Zhang Tingting, Zou Jing, Wang Baomin, Wu Zhenlin, Jia Yuan, Cheeseman Christopher R
Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116023, China.
School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology, Dalian 116023, China.
Materials (Basel). 2018 May 28;11(6):909. doi: 10.3390/ma11060909.
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 (Si 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.
水合硅酸镁（MSH）凝胶是通过氧化镁（MgO）与硅灰（SF）在蒸馏水中反应形成的。MSH的制备采用MgO/SF摩尔比为1.0（重量比40:60）。在室温下对样品进行长达300天的水化过程分析。采用一系列分析技术对MSH进行了表征。使用具有去卷积技术的热重分析（TG/DTG）进行定量分析。通过固态核磁共振（Si NMR）和傅里叶变换红外（FT-IR）光谱对MSH凝胶的结构进行了表征。使用透射电子显微镜（TEM）研究MSH的微观结构。与天然水合硅酸镁矿物相比，MSH凝胶的结构高度无序，在颗粒表面生成，形成具有空洞的壳结构。MSH相的分子结构是层状的。结果还表明，MSH凝胶的聚合程度与水化过程中的溶液pH值有关。
