title: Highly-ordered layered organo-mineral materials prepared via reactions of n-alkylphosphonic acids with apatite.
abstract: This work describes a novel class of layered organo-mineral materials manufactured via a single-step solution-phase reaction of n-alkylphosphonic acids (CnH(2n+1)P(O)(OH)2) with calcium hydroxyapatite mineral (CaHAP). TEM, SAXS, WAXS, FTIR, and Vapor Phase Adsorption data suggest that these alkyl-CaHAP materials present a surface-modified CaHAP matrix coated with ordered layers of calcium alkylphosphonates that are strongly adhered to the surface. Interlayer spacing increases from 1.47 (C3-CaHAP) to 4.77 nm (C18-CaHAP). According to FTIR, ordering of alkyl chains improves with the alkyl chain length. The organic loads in these alkyl-CaHAP can be controlled over a wide range (up to approximately 60%) by varying alkyl chain and the concentration of alkylphosphonic acids in the solution.
authors.affiliation: Chemistry Department, State University of New York, Stony Brook, NY 11794, USA.
authors.forename: Mikhail Y
authors.initials: MY
authors.lastname: Gelfer
authors.forename: Christian
authors.initials: C
authors.lastname: Burger
authors.forename: Benjamin S
authors.initials: BS
authors.lastname: Hsiao
authors.forename: Susan C
authors.initials: SC
authors.lastname: D'Andrea
authors.forename: Alexander Y
authors.initials: AY
authors.lastname: Fadeev