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By Montano B. C.

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Fibers drawn from a viscous dextran so- 28 H. Cölfen lution with silicalite nanoparticles led to aligned silicalite nanocrystal fibers, with subsequent removal of the dextran template [216]. A similar approach, but with a dextran sulfate solution template and amino-acid coated hydroxyapatite nanoparticles, could be used to generate hydroxyapatite sponges, which showed promising properties for cartilage and soft tissue engineering [218]. Elevated temperatures were also applied in a hydrothermal approach using starch and other polysaccharides for the production of carbon-coated silver nanocables with remarkably uniform core and shell diameters and interconnection points [219].

26 H. 1 Biopolymers The application of biopolymers as mineralization additives is a natural bioinspired choice due to their role in biomineralization processes. However, biomineralization processes are very complex and usually involve a structural (insoluble) and functional (soluble) matrix. Commonly, the structural matrix is neglected and investigations focus on the soluble crystallization additives. In vitro experiments with biopolymer additives have so far commonly failed to reproduce the complex biomineral shapes.

In recent years, hydrophilic biopolymers and various synthetic polymers have been widely used for polymer-controlled crystallization and morphosynthesis of different inorganic minerals with still increasing application fields. The principle of controlled crystallization and morphosynthesis in the presence of a soluble polymer not forming a self-assembled superstructure is completely different from the transcriptive template effect provided by predesigned artificial polymer matrices or templates. The structure formation relies on a synergetic effect of the mutual interactions between functionalities of the polymers and inorganic species, and the subsequent reconstruction in a “programmed” or “coded” way [35, 40, 146].

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