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

Usoltseva, Liliya O.; Volkov, Dmitry S.; Авраменко, Н. В.; Korobov, M.V.; Проскурнин, М. А.

doi:10.17586/2220-8054-2018-9-1-17-20

Cited by 4 publications

(5 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this case, a rough estimation for the RDDM gives the value no higher than 30 W m −1 K −1 . On the other hand, concentrated dispersions (50 mg mL −1 and above), for which the thermal conductivity is significantly different from the base fluid, as shown previously [ 25 ], have high viscosity values (from 1.5 times higher than that of water). It is noteworthy that the relative increase in dynamic viscosity compared to the base fluid can exceed the increase in thermal conductivity by no more than four times, in which case the addition of nanoparticles is practical [ 26 ].…”

Section: Resultsmentioning

confidence: 62%

“…However, it is problematic to compare thermal conductivity data to the starting nanodiamond materials as they are powders with different size distributions, porosity, and purity. Therefore, only for estimation, the paste-specimen cell was used for the RUDDM and RDDM powder measurements (we estimated the nanodiamond relative density—the ratio of the apparent density of the powder to the solid bulk [ 15 , 25 ]—as 15–17%, so the porosity was 83–85%). At 25 °C, the thermal conductivity was 0.26 ± 0.03 and 0.35 ± 0.04 W m −1 K −1 , respectively, which was consistent with the existing data [ 31 ].…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

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

Usoltseva

Volkov

Karpushkin

et al. 2021

Gels

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 62%

Section: Resultsmentioning

confidence: 99%

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

Usoltseva

Volkov

Karpushkin

et al. 2021

Gels

View full text Add to dashboard Cite

show abstract

“…An analysis of the existing data has shown that, in many cases, the presence of carbon nanomaterials in large quantities (mg/mL level) increases the thermal conductivity of the dispersion [ 28 , 84 , 85 , 86 ]. As previously shown [ 27 , 78 , 87 , 88 , 89 , 90 ], an increase in the GO concentration leads to an increase in k of the dispersion, which is the main reason for the increase in thermal diffusivity.…”

Section: Discussionmentioning

confidence: 99%

The Thermophysical and Physicochemical Properties of the Aqueous Dispersion of Graphene Oxide Dual-Beam Thermal Lens Spectrometry

et al. 2023

View full text Add to dashboard Cite

Modern heat-conducting materials require special attention to analyze their thermophysical properties. Compared to classical methods, thermal lens spectrometry (TLS) has advantages due to its high sensitivity to physical and chemical composition. To avoid a systematic error in the analysis of complex systems, it is necessary to realize the limits of the applicability of the method. This study considers the features of thermal-diffusivity measurements by TLS in the stationary state for dispersed systems with absorbances up to 0.05. The limits of applicability of the method in analyzing heterogeneous systems are shown, and a mathematical apparatus is proposed for indicating a systematic error in finding thermal diffusivity that does not exceed 1%. Graphene oxide (GO), which has attractive physicochemical properties, was used as the object of analysis. GO belongs to 2D objects, the study of which requires highly sensitive methods and special attention when discussing the results. The thermophysical properties of aqueous dispersions of graphene oxide in a wide range of concentrations (up to 2 g/L) and lateral sizes (up to 4 µm) were studied by TLS. It has been found that with increasing nanophase concentration, the thermal diffusivity of graphene oxide dispersions passes through a minimum, which can be used in solving thermal insulation problems. It has been established that prolonged laser irradiation of the dispersion leads to a change in thermal diffusivity, which indicates the photochemical reduction of graphene oxide.

show abstract

“…The rarefied gas nanosuspension is a special case of a nanofluid. Nanofluids with spherical nanoparticles and carbon nanotubes have already been successfully used or are proposed for use in various applications (see for example [32][33][34][35]). The model of the viscosity of coarse dispersed fluid was developed by Einstein [36] and then generalized by many authors (see [37][38][39][40] and references therein).…”

Section: Modeling the Transport Processes In Rarefied Gas Nanosuspensionsmentioning

confidence: 99%

Stochastic molecular modeling the transport coefficients of rarefied gas and gas nanosuspensions

Rudyak

Lezhnev

2020

Nanosystems: Phys. Chem. Math.

View full text Add to dashboard Cite

The subject of this paper is the stochastic molecular modelling of the transport coefficients for rarefied gases and gas nanosuspensions. The proposed method is an alternative one to the molecular dynamics method. However, unlike the latter, the phase trajectories of the molecular system are simulated stochastically. Adequate integral characteristics of the studied system are obtained by averaging the calculated data over independent phase trajectories. The efficiency of the proposed algorithm is demonstrated by calculation of the diffusion and viscosity coefficients of several noble and polyatomic gases and rarefied gas nanosuspensions. The modeling accuracy increases when a greater number of molecules and phase trajectories are employed.

show abstract

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

Cited by 4 publications

References 21 publications

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

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

The Thermophysical and Physicochemical Properties of the Aqueous Dispersion of Graphene Oxide Dual-Beam Thermal Lens Spectrometry

Stochastic molecular modeling the transport coefficients of rarefied gas and gas nanosuspensions

Contact Info

Product

Resources

About