Biomimetic Synthesis of Calcium Carbonate Polymorphs Using the Lamellar Lyotropic Liquid Crystalline Systems of Calcium Dodecyl Sulfate

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• 作者：Qiang Shen ; Liancheng Wang ; Xinping Li ; Fenglin Liu
• 刊名：Crystal Growth & Design
• 出版年：2008
• 出版时间：October 1, 2008
• 年：2008
• 卷：8
• 期：10
• 页码：3560-3565
• 全文大小：436K
• 年卷期：v.8,no.10(October 1, 2008)
• ISSN：1528-7505

文摘

Lyotropic liquid crystalline phases have immediate relevance in biology because of the prevalence of organized lipid structures in living systems. The incorporation of hydrophilic reagents in water domains with well-defined nanoscale geometry favors the construction of nanostructured materials of inorganics, and/or the inorganic−organic hybrids. In this paper, the lamellar mesophases composed of calcium dodecyl sulfate (CDS), n-pentanol, and ammonia (5 wt% NH₃·H₂O in water) were constructed and used as the precipitation media of calcium carbonate (CaCO₃). Under the atmosphere of carbon dioxide gas, the occurring solid−liquid−gas reaction resulted only in rhombohedral calcite particles at the beginning, then ultimately in layer-cake aggregates of calcite and stick-bundle aggregates of aragonite. Furthermore, the aragonite content increased with the proceeding time interval of the three-phase reaction, indicating a special crystallization habit of CaCO₃ in the lamellar mesophases of CDS. Aside from these, the influence of the structure of CDS lamellar mesophases on the formation of CaCO₃ crystals is also discussed. These imply an effective biomimetic approach for the simultaneous fabrication of metastable aragonite and thermodynamically stable calcite under mild conditions.