Biomimetic synthesis of calcium carbonate bilayers interfaced by a diblock copolymer template

The synthesis of a new class of hybrid materials with two differently oriented layers of calcite at adjacent sides of an organic template is demonstrated. A Langmuir monolayer of the amphiphilic block copolymer poly(butyl acrylate)-b-poly(hydroxypropyl acrylate) directs the formation of a first CaCO3 phase through interaction with the hydrophilic poly(hydroxyporpyl acrylate) blocks. After partial hydrolysis of the hydrophobic poly(buty acrylate) segments a second CaCO3 phase is formed on the monolayer, associated to the first mineral phase. Thus, bi-layered CaCO3-based hybrid materials are obtained with two differently oriented calcite phases at opposite sides of the polymer film. By using DNA as an additive the crystal orientation in the second layer can be modified.