Projects per year
Abstract
A droplet chain technique was used to study the influence of the
crystallization process on the morphology of spray dried microparticles.
A piezoceramic dispenser produced a chain of monodisperse solution
droplets with an initial diameter in the range of 60–80 µm. Aqueous
solutions of sodium nitrate were prepared in concentrations ranging from
5 mg/ml to 5⋅10−5 mg/ml. The solution droplets were injected
into a laminar flow with gas temperatures varying from 25 to 150°C,
affecting the droplet temperature and the evaporation rate, accordingly.
Dried particles with diameters between 0.3 and 18 µm were collected.
The properties of the collected microparticles were studied and
correlated with a particle formation model which predicted the onset of
saturation and crystallization. The model accounted for the dependence
of the diffusion coefficient of sodium nitrate in water on droplet
viscosity. The viscosity trend for sodium nitrate solutions was
determined by studying the relaxation time observed during coalescence
of two aqueous sodium nitrate droplets levitated in optical tweezers.
The combination of theoretical derivations and experimental results
showed that longer time available for crystallization correlates with
larger crystal size and higher degrees of crystallinity in the final
microparticles.
Original language | English |
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Pages (from-to) | 693-704 |
Number of pages | 12 |
Journal | Aerosol Science and Technology |
Volume | 50 |
Issue number | 7 |
Early online date | 15 Apr 2016 |
DOIs | |
Publication status | Published - 2 Jul 2016 |
Fingerprint
Dive into the research topics of 'Effect of crystallization kinetics on the properties of spray dried microparticles'. Together they form a unique fingerprint.Projects
- 2 Finished
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New Frontiers in Aerosol Measurements
Royall, C. P. (Co-Principal Investigator) & Reid, J. P. (Principal Investigator)
30/03/14 → 29/08/17
Project: Research
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NEW STRATEGIES FOR SAMPLING, ANALYSING AND UNDERSTANDING AEROSOLS
Reid, J. P. (Principal Investigator)
1/03/09 → 1/09/14
Project: Research