亚稳态球霰石相碳酸钙的调控制备进展

Progress in Tuning of Metastable Vaterite Calcium Carbonate

球霰石以其独特的机械、物理和化学性能,在日用品与生物医学等领域表现出广阔的应用前景。然而在三种无水碳酸钙晶体中,球霰石的热力学性能最不稳定,在后续的反应和处理过程中常常转变为更稳定的文石或方解石,因此如何抑制球霰石向稳定晶型转变一直都是碳酸钙领域研究的热点。本文在概述了球霰石晶体结构、性质、应用及其转化途径的基础上,以碳酸钙的三种基本制备体系为线索,综述了碳化法、复分解法、微乳液法和溶剂热法等传统方法以及自组装单分子膜法、仿生合成法和热分解法等一些新型调控制备球霰石相方法的研究进展,还就利用添加剂促进球霰石形成与稳定的相关机制加以剖析。文章旨在为球霰石相碳酸钙的有效制备提供理论和实践的参考。

Vaterite has broad application prospects in the field of daily necessities and biomedical science because of its unique mechanical, physical and chemical properties. However, vaterite is the thermodynamically least stable phase in the three anhydrous crystalline phases of calcium carbonate, and such thermal metastability often transforms it into more stable aragonite or calcite phases, so how to inhibit the phase transformation of vaterite is always a hot topic in the study of calcium carbonate. In this paper, structure, properties, application, and phase transformation from vaterite to aragonite and/or calcite are briefly introduced. Particularly, based on the three basic routes of synthesis of calcium carbonate, some traditional methods, such as carbonization, double decomposition, microemulsion, solvothermal method, and some latest progress, e.g. self-assembly of monolayer, biomimetic synthesis and thermal decomposition methods of tuning and preparation on vaterite are then summarized. Moreover, some analysis on the mechanism of formation and stabilization of vaterite by some additives are given. The aim of this review is to provide a more systematic theoretical and practical guidance to fabrication vaterite phase of calcium carbonate.