Fabrication of hollow porous shells of calcium carbonate from self-organizing media
Fabrication of hollow porous shells of calcium carbonate from self-organizing media
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DOI：
10.1038/377320a0
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发表时间：
1995-09
期刊：
影响因子：
64.8
通讯作者：
D. Walsh;S. Mann
中科院分区：
文献类型：
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作者：
D. Walsh;S. Mann
自然界中产生了大量由无机材料组成的精细的微观骨骼结构。这种复杂的三维结构，如果合成生产，可以找到重要的应用，如轻质陶瓷，催化剂载体，生物医学植入物和高温分离技术的坚固膜。在这里，我们描述了一种合成结晶碳酸钙（文石）中空多孔壳的方法，这种壳类似于某些海藻的球珠。我们发现，薄的细胞框架的介孔或大孔文石可以形成从油-水-表面活性剂微乳液过饱和与碳酸氢钙，与由水和油的相对浓度确定的孔径。使用微米级聚苯乙烯珠作为微乳液的基底，可以产生蜂窝结构的中空球壳。我们提出，这些细胞框架起源于快速矿化的文石，与自组织的泡沫油滴作为一个结构模板，并建议类似的过程可能是在材料化学的普遍重要性。
A RICH variety of elaborate microscopic skeletal structures composed of inorganic materials are produced in nature1. Such complex, three-dimensional structures, if produced synthetically, could find important applications as light-weight ceramics, catalyst supports, biomedical implants and robust membranes for high-temperature separation technology. Here we describe a method for synthesizing hollow porous shells of crystalline calcium carbonate (aragonite) that resemble the coccospheres of certain marine algae. We show that thin cellular frameworks of either mesoporous or macroporous aragonite can be formed from oil–water–surfactant microemulsions supersaturated with calcium bicarbonate, with the pore size determined by the relative concentrations of water and oil. Using micrometre-sized polystyrene beads as the substrate for the microemulsion, hollow spherical shells of the honeycomb architecture can be produced. We propose that these cellular frameworks originate from rapid mineralization of aragonite, with a self-organized foam of oil droplets acting as a structural template, and suggest that similar processes could be of general importance in materials chemistry.