Method and solution for forming anatase titanium dioxide, and titanium dioxide particles, colloidal dispersion and film
US7534293B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 9, 2006 |
| Grant date | May 19, 2009 |
| Priority date | — |
| Expiry date | Mar 14, 2027 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2531/46
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A sol solution containing poly(titanic acid) and a planar heterocyclic ligand is provided. Titanium dioxide (TiO2) particles are formed by aging the sol solution at a temperature below about 140° 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 TiO2 particles. A photo-catalytic and transparent film may be formed from the TiO2 particles by depositing a layer of the colloidal dispersion on a support.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.