以L-组氨酸为模板仿生合成针状纳米碳酸钙

依据仿生合成原理, 以L-组氨酸为有机基质, 无水氯化钙和无水碳酸钠为原料, 通过简单的复分解反应制备出了平均直径约为80 nm, 长径比约为12∶1的针状纳米碳酸钙晶体. 利用高分辨扫描电子显微镜(FESEM)、X射线衍射仪(XRD)、傅里叶红外光谱议(FTIR)对产物进行了表征, 结果表明, 在不添加有机基质的溶液中得到立方状微米级的碳酸钙晶体, 添加L-组氨酸后得到针状纳米级的碳酸钙晶体, 并对L-组氨酸在仿生合成针状纳米碳酸钙过程中的作用机理进行了初步探讨.

Biomimetic Synthesis of Needle-shaped Nano-CaCO_3 Particles with L-Histidine as the Template

Based on the theory of biomimetic synthesis, well dispersed needle-shaped nano-CaCO3 particles with an average width of 80 nm and a ratio of diameter to length about 1∶12 were synthesized via a simple precipitation reaction of Na2CO3 with CaCl2 in the presence of L-histidine. The products were characterized by field emission scanning electron microscopy(FESEM), X-ray diffraction(XRD), fourier transform infrared spectroscopy(FTIR) and whiteness meter. The results show that needle-shaped nano-CaCO3 crystals are obtained in the presence of L-histidine. Whereas, only cubic micron CaCO3 crystals were obtained without L-histidine. Due to its nano-size, high oil-absorbed value and high whiteness, the needle-shaped nano-CaCO3 particle was expected to be used as the filler for high-grade paper products, such as carbon paper, handkerchief paper, printing paper, etc.