Hydrothermal Stability in Mesostructured Silica/Surfactant Composites: The Role of Kinetic Barriers

化学系的这一启动补助金授予了 位于洛杉矶的加州支持萨拉教授的研究 托尔伯特 研究的主题是动力学因素的研究 控制有序二氧化硅/表面活性剂介观结构的稳定性 复合材料在水热条件下。 这些新材料包括 一种有组织的有机成分，它控制着长距离的周期性， 和提供稳定性和强度的无机骨架。 如果 有机成分被去除，有序的相变 可以在真实的时间内跟踪所产生的介孔材料， 控制结构的动力因素，以揭示它们之间的相互作用 在有机填充约束和刚性无机二氧化硅之间 框架. 实时X射线散射和固态NMR光谱 用于跟踪结构变化和二氧化硅框架 凝 该项目的实验结果将提供信息 可直接用于二氧化硅/表面活性剂的新合成 复合材料. 这项工作的最终目标是学习如何形成新的 用于特定应用的复合或中孔结构，例如 催化或化学传感器。

This starter grant award of the Chemistry Division to the University of California at Los Angeles supports the research of Professor Sarah Tolbert. The theme of the research is the study of kinetic factors controlling stability in ordered silica/surfactant mesostructured composites under hydrothermal conditions. These new materials consist of an organized organic component, which controls long-range periodicity, and an inorganic framework, which provides stability and strength. If the organic component is removed, phase transitions in the ordered mesoporous material produced can be followed in real time to gain insight into the kinetic factors controlling structure to reveal the interplay between organic packing constraints and the rigid inorganic silica framework. Real-time X-ray scattering and solid-state NMR spectroscopy are used to follow both structural change and silica framework condensation. The results of the experiments in this project will provide information that can be directly used in new syntheses of silica/surfactant composites. The ultimate goal of this work is to learn how to form new composite or mesoporous structures for specific applications, such as catalysis or chemical sensors.