纳米材料
材料科学
纳米晶材料
结晶
化学工程
锐钛矿
透射电子显微镜
扫描电子显微镜
水合硅酸钙
石墨烯
晶体结构
纳米技术
纳米晶
晶格常数
结晶学
衍射
复合材料
化学
水泥
光催化
光学
有机化学
物理
催化作用
工程类
作者
Hui Li,Tao Du,Huigang Xiao,Qiangqiang Zhang
摘要
Abstract The poorly crystalline calcium silicate hydrate (C‐S‐H) is the primary binding phase in portland cement concrete. In this paper, the influence of adding anatase phase nano‐TiO 2 , nano‐SiO 2 , graphene oxide ( GO ), and multiwalled carbon nanotubes ( CNT ) on the crystallization and morphology of C‐S‐H are systematically investigated through tests. C‐S‐H gels were prepared using the double decomposition method, and the nanomaterial additions of nano‐TiO 2 , nano‐SiO 2 , GO , and CNT were 2 wt%, 2 wt%, 0.5 wt%, and 0.5 wt%, respectively. X‐ray diffraction ( XRD ) results show that a more crystalline nanostructure of C‐S‐H is induced by the addition of nano‐TiO 2 or GO . This phenomenon is further confirmed by the transmission electron microscopy ( TEM ) observations. The TEM observations demonstrate that C‐S‐H would grow on the crystal face of TiO 2 to form nanocrystalline regions with a lattice fringe spacing of 3.0 Å. When incorporated with GO , it will form a square lattice structure with a lattice constant of 3.1 Å on the surface of GO and later change to the lattice fringe structure with a spacing of 3.1 Å on the region bit away the GO surface. However, when adding nano‐SiO 2 or CNT , these nanocrystalline regions are not observed. Further characterization through scanning electron microscopy ( SEM ) and atomic force microscopy ( AFM ) has been performed to investigate the effect of nanomaterials on C‐S‐H morphology. Different nanomaterials take a different morphology of C‐S‐H: sheet‐shape structures for pure C‐S‐H, rod‐shape with for C‐S‐H with nano‐TiO 2 , and granular agglomeration for C‐S‐H with nano‐SiO 2 . C‐S‐H with GO or CNT forms a structure of C‐S‐H growing on the templates.
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