Adsorption and structural properties of hydroxy- and new lacunar apatites

This study examines the impact of the synthesis conditions on the physico-chemical properties and on the surface reactivity of the prepared materials. The analysis of the interactions of the samples with respect to a protein model (Bovin Serum Albumin), evaluated under the same experimental conditions, revealed a fast-kinetic process for the precipitated samples, compared to the crystals obtained by solid chemical reaction. Thus, the equilibrium conditions were reached in less than 20 min for the former while 6 h of contact were requested for the latter. However, all the obtained isotherms show a Langmuirian shape. The difference in the adsorption parameters of the materials, i.e. constant affinity and amount adsorbed at saturation, is discussed in terms of surface characteristics, chemical composition, crystals size and specific surface area. It is concluded that the interaction with the Bovin Serum Albumin (BSA) molecules is highly sensitive to the microstructure of the crystals.Graphical abstractComparison between synthesized apatites with empty and occupied tunnels along c axis.
Source: Journal of Molecular Structure - Category: Molecular Biology Source Type: research