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Issue 14, 2004
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On the real-structure of biomimetically grown hexagonal prismatic seeds of fluorapatite–gelatine-composites: TEM investigations along [001]

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Abstract

The central parts of hierarchically ordered fractal aggregates of fluorapatite–gelatine-composites consist of an elongated hexagonal-prismatic seed (5–20 µm in length). The X-ray diffraction patterns of the composite-seeds (gelatine-content 2.3 wt.-%) correspond to fluorapatite single crystals, the fracture area perpendicular to the hexagonal axis, however, shows a radial structure completely different to the fracture surface of pure apatite. This observation had already led to the assumption of the formation of a nano-composite-superstructure. Here, we report on a TEM investigation into the real-structure of biomimetically grown seeds of the fractal composite aggregates. Because of the high complexity of the composite system the present work is first of all restricted to observations along [001] only. Compared to a pure inorganic apatite mineral the composite is characterised by a superstructure with average periodicity of about 10 nm. The superstructure seems to be caused by calcified (triple-helical) gelatine molecules (orientation of their long axes || [001] of the composite seed) which act as nucleation centres for highly mosaic-controlled apatite-subareas at nano-scale.

Graphical abstract: On the real-structure of biomimetically grown hexagonal prismatic seeds of fluorapatite–gelatine-composites: TEM investigations along [001]

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Publication details

The article was received on 20 Feb 2004, accepted on 11 May 2004 and first published on 15 Jun 2004


Article type: Paper
DOI: 10.1039/B402627F
J. Mater. Chem., 2004,14, 2218-2224

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    On the real-structure of biomimetically grown hexagonal prismatic seeds of fluorapatite–gelatine-composites: TEM investigations along [001]

    P. Simon, W. Carrillo-Cabrera, P. Formánek, C. Göbel, D. Geiger, R. Ramlau, H. Tlatlik, J. Buder and R. Kniep, J. Mater. Chem., 2004, 14, 2218
    DOI: 10.1039/B402627F

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