PVA控制合成球形碳酸钙

Synthesis of Spherical CaCO_3 by Polyvinyl Alcohol as Additive

利用聚乙烯醇(PVA)作为有机基质,控制适当的反应条件,模拟碳酸钙的生物矿化,进行仿生合成,制备出了球霰石型的碳酸钙球形晶体.研究了PVA浓度、CaCl2浓度及温度对碳酸钙结晶的影响,表明在给定条件下通过调节PVA的浓度可成功地诱导碳酸钙晶体取向生长形成球形,降低CaCl2的浓度可使形成的球形晶体颗粒增大,改变温度会使球形晶体的表面结构发生变化,可为合成新型材料提供一定的参考意义.

Vaterite type of CaCO3 spherical crystal is bionically synthesized with polyvinyl alcohol as organic basic substance, by controlling the appropriate reaction conditions, simuolating the biological mineralization of CaCO3. The effects of PVA, CaCl2 and temperature on the morphology of CaCO3 are investigated. It is found that in the given conditions, CaCO3 crystal can be successfully induced to grow into a spherical crystal by adjusting the PVA concentration, the size of vaterlte becomes larger when the CaCl2 concentration is decreased, surface structure of vaterite can be changed when temperature is changed. This may be referenced to synthesis novel materials.