Microencapsulation of caprylic acid with different wall materials as phase change material for thermal energy storage

Konuklu Y., Unal M., PAKSOY H. Ö.

SOLAR ENERGY MATERIALS AND SOLAR CELLS, cilt.120, ss.536-542, 2014 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 120
  • Basım Tarihi: 2014
  • Doi Numarası: 10.1016/j.solmat.2013.09.035
  • Dergi Adı: SOLAR ENERGY MATERIALS AND SOLAR CELLS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.536-542
  • Anahtar Kelimeler: Microcapsule, Caprylic acid, Phase change material (PCM), Coacervation, Thermal energy storage, N-OCTADECANE, FATTY-ACIDS, MICROCAPSULES, PERFORMANCES, SHELLS, CORE
  • Çukurova Üniversitesi Adresli: Evet

Özet

In this study, caprylic acid (octanoic acid) suitable for thermal energy storage applications was microencapsulated with different wall materials, including urea-formaldehyde resin, melamine-formaldehyde resin, urea+melamine-formaldehyde resin. Microcapsules were prepared using coacervation method. Hardening process of microencapsulated phase change material (PCM) was done with formaldehyde. The morphology and particle sizes of microencapsulated PCM were analyzed by scanning electron microscopy, (SEM). The latent heat storage capacities of caprylic acid and microencapsulated caprylic acid were determined with differential scanning calorimetry (DSC). The chemical characterization of microcapsules was determined by Fourier transformed infrared (FTIR) spectroscopy. It is concluded that urea-formaldehyde resin was the best capsule wall material for caprylic acid. Based on all results, it can be considered that the microcapsules were synthesized successfully and that, the phase change enthalpies of melting and freezing were about 93.9 J/g and 106.1 J/g, respectively, the particle diameter was 200 nm-1.5 mu m. (C) 2013 Elsevier B.V. All rights reserved.