Resumo

BLANCO, O. et al. Colloidal synthesis of C0A1₂O₄ nanoparticles using dodecylamine and their structural characterization. Superf. vacío [online]. 2016, vol.29, n.3, pp.78-82.  Epub 30-Out-2020. ISSN 1665-3521.

A mechanism of formation of colloidal particles was proposed by LaMer and Dinegar in order try to explain the variation of the concentration of the reagents with the time in the colloidal solution. According to the LaMer mechanism, if the concentration of the reagents is increased gradually then this could reach the super-saturation limit and consequently, a nucleation and growth process occurs. From this point of view, in this work the formation of CoAl2O4 nanoparticles in the under-supersaturation limit can be partially explained by this mechanism. A non-aqueous colloidal method was formulated using the organic compound dodecylamine as a surfactant agent. By a variation of dodecylamine concentration two distinct morphologies for the CoAl2O4 spinel phase were obtained. The thermal decomposition of the precursor mixture resulted in the formation of the blue CoAl2O4 spinel phase at a temperature of 800 °C.

Palavras-chave : Dodecylamine; colloidal; spinel; nanoparticles.