Synthesis and characterization of dense core-shell particles prepared by non-solvent displacement nonaqueous precipitation method taking C@ZrSiO4 black pigment preparation as the case

Abstract

A novel non-solvent displacement nonaqueous precipitation method was developed for core-shell materials preparation taking C@ZrSiO₄ black pigments synthesis as the case. The effects of the precursor concentration on the synthesis and coloration of the C@ZrSiO₄ pigment was investigated via X-ray diffraction, transmission electron microscopy, field-emission scanning electron microscopy, Fourier-transform infrared spectroscopy, Raman spectroscopy, and CIELAB colorimetry. The results show that the optimized precursors concentration is 1.50 mol/L, C@ZrSiO₄ encapsulated pigments prepared by the method have a uniform and dense shell encapsulated zircon layer with the thickness of 10–20 nm. The size of C@ZrSiO₄ encapsulated pigments was 50–210 nm, without particles agglomeration. This uniform and dense encapsulation facilitates a good color rendering effect in high-temperature glaze, and the chromaticity values of glaze are L* = 35.05, a* = 0.34 and b* = 1.08, respectively. Non-solvent displacement nonaqueous precipitation method might be an extremely promising method for preparing core-shell structural materials.