Inscrição na biblioteca: Guest

ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

EFFECTS OF FABRICATION CONDITIONS ON SILICA HARD-SHELL MICROCAPSULES CONTAINING PHASE CHANGE MATERIALS

Get access (open in a dialog) DOI: 10.1615/IHTC16.ecs.022594
pages 4319-4325

Resumo

In order to increase the void fraction in silica hard-shell microcapsules containing phase change materials, the effects of the reaction time for generating the silica shell have been investigated. The reaction time in the W/O/W double emulsion method for silica hard-shell microcapsule fabrication was changed from 10 to 120 min. The size and the shell thickness of hollow microcapsules were measured by a laser diffraction particle size analyzer and by an image processing method on SEM images, respectively. The void fraction was also confirmed by differential scanning calorimeter (DSC) measurements. As phase change materials, disodium hydrogen phosphate-12 water hydrate whose phase change temperature is 32°C and latent heat is 264kJ/kg was applied in this study. From this, it was found that the shell thickness increase with the reaction time, while the microcapsule size was constant after 30 min. The maximum void fraction was obtained when the reaction time was set at 10 min. It was 73.8vol%, which is larger than the results reported in the previous study. It was also confirmed by the latent heat measurements. Thus, it was concluded that the void fraction could be improved by the tuning of the reaction time.