Method for preparing water-soluble nanoparticles and their dispersions
US9028724B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 14, 2010 |
| Grant date | May 12, 2015 |
| Priority date | — |
| Expiry date | Oct 16, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2004/04
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Provided is a method for preparing an aqueous dispersion of metal nanoparticles having superior dispersibility and being sinterable at low temperature by modifying the surface of metal nanoparticles having hydrophobic groups with hydrophilic groups. Specifically, by treating the surface hydrophobic groups of the metal nanoparticles with a surface modification solution containing a surfactant and a wetting-dispersing agent, the treatment throughput can be improved about 10-fold and the particles can be monodispersed without agglomeration. Further, by using an antioxidant and a ligand removal agent in the solution, denaturation and oxidation of the particles can be prevented and the high-boiling-point hydrophobic ligands can be eliminated effectively. The hydrophilically treated metal nanoparticles may be dispersed in an aqueous-based solvent to prepare a metal ink sinterable at low temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.