Synthesis and characterization of an intermediate for C-S-H structure tailoring
Synthesis and characterization of an intermediate for C-S-H structure tailoring
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DOI：
10.1016/j.cemconres.2022.106923
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发表时间：
2022-10
影响因子：
11.4
通讯作者：
Zheyu Zhu;Zhongping Wang;Linglin Xu;Yue Zhou;Yuting Chen;Kai Wu;G. de Schutter
中科院分区：
文献类型：
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作者：
Zheyu Zhu;Zhongping Wang;Linglin Xu;Yue Zhou;Yuting Chen;Kai Wu;G. de Schutter
中间体描述了最终产品之前的阶段，这是纳米尺度结构设计和功能基团裁剪的关键步骤。受此启发，本文首次提出了一种在挥发性有机溶液中制备C-S-H中间体的溶胶-凝胶方法，并对中间体诱导生成具有目标结构的C-S-H的可行性进行了评价。结果表明，TEA和乙醇的挥发引发了C-S-H中间体的形成，其结构为有机和无机硅酸盐链的杂化结构。在NaOH溶液的激发下，C-S-H中间体最终演变成C-S-H凝胶。进化后的C-S-H可以通过激发不同的C-S-H中间体来定制纳米结构。这种进化的C-S-H的特征是tobermorites样纳米晶体的堆积。而这些演化出来的碳硫氢粒子是中空的，它们的外壳包括外层类似碳硫氢的薄片和内部致密的碳硫氢。
The intermediate describes the stage prior to final product, which is the key step for structural design and functional groups tailoring at nanoscale. Inspired by this concept, a sol-gel method for the C-S-H intermediate preparation in volatile organic solution was firstly proposed in this work, and the feasibility of inducing the formation of C-S-H with targeted structure from the intermediates was also evaluated. The results show that the volatilization of TEA and ethanol initiates the formation of C-S-H intermediates, of which the structure is a hybrid of organic and inorganic silicate chains. C-S-H intermediates upon the excitation of NaOH solutions can eventually evolve into C-S-H gels. The nanostructure of evolved C-S-H can be tailored by excitation of different C-S-H intermediates. This evolved C-S-H was characterized by the stacking of tobermorite-like nanocrystals. And those evolved C-S-H particles are hollow shape, and their shell includes outer sheet-resembling C-S-H and inner dense C-S-H.