PREPARATION AND PROPERTIES OF UNIFORM AMORPHOUS AND CRYSTALLINE COLLOIDAL NICKEL SULFIDE

摘要

Amorphous spherical particles of nickel sulfide of 10 nm in diameter were synthesized by the controlled double-jet precipitation (CDJP) technique using nickel sulfate and sodium sulfide. Cubic crystalline particles of similar to 200 nm were obtained by aging dispersions of amorphous particles at 80 degrees C for more than a week, as long as the pH was kept between 3 and 3.5. Electrokinetic mobilities of these particles are reported, as well as color properties of their dispersions in liquids and in poly(vinyl alcohol) films are described. [References: 26]