Nickel(II) silicates and oxides – highly dispersed green pigments

Abstract

Purpose

The study reported here concerned production of green pigments, hydrated nickel(II) silicates and oxides, obtained by precipitation from solutions of sodium metasilicate and sodium hydroxide using nickel(II) sulphate.

Design/methodology/approach

The pigments were analysed using a number of techniques including scanning electron microscopy for particle surface morphology and dynamic light scattering for particle structure and the tendency of the particles to agglomerate.

Findings

The most desirable physicochemical parameters were shown by highly dispersed nickel(II) silicates precipitated in presence of the modifying agents. Silicate pigments precipitated in the presence of Rokanol K‐7 had low bulk densities, a high capacity to absorb water, dibutyl phthalate and paraffin oil within the primary particles, which is particularly noteworthy.

Practical implications

Due to their good dispersibility, well developed surface and appropriate coating power, coloured silicates of, e.g. chromium(III) and nickel(II) may be used as pigments and fillers for surface coatings.

Originality/value

The method of obtaining nickel(II) pigments developed was novel and provided a solution for problem of post‐galvanic nickel solutions.

Citation

Klapiszewska, B., Krysztafkiewicz, A. and Jesionowski, T. (2005), "Nickel(II) silicates and oxides – highly dispersed green pigments", Pigment & Resin Technology, Vol. 34 No. 3, pp. 139-147. https://doi.org/10.1108/03699420510597983