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Novel facile self-assembly approach to construct graphene oxide-decorated phase change microcapsules with enhanced photo-to-thermal conversion performance

Abstract

In this work, a self-assembled and graphene oxide (GO) modified microcapsules of paraffin @ mixed cellulose was prepared. The microstructure and morphology of the as-prepared phase change composite were characterized by a polarizing microscope, SEM, FT-IR, XRD, Raman spectrum. The results show that the paraffin@ ethylcellulose (EC)/methylcellulose (MC)/GO composite consists of spherical-like particles which have core@ shell structure, which is the absence of chemical reactions between the core (i.e., paraffin) and shell (i.e., EC/MC/GO) materials. The melting temperature (i.e., 49.7 ℃) and latent heat (i.e., 152.2 J﹒g-1) of the araffin@ EC/MC/GO composite were characterized by DSC. The encapsulation rate of paraffin in the composite can be as much as 85.4% based on the results of the DSC measurement. The as-prepared paraffin@ EC/MC/GO composite has no leakage which is observed by SEM, as well as can possess its phase change capability perfectly after experiencing 100 melting−freezing cycles. Furthermore, the microencapsulation was dispersed into the base fluid (i.e., water) to form a stable suspension, which shows enhanced photo-thermal conversion performance with temperature increases from 30 to 80 ℃. The efficiency of paraffin@ EC/MC/GO-based phase change slurry maintains 80% in a wide temperature range compared with that of paraffin@ EC/MC-based phase change slurry. The paraffin@ EC/MC/GO composite with high thermal storage capacity, good thermal reliability and enhanced photothermal performance exhibit a good potential for using as a solar thermal storage material in practical applications.

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Publication details

The article was received on 08 Jan 2018, accepted on 07 Feb 2018 and first published on 09 Feb 2018


Article type: Paper
DOI: 10.1039/C8TA00215K
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Novel facile self-assembly approach to construct graphene oxide-decorated phase change microcapsules with enhanced photo-to-thermal conversion performance

    K. Yuan, J. Liu, X. Fang and Z. Zhang, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA00215K

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