both theoretical [4][5][6] and experimental studies [3,[7][8][9][10][11][12][13][14][15][16][17] near the zigzag edges of honeycomb carbon structures the specific edge π-electron band forms (Fig. 1), whose energy of peak in the electron density of states is only 25±5 meV below the Fermi energy [8,9].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Adsorbed Molecules on Electronic Structure and Magnetic Properties of Nanographites

Зиатдинов

Kainara

Saenko

2016

SSP

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The results of investigation of changes in electronic structure and magnetic properties of multilayer graphene nanoclusters (nanographites) occurring during their interaction with adsorbed chlorine molecules are presented. The found reversible decrease in the density of states of current carriers D(EF) at the Fermi energy EF can be explained by the spin-splitting of edge π-electron states in nanographites induced by the enhancement of electron-electron interactions due to increase of the D(EF) at partial transfer of the electron density from nanographites to chlorine adatoms. The revealed irreversible decrease in the concentration of localized spins indicates that the electron spins of 3p-orbitals of chlorine and unpaired (dundling) σ-orbitals of edge carbon atoms are coupled also at this interaction, i.e. the edge covalent compound of nanographite with chlorine forms. Character of changes in the spin-relaxation rate of π-electrons depending on the amount of adsorbed chlorine molecules and on temperature in chlorinated samples are also consistent with the above model of nanographite-chlorine interaction.

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Nanographites, their compounds, and film structures

Cited by 14 publications

References 89 publications

Friction and wear behavior of polyimide matrix composites filled with nanographite

Friction and wear behavior of polyimide matrix composites filled with nanographite

Nanographite Films: Structure and Properties

The Effect of Adsorbed Molecules on Electronic Structure and Magnetic Properties of Nanographites

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