Preparation Conditions for Aragonite Whiskers by Carbonation Process

Abstract

Calcium carbonate whiskers (aragonite phase) are prepared by blowing CO2 gas into the suspension consisting of Ca(OH)2-added MgCl2 aqueous solution. The shape and crystalline phase of CaCO3 depend on the preparation conditions. The optimum conditions for preparing the aragonite whiskers were determined. The whiskers have high aspect ratios ranging from 20 to 40 with diameters of 0.5-2μm. A simple method for preparing aragonite whiskers by applying a carbonation process using MgCl2 aqueous solution was developed.