Molecular growth pathways in titania sol-gel polymerization

Conference · Fri Dec 31 04:00:00 EST 1993

OSTI ID:141604

Chen, Y; Klemperer, W G ^[1]; Day, V W; Eberspacher, T A ^[2]

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1. Univ. of Illinois, Urbana, IL (United States)
2. Univ. of Nebraska, Lincoln, NE (United States)

Sol-gel processing of titania is most simply carried out by hydrolysis and condensation polymerization of alkoxides Ti(OR){sub 4}. The course of the polymerization reaction is determined on a molecular level by the structure and reactivity of the intermediate species [Ti{sub x}O{sub y}](OR){sub (4x{minus}2y)} formed as Ti(OR){sub 4} is converted to TiO{sub 2}. A number of these species have been isolated: [Ti{sub 3}O](OR){sub 10}, [Ti{sub 7}O{sub 4}](OR){sub 20}, [Ti{sub 10}O{sub 8}](OR){sub 24},[Ti{sub 16}O{sub 16}](OR){sub 32}, [Ti{sub 11}O{sub 13}](OR){sub 18}, {alpha}-[Ti{sub 12}O{sub 16}](OR){sub 16}, and {alpha}2-[Ti{sub 12}O{sub 16}](OR){sub 16}. The chemical properties of these species have been studied in detail in an effort to understand how sol-gel polymerization conditions affect the nature of the titania product ultimately obtained.

• OSTI ID: 141604
• Report Number(s): CONF-930304--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
CHEMICAL REACTIONS
POLYMERIZATION
REACTION INTERMEDIATES
SOL-GEL PROCESS
TITANIUM OXIDES