title: Rapid synthesis of low-fractal dimension titanium oxide polymers by a sol-gel technique using hydrazine monohydrochloride.
abstract: Titanium oxide polymers having a low-fractal dimension (d(f) < 2) were rapidly synthesized from titanium tetra-n-butoxide via a catalytic sol-gel process with a hydrazine monohydrochloride catalyst. Different from conventional sol-gel processes aimed at producing low-fractal dimension titanium oxide polymers, the present synthetic strategy needed neither organic ligand to enhance the stability of titanium alkoxides nor an extremely long reaction time in a strongly acidic solution condition, thanks to a drastically accelerated polycondensation reaction. We pursued the structure evolution of the titanium oxide polymers by means of time-resolved small-angle X-ray scattering (Tr-SAXS). The SAXS data unambiguously demonstrate the generation of the expanded polymer-like structure characterized by the fractal dimension of d(f) approximately equal 5/3. The results offer an efficient route to the synthesis of the weakly-branched titanium oxide polymers, which are expected to be used to create a wide range of optical materials having a high refractive index, such as anti-glare coating.
authors.affiliation: Division of Chemistry and Materials, Faculty of Textile Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda 386-8567, Japan.
authors.forename: Wataru
authors.initials: W
authors.lastname: Shimizu
authors.forename: Takaaki
authors.initials: T
authors.lastname: Sato
authors.forename: Taki
authors.initials: T
authors.lastname: Matsumoto
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Murakami