Cluster Formation in Metastable Solutions

亚稳态溶液中的团簇形成

• 批准号: 9020233
• 负责人: Allan Myerson
• 金额: $ 12.15万
• 依托单位: Polytechnic University of New York
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-04-01 至 1993-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9020233&HistoricalAwards=false
• 关键词: Cluster; Formation; Metastable; Solutions

The project examines the formation of precritical molecular clusters in metastable supersaturated aqueous solutions of glycine, NaCl, KCl, and NH4Cl. These molecular clusters affect solution properties such as viscosity and diffusivity and plays an important role in nucleation and crystal growth. A Spherical Void Electrodynamic Levitator is used to obtain highly supersaturated droplets. The size distribution of clusters in these droplets is measured directly by quasielastic light scattering. The data are used to resolve certain important outstanding problem in nucleation theory, involving cluster size and evolution. The results of this interdisciplinary project, by one chemical engineer and one physicist, are important for better understanding and designing crystallization process for separation and purification of many industrial and pharmaceutical products.

该项目研究了在甘氨酸，NaCl，KCl和NH4CL的亚稳态过饱和水溶液中的过度分子簇的形成。 这些分子簇会影响溶液特性，例如粘度和扩散率，并在成核和晶体生长中起重要作用。 球形电动动力学悬浮剂用于获得高度过饱和的液滴。 这些液滴中簇的尺寸分布直接通过准灯光散射直接测量。 数据用于解决成核理论中的某些重要问题，涉及群集大小和进化。 该化学工程师和一位物理学家的这个跨学科项目的结果对于更好地理解和设计了许多工业和药品的分离和纯化的结晶过程很重要。