以咪唑-1-乙酸改性壳聚糖(IACS)为生物模板仿合成碳酸钙,探讨了体系pH值和陈化时间等因素对碳酸钙的晶型和形貌的影响,利用场发射扫描电镜(FESEM)、X射线粉末衍射分析仪(XRD)、傅里叶红外光谱分析仪(FT-IR)对所合成的碳酸钙进行表征.结果表明,在纯水体系中所合成单一的立方体方解石晶型,而在组氨酸、咪唑-1-乙酸、咪唑-1-乙酸改性壳聚糖单独体系中则还有球状球霰石晶体呈现.在投加咪唑-1-乙酸改性壳聚糖有机基质体系中,当pH值从6.00升至9.00时,仿生合成球状球霰石的含量从75.9％缓慢降至54.6％;而缩小陈化时间,则有利于形成球霰石晶体.因此,利用IACS有机基质可以有效调控碳酸钙的晶型和形貌,也为仿生合成其它生物矿物提供借鉴.
Imidazole-1-acetic acid grafted chitosan (IACS) was used as the organic matrix for biomimetic synthesis of calcium carbonate.The effects of pH value and aging time on morphology and polymorph of calcium carbonate were investigated.The products were characterized by FT-IR,XRD and FESEM.The result showed the sole rhombohedral calcite was formed in pure water.Whereas the coexistence of spherical vaterite and rhombohedral calcite were gained with adding one of histidine,imidazole-1-acetic acid or imidazole-1-acetic acid grafted chitosan.In presence of IACS,the content of vaterite varied from 0.759 to 0.546 when the pH value increased from 6.00 to 9.00.At the other hand,decreasing the aging time was favourable to the growth of vaterite.The result indicated that IACS was an effective biological template to control the morphology and polymorphs of calcium carbonate.This study could be helpful to offer new method for the biomimetic synthesis of novel biomaterials and understand the mechanism of biomimetic synthesis.
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