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Using Cu 2 O nanowires as sacrificial templates, SnO 2 nanotubes have been synthesized via wet chemical process. The morphology and the fine crystalline structure of the produced SnO 2 nanotubes have been characterized. None of any oxidizing agents or acid was added into the reaction system, which makes the mechanism much different from the known ones based on acidic or oxidative/redox etching of metal oxide templates. Accordingly one discusses the growth mechanism and attributes it to the hydrolysis of Sn 4+ , to form SnO 2 , and the coordination of CuCl with Cl − , to form soluble [CuClx] 1−x , eliminating Cu 2 O nanowires. [ABSTRACT FROM AUTHOR]

KDP crystals were grown by the "point seed" rapid growth technique from aqueous solutions with different organic additives, including NTA, HEDTA, EDTA and DCTA. The growth rates were up to about 20 mm/day. The influences of these organic additives on the growth habit and optical properties of these as-grown KDP crystals have been studied. Such organic additives were all found to be able to enhance the solution stability and promote the growth rate for the (100) face of KDP crystals. Furthermore, the UV transmittance and laser damage threshold of the KDP crystals were both increased with the addition of these organic additives. It is proposed that the beneficial influences are due to the chelating action of such organic additives with metal ion impurities in the growth solutions. [ABSTRACT FROM AUTHOR]