Agency for Science, Technology and Research

Zhaolin Liu

Liang Hong

Wei Ling Wang

Bing Guo

Zetao Xia

Teng Sheng Peh

Xinhui Zhang

Huixin Jiang

The present invention relates to a perovskite-type strontium titanate, wherein the strontium titanate is Y- and Ni-doped and has the general formula (Sr,Y)(Ti,Ni)O. A method of preparing the perovskite-type strontium titanate and its use are also provided.

Perovskite-type strontium titanate

A proton-exchange composite includes a polymer matrix formed from a proton-exchange polymer and ionomer particles distributed therein. The polymer has side chains with ionic groups. The particles have an average particle size of less than 20 nm and include an oligomeric ionomer that interacts with the polymer and attracts the ionic groups on its side chains. The composite may be formed by a method in which an initiator is bonded to silica particulates. The initiator is used to initiate polymerization of a precursor monomer to form a salt form of the oligomeric ionomer bonded to the silica particulates, which is then reacted with an acid to produce the oligomeric ionomer, thus forming the ionomer particles. The ionomer particles are dispersed in a solution containing a solvent and the polymer dissolved therein. The solvent is removed. The residue is cured to form the composite.

Proton-exchange composite containing nanoparticles having outer oligomeric ionomer, and methods of forming

A sol solution containing poly(titanic acid) and a planar heterocyclic ligand is provided. Titanium dioxide (TiO) particles are formed by aging the sol solution at a temperature below about 140&#xb0; C. The particles have multi-coordinated Ti-complexes comprising the heterocyclic ligand and can be substantially in the anatase phase. The heterocyclic ligands can be triazole, tetrazole, or thiadiazole. The sol solution may be prepared by aging a precursor solution. The precursor solution may contain the heterocyclic ligands and a precursor for poly(titanic acid). The precursor may be titanium alkoxide or titanium chloride. The sol solution may also contain at least one of an organic acid, a base, and a surfactant. The aged sol solution may form a colloidal dispersion of the TiOparticles. A photo-catalytic and transparent film may be formed from the TiOparticles by depositing a layer of the colloidal dispersion on a support.

Method and solution for forming anatase titanium dioxide, and titanium dioxide particles, colloidal dispersion and film

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Zhaolin Liu