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Microencapsulation of n-octadecane and methyl palmitate phase change materials in silica by spray drying process
- Source :
- Powder Technology. 361:910-916
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- The encapsulation of phase change materials (PCM) is the essential step to make PCM easily utilizable. Aiming for a feasible process on a large scale, the combination of PCM/sol-gel emulsion and the spray-dry process was employed for the production of PCM encapsulated in silica shell matrices. Two PCMs, methyl palmitate and n-octadecane, with operating temperature appropriated for thermal comfort in trocical countries were selected. The composition of emulsion, i.e. tetraethyl orthosilicate (TEOS), cetyl trimethyl ammonium bromide (CTAB), and n-octadecane or methyl palmitate, was varied to find the optimal conditions for encapsulation. The influence of composition and process time on PCM's emulsion stability, size and structure of microcapsules, and encapsulation efficiency were investigated. The results showed that the optimal PCM to silica ratio was determined by the maximum quantity that could maintain the rigidity of the microcapsule structure. The low surfactant concentration that could still sustain emulsion stability contributed to improved encapsulation efficiency.
- Subjects :
- Ammonium bromide
Materials science
General Chemical Engineering
02 engineering and technology
021001 nanoscience & nanotechnology
Tetraethyl orthosilicate
chemistry.chemical_compound
Phase change
020401 chemical engineering
Chemical engineering
chemistry
Octadecane
Pulmonary surfactant
Methyl palmitate
Spray drying
Emulsion
0204 chemical engineering
0210 nano-technology
Subjects
Details
- ISSN :
- 00325910
- Volume :
- 361
- Database :
- OpenAIRE
- Journal :
- Powder Technology
- Accession number :
- edsair.doi...........66c896cad4067326f89f75a2395eb4bd