The Molecular Nature and Dynamics of Solid-Liquid Interface Sorptive Systems

这个项目是在一般地区的分析和表面 化学和分离科学的子领域。 推力 这个实验项目的目的是测量 在液体-固体界面的吸附-解吸，以评估 这种动力学在行为和表现中的作用 液相色谱分离介质及相关化学品 系统. 通过弛豫测量这些动态过程 动力学技术将提供有关 吸附和分离的机制，粘度的 界面域，和定量测量的程度， 表面的不均匀性， 吸附作用 化学改性二氧化硅和相关模型系统 将被合成用于这些研究。 这些材料 将通过傅里叶变换红外光谱 光谱法，固态核磁共振 光谱分析和元素分析。 溶剂的作用 确定界面极性和粘度将是 使用荧光探针技术测定。 结果进行 研究将与这些性能相关， 化学改性硅胶液相色谱固定液 阶段。 这项研究有望提高对 分离过程的化学性质和 固-液界面吸附体系。 这项工作将导致 涉及改进的色谱系统的开发， 分析和制备规模的应用， 影响科学和技术。

This project is in the general area of analytical and surface chemistry and in the subfield of separation science. The thrust of this experimental program is to measure the dynamics of sorption-desorption at liquid-solid interfaces in order to assess the role of such dynamics in the behavior and performance of liquid chromatographic separation media and related chemical systems. Measurement of these dynamic processes by relaxation kinetic techniques will provide information concerning the mechanisms of sorption and separation, the viscosity of the interfacial domain, and a quantitative measure of the degree of heterogeneity of surfaces with respect to the energetics of sorption. Chemically modified silicas and related model systems will be synthesized for use in these studies. These materials will be fully characterized by Fourier transform infrared spectrometry, solid state nuclear magnetic resonance spectrometry, and elemental analysis. The role of the solvent in determining the interfacial polarity and viscosity will be determined using fluorescence probe techniques. Results of these studies will be correlated with the performance of these chemically modified silicas as liquid chromatographic stationary phases. This research is expected to yield an improved understanding of the chemistry of separation processes and the general nature of solid-liquid interfacial sorptive systems. This work should lead to the development of improved chromatographic systems for both analytical and preparative scale applications that have broad impact in science and technology.