Highly Stable Energy Capsules with Nano-SiO2 Pickering Shell for Thermal Energy Storage and Release
Autor: | Matthew Bilton, M. Graham, Elena Shchukina, Andrei A. Novikov, Jim T. Smith, Vladimir A. Vinokurov, Dmitry G. Shchukin |
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Rok vydání: | 2020 |
Předmět: |
Thermogravimetric analysis
Materials science business.industry General Engineering General Physics and Astronomy 02 engineering and technology Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology 7. Clean energy 01 natural sciences Pickering emulsion 0104 chemical sciences Thermal conductivity Differential scanning calorimetry Chemical engineering 13. Climate action General Materials Science Thermal stability Chemical stability 0210 nano-technology business Thermal energy |
Zdroj: | ACS Nano. 14:8894-8901 |
ISSN: | 1936-086X 1936-0851 |
Popis: | 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 macroscale with thermal imaging, showing that the melting/freezing behavior of the PCM is confined to the nanocapsule core. The thermal conductivity of the silica shell measured by laser flash thermal conductivity method is 1.4 ± 0.2 W·(m·K)-1, which is around 7 times more than the thermal conductivity of the polymer shell (0.2 W·(m·K)-1). RSS capsules containing PCMs have improved thermal stability and conductivity compared to polymer-based capsules and have good potential for thermoregulation or energy storage applications. |
Databáze: | OpenAIRE |
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