| Full text | |
| Author(s): |
Total Authors: 2
|
| Affiliation: | [1] Univ Sao Paulo, Inst Quim Sao Carlos, Colloidal Mat Grp, CP 780, BR-13566590 Sao Carlos, SP - Brazil
Total Affiliations: 1
|
| Document type: | Journal article |
| Source: | Nanotechnology; v. 29, n. 6 FEB 9 2018. |
| Web of Science Citations: | 4 |
| Abstract | |
A synthetic procedure is described for the obtaining of superparamagnetic Co nanoparticles (NPs) via hot-injection method in the presence of sodium borohydride. The Co NPs obtained have an average diameter of 5.3 nm and saturation magnetization of 115 emu g(-1). A modified Langevin equation is fitted to the magnetization curves using a log-normal distribution for the particle diameter and an effective field to account for dipolar interactions. The calculated magnetic diameter of the Co NPs is 0.6 nm smaller than TEM-derived values, implying a magnetic dead layer of 0.3 nm. The magnetic core is coated with Au to prevent oxidation, resulting in water-stable magneto-plasmonic Co/Au core/shell NPs with saturation of 71.6 emu g(-1). The coating adds a localized surface plasmon resonance property with absorbance in the so-called `therapeutic window' (690-900 nm), suitable for biomedical applications. It is suggested that these multifunctional NPs are distinguished as a potential platform for applied and fundamental research. (AU) | |
| FAPESP's process: | 10/04208-7 - Magnetic nanoparticles of gold-coated cobalt and cobalt ferrite as biocompatible materials for biomedical applications |
| Grantee: | João Batista Souza Junior |
| Support Opportunities: | Scholarships in Brazil - Master |
| FAPESP's process: | 12/02093-3 - Synthesis of Co@Au (superparamagnetics) and CdSe@Zn (quantum dots) core@shell nanostructures for applications as antineoplasia agents |
| Grantee: | João Batista Souza Junior |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 13/01284-2 - Theranostic nanoparticles based in superparamagnetic iron oxide for skin cancer therapy by magnetic hyperthermia |
| Grantee: | Laudemir Carlos Varanda |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 07/07919-9 - Colloidal magnetic nanocrystals: synthesis of self-assembled and macromolecules-functionalised nanospheres, nanowires, and nanorods for advanced magnetic recording, biotechnological, and biomedical applications |
| Grantee: | Laudemir Carlos Varanda |
| Support Opportunities: | Research Grants - Young Investigators Grants |