Nanofibrous Calcite Synthesized via a Solution−Precursor−Solid Mechanism

• Published in: Chemistry of materials Vol. 16; no. 12; pp. 2355 - 2362
• Main Authors: Olszta, Matthew J, Gajjeraman, Sivakumar, Kaufman, Michael, Gower, Laurie B
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 15.06.2004
• Subjects: Applied sciences; Chemistry; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; General and physical chemistry; Physicochemistry of polymers; Physics; Polymers; Inorganic compounds; Organic compounds
• ISSN: 0897-4756; 1520-5002
• DOI: 10.1021/cm035161r

The synthesis of calcite fibers has been confined to nature and is observed most prominently in sea urchin teeth and bacterial deposits. By generating a liquid-phase mineral precursor, induced by the addition of acidic macromolecules to a crystallizing solution, calcite fibers with diameters ranging from 100 to 800 nm have been deposited on existing calcite substrate crystals. A solution−precursor−solid (SPS) mechanism, which has features similar to both the vapor−liquid−solid (VLS) and solution−liquid−solid (SLS) mechanisms, is proposed as the growth mechanism. Because this aqueous-based SPS mechanism occurs under physiological conditions (and down to temperatures as low as 4 °C), it is feasible that it may be used by organisms to form their fibrous biomineral structures. This discovery suggests an interesting link between two seemingly unrelated processes, high-temperature semiconductor fiber formation and biological mineralization.