title: TiO2-derived titanate nanotubes by hydrothermal process with acid treatments and their microstructural evaluation.
abstract: In this study, the effect of post acid treatments with HCl aqueous solutions after the hydrothermal process on the microstructure of TiO2-derived titanate nanotube was investigated. Especially, the relationship between local structural changes with the HCl treatment and their thermal stability were investigated by X-ray absorption fine structure (XAFS). Consequently, it revealed that the replacement of Na+ with H+ (proton exchange) in TiO2-derived titanate nanotubes was caused by the acid treatment with HCl aqueous solutions and the excess acid treatment led to the disordering. Moreover, it was confirmed that the minor change of TiOx polyhedra in TiO2-derived titanate nanotubes was also related with this disordering.
authors: Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuencho, Naka-ku, Sakai, Osaka 599-8531, Japan. nakahira@mtr.osakafu-u.ac.jp
authors: Atsushi
authors: A
authors: Nakahira
authors: Takashi
authors: T
authors: Kubo
authors: Chiya
authors: C
authors: Numako
mesh_terms: D000143:Acids / Q000737:chemistry*; D003460:Crystallization / Q000379:methods; D006358:Hot Temperature; D008422:Materials Testing; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D013314:Stress, Mechanical; D013499:Surface Properties; D013718:Tensile Strength; D014025:Titanium / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D000143:Acids; D014867:Water; C009495:titanium dioxide; D014025:Titanium