Fabrication of hard-shell microcapsules containing inorganic materials

•Hard-shell microcapsules containing Na2HPO4∙12H2O were fabricated.•Microcapsules depressed the supercooling of the inorganic hydrates.•Effects of the parameters in the process of fabrication on the microcapsule size were investigated.•The surfactants reduction in the process realized high void frac...

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Bibliographic Details
Published in:International journal of refrigeration 2017-10, Vol.82, p.97-105
Main Authors: Tamaru, Masato, Suzuki, Hiroshi, Hidema, Ruri, Komoda, Yoshiyuki, Suzuki, Kosuke
Format: Article
Language:English
Subjects:
Chaleur latente
Cooling
Flammability
Heat transfer
Hydrate inorganique
Hydrogen storage
Inorganic chemistry
Inorganic hydrate
Inorganic materials
Latent heat
Matériau à changement de phase
Microcapsule
Microencapsulation
Phase change material
Silica
Silicon dioxide
Sodium hydrogen phosphate
Supercooling
Surfactants
Thermal storage
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Summary:•Hard-shell microcapsules containing Na2HPO4∙12H2O were fabricated.•Microcapsules depressed the supercooling of the inorganic hydrates.•Effects of the parameters in the process of fabrication on the microcapsule size were investigated.•The surfactants reduction in the process realized high void fraction of hollow microcapsules. The fabrication method of silica hard shell microcapsules containing disodium hydrogen phosphate dodecahydrate (Na2HPO4⋅12H2O) has been developed. The effects of the mixing rates for the emulsification, of the volume ratios of solutions and of surfactant concentrations on the size of hollow microcapsules have been also studied. From the results, it was confirmed that silica hard shell microcapsules can contains Na2HPO4⋅12H2O with the present method using hollow microcapsules. The present micro-encapsulated Na2HPO4⋅12H2O was also found to cause the supercooling depression effect. As the fabricated microcapsules have no flammability, the present microcapsule was concluded to be a promising item not only for latent heat transportation media but also for the static thermal storage materials for architectural structures. From the studies on the fabrication parameters, it was concluded that the control of the surfactant concentration is effective for controlling the size of microcapsule.
ISSN:0140-7007
1879-2081
DOI:10.1016/j.ijrefrig.2017.06.036