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Crystallization in Emulsions: A Thermo-Optical Method to Determine Single Crystallization Events in Droplet Clusters

Abramov, Serghei; Ruppik, Patrick; Schuchmann, Heike P.

Abstract:
Delivery systems with a solid dispersed phase can be produced in a melt emulsification process. For this, dispersed particles are melted, disrupted, and crystallized in a liquid continuous phase (melt emulsification). Different to bulk crystallization, droplets in oil-in-water emulsions show individual crystallization behavior, which differs from droplet to droplet. Therefore, emulsion droplets may form liquid, amorphous, and crystalline structures during the crystallization process. The resulting particle size, shape, and physical state influence the application properties of these colloidal systems and have to be known in formulation research. To characterize crystallization behavior of single droplets in micro emulsions (range 1 µm to several hundred µm), a direct thermo-optical method was developed. It allows simultaneous determination of size, size distribution, and morphology of single droplets within droplet clusters. As it is also possible to differentiate between liquid, amorphous, and crystalline structures, we introduce a crystallization index, CIi, in dispersions with a crystalline dispersed phase. Application of the thermo-optical approach on hexadecane-in-water model emulsion showed the ability of the method to detect single crystallization events of droplets within emulsion clusters, providing detailed information about crystallization processes in dispersions.

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Verlagsausgabe §
DOI: 10.5445/IR/1000132130
Veröffentlicht am 29.04.2021
Originalveröffentlichung
DOI: 10.3390/pr4030025
Scopus
Zitationen: 13
Web of Science
Zitationen: 13
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Bio- und Lebensmitteltechnik (BLT)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 11.08.2016
Sprache Englisch
Identifikator ISSN: 2227-9717
KITopen-ID: 1000132130
Erschienen in Processes
Verlag MDPI
Band 4
Heft 3
Seiten Art. Nr.: 25
Schlagwörter melt emulsification; emulsion crystallization; thermo-optical colloid analysis; crystallization index
Nachgewiesen in Scopus
Web of Science
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