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

Bence Németh, Ágnes S. Németh, Judit Tóth, Andrea Fodor-Kardos, János Gyenis, Tivadar Feczkó

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Abstract 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.

Original languageEnglish
Article number7855
Pages (from-to)397-405
Number of pages9
JournalSolar Energy Materials and Solar Cells
Volume143
DOIs
Publication statusPublished - Aug 11 2015

Keywords

  • Alginate-paraffin microcapsules
  • Latent heat storage
  • Phase change material

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films

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