Abstract
Silica colloids embedded with superparamagnetic iron oxide nanoparticles were synthesized by combining commercial ferrofluids with the well-known Stöber process. In a typical procedure, organophilic iron oxide nanoparticles were extracted from a ferrofluid and redispersed in toluene. The suspension was then added to an alcoholic medium to produce emulsion drops consisting of aggregates of iron oxide nanoparticles and toluene. When tetraethylorthosilicate was introduced into the system, it hydrolyzed and formed silica coating around each emulsion drop. The final size of silica colloids depended on the concentration of iron oxide nanoparticles and the type of solvent used for the Stöber synthesis. Larger colloids were obtained at lower concentrations of iron oxide nanoparticles and in alcohols with higher molecular weights.
| Original language | English |
|---|---|
| Pages (from-to) | 19-23 |
| Number of pages | 5 |
| Journal | Chemical Physics Letters |
| Volume | 401 |
| Issue number | 1-3 |
| DOIs | |
| Publication status | Published - 2005 Jan 1 |
| Externally published | Yes |
Bibliographical note
Funding Information:This work has been supported in part by a DARPA-DURINT subcontract from Harvard University and a Fellowship from the David and Lucile Packard Foundation. Y.X. is a Camille Dreyfus Teacher Scholar and an Alfred P. Sloan Research Fellow. S.H.I. and Y.T.L. have also been supported in part by the Post-doctoral Fellowship Program of the Korean Science and Engineering Foundation (KOSEF). T.H. thanks the Center for Nanotechnology at the UW for an IGERT fellowship that is funded by the National Science Foundation (DGE-9987620).
Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
ASJC Scopus subject areas
- General Physics and Astronomy
- Physical and Theoretical Chemistry