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Synthesis and characterisation of n-octacosane@silica nano-capsules for thermal storage applications

Sebastia-Saez, Daniel, Ramirez Reina, Tomas, Silva, Ravi and Arellano-Garcia, Harvey (2019) Synthesis and characterisation of n-octacosane@silica nano-capsules for thermal storage applications International Journal of Energy Research.

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Abstract

This work reports the synthesis and characterisation of a core-shell n-octacosane@silica nano-encapsulated phase-change material obtained via interfacial hydrolysis and poly-condensation of tetraethyl orthosilicate in mini-emulsion. Silica has been used as the encapsulating material because of its thermal advantages relative to synthesised polymers. The material presents excellent heat storage potential, with a measured latent heat varying between 57.1 and 89 kJ∙kg-1 (melting point between 58 and 64°C) and a small particle size (between ~565 and ~227 nm). Degradation of the n-octacosane core starts between 150 and 180°C. Also, the use of silica as shell material gives way to a heat conductivity of 0.796 W∙m-1∙K-1 (greater than that of nano-encapsulated materials with polymeric shell). Charge/discharge cycles have been successfully simulated at low pressure to prove the suitability of the nano-powder as phase-change material. Further investigations will be carried out in the future regarding the use of the synthesised material in thermal applications involving nanofluids.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
NameEmailORCID
Sebastia-Saez, Danielj.sebastiasaez@surrey.ac.uk
Ramirez Reina, Tomast.ramirezreina@surrey.ac.uk
Silva, RaviS.Silva@surrey.ac.uk
Arellano-Garcia, Harveyh.arellano-garcia@surrey.ac.uk
Date : 2019
Funders : EPSRC - Engineering and Physical Sciences Research Council
Copyright Disclaimer : © John Wiley & Sons Ltd
Uncontrolled Keywords : Nano-encapsulation; Thermal energy storage; Phase-change material; n-octacosane; Silica shell
Depositing User : Diane Maxfield
Date Deposited : 19 Nov 2019 10:22
Last Modified : 19 Nov 2019 10:22
URI: http://epubs.surrey.ac.uk/id/eprint/853173

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