Quantitative studies on the preparation of colloidal particles of cobalt hydroxide by the moving chemical reaction boundary method in agarose gel

Quantitative investigations were performed for the synthesis of colloidal particles of cobalt hydroxide in agarose gel by the moving chemical reaction boundary method . The experimental results show that: (1) the sizes of the colloidal particles can be controlled by changing the concentration of agarose gel, (2) the concentration of the colloidal particles is also controlled by changing the concentrations of CoCl₂ and/or NaOH, and (3) most importantly, the concentration of colloidal particles can be predicted with the theory of moving chemical reaction boundary (MCRB). The colloidal particles prepared by the MCRB are amorphous and are more easily oxidized than particles prepared by other methods.