Electrostatic interaction-based self-assembly of paraffin@graphene microcapsules with remarkable thermal conductivity for thermal energy storage

Yongli, Guo; Yang, Wenbin; Xie, Changsheng; Wu, Juying; Zhang, Kai

doi:10.1080/1536383x.2018.1517754

Cited by 30 publications

(11 citation statements)

References 34 publications

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“…Graphene, which is a two-dimensional nanoplate with high-thermal conductivity and relatively large specific surface area, has been widely studied and applied in recent years as nanomaterials. 71 Guo et al 72 prepared MEPCMs by using graphene as shell material and paraffin as core material by self-assembly method. It was found that the microcapsules were totally spherical and had a latent heat of more than 200 J/g.…”

Section: Microencapsulation Of Pcms With Inorganic Shellsmentioning

confidence: 99%

Construction strategies and thermal energy storage applications of shape‐stabilized phase change materials

Yan

Wang

et al. 2021

J of Applied Polymer Sci

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Phase change materials (PCMs) are usually used in latent thermal energy storage systems to address the mismatch between heat energy supply and demand, due to their high energy storage density, high-latent heat, and almost constant temperature during phase change process. However, the low-thermal conductivity of PCMs and severe leakage during phase change limit their practical applications. Thus, extensive efforts have been devoted to constructing shapestabilized PCMs (SSPCMs). In this review, recent advances of the construction strategies and thermal energy storage applications of SSPCMs are summarized. Especially, the microencapsulated PCMs, SSPCMs based on porous scaffolds, as well as their potential applications are highlighted. Finally, the future perspectives and remaining challenges in this research field are prospected.

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Section: Microencapsulation Of Pcms With Inorganic Shellsmentioning

confidence: 99%

Construction strategies and thermal energy storage applications of shape‐stabilized phase change materials

Yan

Wang

et al. 2021

J of Applied Polymer Sci

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“…Comparison of thermal conductivity enhancement of graphene/paraffin composites (■ [47] ● [46] ▲ [49] ▼ [50] ► [33] ◆ [51] ★ [34] □ [52] ○ [53]).…”

Section: Figurementioning

confidence: 99%

Preparation of Anisotropic Aerogels with Pristine Graphene by Heat Flow and Study of Their Effects on Heat Transfer in Paraffin

Huang‬‬‬‬

Zhang

et al. 2019

Nanomaterials

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In this study, anisotropic graphene/graphene oxide (GO) aerogels (AGAs) were obtained by freeze-drying after direct participation of pristine graphene in the self-assembly of anisotropic gel by the heat flow method. After vacuum microwave treatment, the physical, chemical and structural characteristics of the AGAs were investigated. The results show that AGAs, in which the internal graphene sheets are parallel to the heat flow direction, are successfully prepared. After microwave treatment, the amount of oxygen and nitrogen reduces significantly and the sp2 domain increases. However, at the same time, many fragments and holes are generated in the graphene sheets. The effects of AGAs on the phase transition of paraffin is studied, and the results show that the melting enthalpy, solidification enthalpy and initial melting temperature of AGA/paraffin composites decreases as the GO content in the AGAs increases, whereas the melting range, solidifying range and subcooling degree increases. The highest axial thermal conductivity of the AGA/paraffin composite is 1.45 W/(mK), and the thermal conductivity enhancement efficiency is 884% (AGA content was 0.53 vol %). Compared with previously investigated, similar AGA/paraffin composites, the aerogels fabricated in this study have the obvious advantages of a simple fabrication process, a low cost and a high thermal conductivity enhancement efficiency. These aerogels possess the potential for application in phase-change energy storage (PES), thermal energy management and other fields.

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“…Among them, latent heat storage is a relatively new research field that can improve energy utilization. It uses phase change material (PCM) with high heat-density (Rathod and Banerjee, 2013) and high-latency (Tian et al , 2017) to achieve thermal energy storage, such as paraffin (Ying et al , 2018; Guo et al , 2018), fatty acids (Yang et al , 2019) and hydrated salts (Zhang et al , 2011). In addition, PCM has excellent chemical compatibility, thermal stability and a wide range of phase transition temperatures (Zhao et al , 2019).…”

Section: Introductionmentioning

confidence: 99%

Paraffin/graphene sponge composite as a shape-stabilized phase change material for thermal energy storage

Chen

Peng

et al. 2020

PRT

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Purpose This paper aims to study the synergistic effect of graphene sponge on the thermal properties and shape stability of composite phase change material (PCM). Design/methodology/approach Graphene oxide sponge is first prepared from an aqueous solution of graphene oxide by freeze-drying method. The oxidized graphene sponge is reduced by hydrazine hydrate. Finally, use vacuum impregnation method to introduce paraffin into graphene sponge to prepare composite PCM. Findings Graphene sponge is used to improve the shape stability of paraffin wax and improves the thermal conductivity and latent heat of the composite PCM. The thermal conductivity increases by 200 per cent and the composite PCM has excellent reliability in 100 melt-freezing cycles. Research limitations/implications A simple way for fabricating composite PCM with high thermal conductivity and latent heat which has the potential to be used as thermal storage materials without container encapsulation has been developed by using graphene sponge and paraffin. Originality/value The materials and preparation methods with special structure and properties in this paper provide a new idea for the research of PCM, which can be widely used in the fields of energy conversion and storage.

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Electrostatic interaction-based self-assembly of paraffin@graphene microcapsules with remarkable thermal conductivity for thermal energy storage

Cited by 30 publications

References 34 publications

Construction strategies and thermal energy storage applications of shape‐stabilized phase change materials

Construction strategies and thermal energy storage applications of shape‐stabilized phase change materials

Preparation of Anisotropic Aerogels with Pristine Graphene by Heat Flow and Study of Their Effects on Heat Transfer in Paraffin

Paraffin/graphene sponge composite as a shape-stabilized phase change material for thermal energy storage

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