Melting of Size Selected Clusters and Nanocrystals

选定尺寸的簇和纳米晶体的熔化

• 批准号: 0111373
• 负责人: Martin Jarrold
• 金额: $ 44.04万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-09-01 至 2002-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0111373&HistoricalAwards=false
• 关键词: Melting; Size; Selected; Clusters; Nanocrystals

In this project funded by the Physical Chemistry Program of the Chemistry Division, Martin Jarrold of Northwestern University will pursue a program of research to examine the changes in the melting of a material as it decreases in size from a macroscopic to a microscopic scale. The ion-mobility technique will be used to study the melting of metallic cluster ions in the gas phase. Using this method the volume or shape change of a cluster that occurs upon melting will be sensed. Information about the latent heat of fusion will be determined using collision-induced dissociation in an ion mobility cell. Measurements will be performed for a variety of metal and alkali-halide clusters. Very little experimental data is currently available about the change in the behavior of melting materials as the size of the bulk material shrinks to the nanometer regime. This research project will provide insight into the connection between bulk melting and analogous behavior in very small-size systems (fewer than 500 atoms) and should ultimately help explain how to prepare nanometer-sized particles. As such it has implications for turning the synthesis of nanoscale structures from an art into a science and will affect many aspects of nanotechnology.

在这个由化学系物理化学项目资助的项目中，西北大学的马丁·贾罗德（Martin Jarrold）将开展一项研究计划，以检查材料的熔化随着其尺寸从宏观尺度减小到微观尺度的变化。 离子淌度技术将用于研究金属簇离子在气相中的熔化。 使用这种方法，可以感测熔化时发生的团簇的体积或形状变化。 有关融合潜热的信息将通过离子淌度池中碰撞诱导解离来确定。 将对各种金属和碱卤化物簇进行测量。 目前，当大块材料的尺寸缩小到纳米范围时，有关熔化材料行为变化的实验数据非常少。 该研究项目将深入了解体积熔化与非常小尺寸系统（少于 500 个原子）中的类似行为之间的联系，并最终有助于解释如何制备纳米尺寸的颗粒。 因此，它对于将纳米级结构的合成从艺术转变为科学具有重要意义，并将影响纳米技术的许多方面。