Single-walled carbon nanotube for shape stabilization and enhanced phase change heat transfer of polyethylene glycol phase change material

Qian, Tingting; Li, Jinhong; Feng, Wuwei; Nian, Hongen

doi:10.1016/j.enconman.2017.03.065

Cited by 87 publications

(24 citation statements)

References 22 publications

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“…This result is attributed to the better thermal stability of nanopowder, higher than 1000 K, in comparison to the poly(ethylene glycol). Similar results were also reported in previous studies [ 46 , 47 ].…”

Section: Methodssupporting

confidence: 93%

PEG 400-Based Phase Change Materials Nano-Enhanced with Functionalized Graphene Nanoplatelets

et al. 2017

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This study presents new Nano-enhanced Phase Change Materials, NePCMs, formulated as dispersions of functionalized graphene nanoplatelets in a poly(ethylene glycol) with a mass-average molecular mass of 400 g·mol−1 for possible use in Thermal Energy Storage. Morphology, functionalization, purity, molecular mass and thermal stability of the graphene nanomaterial and/or the poly(ethylene glycol) were characterized. Design parameters of NePCMs were defined on the basis of a temporal stability study of nanoplatelet dispersions using dynamic light scattering. Influence of graphene loading on solid-liquid phase change transition temperature, latent heat of fusion, isobaric heat capacity, thermal conductivity, density, isobaric thermal expansivity, thermal diffusivity and dynamic viscosity were also investigated for designed dispersions. Graphene nanoplatelet loading leads to thermal conductivity enhancements up to 23% while the crystallization temperature reduces up to in 4 K. Finally, the heat storage capacities of base fluid and new designed NePCMs were examined by means of the thermophysical properties through Stefan and Rayleigh numbers. Functionalized graphene nanoplatelets leads to a slight increase in the Stefan number.

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Section: Methodssupporting

confidence: 93%

PEG 400-Based Phase Change Materials Nano-Enhanced with Functionalized Graphene Nanoplatelets

et al. 2017

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“…As a typical organic PCM, polyethylene glycol (PEG) has been confirmed to be a promising material and has received wide attention due to characteristics such as excellent latent heat capacity, suitable melting temperature, and prominent chemical stability [ 9 , 10 ]. However, low heat conductivity as well as the problem of liquid leakage during phase transitions have become the two major shortcomings of PEG that limit its applications to a certain extent [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Cost-Effective Biochar Produced from Agricultural Residues and Its Application for Preparation of High Performance Form-Stable Phase Change Material via Simple Method

Chen

Cui

Ding

et al. 2018

IJMS

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A new form-stable composite phase change material (PEG/ASB) composed of almond shell biochar (ASB) and polyethylene glycol (PEG) was produced via a simple and easy vacuum impregnation method. The supporting material ASB, which was cost effective, environmentally friendly, renewable and rich in appropriate pore structures, was produced from agricultural residues of almond shells by a simple pyrolysis method, and it was firstly used as the matrix of PEG. Different analysis techniques were applied to investigate the characteristics of PEG/ASB, including structural and thermal properties, and the interaction mechanism between ASB and PEG was studied. The thermogravimetric analysis (TGA) and thermal cycle tests demonstrated that PEG/ASB possessed favorable thermal stability. The differential scanning calorimetry (DSC) curves demonstrated that the capacities for latent heat storage of PEG/ASB were enhanced with increasing PEG weight percentage. Additionally, PEG/ASB had an excellent thermal conductivity of 0.402 W/mK, which was approximately 1.6 times higher than that of the pure PEG due to the addition of ASB. All the study results indicated that PEG/ASB had favorable phase change properties, which could be used for thermal energy storage.

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“…PEG is used in its bulk form, which undergoes solid–liquid phase transition, or in shape‐stabilized form, which undergoes solid–solid phase transition to avoid leakage. Various porous material can act as form stabilizer, such as porous carbon materials, clay mineral, and mesoporous matrices, to prepare shape stabilized (ie, form stable) PEG PCMs. Another way for preparation of PEG‐based form‐stable PCMs (FSPCMs) is chemical crosslinking …”

Section: Introductionmentioning

confidence: 99%

“…The results show that the supercooling degree drops by up to 6.1°C. Qian et al used single‐walled carbon nanotubes (SWCNs) to adsorb PEG via a facile impregnation method. According to the differential scanning calorimetry (DSC) results, at 10% loading of SWCNs, the supercooling degree drops by 7.39°C.…”

Section: Introductionmentioning

confidence: 99%

End group modification of polyethylene glycol (PEG): A novel method to mitigate the supercooling of PEG as phase change material

et al. 2018

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Summary Polyethylene glycol (PEG) is a kind of phase change material with high phase change enthalpy and good compatibility with the environment. However, there is relatively large supercooling for PEG, limiting their practical applications. To reduce their supercooling degree, herein we use three different small molecules (acryloyl chloride, acetyl chloride, and thionyl chloride) to modify PEG and study the effects of different end group modification on their phase change properties. Fourier‐transform infrared (FTIR) and proton nuclear magnetic resonance (1H‐NMR) spectroscopy are used to confirm the molecular structure of the PEG with different molecular weights and functionalities after chemical modification. Crystal structures of the PEG before and after the modification are verified by X‐ray diffractometry (XRD) method and show no change. Differential scanning calorimetry (DSC) results show that the end group modification is quite effective for mitigating the supercooling of PEG with double ‐OH end groups but not effective for PEG with mono ‐OH end group. The mechanism for the change of supercooling behavior is proposed. The costs of different modification methods are estimated and compared.

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Single-walled carbon nanotube for shape stabilization and enhanced phase change heat transfer of polyethylene glycol phase change material

Cited by 87 publications

References 22 publications

PEG 400-Based Phase Change Materials Nano-Enhanced with Functionalized Graphene Nanoplatelets

PEG 400-Based Phase Change Materials Nano-Enhanced with Functionalized Graphene Nanoplatelets

Cost-Effective Biochar Produced from Agricultural Residues and Its Application for Preparation of High Performance Form-Stable Phase Change Material via Simple Method

End group modification of polyethylene glycol (PEG): A novel method to mitigate the supercooling of PEG as phase change material

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