Volume 23 Issue 5 - February 22, 2013 PDF
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Structure Features of Nanotubes Synthesized from NaOH Treatment on TiO2 with Different Post-Treatments
Chien-Cheng Tsai1,2, Hsisheng Teng1,2,*
1 Department of Chemical Engineering, National Cheng Kung University, Tainan City 701, Taiwan
2 Center of Micro/Nano Science and Technology, National Cheng Kung University, Tainan City 701, Taiwan
Chemistry of Materials 18 (2006) 367-373.
Times Cited: 260 (from Web of Science 2013/02/20)
 
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This research shows that titanate nanotubes synthesized from NaOH treatment on TiO2 powders with subsequent acid washing can readily proceed with structural variation through a simple pH value regulation. We identified the structure of the titanate formed after the NaOH treatment to be a divalent-salt titanate (Na2Ti2O5•H2O) with a layered feature and provided the unit cell parameters for this material. By increasing the acidity in the post-treatment acid washing, the titaniate layers scrolled and transformed into nanotube through a mechanism of Na+/H+ substitution and eventually transformed into anatase TiO2 with further acidity increase. Detailed analysis of crystal structures has demonstrated the possibility and feasibility of this titanate/titania transformation through a simple structure rearrangement. This study provides a complete scheme for the formation and transformation of nanotubes caused by the NaOH treatment and the post-treatment washing.

The following figure shows that titanate nanotubes synthesized from NaOH treatment on TiO2 could proceed with repeatable crystalline-structure transformation through a simple acid/base washing step.
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