Method for silica encapsulation of magnetic particles
US8557329B2 · kind B2 · utility
8Cited by
7References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 6, 2010 |
| Grant date | Oct 15, 2013 |
| Priority date | — |
| Expiry date | Dec 24, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/344
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Provided is a method of inhibiting magnetically induced aggregation of ferrimagnetic and/or ferromagnetic nanoparticles by encapsulating the nanoparticles in a silica shell. The method entails coating magnetic nanoparticle surfaces with a polyacid polymer to form polymer-coated magnetic nanoparticles and treating the polymer-coated magnetic nanoparticles with a silica precursor to form uniform silica-coated magnetic nanoparticles. By controlling the thickness of the silica encapsulating the nanoparticles, the inherent magnetically induced aggregation of the nanoparticles can be completely inhibited.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.