Characterization of Magnesium Silicate Hydrate (MSH) Gel Formed by Reacting MgO and Silica Fume

Materials
Tingting ZhangChristopher R Cheeseman

Abstract

Magnesium silicate hydrate (MSH) gel was formed by reacting magnesium oxide (MgO) with silica fume (SF) in distilled water. The MSH was prepared using a MgO/SF molar ratio of 1.0 (40:60 weight ratio). Samples were analyzed during hydration process up to 300 days at room temperature. The MSH characterization has been carried out using a range of analytical techniques. Quantitative analysis was achieved using thermogravimetric analysis (TG/DTG) with a de-convolution technology. The structure of MSH gel was characterized using solid state nuclear magnetic resonance (29Si NMR) and Fourier transform infrared (FT-IR) spectroscopy. Transmission electron microscopy (TEM) was used to investigate MSH microstructure. Compared with natural magnesium silicate hydrate minerals, the structure of MSH gel is highly disordered and generates on the surface of particles, producing a shell structure with cavity. The molecular structure of MSH phase is layered. The results also show that the extent of polymerization of MSH gel is related to the solution pH during hydration.

References

Apr 1, 2006·Waste Management·Eric C Gaucher, Philippe Blanc
Apr 3, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Sam A WallingJohn L Provis
Jan 20, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·M TonelliP Baglioni

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Methods Mentioned

BETA
nuclear magnetic resonance
X-ray
NMR
infrared spectroscopy
transmission electron microscopy

Software Mentioned

SeaSolve
PeakFitv4

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