Macrotubes with nanostructures are formed at rates of cm s−1 when aqueous zinc sulfate is injected into a silicate solution and a gas bubble is pinned to the reaction zone. Straight, long (>10 cm), and hollow structures with diameters of 500 μm can be grown, which upon heating are luminescent, and can photodegrade rhodamine B (RhB). The presence of ZnO on the interior surface is confirmed by electron and X-ray diffraction.
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Pagano et al. (2008) studied this question.
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