Consolidated microcapsules with double alginate shell containing paraffin for latent heat storage

Németh, Bence and Németh Sz., Ágnes and Tóth, Judit and Fodor-Kardos, Andrea and Gyenis, János and Feczkó, Tivadar (2015) Consolidated microcapsules with double alginate shell containing paraffin for latent heat storage. Solar Energy Materials and Solar Cells. ISSN 0927-0248


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Double-shell alginate microcapsules containing paraffin phase change material (PCM) were prepared for latent heat storage by a method of repeated interfacial coacervation/crosslinking. The proposed process consisted of three main steps: (1) preparation of paraffin containing core particles by dripping an O/W emulsion of melted paraffin and aqueous sodium alginate into a calcium chloride ionic cross-linking solution, (2) encapsulation of the core particles into double alginate shell by ionic gelation/crosslinking by repeated interactions between the sodium alginate and calcium chloride solutions, and (3) consolidation of the capsule shells by contact heat treatment. The effects of process parameters such as the sodium alginate concentration, the calcium chloride concentration in certain stages of the process, and the contact time between the formed core particles and the surrounding alginate solution on the paraffin content and the mean diameter of capsules were studied by experimental design and statistical evaluations. The prepared PCM capsules had uniform sizes, core/shell structure, double-walled non-porous alginate coating, tunable void space inside the core, and suitably high paraffin content at properly selected process conditions, corresponding to 95.0 J/g melting and 91.7 J/g freezing latent heat capacity. Thermogravimetric analysis and repeated thermal cycling evidenced good thermal stability, and proper mechanical strength for leakage free microcapsules.

Item Type: Article
Subjects: Q Science / természettudomány > QD Chemistry / kémia
Depositing User: Dr. Tivadar Feczkó
Date Deposited: 10 Sep 2015 06:46
Last Modified: 31 Dec 2017 00:15

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