Journal
BIOMATERIALS
Volume 25, Issue 2, Pages 277-282Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0142-9612(03)00526-X
Keywords
biomimetic material; biomineralization; calcite; crystallization; hydrogel; nanocomposite
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Poly-acrylamide hydrogels were modified by copolymerization with acrylic acid and used as growth medium for CaCO3 in a double-diffusion arrangement. The carboxylate functionalities in the gel network facilitate the nucleation of a multitude of small crystallites of vaterite and calcite, which are temporarily stabilized even while supersaturation is increasing within the hydrogel. After an extended induction period the rapid spherulitic growth of calcite crystals along their c-axis is observed yielding spheres with diameters exceeding 300 mum. In the center of those aggregates disordered, porous regions can be identified as starting point of this rapid crystallization. The results are compared to previous studies on native poly-acrylamide hydrogels and networks modified with -SO3H functional groups. The mineralization mechanism is significantly altered by specific interactions between the -COOH functionalized network and the evolving mineral phase. (C) 2003 Elsevier Ltd. All rights reserved.
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