Acquisition of a Particle Size Analyzer for Geochemical Research at Dartmouth College

达特茅斯学院购买用于地球化学研究的粒度分析仪

• 批准号: 9727362
• 负责人: Xiahong Feng
• 金额: $ 2.97万
• 依托单位: Dartmouth College
• 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=9727362&HistoricalAwards=false
• 关键词: Acquisition; Particle; Size; Analyzer; Geochemical

9727362 Feng This grant provides partial support of the acquisition costs of an X-ray attenuation-based particle size analyzer for the geology Department at Dartmouth College. This device measures continuous particle size distribution in samples by measuring the time varying attenuation of X-rays passing through samples as particles fall under the force of gravity through a liquid medium. The basic principle of the measurement relies on Stokes' Law of particle settling; larger particles settle more rapidly (neglecting particle shape and density variations) than smaller particles. The particle size analyzer will be used for a variety of funded research projects both for grain size analysis and as an alternative mineral separation technique. Studies of size- dependent isotopic exchange between zeolite minerals and surrounding fluids, size-dependent/surface area dependent silicate mineral weathering rates and provenance studies of marine sediments will take advantage of the instruments ability to rapidly measure continuous grain size distributions over a wide range of silt and clay sized particles (100 microns-10 nm). Several researchers at Dartmouth will make use of this equipment and will involve undergraduate students in the analytical phases of their respective research programs. ***

这笔拨款为达特茅斯学院地质系购置一台基于x射线衰减的粒度分析仪提供部分费用支持。该装置通过测量粒子在重力作用下通过液体介质时穿过样品的x射线随时间变化的衰减来测量样品中的连续粒度分布。测量的基本原理依赖于颗粒沉降的斯托克斯定律；较大的颗粒比较小的颗粒沉降更快（忽略颗粒形状和密度的变化）。粒度分析仪将用于各种资助的研究项目，既可用于粒度分析，也可作为一种替代矿物分离技术。沸石矿物与周围流体之间大小相关的同位素交换研究、大小相关/表面积相关的硅酸盐矿物风化速率和海洋沉积物的物源研究将利用该仪器在大范围淤泥和粘土大小颗粒（100微米-10纳米）上快速测量连续粒度分布的能力。达特茅斯的几位研究人员将使用该设备，并将让本科生参与各自研究项目的分析阶段。* * *