Abstract
The formation of calcium carbonate films has been achieved in aqueous solutions containing specific polymers such as poly (acrylic acid) (PAA). However, details of the formation mechanism were not clarified. In this study, morphological variation of calcium carbonate crystals was investigated by changing the concentration and molecular weight of coexisting PAA. Low weight PAA (Mw:2,000) induced fibrillation of calcite with adsorption on the surfaces parallel to the c axis. In this case, we obtained indefinite aggregates of calcite on a glass plate. In contrast, coexistence of high weight PAA (Mw:250,000) formed calcite films on the surface. Adhesiveness of the crystals was improved by high weight PAA anchored on the surface. We found parallelogram plates and sharp horns of calcite on a glass with the combination of low and high weight PAAs by the adhesive effect on the substrate and moderate suppression of crystal growth.
