Synthesis and characterization of large colloidal cobalt particles

Verónica Salgueiriño-Maceira; Miguel A. Correa-Duarte; Michael Farle; M. Arturo López-Quintela; Karl Sieradzki; Rodolfo Diaz

doi:10.1021/la0526885

Synthesis and characterization of large colloidal cobalt particles

Verónica Salgueiriño-Maceira, Miguel A. Correa-Duarte, Michael Farle, M. Arturo López-Quintela, Karl Sieradzki, Rodolfo Diaz

Research output: Contribution to journal › Article › peer-review

54 Scopus citations

Abstract

Large colloidal environmentally stable silica-coated cobalt particles were synthesized by combining the sodium borohydride reduction in aqueous solution and the Stöber method. Low size polydisperse cobalt spheres with an average size of 95 nm were synthesized by using a borohydride reduction method and were subsequently coated with a thin layer of silica by means of hydrolysis and condensation of tetraethylorothosilicate (TEOS) in an aqueous/ ethanolic solution. The large uniform cobalt spheres consist of smaller metallic Co clusters, explaining the superparamagnetic behavior of the spheres. The particles were investigated by transmission electron microscopy (TEM) and vibrating sample magnetometry (VSM).

Original language	English (US)
Pages (from-to)	1455-1458
Number of pages	4
Journal	Langmuir
Volume	22
Issue number	4
DOIs	https://doi.org/10.1021/la0526885
State	Published - Feb 14 2006

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Surfaces and Interfaces
Spectroscopy
Electrochemistry

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AU - Salgueiriño-Maceira, Verónica

AU - Correa-Duarte, Miguel A.

AU - Farle, Michael

AU - López-Quintela, M. Arturo

AU - Sieradzki, Karl

AU - Diaz, Rodolfo

PY - 2006/2/14

Y1 - 2006/2/14

N2 - Large colloidal environmentally stable silica-coated cobalt particles were synthesized by combining the sodium borohydride reduction in aqueous solution and the Stöber method. Low size polydisperse cobalt spheres with an average size of 95 nm were synthesized by using a borohydride reduction method and were subsequently coated with a thin layer of silica by means of hydrolysis and condensation of tetraethylorothosilicate (TEOS) in an aqueous/ ethanolic solution. The large uniform cobalt spheres consist of smaller metallic Co clusters, explaining the superparamagnetic behavior of the spheres. The particles were investigated by transmission electron microscopy (TEM) and vibrating sample magnetometry (VSM).

AB - Large colloidal environmentally stable silica-coated cobalt particles were synthesized by combining the sodium borohydride reduction in aqueous solution and the Stöber method. Low size polydisperse cobalt spheres with an average size of 95 nm were synthesized by using a borohydride reduction method and were subsequently coated with a thin layer of silica by means of hydrolysis and condensation of tetraethylorothosilicate (TEOS) in an aqueous/ ethanolic solution. The large uniform cobalt spheres consist of smaller metallic Co clusters, explaining the superparamagnetic behavior of the spheres. The particles were investigated by transmission electron microscopy (TEM) and vibrating sample magnetometry (VSM).

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Synthesis and characterization of large colloidal cobalt particles

Abstract

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