Structural and morphological modifications of hydroxyapatite-polyaspartate composite crystals induced by heat treatment by A. Bigi, E. Boanini, M. Gazzano, and K. Rubini

Crystal Research and Technology

Cryst. Res. Technol. 40, 1094 (2005) - Abstract -

Structural and morphological modifications of hydroxyapatite-polyaspartate composite crystals induced by heat treatment

A. Bigi, E. Boanini, M. Gazzano*, and K. Rubini

Dipartimento di Chimica “G. Ciamician”, via Selmi 2, 40126 Bologna, Italy
*Istituto per la Sintesi Organica e la Fotoreattività – CNR - via Selmi 2, 40126 Bologna, Italy

Keywords	apatite, composite crystals, polyaspartate, heat treatment, X-ray diffraction
PACS	81.10.-h
DOI	10.1002/crat.200410493

Hydroxyapatite - poly-L-aspartic acid (HAPASP) composite crystals at different PASP content up to 8 %wt were prepared by direct synthesis in aqueous solution. The samples were characterized by WAXS, TEM, TGA, FTIR and chemical analyses before and after heat treatment at different temperatures in the range 400-1100°C. PASP denaturation and combustion induced by heat treatment provoke an anisotropic increase of the coherent length of the perfect crystalline domains and of the mean crystal dimensions. The extent of these anisotropic modifications increases on increasing the heat treatment temperature. The results provide further evidence of a preferential interaction of PASP with the HA crystal faces parallel to the c-axis direction.

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