Novel segregated-structure phase change materials composed of paraffin@graphene microencapsules with high latent heat and thermal conductivity

Yang, Wenbin; Zhang, Li; Yongli, Guo; Jiang, Zhuoni; He, Fangfang; Xie, Changsheng; Fan, Jinghui; Wu, Juying; Zhang, Kai

doi:10.1007/s10853-017-1693-2

Cited by 66 publications

(30 citation statements)

References 28 publications

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“…In recent years, people have taken some measures and solutions to these problems. Among them, the two measures of adding high thermal conductivity materials and microencapsulation technology are most used to solve a series of problems of microcapsules 11‐16 . Expanded graphite, 17 carbon nanotubes, 18 and graphene flakes 19 have been reported to be mixed with PCMs to make high thermal conductivity PCMs.…”

Section: Introductionmentioning

confidence: 99%

Core@double‐shell structured multifunctional phase change microcapsules based on modified graphene oxide Pickering emulsion

Wei

Yang

et al. 2020

Int J Energy Res

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Summary New multifunctional phase change microcapsules with paraffin (Pn) as core and GO and lead tungstate (PbWO4) as double‐shell were designed by modified GO Pickering emulsion, and the effect of GO content on Pn@GO@PbWO4 microcapsules was studied. The morphology, chemical composition, and structure of Pn@GO@PbWO4 microcapsules were characterized, and their performance was studied in depth. The Pn@GO@PbWO4 microcapsules had a dense shell and a regular spherical structure. Compared with microcapsules without GO addition, the resultant Pn@GO@PbWO4 microcapsules could demonstrate high phase change reliability and thermal stability. Most of all, the anti‐seepage performance had been greatly improved by 67.27%. The results of contact angle (CA) measurement and gamma‐ray shielding test showed that the GO and PbWO4 double‐shell multifunctional microcapsules with superhydrophobic property and good gamma‐ray shielding property and high anti‐seepage performance had great attraction in expanding the application field of phase change materials.

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Section: Introductionmentioning

confidence: 99%

Core@double‐shell structured multifunctional phase change microcapsules based on modified graphene oxide Pickering emulsion

Wei

Yang

et al. 2020

Int J Energy Res

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“…SEM uses a higher energy beam of electron on the surface of the sample, which generates various signals showing the image of the sample surface. These variety of signals reveal the various characteristics information of the sample including topography (the surface features or texture), morphology (the shape and size), composition (elements and compounds) and crystallography (atoms arrangement) . Various research has presented SEM images to represent chemical composition, morphology, and crystallography of EPCMs, as mentioned in Table .…”

Section: Characteristics Evaluation Techniques Of Epcmsmentioning

confidence: 99%

The micro‐/nano‐PCMs for thermal energy storage systems: A state of art review

et al. 2019

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Summary With advancement in technology—nanotechnology, various thermal energy storage (TES) materials have been invented and modified with promising thermal transport properties. Solid‐liquid phase change materials (PCMs) have been extensively used as TES materials for various energy applications due to their highly favourable thermal properties. The class of PCMs, organic phase change materials (OPCMs), has more potential and advantages over inorganic phase change materials (IPCMs), having high phase change enthalpy. However, OPCMs possess low thermal conductivity as well as density and suffer leakage during the melting phase. The encapsulation technologies (ie, micro and nano) of PCMs, with organic and inorganic materials, have a tendency to enhance the thermal conductivity, effective heat transfer, and leakage issues as TES materials. The encapsulation of PCMs involves several technologies to develop at both micro and nano levels, called micro‐encapsulated PCMs (micro‐PCM) and nano‐encapsulated PCMs (nano‐PCM), respectively. This study covers a wide range of preparation methods, thermal and morphological characteristics, stability, applications, and future perspective of micro‐/nano‐PCMs as TES materials. The potential applications, such as solar‐to‐thermal and electrical‐to‐thermal conversions, thermal management, building, textile, foam, medical industry of micro‐ and nano‐PCMs, are reviewed critically. Finally, this review paper highlights the emerging future research paths of micro‐/nano‐PCMs for thermal energy storage.

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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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Novel segregated-structure phase change materials composed of paraffin@graphene microencapsules with high latent heat and thermal conductivity

Cited by 66 publications

References 28 publications

Core@double‐shell structured multifunctional phase change microcapsules based on modified graphene oxide Pickering emulsion

Core@double‐shell structured multifunctional phase change microcapsules based on modified graphene oxide Pickering emulsion

The micro‐/nano‐PCMs for thermal energy storage systems: A state of art review

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

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