The morphological control of calcium carbonate (CaCO3) colloidal particles, which allows us to obtain specific material properties, is one of the key challenges in various applications. To this end, we have studied the formation of CaCO3 particles by adding different long chain fatty acids lauric acid, palmitic acid and stearic acid into calcium hydroxide (Ca(OH)(2)) slurry, and then, by dispersing carbon dioxide (CO2) gas into the slurry via a micropore plate. Their polymorph, morphology and surface feature were characterized by XRD, TEM and FTIR, respectively. It is shown that the crystalline phase of CaCO3 particles leaves unchanged with respect to the used species and amounts of fatty acids, what is changed is the shape of CaCO3 particles from nano-cubic to micro-spindle. Thus we underlined the tuning mechanism of precipitation. (C) 2014 Elsevier B.V. All rights reserved.