材料期刊网

本文利用生物矿化原理,首次在常温常压下以竹蛏韧带纤维状蛋白质层为基底,采用气体扩散法,通过氯化钙溶液和二氧化碳反应制备了纳米文石晶体且具有捆状和球状超结构。并通过红外光谱、扫描电镜、X射线衍射对产物的晶型、形貌及物相进行了详细表征,并初步探讨了文石晶体形成及生长机理。结果表明,采用该反应体系可以在较大的条件范围内合成出纯文石。文石晶体生长为分裂式生长,其形成机理为竹蛏韧带纤维状蛋白质中天冬氨酸的β-羧基所带负电荷之间的距离与文石晶格中Ca2＋之间的距离匹配。本文不但对深入探讨碳酸钙的生物矿化机理具有重要意义,同时提供了一种简单高效节能的合成球状纯文石材料的新方法。

Here,using the fibrous protein from Solen grandis ligament as a template,we firstly synthesized pure aragonite crystals with sheaf and spherical superstructures via gas diffusion method at ambient condition.These as-synthesized crystals were characterized by Fourier transform infrared（FTIR） spectroscopy,scanning electron microscopy（SEM）,X-ray diffractometry（XRD）,and their formation and growth mechanisms were discussed.The results show that,using this reaction system,pure aragonite crystals can be synthesized in wide conditions.Additionally,we proposed that the aragonite crystals grow through unusual splitting manner.Further,we believed that the aragonite polymorph is controlled by the distance between negative charges of β-carboxyl in aspartic acid of fibrous protein from S.grandis ligament,which nearly matches the distance between Ca2＋ ions in aragonite crystals.This work is not only of great significance for further understanding CaCO3 biomineralization mechanism but also provides a new but easy and energy-saving method for synthesizing pure spherical aragonite materials.