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Nanotubes TiO 2 were synthesized from layered titanate Na 2 Ti 3 O 7 particles by a soft chemical process. These nanotubes have a hollow structure with an opening end. The wall of nanotubes is very well crystallized multi-wall structure. The inner diameters of nanotubes are ca. 30–40nm and the length up to several hundreds nanometers. XRD results show that TiO 2...
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