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Structural and morphological modifications of hydroxyapatite‐polyaspartate composite crystals induced by heat treatment
Author(s) -
Bigi A.,
Boanini E.,
Gazzano M.,
Rubini K.
Publication year - 2005
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200410493
Subject(s) - crystal (programming language) , composite number , anisotropy , aqueous solution , fourier transform infrared spectroscopy , chemical engineering , thermal treatment , crystal structure , chemistry , materials science , atmospheric temperature range , crystallography , nuclear chemistry , composite material , organic chemistry , thermodynamics , optics , physics , computer science , programming language , engineering
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. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)