Ml. Rock et al., CONTROL OF CALCIUM-CARBONATE PARTICLE-SIZE AND SHAPE BY PRECIPITATIONFROM CTAB ALCOHOL/HEXADECANE MIXTURES/, Colloid and polymer science, 275(9), 1997, pp. 893-896
When used as a precipitation media, emulsified mixtures of cetyltrimet
hylammonium bromide/n-butanol (E), hexadecane (O) and water (W), contr
ols the size and shape of calcium carbonate particles. Monodisperse 2-
micron spherical-calcite particles were obtained in a water-rich regio
n of the mixture, while 2-micron rhombohedral-calcite particles with a
n aspect ratio near one were obtained in the middle region of the mixt
ure. Replacing n-butanol with i-butanol led to consistent formation of
monodisperse spherical particles, while using n-propanol in place of
iz-butanol limited the number of spherical particles produced in the w
ater-rich region.