Supplemental Funding for Women Engineering Research Assist- ants: Aqueous Solution Precipitation of Inorganic Particu- lates with Uniform Distribution of Nonequilibrium Additives

女性工程研究助理补充资助：非平衡添加剂均匀分布的无机颗粒水溶液沉淀

• 批准号: 8502409
• 负责人: Joseph Estrin
• 金额: $ 11.23万
• 依托单位: University of Rhode Island
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1985
• 资助国家: 美国
• 起止时间: 1985-09-15 至 1988-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8502409&HistoricalAwards=false
• 关键词: Supplemental; Funding; Women; Engineering; Research

This project investigates the identification and characterization of the micro-sized crystalline products formed when inorganic components are rapidly precipitated from solution containing a specific additive component. These precipitations are derived in most instances by homogeneous nucleation and under conditions of large supersaturations, as two solutions are rapidly mixed in a flow-mixing device (Nielson rapid mixing method). To broaden application of the technique, a modification permits use of more soluble systems through secondary nucleation mechanisms. The product crystals are characterized to determine the extent of crystallinity and the uniformity of additive distribution by electron microscope and X-ray methods. The underlying model visualized and employed in devising the experiments is that continuous crystal growth occurs, i.e., the crystal surface is diffuse. The motivation for this work is to produce uniform solid mixtures suitable for several applications, such as raw materials for refractory materials, catalysts, and semiconductor systems. The work also provides insight into the basic mechanisms involved when rapid crystal growth from solution occurs.

本项目研究的是 当无机组分 从含有特定添加剂的溶液中快速沉淀 成分 在大多数情况下，这些沉淀物是由 均匀成核和在大的过饱和条件下， 当两种溶液在流动混合装置（Nielson）中快速混合时 快速混合法）。 为了扩大该技术的应用， 改性允许使用更可溶的系统，通过二次 成核机制 产物晶体的特征在于 测定添加剂的结晶度和均匀性 用电子显微镜和X射线衍射法测定了它们的分布。 底层 模型可视化和设计实验中使用的是， 发生连续的晶体生长，即，晶体表面是扩散的。 这项工作的动机是产生均匀的固体混合物 适用于多种应用，例如耐火材料的原料 材料、催化剂和半导体系统。 这项工作也 提供了深入了解的基本机制时，快速结晶 从溶液中生长。