Evaluation of copper nanoparticles – Paraffin wax compositions for solar thermal energy storage

Lin, Saw Chun; Al-Kayiem, Hussain H.

doi:10.1016/j.solener.2016.03.004

Cited by 245 publications

(59 citation statements)

References 39 publications

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“…Among various types of nanoparticles, copper and copper oxide nanoparticles attract much attention because of their distinguished catalytic, mechanical, magnetic, electric and thermal properties; in addition to their versatile applicability in many fields including agricultural, industrial, environmental and medical applications [2]. Furthermore, copper and copper oxide nanoparticles can be used in catalysis [3], sensors [4], degradation of dyes [5], fungicidal [6,7] and nematicidal [8] applications.…”

Section: Introductionmentioning

confidence: 99%

Green synthesis of copper & copper oxide nanoparticles using the extract of seedless dates

Mohamed

2020

Heliyon

117

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In the last few years, copper and copper oxide nanoparticles were involved in many applications; this encouraged many researchers worldwide to develop more facile synthesis methods. Unprecedentedly, the current study reports a green method for synthesizing copper/copper oxide nanoparticles (Cu/Cu 2 O NPs) using the extract of seedless dates. Cu/Cu 2 O NPs were synthesized according to the chemical reduction method using seedless dates' extract as a reducing agent due to its high content of phenolics and flavonoids. Transmission Electron Microscopy (TEM) revealed that roughly spherical particles were synthesized. Dynamic Light Scattering (DLS) showed that the synthesized Cu/Cu 2 O NPs have an average particle size of 78 nm and zeta potential of þ41 mV, indicating a good stability of the particles. Successful synthesis of Cu/Cu 2 O NPs was affirmed through both X-Ray Diffraction (XRD), which revealed the presence of the characteristic peaks of copper at 2θ ¼ 43.2745, 50.4083 and 74.1706 , and UV-Vis. Spectroscopy, which revealed the surface plasmonic resonance peak characterizes Cu/Cu 2 O NPs at 576 nm. In addition, Fourier Transform Infrared Spectroscopy (FTIR) revealed the presence of phenolic compounds, which were responsible for reducing copper ions into copper nanoparticles through their carbonyl and hydroxyl linkages, adsorbed from the extract on Cu/Cu 2 O NPs. Conclusively, the current work provides, for the first time, a simple, cost-effective and environmentally friendly method for synthesizing Cu/Cu 2 O NPs using useless seedless dates.

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Section: Introductionmentioning

confidence: 99%

Green synthesis of copper & copper oxide nanoparticles using the extract of seedless dates

Mohamed

2020

Heliyon

117

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“…found that the incorporation of in situ formed silver nanoparticles into n ‐hexadecane microcapsules led to enhanced thermal conductivity from 0.0557 to 0.1231 W m/K compared to those of the pure PCM microcapsules. In another study, it was reported that the use of 2.0 wt % copper nanoparticle in paraffin PCM increased the thermal conductivity of PCM by about 46.3% . Tang et al .…”

Section: Resultsmentioning

confidence: 98%

“…It was clear that when the concentration of both copper acetate as the metal precursor and ascorbic acid as the reducing agent increased, more nanoparticles formed and were loaded onto the composite; this resulted in a higher thermal conductivity for sample 2 compared to that of sample 1. In fact, embedding copper nanoparticles with a higher thermal conductivity than that of PA–LA fatty acid PCMs resulted in a higher thermal conductivity of copper‐containing composites . The loaded copper nanoparticles further decreased the possible supercooling effects of samples 1 and 2 because they acted as a nucleating agent in the PA–LA–PET composites .…”

Section: Resultsmentioning

confidence: 99%

“…formed and loaded silver nanoparticles in situ into n ‐hexadecane and n ‐octadecane microcapsules to promote the thermal conductivity of the PCMs. In the case of the use of copper‐based nanoparticles, the thermal conductivity of PA and paraffin wax PCMs was considerably increased by the embedding of the nanoparticles . Moreover, fatty acid PCMs are used in a eutectic form to expand their phase‐change temperature range and for better performance in engineering applications …”

Section: Introductionmentioning

confidence: 99%

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In situ incorporation and loading of copper nanoparticles into a palmitic–lauric phase‐change material on polyester fibers

Rezaie

Montazer

2018

J of Applied Polymer Sci

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This article introduces a facile approach for applying a eutectic mixture of fatty acid phase-change materials (PCMs) on polyester fibers for thermal conductivity improvement via the in situ incorporation of copper nanoparticles. For this purpose, a eutectic mixture of palmitic acid and lauric acid was applied as PCMs and ascorbic acid was applied for the synthesis of copper nanoparticles. The thermal properties and stability of the treated samples were also determined by differential scanning calorimetry and thermogravimetry analysis. The treated samples indicated appropriate phase-transition temperatures between 29.1 and 36.8 C, with relevant latent heats of 49.4 and 49.9 J/g, respectively. The in situ formation of copper nanoparticles into eutectic fatty acid applied on the polyester fibers resulted in the promotion of the thermal conductivity of the composite by about 100.1% with the maximum amount of nanoparticles. In addition, the treated samples maintained good thermal durability and stability after 100 melting and freezing cycles. In addition, the tensile strength of the treated samples was improved. Overall, this treatment could be used to produce promising form-stabilized composite PCMs and thermoregulated polymers and textiles with appropriate phase-transition ranges and thermal conductivity.

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“…Physical structures such as fins enhance the heat transfer by increasing the relative surface area in contact with PCM . The thermal conductivity of the PCMs can also be improved by using highly conducting additives such as metallic and ceramic nanoparticles such as Cu, Fe 3 O 4 , Al 2 O 3 , TiO 2 , SiO 2 , ZnO etc . Introduction of carbon‐based fillers such as carbon fibers, carbon nanotubes (CNT), graphene, and graphite flakes have also been studied.…”

Section: Introductionmentioning

confidence: 99%

Thermally Conducting Microcellular Carbon Foams as a Superior Host for Wax‐Based Phase Change Materials

2019

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Thermally conducting microcellular carbon foams are prepared from sucrose with graphite as a filler using an economical, scalable, and sustainable NaCl particle templating technique. The effect of graphite filler and NaCl template loading on density, porosity, thermal conductivity, and microstructure are carefully investigated. Conducting carbon foams (CCF) exhibit high porosity (76.1 to 93.4%) and adequate compressive strength (0.225 to 14.96 MPa). The high thermal conductivity (0.282 to 5.23 W m À1 K À1 ), interconnected microcellular structure (cell size 2-12 μm), and hydrophobic nature make the foams ideal for hosting wax-based phase change materials for thermal energy storage and management applications. Composites of conducting carbon foam and paraffin wax (PW) are prepared with various wax loadings (50.5 to 82.6 wt%), which exhibit thermal conductivities in the range of 0.65-7.72 W m À1 K À1 . The melting and freezing characteristics and form stability of the composites are also studied. It is established that the microcellular structure is advantageous for easy wax-impregnation and retention during thermal cycling compared to macrocellular (cell size of 600 μm) foams of the similar composition due to the enhanced capillary forces. Differential scanning calorimetry (DSC) study of PW/CCF composites shows the highest melting enthalpy of 110.9 J g À1 .

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Evaluation of copper nanoparticles – Paraffin wax compositions for solar thermal energy storage

Cited by 245 publications

References 39 publications

Green synthesis of copper & copper oxide nanoparticles using the extract of seedless dates

Green synthesis of copper & copper oxide nanoparticles using the extract of seedless dates

In situ incorporation and loading of copper nanoparticles into a palmitic–lauric phase‐change material on polyester fibers

Thermally Conducting Microcellular Carbon Foams as a Superior Host for Wax‐Based Phase Change Materials

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