Microencapsulated phase change materials in solar-thermal conversion systems: understanding geometry-dependent heating efficiency and system reliability

Zhaoliang Zheng, Zhuo Chang, Guangkui Xu, Fiona McBride, Alexandra Ho, Zhuola Zhuola, Marios Michailidis, Wei Li, Rasmita Raval, Riaz Akhtar, Dmitry Shchukin

Research output: Contribution to journalArticle

Abstract

The performance of solar-thermal conversion systems can be improved by incorporation of nanocarbon-stabilized microencapsulated phase change materials (MPCMs). The geometry of MPCMs in the microcapsules plays an important role for improving their heating efficiency and reliability. Yet few efforts have been made to critically examine the formation mechanism of different geometries and their effect on MPCMs-shell interaction. Herein, through changing the cooling rate of original emulsions, we acquire MPCMs within the nanocarbon microcapsules with a hollow structure of MPCMs (h-MPCMs) or solid PCM core particles (s-MPCMs). X-ray photoelectron spectroscopy and atomic force microscopy reveals that the capsule shell of the h-MPCMs is enriched with nanocarbons and has a greater MPCMs-shell interaction compared to s-MPCMs. This results in the h-MPCMs being more stable and having greater heat diffusivity within and above the phase transition range than the s-MPCMs do. The geometry-dependent heating efficiency and system stability may have important and general implications for the fundamental understanding of microencapsulation and wider breadth of heating generating systems.
Original languageEnglish
Pages (from-to)721-729
Number of pages9
JournalACS Nano
Volume11
Issue number1
Early online date21 Dec 2016
DOIs
Publication statusPublished - 24 Jan 2017

Bibliographical note

This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Nano, copyright © American Chemical Society after peer review and technical editing by the publisher.
To access the final edited and published work see http://dx.doi.org/10.1021/acsnano.6b07126

Keywords

  • emulsification
  • encapsulation ratio
  • microencapsulation
  • nanocarbons
  • PF-QNM
  • phase change materials
  • solar-thermal conversion

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    Zheng, Z., Chang, Z., Xu, G., McBride, F., Ho, A., Zhuola, Z., Michailidis, M., Li, W., Raval, R., Akhtar, R., & Shchukin, D. (2017). Microencapsulated phase change materials in solar-thermal conversion systems: understanding geometry-dependent heating efficiency and system reliability. ACS Nano, 11(1), 721-729. https://doi.org/10.1021/acsnano.6b07126