Chemical structure and complex growth modes of magnesium silicate hydrate: Nanoparticle orientation, aggregation, and fusion
Chemical structure and complex growth modes of magnesium silicate hydrate: Nanoparticle orientation, aggregation, and fusion
复制标题
DOI：
10.1016/j.cemconres.2023.107367
复制
发表时间：
2024-01
影响因子：
11.4
通讯作者：
Dylan Singh;Trinh Thao My Nguyen;Evann Bustamantes;Abdul Wahab;Ahmad Hamzah Yousaf;Ian Shortt;Frank W. Foss;Maria Konsta-Gdoutos;Sang Soo Lee;Erika Callagon La Plante
中科院分区：
文献类型：
--
作者：
Dylan Singh;Trinh Thao My Nguyen;Evann Bustamantes;Abdul Wahab;Ahmad Hamzah Yousaf;Ian Shortt;Frank W. Foss;Maria Konsta-Gdoutos;Sang Soo Lee;Erika Callagon La Plante
水合硅酸镁（MSH）在建筑中的应用程度有限，部分原因是确定其沉淀动力学的数据不足。在此，分析在镁与硅溶液摩尔浓度比（[Mg]/[Si] = 0.5-1.5）和温度= 25-80 °C的范围内均匀或非均匀生长的MSH的化学结构和形态。红外光谱和地球化学模拟表明，增加[Mg]/[Si]比的结果在MSH硅酸盐聚合较少。原子力显微镜揭示了聚集和融合形成薄膜的纳米粒子的存在。在较高的温度和较长的反应时间下观察到纳米颗粒的定向附着和指示增强的结晶度的特征。这些数据为等级结构的持久性提供了直接证据（即，形成3D微粒和2D膜层的纳米颗粒）。这些发现为MSH的精确化学合成及其作为建筑粘合剂的广泛用途提供了见解。
The extent of utilization of magnesium silicate hydrate (MSH) in construction is limited partly because of insufficient data ascertaining the kinetics of its precipitation. Here, MSH grown homogeneously or heterogeneously in the range of magnesium to silicon solution molar concentration ratios, [Mg]/[Si] = 0.5–1.5, and temperature = 25–80 °C was analyzed for its chemical structure and morphology. Infrared spectroscopy and geochemical modeling show that increasing the [Mg]/[Si] ratio results in less silicate polymerization in MSH. Atomic force microscopy reveals the presence of nanoparticles that aggregate and fuse to form films. Oriented attachment of nanoparticles and features indicative of enhanced crystallinity were observed at higher temperatures and longer reaction times. These data provide direct evidence for the persistence of hierarchical structures (i.e., nanoparticles forming 3D microparticles and 2D film layers) at the nanoscale to mesoscale. These findings offer insights into the precise chemical synthesis of MSH and its widespread use as a binder for construction purposes.