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Influence of Particle Size, Concentration and Drying Conditions on Colloidal Droplet Drying Kinetics and Dry Microparticle Morphology
JUSTICE ARCHER, Jim Walker, Jonathan P. Reid, University of Bristol
Abstract Number: 351
Working Group: Aerosol Physics
Abstract
The drying of aerocolloidal suspensions in aerosol droplets provides particles that are fundamental building blocks in many industrial applications including sprays in pharmaceuticals, inhaled drug delivery, cosmetics, ceramics and many more. Most often, the evaporation of such systems leads to the aggregation of the suspended solid particles in the droplet into a solid structure at the end of the drying process.
In this work, we will present measurements of drying kinetics of colloidal droplets composed of polystyrene beads of varying sizes and concentrations to explore how these colloidal droplet composition affects evaporation rates and the particle formation processes under different drying conditions -temperature and relative humidity based on single droplet drying experiments. Additionally, we will show scanning electron microscopy (SEM) images of dried aggregates of polystyrene beads from droplet chain experiments that demonstrate how control over initial colloidal droplet composition can be used to influence the dry particle morphology for a range of Péclet numbers. Using single droplet drying experiment and the droplet chain technique, we aim to provide a comprehensive experimental study resulting in improved understanding of the influence of droplet composition, concentration, drying conditions and the interaction mechanisms involved in dry microparticle morphology development, that are particularly encountered in spray-drying processes.