Mechanical Dispersion of Nanoparticles and Its Effect on the Specific Heat Capacity of Impure Binary Nitrate Salt Mixtures

Lasfargues, Mathieu; Qiao, Gang; Cao, Hui; Ding, Yulong

doi:10.3390/nano5031136

Cited by 106 publications

(51 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The present results are different from that of Lasfargues et al [18], of which the optimum ratio of CuO nanoparticles was 0.1 wt %. The deviation may mainly due to different sizes and different production processes of CuO nanoparticles.…”

Section: Figcontrasting

confidence: 99%

“…Introducing nanoparticle into a base fluid to improve its thermophysical properties, termed as 'nanofluid', has been extensively studied in the past [4][5][6][7][8]. Recently, similar concept was used to disperse suitable particles in solar salts to improve their thermal energy storage capacity [9][10][11][12][13][14][15][16][17], hence termed as 'nano-salt' here to consider the dispersion in both solid and liquid phases suitable for TES applications.. A majority of the work [18][19][20][21][22][23][24] showed that the specific heat of nano-salt was increased, except the experimental results of Lu et al [20]. For example, Shin and Banerjee [4] dispersed silica nanoparticles into alkali metal chloride salt eutectics, and reported a c p enhancement of 14.5% at 1 wt % particle concentration.…”

Section: Introductionmentioning

confidence: 99%

“…Ho and Pan [17] showed that a maximum enhancement of specific heat of 19.9% was obtained at 0.063 wt % by dispersing Al 2 O 3 nanoparticles into the Hitec eutectic. Lasfargueset al [18] reported a c p increase of 10.48% at 0.1 wt % by dispersing CuO nanoparticles into a binary mixture of nitrate. Such enhancements are surprising results as the specific heat of the nano-salt should be lower than the base salt, according to the mixture rule as follows [21] …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermal energy storage enhancement of a binary molten salt via in-situ produced nanoparticles

Luo

Awad

et al. 2017

International Journal of Heat and Mass Transfer

View full text Add to dashboard Cite

Thermal energy storage (TES) system is an essential component of any concentrating solar thermal power (CSP) plant to ensure a reliable plant operation even at night or cloudy weather. To enhance the TES capacity, a one-step method was proposed to synthesize nano-salts by in-situ production of CuO nanoparticles, via a high temperature decomposition of copper oxalate, in a binary salt used as a phase change material (PCM). The specific heat of the nano-salt both for solid and liquid phases were measured by differential scanning calorimetry (DSC) with the weight fraction of CuO nanoparticles varied from 0.1 to 3.0 wt %. The maximum specific heat increment of 7.96% in solid phase and 11.48% in liquid phase, were achieved at a CuO nanoparticle concentration of 0.5 wt %. A forming of intermediate layers composing of needle-like structures between nanoparticles and the salt was observed. The mixing model considering such an intermediate layer can be used to explain the observed specific heat enhancement at low particle † Corresponding author. Email address: duxz@ncepu.edu.cn (X. Du); D. Wen@leeds.ac.uk (D. Wen) concentrations. Both latent heat and onset temperature were decreased with increasing concentrations of CuO nanoparticles, while the melting temperature range was increased. When considering both latent heat and sensible heat contributions, the maximum increment of TES was achieved as 4.71% at 0.5 wt % CuO concentration in the temperature range from 160 ºC to 300 ºC.

show abstract

Section: Figcontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thermal energy storage enhancement of a binary molten salt via in-situ produced nanoparticles

Luo

Awad

et al. 2017

International Journal of Heat and Mass Transfer

View full text Add to dashboard Cite

show abstract

“…As a result, the amount of heat ΔH Tp released in the course of resin condensation is considerably reduced. There are a lot of research works on the effect of type, size, dispersion degree and concentration of nanoparticles on the heat capacity of various nanomaterials [36][37][38][39][40]. They all show that nanostructures formed in various materials are responsible for the growth in their heat capacity [38].…”

Section: Resultsmentioning

confidence: 99%

The effect of organofunctional nanosilica on the cross-linking process and thermal resistance of UF resin

Dukarska

Bartkowiak

2016

J Polym Res

View full text Add to dashboard Cite

The paper investigates the effect of surface modification of fumed nanosilica with (3-aminopropyl) triethoxysilane (APTES) on the kinetics and thermal stability of urea-formaldehyde (UF) resin. In the course of the investigation, nanoparticles were modified with APTES in the ratio 1, 2, 3, 4 and 5 part by weight (PBW) per 100 PBW of SiO 2 . The parameters of curing kinetics of the resin, the conversion degree and its thermal stability were determined with use of differential scanning calorimetry (DSC) and thermogravimetric analysis (TG). The effect of nanosilica silanization on the curing process of resin was evaluated by determining the gel time at 100°C and the activation energy (E a ) of the crosslinking process, the initial and final temperature of the reaction (T onset , T endset ), the maximum value of the exothermic peak (T p ), the amount of emitted heat (ΔH Tp ) and the conversion degree (α Tp ) that responds to T p . With the maximum level of silica modification, we have noted a decrease in the reactivity of the resin, which is manifested by a slightly longer gel time of the resin as well as an increase in the value of activation energy of the cross-linking process. It is accompanied by a slight decrease of resin conversion degree α Tp . The modification of silica, regardless of the amount of silane inoculated on its surface, results in the increase in the thermal stability of UF resin.

show abstract

“…Few studies report the production of nanofluids based on molten salt and nanoparticles without water by mixing them with the ball milling procedure (i.e., directly in solid state). In this study [24], a ball-mill with 9 mm stainless steel bearing was used to mix the powder salts and the nanoparticles (CuO and TiO 2 ). With this procedure and materials, the NEPCMs obtained showed higher latent heat (+2.4 and +3.8%) and specific heat.…”

Section: Heat Storage Materialsmentioning

confidence: 99%

Heat Exchange Analysis on Latent Heat Thermal Energy Storage Systems Using Molten Salts and Nanoparticles as Phase Change Materials

Miliozzi¹,

Liberatore²,

Nicolini³

et al. 2018

Advancements in Energy Storage Technologies

View full text Add to dashboard Cite

The increase of carbon dioxide emissions is the most important contributor to climate change. A better use of produced energy, increasing systems efficiency and using renewable sources, can limit them. A key technological issue is to integrate a thermal energy storage (TES). It consists in stocking thermal energy through the heating/cooling of a storage material for future needs. Among various technologies, latent heat TES (LHTES) provides high energy storage density at constant temperature during melting/solidification of storage media. The bottleneck in the use of typical PCMs is their low thermal conductivity. To improve the heat exchange between heat transfer fluid and PCM, three methods are possible and here experimentally analyzed: conductivity systems enhancements; convective flows promotion in liquid phase; and improvement of PCM thermal properties including small amounts of nanoparticles. CFD models were used to evaluate physical phenomena that are crucial for optimized LHTES systems design. The study of the heat exchange mode allowed some useful indications to achieve an optimized LHTES, taking advantage by convective flows and conductivity promotion systems. The use of NEPCM, to maximize the stored energy density and realize compact systems, makes necessary the improvement of its thermal diffusivity. These will be the future research topics.

show abstract

Mechanical Dispersion of Nanoparticles and Its Effect on the Specific Heat Capacity of Impure Binary Nitrate Salt Mixtures

Cited by 106 publications

References 36 publications

Thermal energy storage enhancement of a binary molten salt via in-situ produced nanoparticles

Thermal energy storage enhancement of a binary molten salt via in-situ produced nanoparticles

The effect of organofunctional nanosilica on the cross-linking process and thermal resistance of UF resin

Heat Exchange Analysis on Latent Heat Thermal Energy Storage Systems Using Molten Salts and Nanoparticles as Phase Change Materials

Contact Info

Product

Resources

About