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Titanate nanotubes were synthesized by hydrothermal treatment in concentrated NaOH solution followed by HC1 washing.The as-prepared nanotubes were characterized by X-ray diffiaction (XRD),transmission electron microscopy (TEM),and N2 adsorption-desorption isotherm measurements (BET).The results displayed that the hydrothermal treatment temperature within 110-160℃ not only affected the structure of the nanotube,but also the anatase-to-rutile transformation temperature.The nanotube could be obtained only in an appropriate eoncentraion of NaOH solution.The diameter of the nanotube was 6-10nm The surface area of the product initially increased with increasing treatment temperature,to reach a maximum of about 630 m2/g at 130℃,and then decreased with a further increase in temperature.