Acquisition of Optical Second Harmonic Generation Instrumentation for the Study of Molecular Adsorption at the Mineral/Water Interface

采集光学二次谐波发生仪器用于研究矿物/水界面的分子吸附

• 批准号: 9725993
• 负责人: Carrick Eggleston
• 金额: $ 4.06万
• 依托单位: University of Wyoming
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-03-01 至 2000-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9725993&HistoricalAwards=false
• 关键词: Acquisition; Optical; Second; Harmonic; Generation

9725993 Eggleston This grant provides partial support of the costs of acquiring components to develop optical second harmonic generation (SHG) instrumentation to study molecular structure of adsorbed organic molecules on mineral surfaces. Coupled with the existing scanning probe microscope (EAR-9634143) at the University of Wyoming, this technique could yield unprecedented information on the orientation of adsorbed organics on mineral surfaces with single-crystal face specificity. SHG promises significant advantages over other analytical techniques for the analysis of molecular structure at mineral-fluid interfaces (i.e. X-ray absorption spectroscopy and Fourier transform infrared spectroscopy), the most important being that is useable in situ, at atmospheric pressure, and on non-powdered samples. Knowledge of the atomic-scale structure of fluid-rock geochemical interactions is fundamental to studies of mineral dissolution/growth and the fate of environmental pollutants. Therefore, analytical advances in mineral surface chemistry are at the frontier of our understanding of problems of pressing environmental significance. To that end, development of SHG should advance our knowledge of the pH dependency of surface electric fields, molecular adsorption and orientation, and fundamental electron transfer properties of redox centers at mineral surfaces. ***

小行星9725993埃格莱斯顿 这笔拨款提供部分资助，用以购置元件，以发展光学二次谐波产生仪器，研究矿物表面吸附有机分子的分子结构。 结合怀俄明州大学现有的扫描探针显微镜（SEM-9634143），这项技术可以产生前所未有的信息吸附在矿物表面的有机物的取向与单晶面特异性。与其他分析技术相比，SHG在矿物-流体界面的分子结构分析（即X射线吸收光谱和傅里叶变换红外光谱）方面具有显着的优势，最重要的是可在原位，在大气压下和非粉末样品上使用。 流体-岩石地球化学相互作用的原子尺度结构的知识是矿物溶解/生长和环境污染物命运研究的基础。 因此，矿物表面化学的分析进展处于我们对紧迫的环境意义问题的理解的前沿。 为此，SHG的发展应该推进我们的知识的pH依赖性的表面电场，分子吸附和取向，和基本的电子转移性质的氧化还原中心在矿物表面。 ***