镁离子与蛋清蛋白协同调控下文石亚微米束的仿生合成

Biomimetic Synthesis of Aragonite Submicron Beams Synergistically Regulated by Magnesium Ions and Egg-white Protein

以蛋清蛋白作为有机基质,Mg^2+作为无机离子,研究了蛋清蛋白和Mg^2+对碳酸钙仿生矿化过程的协同诱导作用,并对矿化产物进行了XRD,FT-IR和SEM表征。结果表明,在两者的共同作用下,通过控制实验参数,采用直接沉淀和气体扩散两种矿化方法均可获得纯文石相CaCO3亚微米束,但两种方法的制备条件和亚微米束的致密度存在一定的差异。分析了蛋清蛋白和Mg^2+对碳酸钙仿生矿化过程的调控机制:在亚微米束形成过程中,镁离子的作用是促进文石相CaCO3的成核与生长,而蛋清蛋白分子主要功能是对镁离子诱导形成的文石型CaCO3粒子进行组装并最终得到亚微米束。

Egg-white protein was used as the organic matrix and Mg^2+as the inorganic ion,their synergistic regulation on the biomimetic mineralization of calcium carbonate was studied,and the mineralized products were characterized by XRD,FT-IR and SEM.The results show that under the combined actions of the two,both direct precipitation method and gas diffusion method can be used to obtain pure aragonite CaCO3 submicron beams by controlling the experimental parameters.However,there are some differences in the preparation conditions of the two methods and the density of their submicron beams.The mechanism analysis shows that in the process of submicron beam formation,magnesium ions promote the nucleation and growth of aragonite CaCO3,and egg-white protein molecules assemble aragonite CaCO3 particles to form submicron beams.The research can enrich the mineralization theory of nacre and provide a new method for the preparation of biomimetic nacre materials.