MRI-R2: Acquisition of an X-ray Powder Diffractometer

该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。该奖项来自主要研究仪器（MRI）项目，乔治城大学化学系的Sarah L. Stoll教授及其同事将获得用于表征材料和纳米结构材料的粉末x射线衍射仪。该仪器将用于支持以下研究活动：1)用于磁性导体的镧系硫族化合物的研究；2)土壤样品粘土矿物分析；3)配位聚合物和框架材料；模板定向晶体生长；5)用于燃料电池的形状和尺寸可控的铂基双金属纳米颗粒；6)电荷转移纳米晶体；以及自组装的纤维网络。x射线衍射仪可以精确测量分子的完整三维结构，包括键距和角度，并提供有关分子相对于邻近分子的空间排列的准确信息。粉末衍射仪可用于粉末晶体材料的衍射研究。这些数据提供了有关粒度、相鉴别和纯度分析的信息。这里描述的研究将影响许多领域，包括化学和材料化学。该仪器将成为教学和研究的一个组成部分。

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).With this award from the Major Research Instrumentation (MRI) program Professor Sarah L. Stoll and colleagues from the Department of Chemistry at Georgetown University will acquire a powder X-ray diffractometer for the characterization of materials and nanostructured materials. The instrument will be used to support research activities such as: 1) study of lanthanide chalcogenides for use in magnetic conductors; 2) analysis of clay minerals in soil samples; 3) coordination polymers and framework materials; 4) template directed crystal growth; 5) shape and size controlled Pt based bimetallic nanoparticles for fuel cell applications; 6) charge transfer nanocrystals; and 7) self assembled fibrillar networks.An X-ray diffractometer allows accurate and precise measurements of the full three dimensional structure of a molecule, including bond distances and angles, and provides accurate information about the spatial arrangement of a molecule relative to neighboring molecules. A powder diffractometer allows diffraction studies in powdered crystalline materials. The data provide information on particle sizes, phase identification and purity analysis. The studies described here will impact a number of areas, including chemistry and materials chemistry. This instrument will be an integral part of teaching as well as research.