Chemical Reactions On and With Surfaces

该项目属于分析和表面化学的一般领域，以及表面化学改性的子领域。这项研究工作的主要目的是详细调查化学反应，通过这些化学反应，可以用硅烷对二氧化硅表面进行化学修饰，以生产具有广泛科学、技术和工业重要性的产品和工艺。其中包括用于有效分离化学和生物技术制造中的产品的色谱固定相，以及用于经济和能源上有利的材料合成和加工的催化剂。研究战略将首先集中在表面改性过程中使用的烷氧基硅烷的溶液化学上。然后将用热化学和色谱技术研究这些烷氧基硅烷在二氧化硅上的物理吸附的热力学和动力学，以阐明这种“预反应相遇”在整个表面改性过程中的作用。然后将探索烷氧基硅烷与二氧化硅表面的反应在多大程度上可以被催化，无论是作为溶液/固体还是作为气体/固体反应体系。最后，这些研究的结果将被用来开发动态计算机模型，用它可以更全面地了解硅烷对二氧化硅表面的改性，并用它来预测期望的表面改性过程的最佳反应条件。

This project is in the general area of analytical and surface chemistry and in the subfield of chemical modification of surfaces. The primary thrust of this research effort is to investigate in detail the chemical reactions by which the surfaces of silica can be chemically tailored with silanes to produce products and processes of broad scientific, technological, and industrial importance. Among these are chromatographic stationary phases for the efficient separation of products in chemical and biotechnological manufacture, and catalysts for the economically and energetically favorable synthesis and processing of materials. The research strategy will focus first on the solution chemistry of the alkoxysilanes that are used in surface modification processes. The thermodynamics and kinetics of physisorption of these alkoxysilanes on silica will then be studied by thermochemical and chromatographic techniques to elucidate the role of such "pre-reaction encounters" in the overall sueface modification process. The extent to which the reactions of alkoxysilanes with silica surfaces can be catalyzed, either as solution/solid or as gas/solid reaction systems, will then be explored. Finally, the results of these studies will be utilized to develop dynamic computer models with which the silane modification of silica surfaces can be more fully understood and with which optimal reaction conditions for desired surface modification processes can be predicted.