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Small capsules: Nanoscale silica capsules can be synthesized by the oxidation of nanoscale bubbles in the poly(dimethylsiloxane) domains of poly(styrene-b-dimethylsiloxane). These nanobubbles are introduced by a process involving supercritical carbon dioxide. The nanocapsules are opened up after dry etching (see AFM image).
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Li et al. (2006) studied this question.
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