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Research and innovation | REF: IN121 V1

Microcapsules having a thermal release. A new approach to the fabrication of core shell capsules

Authors: Véronique SCHMITT, Mathieu DESTRIBATS, Rénal BACKOV

Publication date: March 10, 2011

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2. Principle

The principle (see figure 1 ) is based on the hot production of an emulsion formed by oil droplets in an aqueous phase, followed by the synthesis of a rigid, brittle shell coating the droplets. This emulsion has two characteristics:

  • water-oil interface stabilizers are solid particles (Pickering emulsions);

  • oil characterized by its melting temperature T f is solid at storage temperature and becomes liquid at use temperature. The melting of the oil is accompanied by a volumetric expansion that is sufficient to break the solid shell. Indeed, because of its rigid nature, the silica shell (silicon dioxide noted SiO 2 ) is too little deformable to...

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