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Ellipsoidal mesoscale “egg shells” (see Figure) have been prepared by a template-directed synthesis using a sol-gel precursor. TiO2 shells of micrometer sizes should have a great potential as containers in microencapsulation and their ellipsoidal shape should provide them with a range of interesting optical, mechanical, and hydrodynamic properties.
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Lu et al. (2001) studied this question.
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