Hydrophobic Properties of Calcium-Silicate Hydrates Doped with Rare-Earth Elements
Hydrophobic Properties of Calcium-Silicate Hydrates Doped with Rare-Earth Elements
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DOI：
10.1021/acssuschemeng.8b03244
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发表时间：
2018-11-05
影响因子：
8.4
通讯作者：
Thissen, Peter
中科院分区：
文献类型：
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作者：
Burek, Katja;Krause, Felix;Thissen, Peter
在这项研究中，运输过程和表面化学的钙硅酸盐水合物（CSH）相之间的明显关系进行了研究。为此目的，开发了一种方法来合成C4CSH相，以用作模型基板，通过引入铕（Eu（III）），其结构的具体修改。通过红外光谱（IR）、X射线光电子能谱（XPS）和时间分辨激光荧光光谱（TRLFS），观察了Eu（III）掺杂过程中的结构和化学变化。CSH相的这些改变导致了表面化学的显著变化，并因此导致与水的相互作用中的相当大的变化，如通过测量改性模型衬底上的接触角所证明的。我们的研究结果提供了一个更深刻的分子理解水泥基系统中的反应性运输过程的基础。此外，这些结果拓宽了改善水泥基材料稳定性的前景，水泥基材料通过对CSH相进行有针对性的改性而受到侵蚀性水环境的影响。
In this study, the apparent relationship between the transport process and the surface chemistry of the Calcium-Silicate Hydrate (CSH) phases was investigated. For this purpose, a method was developed to synthesize ultrathin CSH phases to be used as a model substrate with the specific modification of their structure by introducing europium (Eu(III)). The structural and chemical changes during this Eu(III)-doping were observed by means of infrared spectroscopy (IR), X-ray photoelectron spectroscopy (XPS), and time-resolved laser fluorescence spectroscopy (TRLFS). These alterations of the CSH phases led to significant changes in the surface chemistry and consequently to considerable variations in the interaction with water, as evidenced by measurements of the contact angles on the modified model substrates. Our results provide the basis for a more profound molecular understanding of reactive transport processes in cement-based systems. Furthermore, these results broaden the perspective of improving the stability of cement-based materials, which are subjected to the impact of aggressive aqueous environments through targeted modifications of the CSH phases.