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Continuous Crystalline Carbonate Apatite Thin Films. A Biomimetic Guofeng Xu,, Ilhan A. Aksay,, and John T. Groves*,,

Summary: Continuous Crystalline Carbonate Apatite Thin Films. A Biomimetic
Guofeng Xu,, Ilhan A. Aksay,, and John T. Groves*,,
Contribution from the Departments of Chemistry and Chemical Engineering, Princeton Materials Institute,
Princeton UniVersity, Princeton, New Jersey 08544
ReceiVed July 12, 2000
Abstract: In contrast to extensive studies on hydroxyapatite thin films, very little has been reported on the
thin films of carbonated apatite (dahllite). In this report, we describe the synthesis and characterization of a
highly crystalline dahllite thin film assembled via a biomimetic pathway. A free-standing continuous precursor
film of carbonated calcium phosphate in an amorphous phase was first prepared by a solution-inhibited templating
method (template-inhibition) at an air-water interface. A stearic acid surface monolayer acted as the template,
while a carbonate-phosphate solution composed a binary inhibition system. The precursor film formed at the
air/water interface was heated at 900 C and transformed into a dense crystalline film that retained the overall
shape of the precursor. The crystalline phase was characterized by XRD and IR to be a single-phase carbonate
apatite, with carbonate substitutions in both type A (OH-) and type B (PO4
3-) lattice positions.
Due to its importance in biomedical research, hydroxyapatite
has been subjected to extensive studies.1 In particular, much
interest has been drawn to studies of hydroxyapatite thin films


Source: Aksay, Ilhan A. - Department of Chemical Engineering, Princeton University
Groves, John T. - Department of Chemistry, Princeton University


Collections: Chemistry; Materials Science