Carbonation Competing Functionalization on Calcium-Silicate-Hydrates: Investigation of Four Promising Surface-Activation Techniques
Carbonation Competing Functionalization on Calcium-Silicate-Hydrates: Investigation of Four Promising Surface-Activation Techniques
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DOI：
10.1021/acssuschemeng.6b00870
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发表时间：
2016-05
影响因子：
8.4
通讯作者：
Nicolás Giraudo;P. Thissen
中科院分区：
文献类型：
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作者：
Nicolás Giraudo;P. Thissen
在这项研究中，在硅晶片上制备了由碳酸钙部分封端的水化硅酸钙（C-S-H）相。首先，进行了密度泛函理论（DFT）分析，以定义结构稳定的碳酸盐的性质，得出的结论是表面上存在两种不同的碳酸盐。然后，通过四种不同的实验处理技术，通过处理碳酸酯末端来活化C-S-H相：（1）UV光（365 nm）辐射作为时间的函数，（2）在室温（RT）和840 ℃之间直接加热，（3）通过具有作为时间的函数的限定pH值的水溶液进行湿化学处理和（4）Ar/O2等离子体处理。实施傅里叶变换红外（FTIR）光谱以确认每种方法成功地减少了C2C-S-H相的碳酸酯终止。有趣的是，不同处理对C-S-H相的影响是非常不同的。紫外线...
In this study, ultrathin calcium-silicate-hydrate (C-S-H) phases on silicon wafers were prepared, which are partially terminated by calcium carbonates. First, a density functional theory (DFT) analysis was performed, to define the nature of the carbonates that are stable in the structure, concluding that two different kinds of them will be present on the surface. Then, by means of four different experimental handling techniques, the C-S-H phases were activated by disposing the carbonate termination: (1) UV-light (365 nm) radiation as a function of time, (2) direct heating between room temperature (RT) and 840 °C, (3) wet chemical treatment by an aqueous solution with a defined pH value as a function of time and (4) Ar/O2-plasma treatment. Fourier transform infrared (FTIR) spectroscopy was implemented to confirm that every method successfully reduced the carbonate termination of the ultrathin C-S-H phases. Interestingly, the effects of the diverse treatments on the C-S-H phases are very different. UV-light...