Unique rheological behavior of detonation nanodiamond hydrosols: The nature of sol-gel transition

Kuznetsov, Nikita M.; Белоусов, С. И.; Bakirov, Artem V.; Чвалун, С. Н.; Kamyshinsky, Roman; Mikhutkin, A. A.; Vasiliev, Alexander L.; Tolstoy, Peter M.; Mazur, Anton S.; Eidelman, E. D.; Yudina, Elena B.; Vul, A. Ya.

doi:10.1016/j.carbon.2020.01.054

Cited by 23 publications

(17 citation statements)

References 30 publications

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“…3 nm DNDs a mode size of 5.2 nm, and a certain occurrence of > 10 nm DND particles and/or DND aggregates). The SAXS-derived mean size of the primary DND particles using our model agrees well with the sizes reported in previous SAXS studies 30,32,38,39 . It confirms the applicability of the used model.…”

Section: Particle Size Distributionssupporting

confidence: 88%

“…As such, SAXS data can be used for calculation of the volume/mass-weighted PSD. SAXS is regularly used for determination of a mean DND size or PSD 32,38,39 as well as for studying of aggregation and aggregate structures in various environments from hydrocolloids 30,31 to DNDpolymer composites 40 . XRD provides an average crystallite size, more exactly a coherence length, obtained from the Scherrer equation using, among others, the full width at half maximum (FWHM) of diamond <111> diffraction line and K-factors corresponding to cubic (green) and spherical (orange) particle shape.…”

Section: Particle Size Distributionsmentioning

confidence: 99%

“…Recently, spontaneous formation of DND particles aggregates in colloids was shown and studied by cryo-TEM and SAXS experiments 30,31 . Although we cannot exclude such aggregation in our samples (which indeed sometime occurs, see the SAXS data), we suggest that these aggregates consist of only weakly bound particles and can be broken by a force e.g.…”

Section: Particle Size Distributionsmentioning

confidence: 99%

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Size Effects on Surface Chemistry and Raman Spectra of Sub-5 nm Oxidized High-Pressure High-Temperature and Detonation Nanodiamonds

et al. 2021

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Understanding materials with dimensions down to few nanometers is of major importance for fundamental science as well as prospective applications. Structural transformation and phononconfinement effects in the nanodiamonds (NDs) have been theoretically predicted below 3 nm size. Here we investigate the effect of size on the surface chemistry, microscopic structure, and Raman scattering of high-pressure high-temperature (HPHT) and detonation nanodiamonds (DNDs) down to 2-3 nm. The surface and size of NDs are controlled by annealing in air and ultracentrifugation resulting in three ND fractions. Particle size distribution (PSD) of the fractions is analyzed by combining dynamic light scattering (DLS), analytical ultracentrifugation (AUC), small angle X-ray scattering (SAXS), X-ray diffraction (XRD), and transmission electron microscopy (TEM) as complementary techniques. Based on the obtained PSD we identify size-dependent and synthesis-dependent differences of NDs properties. In particular, interpretation of Raman scattering on NDs is revisited. Comprehensive comparison of detonation 3 and pure monocrystalline HPHT NDs reveals effects of diamond core size and defects, chemical and temperature (in)stability as well as limitations of current phonon confinement models. In addition, low-frequency Raman scattering in the 20 -200 cm -1 range is experimentally observed.The size dependence of this signal for both HPHT NDs and DNDs suggests that it may correspond to confined acoustic vibrational, "breathing-like" modes of NDs.

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Section: Particle Size Distributionssupporting

confidence: 88%

Section: Particle Size Distributionsmentioning

confidence: 99%

Section: Particle Size Distributionsmentioning

confidence: 99%

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Size Effects on Surface Chemistry and Raman Spectra of Sub-5 nm Oxidized High-Pressure High-Temperature and Detonation Nanodiamonds

et al. 2021

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“…It was shown [ 19 ] that the sol-gel transition occurs when the ND concentration exceeds 5–6% w / w for sols with a negative electrokinetic potential. Using a rotational viscosimeter gives an excellent opportunity to measure the rheological properties over the wide range of shear rates: at high concentrations, the viscosity decreases linearly with the shear rate, proving the sol-gel transition.…”

Section: Resultsmentioning

confidence: 99%

“…Using a rotational viscosimeter gives an excellent opportunity to measure the rheological properties over the wide range of shear rates: at high concentrations, the viscosity decreases linearly with the shear rate, proving the sol-gel transition. The authors demonstrated the appearance of yield stress and also indicated the formation of some networks in concentrated sols [ 19 ]. When the yield stress is overcome, constant viscosity is observed (Newtonian behavior for sols with concentrations below 5% w / w ).…”

Section: Resultsmentioning

confidence: 99%

Thermal Conductivity of Detonation Nanodiamond Hydrogels and Hydrosols by Direct Heat Flux Measurements

Usoltseva

Volkov

Karpushkin

et al. 2021

Gels

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The methodology and results of thermal conductivity measurements by the heat-flow technique for the detonation nanodiamond suspension gels, sols, and powders of several brands in the range of nanoparticle concentrations of 2–100% w/w are discussed. The conditions of assessing the thermal conductivity of the fluids and gels (a FOX 50 heat-flow meter) with the reproducibility (relative standard deviation) of 1% are proposed. The maximum increase of 13% was recorded for the nanodiamond gels (140 mg mL−1 or 4% v/v) of the RDDM brand, at 0.687 ± 0.005 W m−1 K−1. The thermal conductivity of the nanodiamond powders is estimated as 0.26 ± 0.03 and 0.35 ± 0.04 W m−1 K−1 for the RUDDM and RDDM brands, respectively. The thermal conductivity for the aqueous pastes containing 26% v/v RUDDM is 0.85 ± 0.04 W m−1 K−1. The dignities, shortcomings, and limitations of this approach are discussed and compared with the determining of the thermal conductivity with photothermal-lens spectrometry.

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Size and nitrogen inhomogeneity in detonation and laser synthesized primary nanodiamond particles revealed via salt-assisted deaggregation

Stehlík

Henych

Štenclová

et al. 2021

Carbon

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Unique rheological behavior of detonation nanodiamond hydrosols: The nature of sol-gel transition

Cited by 23 publications

References 30 publications

Size Effects on Surface Chemistry and Raman Spectra of Sub-5 nm Oxidized High-Pressure High-Temperature and Detonation Nanodiamonds

Size Effects on Surface Chemistry and Raman Spectra of Sub-5 nm Oxidized High-Pressure High-Temperature and Detonation Nanodiamonds

Thermal Conductivity of Detonation Nanodiamond Hydrogels and Hydrosols by Direct Heat Flux Measurements

Size and nitrogen inhomogeneity in detonation and laser synthesized primary nanodiamond particles revealed via salt-assisted deaggregation

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