Structural control of calcium carbonate crystals precipitated on organic thin films

Abstract

Calcium carbonate crystals were precipitated on a polymerized 10, 12-pentacosadiynoic acid (PDA) film from solution in which [Mg²⁺]/[Ca²⁺] ratio was about 10. Calcite crystals precipitated on the PDA film, and the c-axes in the precipitates were perpendicular to the polymerization direction of the LB film. The regulated features of inorganic/organic interfaces can control the crystallographic directions of inorganic materials. The precipitates grown from the solution containing Sr²⁺ ion were aragonite crystals and they were randomly oriented.