Surfaces and Interfaces for bioinspired calcium phosphate hybrid materialsWednesday (10.05.2017) 10:20 - 10:40 Part of:
Surfaces and interfaces are important when it comes to controlling the initial steps of mineral deposition. We have in the recent past focused on polymer and surfactant monolayers to elucidate individual steps of calcium phosphate mineralization. The presentation will introduce a new dendritic model amphiphile for these studies. The amphiphile forms stable monomolecular films at the air-liquid interface on different subphases. Furthermore, the mineralization of calcium phosphate (CP) beneath the monolayer at different calcium and phosphate concentrations vs. mineralization time shows that at low calcium and phosphate concentrations needles form, whereas flakes and spheres dominate at higher concentrations. Energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy and electron diffraction confirm the formation of calcium phosphate. High resolution TEM and electron diffraction confirm the predominant formation of octacalcium phosphate (OCP) and hydroxyapatite (HAP). The data also indicate that the final products form via a complex multistep reaction, including an association step, where nanonedles aggregate into larger flake-like objects.