Study of the Composition and Physicochemical Properties of Diamond Hydrogels

Larionova, I. S.; Frolov, A. V.; Poleva, L. I.; Бычин, Н. В.

doi:10.1023/b:coll.0000030851.55494.65

Cited by 5 publications

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“…Fractionation of NDs was investigated previously [ 25 , 26 , 29 , [34] , [35] , [36] , [37] , [38] , [39] , [40] , [41] , [42] , 76 ]. However, optical spectra of different fractions have not been considered in detail.…”

Section: Resultsmentioning

confidence: 99%

“…However, optical spectra of different fractions have not been considered in detail. Previously, it was found that non-diamond carbon could be removed from ND fractions [ 39 ] and the fractions have different surface chemical composition and therefore physicochemical properties [ 40 , 76 ], which apparently may affect the optical properties. Thus, we used centrifugation to see in more detail how the UV/vis spectrum and absorption at 532 nm by OA measurements depend on fraction size and composition.…”

Section: Resultsmentioning

confidence: 99%

“…Additionally, the interest recently has been focused on ND fractionation as it may produce the materials with the minimum particle size [ 25 , 26 , 29 , [34] , [35] , [36] , [37] , [38] , [39] , [40] , [41] , [42] ] and gives particles with defined aggregate sizes for various applications like film and gel production [ 15 ]. Previously, it was reported that ND fractions have different surface chemical composition [ 40 ]; FTIR and especially DLS [ 35 , 36 , 43 ] are commonly used methods for fraction characterization, but the absorption spectra were not considered in full.…”

Section: Introductionmentioning

confidence: 99%

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Absorption spectra of nanodiamond aqueous dispersions by optical absorption and optoacoustic spectroscopies

et al. 2018

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The multispectral modality and technique for optically dense samples of optoacoustic spectroscopy were applied to measure spectra and high absorbances of concentrated aqueous dispersions of undoped nanodiamonds. The data from optoacoustic and optical transmission measurements and DSC data of the mean particle size by the Gibbs–Kelvin equation are compared to estimate the difference in composition of various nanodiamond trademarks. Optoacoustic spectra confirm the contribution of surface dimer chains into the absorption of nanodiamonds in the long wavelength range. Optoacoustic and conventional absorption spectra of aqueous solutions of nanodiamond fractions after centrifugation (15300g) and ultracentrifugation (130000g) revealed a separation of a highly absorbing non-diamond sp2 phase. The two-step separation by ultracentrifugation followed by extra centrifugation made it possible to isolate a highly absorbing and soluble nanodiamond phase with the particle size of 3.6 nm, showing a change in spectra compared to the starting nanodiamond material.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Absorption spectra of nanodiamond aqueous dispersions by optical absorption and optoacoustic spectroscopies

et al. 2018

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“…To use the equation, densities of the base fluid and particles are needed. The latter is determined by a hydrostatic weighing in distilled water [13] or by pycnometry (helium) [14,15]. As for ND powders, manufacturers do not often provide this parameter.…”

Section: Resultsmentioning

confidence: 99%

Nanodiamond aqueous dispersions as potential nanofluids: the determination of properties by thermal lensing and other techniques

Usoltseva¹,

Volkov²,

Авраменко³

et al. 2018

Nanosystems: Phys. Chem. Math.

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Thermal-lens spectrometry was used to characterize thermal diffusivity and thermal conductivity of aqueous nanodiamond dispersions at the level of mg/mL, accompanied by heat capacity, density, and viscosity measurements and modelling. The data from thermal lensing corresponding to thermal equilibrium show 3 -7 % increase in thermal conductivity of the studied dispersions, show good precision and agree with the existing data.

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“…Structural heterogeneity of DCM is evidenced by a scatter in the measurements of material characteristics and is believed to be the result of non-equilibrium conditions. In DCM, light fractions obtained by milling and centrifugation are observed with distinct characteristics [3,4]. These results may reflect a complicated distribution of the diamond areas in the particles.…”

Section: Introductionmentioning

confidence: 97%

Structural heterogeneity of diamond-containing detonation material

Korets

Крылов

Mironov

2010

Eur. Phys. J. Appl. Phys.

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Abstract. Diamond-containing material (DCM) synthesized by detonation was separated into fractions. Raman and infrared spectra and X-ray diffraction patterns of the individual fractions were measured. The particles of this material were characterized by the variable ratio of the diamond (sp 3 ) and non-diamond components. The distribution of sp 3 -grains in the particles was of complicated character. The fine DCM particles contained an insignificant amount of diamond. The influence of density fluctuations on the DCM formation is discussed.

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Study of the Composition and Physicochemical Properties of Diamond Hydrogels

Cited by 5 publications

References 0 publications

Absorption spectra of nanodiamond aqueous dispersions by optical absorption and optoacoustic spectroscopies

Absorption spectra of nanodiamond aqueous dispersions by optical absorption and optoacoustic spectroscopies

Nanodiamond aqueous dispersions as potential nanofluids: the determination of properties by thermal lensing and other techniques

Structural heterogeneity of diamond-containing detonation material

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