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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

MICROFLUIDIC FABRICATION OF HEPTADECANE MICROCAPSULES VIA A O\O\W THREE-PHASE EMULSION ROUTE

Get access (open in a dialog) DOI: 10.1615/IHTC16.mmp.022319
pages 5643-5651

Résumé

Microencapsulated phase change materials (MEPCMs) which contains a PCM core and a polymer shell has attracted more and more attentions for its advantages in the thermal energy storage applications. As the structure of the MEPCMs has a great impact on the properties of the capsules, controlling the core and shell thicknesses of MEPCMs is important for the study of thermophysical properties of MEPCMs. This study focuses on preparing PCM microcapsules with heptadecane core and a UV-photocured acrylic shell from O/O/W double droplets. A coaxial flow microfludic device was used to produce the monodisperse heptadecanein-monomer droplets with predetermined core/shell volume ratios. The heptadecane, monomer and an aqueous polyvinyl alcohol solution were injected into the device from different inlet of the microfluidic device. By controlling the inlet velocities of the three phases, the core and shell thicknesses of the droplets could be controlled independently. The size of the core was controlled in the range of 100-500 µm, meanwhile the shell thickness was tuned in the range of 10-100 µm. Subsequent, the double droplets were collected and formed capsules with controlled core and shell thicknesses by UV light exposure.