Highly Stable Energy Capsules with Nano-SiO2 Pickering Shell for Thermal Energy Storage and Release

ACS Nano
Michael GrahamDmitry G Shchukin

Abstract

Phase change materials (PCMs) store latent heat energy as they melt and release it upon freezing. However, they suffer from chemical instability and poor thermal conductivity, which can be improved by encapsulation. Here, we encapsulated a salt hydrate PCM (Mg(NO3)2·6H2O) within all-silica nanocapsules using a Pickering emulsion template. Electron microscopy analysis demonstrated robust silica-silica (RSS) shell formed inner silica layer of approximately 45 nm thickness, with silica Pickering emulsifiers anchored to the surface. The RSS nanostructured capsules are 300-1000 nm in size and have far superior thermal and chemical stability compared with that of the bulk salt hydrate. Differential scanning calorimetry showed encapsulated PCMs were stable over 500+ melt/freeze cycles (equivalent to 500+ day/night temperature difference) with a latent heat of 112.8 J·g-1. Thermogravimetric analysis displayed their impressive thermal stability, with as little as 37.2% mass loss at 800 °C. Raman spectroscopy proved the presence of salt hydrate within RSS capsules and illustrated the improved chemical stability compared to non-encapsulated Mg(NO3)2·6H2O. Energy capsule behavior compared with the bulk material was also observed at the mac...Continue Reading

References

Apr 12, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Zhihai CaoKatharina Landfester
May 30, 2013·Chemical Society Reviews·Anika SchradeUlrich Ziener
Sep 28, 2013·Science·Dmitry Shchukin, Helmuth Möhwald
Mar 17, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Alexander SchothRafael Muñoz-Espí
Jun 30, 2015·Chemistry : a European Journal·Paula Felix De Castro, Dmitry G Shchukin
Sep 9, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Susanne SihlerUlrich Ziener
Oct 30, 2015·Chemical Reviews·Lee A WeinsteinGang Chen
May 12, 2016·Advanced Materials·Ann-Christin BijlardAndreas Taden
Feb 24, 2017·Chemical Society Reviews·Tobias BollhorstMichael Maas
Apr 17, 2018·Chemical Society Reviews·E M ShchukinaD G Shchukin
Apr 16, 2019·Lab on a Chip·Albert ChuBrian Giera

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Citations

Jan 7, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Michael Graham, Dmitry Shchukin
Dec 23, 2020·ACS Applied Materials & Interfaces·Xiaojia LiuXing Ma

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