title: Redispersible rutile TiO2 nanocrystals in organic media by surface chemical modification with an inorganic barium hydroxide.
abstract: The present paper describes the synthesis of the redispersible rutile TiO2 nanocrystals in organic media by surface chemical modification reaction in an aqueous barium hydroxide solution. In our facile surface modification reactions, the surfaces of the TiO2 nanocrystals are coated by bimetallic TiOBa spices and saturated with BaOH terminal groups. The inherent characteristics such as morphology, size, crystallinity, and color of the nanocrystals remained almost unchanged after surface-treatment, but their dispersibility in organic media such as methanol and DMF were remarkably enhanced. It is ascribed that BaOH groups in the surface of the TiO2 nanocrystals prevented the formation of covalently bound agglomerates through Ti-O-Ti condensation reaction among the nanocrystals during the purification and water-elimination procedures.
authors.affiliation: Advanced Materials Division, Korea Research Institute of Chemical Technology, 100 Jang-Dong, Yuseong-Gu, Daejon 305-600, South Korea.
authors.forename: Bok Yeop
authors.initials: BY
authors.lastname: Ahn
authors.forename: Sang Il
authors.initials: SI
authors.lastname: Seok
authors.forename: Nimai Chand
authors.initials: NC
authors.lastname: Pramanik
authors.forename: Hoon
authors.initials: H
authors.lastname: Kim
authors.forename: Suk-In
authors.initials: SI
authors.lastname: Hong