Preparation of calcium deficient hydroxyapatite on the montmorillonite substrate: Structure and morphology

Abstract

Ca-deficient hydroxyapatite (CDH) is biocompatible and inexpensive material used for biomedical and non-biological applications. Due to similarity of CDH with human hard tissues is suitable for manufacturing of bone substituents. Clay minerals are natural materials often used as substrate for nanoparticles anchoring. Excellent combination of non-toxic clay minerals and CDH is just right composition for medical or catalytic applications.Aim of the study was to prepare CDH on the surface of monoionic Na- and Mg-form of montmorillonite (Mt) from Czech Republic. The CDH was prepared using precipitation methods under constant mixing or sonication conditions. XRD analysis confirmed successful creation of CDH on the Mt substrate. Bonding interactions between Mt and CDH were not found using FTIR methods. Using scanning electron microscopy, the presence of CDH particles on Mt surface was observed where the CDH creates film-like layer of small particles. The specific surface of nanocomposites is large, which is demanded for medical or catalytic applications. The results revealed that montmorillonite is appropriate as support for CDH particles.