High quality, microdeuterated polystyrene shells were fabricated using a density-matched emulsion method. The diameter and wall thickness of the shell ranged from 100 to 1500 and 3 to 15 μm, respectively. The sphericity, the wall thickness uniformity, and the surface smoothness were 99.8%, 99.3% and <0.1 μm, respectively. A defect on the inner surface of the shell was smeared by replacing water in the shell with ethanol prior to the final drying process.
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Takagi et al. (1991) studied this question.