Enhanced thermal properties for nanoencapsulated phase change materials with functionalized graphene oxide (FGO) modified PMMA

Zhou, Jianhua; Zhao, Jiaojiao; Li, Hong; Cui, Yanjiao; Li, Xiang

doi:10.1088/1361-6528/ab898b

Cited by 11 publications

(3 citation statements)

References 60 publications

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“…However, due to the inherently low thermal conductivity of PCM, it is a challenge to achieve efficient heat dissipation in temperature management, which limits their further engineering applications [ 17 , 18 ]. To address this drawback, various methods have been developed to improve the thermal conductivity of PCM, including inserting metal fins [ 19 , 20 ], adding high thermal conductivity nanoparticles [ 21 ], embedding metal foams [ 22 , 23 ] and microencapsulating [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

Thermal Performance of Heat Sink Filled with Double-Porosity Porous Aluminum Skeleton/Paraffin Phase Change Material

Huang,

Long,

et al. 2024

Micromachines

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Phase change materials (PCMs) are used to cool high-power-density electronic devices because of their high latent heat and chemical stability. However, their low thermal conductivity limits the application of PCMs. To solve this problem, a double-porosity porous aluminum skeleton/paraffin phase change materials (DPAS/PCM) was prepared via additive manufacturing and the water-bath method. The thermal performance of the DPAS/PCM heat sink (HS) was experimentally investigated to examine the effects of the positive- and reverse-gradient porosity structures of the DPAS/PCM. The results show that a positive-gradient porosity arrangement is more conducive to achieving a low-temperature cooling target for LED operation. In particular, the temperature control time for the positive gradient porosity structure increased by 4.6–13.7% compared with the reverse gradient porosity structure. Additionally, the thermal performances of uniform porous aluminum skeleton/paraffin (UAS) and DPAS/PCMs were investigated. The temperature control effect of the DPAS/PCM was better than that of the UAS/PCM HS at high critical temperatures. Compared with the UAS/PCM HS, the temperature control time of the DPAS/PCM HS is increased by 7.8–12.5%. The results of this work show that the prepared DPAS/PCM is a high-potential hybrid system for thermal management of high-power electronic devices.

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Section: Introductionmentioning

confidence: 99%

Thermal Performance of Heat Sink Filled with Double-Porosity Porous Aluminum Skeleton/Paraffin Phase Change Material

Huang,

Long,

et al. 2024

Micromachines

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“…The dispersion of GO in PEG is closely related to its degree of oxidation [ 14 ]. It was found that the modification of GO using surface modifiers resulted in better binding to PEG and improved its dispersion properties as well as its crystal structure [ 15 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of GO on the Structure and Properties of PEG/Biochar Phase Change Composites

et al. 2023

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In recent years, phase change materials (PCMs) have been widely used in waste heat utilization, buildings, and solar and wind energy, but with a huge limitation from the low thermal conductivity, photothermal conversion efficiency, and low latent heat. Organic PCMs are eyecatching because of its high latent heat storage capability and reliability, but they still suffer from a lack of photothermal conversion and sharp stability. Here, we prepared sharp-stable PCMs by establishing a carbon material frame system consisting of graphene oxide (GO) and biochar. In particular, surfactants (CTAB, KH-560 and KH-570) were employed to improve the dispersity of GO in PEG. The differential scanning calorimetry results shows that the latent heat of PEG modified by CTAB grafted GO (PGO-CTAB) was the highest (191.36 J/g) and increased by 18.31% compared to that of pure PEG (161.74 J/g). After encapsulation of PGO-CTAB in biochar, the obtained composite PCM with the amount of biochar and PGO-CTAB in weight ratio 4:6 (PGO-CTAB/CS6(6)) possesses relatively high latent heat 106.51 J/g with good leak resistance and thermal stability, and with obviously enhanced thermal conductivity (0.337 W/(m·K)) and photothermal conversion efficiency (77.43%), which were higher than that of PEG6000 (0.325 W/(m·K), 44.63%). The enhancement mechanism of heat transfer and photothermal conversion on the composite PCM is discussed.

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“…The multilayer microcapsules not only had a thermal energy storage property, but also possessed UV-shielding functions. Zhou et al [29] used functionalized graphene oxide (FGO) as a Pickering emulsifier to prepare phase-change nano-capsules with PMMA/FGO hybrid shells via surfactant-free emulsion polymerization. The results indicated that the latent enthalpy, thermal conductivity and thermal stability of the nano-capsules were effectively improved in the PMMA-NanoPCMs modified with FGO.…”

Section: Introductionmentioning

confidence: 99%

Paraffin@poly(methyl methacrylate) Phase Change Microcapsules for Thermal Energy Storage and Temperature Regulation

Jiang

et al. 2023

ChemistrySelect

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A series of paraffin@poly(methyl methacrylate) phase‐change microcapsules (Pn@PMMA) were synthesized by suspension polymerization. The prepared Pn@PMMA had excellent latent heat storage and release properties (ΔHm=183.2 J/g, ΔHc=181.9 J/g), excellent thermal stability and cycle durability of at least 100 cycles. The effects of emulsifier type, cross‐linking agent content and core/shell mass ratio on structure and properties of Pn@PMMA were investigated by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT‐IR) and differential scanning calorimetry (DSC). The morphology of Pn@PMMA exhibited spherical profile with styrene‐maleic anhydride (SMA) as emulsifier and the agglomeration was significantly reduced. The enthalpy of the microcapsules was significantly improved with the addition of crosslinker. The anti‐permeability of Pn@PMMA subsequently further improved with continued increasing amount of cross‐linker. Besides, the enthalpy and anti‐leaking property of the microcapsules progressively reduced with the core/shell mass ratio decreased, while the thermal conductivity gradually increased. Therefore, the results showed that the Pn@PMMA with the enthalpy of 183.2 J/g and the leakage rate of 4.72 %, which displayed a high thermal reliability potential for thermal energy storage and temperature regulation.

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Enhanced thermal properties for nanoencapsulated phase change materials with functionalized graphene oxide (FGO) modified PMMA

Cited by 11 publications

References 60 publications

Thermal Performance of Heat Sink Filled with Double-Porosity Porous Aluminum Skeleton/Paraffin Phase Change Material

Thermal Performance of Heat Sink Filled with Double-Porosity Porous Aluminum Skeleton/Paraffin Phase Change Material

Effect of GO on the Structure and Properties of PEG/Biochar Phase Change Composites

Paraffin@poly(methyl methacrylate) Phase Change Microcapsules for Thermal Energy Storage and Temperature Regulation

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