Jump to main content
Jump to site search

Issue 10, 2013
Previous Article Next Article

Synthesis of cobalt aluminate nanopigments by a non-aqueous sol–gel route

Author affiliations

Abstract

Here we report the chemical synthesis of cobalt aluminum oxide (CoAl2O4) nanoparticles by a non-aqueous sol–gel route. The one-pot procedure is carried out at mild temperatures (in the 150 to 300 °C range), and consists of the reaction between cobalt acetate and aluminium isopropoxide in benzyl alcohol. The resulting CoAl2O4 nanoparticles show an unusually low average size, between 2.5 and 6.2 nm, which can be controlled by the synthesis temperature. The colorimetric properties of the nanoparticles are also determined by the synthesis temperature and the characteristic blue color of CoAl2O4 pigments is achieved in samples prepared at T ≥ 200 °C. The nanoparticles are antiferromagnetically ordered below ∼27 K with an uncompensated configuration. The uncompensated moment shows the typical features of strongly interacting superparamagnetic nanoparticles and spin-glass systems.

Graphical abstract: Synthesis of cobalt aluminate nanopigments by a non-aqueous sol–gel route

Back to tab navigation

Supplementary files

Publication details

The article was received on 21 Dec 2012, accepted on 26 Feb 2013 and first published on 13 Mar 2013


Article type: Paper
DOI: 10.1039/C3NR34229H
Citation: Nanoscale, 2013,5, 4277-4283
  •   Request permissions

    Synthesis of cobalt aluminate nanopigments by a non-aqueous sol–gel route

    M. Karmaoui, N. J. O. Silva, V. S. Amaral, A. Ibarra, Á. Millán and F. Palacio, Nanoscale, 2013, 5, 4277
    DOI: 10.1039/C3NR34229H

Search articles by author

Spotlight

Advertisements