材料科学
成核
化学工程
降水
胶结(地质)
碳酸盐
分子
碳酸钙
磷灰石
无定形碳酸钙
热重分析
无机化学
有机化学
化学
复合材料
冶金
水泥
工程类
物理
气象学
作者
Trinh Thao My Nguyen,Shan Hazoor,T.T. Vuong,LeMaur Kydd,Ian Shortt,Frank W. Foss,Erika Callagon La Plante
标识
DOI:10.1021/acsami.4c04218
摘要
Cementation in construction materials primarily relies on the aqueous precipitation of minerals such as carbonates and silicates. The kinetics of nucleation and growth play a critical role in the development of strength and durability, yet our understanding of the kinetic controls governing phase formation and porosity reduction in cements remains limited. In this study, we synthesized bisphosphonate molecules with varying alkyl chain lengths and functional groups to investigate their impact on calcium carbonate precipitation. Through conductivity measurements, infrared spectroscopy, and thermogravimetric analysis, we uncovered the selective formation of polymorphs and the specific incorporation of these molecules within the carbonate matrix. Further, in situ atomic force microscopy revealed that these molecules influenced the morphology of the precipitates, indicating a possible effect on the ionic organization through sorption mechanisms. Interestingly, amorphous calcium carbonate (ACC), when formed in the presence of bisphosphonates, showed metastability for at least seven months without inhibiting further calcium carbonate precipitation. Our research sheds light on the diverse mechanisms by which organic additives can modify mineral nucleation and growth, offering valuable insights for the control and enhancement of carbonate-based cementation processes.
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