We designed CaCO₃ films comprised of aragonite nanorods by mimicking the microstructure and the formation process of the calcareous skeleton of a stony coral in the sea. Hierarchically structured calcareous frameworks are produced from the center of calcification (COC) under alkaline conditions in the organism. In the first step, a seed layer consisting of crystalline nanoparticles was produced as an artificial COC on a polyvinyl alcohol sheet in a solution containing Ca²⁺ ions, polyacrylic acid, and a biogenic polyamine, such as putrescine, through the gradual absorption of atmospheric CO₂. In the second step, aragonite nanorods grew on the artificial COC in the mother liquid obtained by mixing a putrescine solution saturated with CO₂ and a CaCl₂ solution containing Mg²⁺ and alginate. Finally, we obtained a dense, homogeneous film consisting of aragonite nanorods similar to the coral skeleton through the fixation of CO₂.

中文翻译：

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利用生物多胺捕获的二氧化碳模拟珊瑚生产文石膜

我们通过模仿海洋石珊瑚钙质骨架的微观结构和形成过程，设计了由文石纳米棒组成的CaCO ₃薄膜。在生物体的碱性条件下，钙化中心（COC）产生分层结构的钙质框架。第一步，在含有 Ca ²⁺离子、聚丙烯酸和生物多胺（例如腐胺）的溶液中，通过逐渐吸收大气中的二氧化碳，在聚乙烯醇片上产生由晶体纳米粒子组成的种子层作为人造 COC。二氧化碳₂。在第二步中，文石纳米棒在通过将饱和CO ₂腐胺溶液与含有Mg ²⁺和藻酸盐的CaCl ₂溶液混合而获得的母液中的人造COC上生长。最后，通过CO ₂的固定，我们获得了由类似于珊瑚骨架的文石纳米棒组成的致密、均匀的薄膜。