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SEM images of particles resulting from spray drying a suspension of polystyrene colloids in water (170nm).
From:
http://www.umr-cnrs8612.u-psud.fr/tsapis/perso/droplets.html
"When we spray-dry colloids suspended in pure water, we obtain a powder made of doughnut-shaped particles. This doughnut shape is characteristic of a buckled shell"
--Nicolas Tsapis, Laboratoire de Pharmacie Galenique, UMR VNRS 8612, Faculte de Pharmacie, Chatenay-Malabry, France (nicolas.tsapis@u-psud.fr )
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