Electrospraying disperses a liquid into fine droplets by charging it at a nozzle and letting the electrostatic repulsion overcome the surface tension. The cone-jet mode gives the narrowest droplet distribution, and it exists only within a window of flow rate and applied voltage [1]. The droplet size scales with the flow rate and with the conductivity of the liquid, so a change in formulation shifts the operating window [2]. Because the droplets dry quickly, a dissolved polymer forms a particle and a dispersion forms a capsule with a core [3]. The process runs at ambient temperature, which is what makes it suitable for a heat-sensitive active [4]. The throughput per nozzle is low, and scaling up requires an array of nozzles rather than a larger one [5].
- electrohydrodynamic atomization
- cone-jet mode
- droplet size
- encapsulation
- ambient processing
- throughput
- charged droplet
Microencapsulation and Drying Processes·Food Science·Agricultural and Biological Sciences·Life Sciences
References
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- Oikonomopoulou, V.; Stramarkou, M.; Plakida, A.; Krokida, M. Optimization of encapsulation of stevia glycosides through electrospraying and spray drying. Food Hydrocolloids 2022, 131, 107854. [CrossRef]