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. ***

9727362冯这笔赠款为达特茅斯学院地质学系购买基于X射线衰减的粒度分析仪提供了部分支持。该装置通过测量当颗粒在重力作用下通过液体介质时通过样品的X射线的时变衰减来测量样品中连续的颗粒尺寸分布。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更快地沉降(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，既用于粒度分析，也作为一种替代矿物分离技术。沸石矿物与周围流体之间依赖于尺寸的同位素交换、依赖于尺寸/表面积的硅酸盐矿物风化速率的研究以及海洋沉积物的来源研究将利用该仪器的能力，在广泛的粉砂和粘土颗粒(100微米-10纳米)上快速测量连续的粒度分布。达特茅斯大学的几名研究人员将利用这种设备，并让本科生参与各自研究项目的分析阶段。***