Technician support for geoscience research in transmission electron microscopy

透射电子显微镜地球科学研究的技术人员支持

• 批准号: 0418960
• 负责人: Peter Buseck
• 金额: $ 15万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-10-01 至 2006-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0418960&HistoricalAwards=false
• 关键词: Technician; support; geoscience; research; transmission

EAR-0418960BuseckThis Phase II proposal is to support a full-time specialist in electron microscopy to help us take maximum geological, mineralogical, and geochemical advantage of two new state-of-the-art TEMs that were recently installed at Arizona State University. They will allow coupled elemental, crystal-chemical, and structural information to be obtained at the nanoscale. Biosphere-geosphere interactions either influence or lie at the heart of many fundamental questions confronting modern society. These include the origins of life, the habitability of planets, environmental degradation and remediation, climate change, and the geochemical cycling of elements. Carbon is, of course, central to biogeochemistry, and knowledge of the structure and physical-chemical properties of organic C-bearing materials in nature is basic for a mechanistic understanding of biogeochemical processes and other terrestrial and extraterrestrial interactions of C at low to moderate temperatures. These properties are both complex and heterogeneous at extremely short length scales. Characterization of C-bearing materials in terms of external form and internal structure, compositional variability, and bonding properties is not only well-suited to, but in many cases demands, study by TEM and associated spectroscopic techniques able to probe at the nanometer spatial scale. The major focus during Phase II will be on the characterization of carbonaceous materials in three areas of importance to biogeochemistry and C-cycle research: organic matter and other forms of C associated with clays in sedimentary rocks, carbonaceous atmospheric particles, and C in the fine grained matrices of primitive meteorites. In addition, we propose to develop TEM-based techniques for semi-quantitative analysis of H in organic materials on the nanometer scale. A wide range of ongoing projects on high-resolution microscopy of minerals, natural and generated aerosol particles, and controlled environmental TEM studies will also be facilitated through the availability of the senior technician to be provided via the requested grant.***

Buseck-0418960第二阶段的建议是支持电子显微镜的全职专家，以帮助我们最大限度地利用最近安装在亚利桑那州州立大学的两个新的最先进的TEM的地质学，矿物学和地球化学优势。 他们将允许耦合元素，晶体化学和结构信息，以获得在纳米级。 生物圈-地圈的相互作用影响着现代社会面临的许多基本问题，或者是这些问题的核心。其中包括生命的起源，行星的可居住性，环境退化和补救，气候变化和元素的地球化学循环。当然，碳是地球化学的核心，自然界中有机含碳物质的结构和物理化学性质的知识是机械理解地球化学过程和其他地球和地球外的C在低至中等温度下相互作用的基础。这些性质在极短的长度尺度上是复杂和异质的。含碳材料的外部形式和内部结构，成分的变化性，和键合性能方面的表征不仅非常适合，但在许多情况下要求，通过TEM和相关的光谱技术，能够探测在纳米空间尺度的研究。 第二阶段的主要重点将是碳质材料在地球化学和碳循环研究的三个重要领域的特征：有机物和其他形式的C与沉积岩中的粘土，碳质大气颗粒，和原始陨石的细粒基质中的C。此外，我们建议开发基于TEM的技术，半定量分析的H在有机材料的纳米尺度。还将通过所要求的赠款提供高级技术员，为正在进行的矿物、天然和生成的气溶胶颗粒高分辨率显微镜检查以及受控环境TEM研究等一系列项目提供便利。