Stable concentrated metal colloids and methods of making same
US7514476B2 · kind B2 · utility
9Cited by
34References
26Claims
0Family size
Assignee
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Key dates
| Filing date | Mar 17, 2006 |
| Grant date | Apr 7, 2009 |
| Priority date | — |
| Expiry date | Feb 7, 2027 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J37/18
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Metal-containing colloids are manufactured by reacting a plurality of metal ions and a plurality of organic agent molecules to form metal complexes in a mixture having a pH greater than about 4.25. The metal complexes are reduced for at least 0.5 hour to form stable colloidal nanoparticles. The extended reduction time improves the stability of the colloidal particles as compared to shorter reduction times. The stability of the colloidal particles allows for colloids with higher concentrations of metal to be formed. The concentration of metal in the colloid is preferably at least about 150 ppm by weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.