Hydrothermal Synthesis and Characterization of Fluorine-Doped Calcium Silicate Hydrate

Herein, we report the hydrothermal synthesis and detailed characterization of fluorine-doped calcium silicate hydrate (F-CSH). The synthesized material were characterized by several techniques, i.e., X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared (FTIR) spectroscopy. The detailed studied revealed that the sodium fluoride was beneficial to promote the growth of gyrolite but prevent the formation of plate-like 14 Å tobermorite. The produced CaF2 affects the appearance and shape of the material. The XRD results confirmed that the constitution and structure of CSH are different from those of F-CSH which can generate the phase of gyrolite. Finally, the modification mechanism of F-CSH was primarily analyzed and discussed in this paper. This research is of great significance in the preparation and characterization of various fluorine-doped inorganic compounds.