Special features of the heat capacity of detonation nanocrystalline diamond

Vasiliev, O. O.; Муратов, В. Б.; Kulikov, L.M.; Гарбуз, В. В.; Дуда, Т. И.

doi:10.3103/s1063457615060039

Cited by 9 publications

(9 citation statements)

References 16 publications

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“…Contrary to the existing data on mass-specific heats and volume fractions by Pak and Cho and by Xuan and Roetzel, almost linear dependences were observed for the molar specific heat of the aqueous dispersion as a function of ND molar fraction. From these dependences, the specific heats of ND phases were assessed as 0.45–0.75 (J/g)/K, which agrees with experimental powder measurements (Table S2) and with the previous data on ND powders and diamond and graphite. , …”

Section: Results and Discussionsupporting

confidence: 86%

Photothermal and Heat-Transfer Properties of Aqueous Detonation Nanodiamonds by Photothermal Microscopy and Transient Spectroscopy

et al. 2021

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Characteristic size and heat-transfer parameters of aqueous detonation-nanodiamond dispersions of various brands as carbon-based nanomaterials for nanofluidic tasks were assessed by confocal photothermal microscopy and transient (time-resolved) photothermal-lens modalities. It was shown that only the part of the transient thermal-lens heating curve of the dispersed sample with light-absorbing particles when the photothermally induced thermal field becomes homogeneous should be used to evaluate the bulk thermal diffusivity. For nanodiamond concentrations of 1−4 mg/ mL, a 1−5% increase in thermal diffusivity and thermal conductivity compared with water is observed. A slowdown in the dissipation of the thermal lens effect due to prolonged heat accumulation by nanodiamonds is shown, which is confirmed by significant photothermal signals from nanodiamond clusters according to confocal photothermal microscopy. The size estimation of separate nanodiamond clusters in solution by nonlinear far-field confocal photothermal microscopy is shown; for the selected nanodiamond brands, photothermal microscopy reveals local signals (200−1000 nm) from nanodiamonds that can be assigned to aggregates of ca. 40−70 nm correlated with calculations from the Gibbs−Kelvin equation by differential scanning calorimetry. The discrimination of nonaggregated and aggregated nanodiamonds by photothermal microscopy is demonstrated.

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Section: Results and Discussionsupporting

confidence: 86%

Photothermal and Heat-Transfer Properties of Aqueous Detonation Nanodiamonds by Photothermal Microscopy and Transient Spectroscopy

et al. 2021

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“…Exact explanation of differences at low (<150 K) temperatures is yet lacking, but most likely, it is caused by impurities remaining after the heat treatment and/or high uncertainties in calorimetric measurements at small values of heat capacity in ref. 31. This agreement supports the suggestion that the non-parabolic behavior of the PDOS at low energies results from surface impurities.…”

Section: Heat Capacity Of Nanodiamondsupporting

confidence: 86%

“…This does not allow estimating the β -factor for diamond nanoparticles using heat capacity data from ref. 31.…”

Section: Applicability Of Different Methods For Calculation Of the β-...mentioning

confidence: 99%

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Inelastic neutron scattering: a novel approach towards determination of equilibrium isotopic fractionation factors. Size effects on heat capacity and beta-factor of diamond

Shiryaev

Polyakov

Rols

et al. 2020

Phys. Chem. Chem. Phys.

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“…Thermodynamics is among the key factors that determine the ability to control this process to get the product in the desired state. Furthermore, thermodynamic properties of nanoforms of substances may deviate from those of bulk (see, for example, [4,5]), and the analysis of their energetics and stability demands reliable thermodynamic data.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic properties of 2H-MoSe2 from first principles quasi-harmonic approximation

Vasiliev

2020

Phys. Chem. Solid St.

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In this paper, we report the results of first-principles calculation of 2H-MoSe2 thermodynamic properties within the quasi-harmonic approximation. The focus of the article is on the temperature dependencies of the heat capacity up to 1000 ℃ and values of enthalpy of formation, enthalpy, and entropy at 298,15 K, and their comparative analysis with the existing experimental data. The results show good general agreement with the published experimental data sets allowing to use them as arbitration of existing discrepancies. Increasing deviations of the heat capacity above the room temperature suggest that factors not included in the quasi-harmonic approximation, such as vibrational anharmonicity, may have a significant influence on the thermodynamics of 2H-MoSe2 in this temperature region. Considering the inconclusive high-temperature data from the experiment, the present results may be recommended as a satisfactory approximation until the appearance of more reliable experimental data or calculation results, taking into account more finite-temperature effects.

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Special features of the heat capacity of detonation nanocrystalline diamond

Cited by 9 publications

References 16 publications

Photothermal and Heat-Transfer Properties of Aqueous Detonation Nanodiamonds by Photothermal Microscopy and Transient Spectroscopy

Photothermal and Heat-Transfer Properties of Aqueous Detonation Nanodiamonds by Photothermal Microscopy and Transient Spectroscopy

Inelastic neutron scattering: a novel approach towards determination of equilibrium isotopic fractionation factors. Size effects on heat capacity and beta-factor of diamond

Thermodynamic properties of 2H-MoSe2 from first principles quasi-harmonic approximation

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