CAREER: Electrohydrostatics, Electrohydrodynamics and Microstructural Evolution During Electrodispersion Precipitation

职业：电分散沉淀过程中的电流体静力学、电流体动力学和微观结构演化

• 批准号: 9700860
• 负责人: Sandra Greer
• 金额: $ 38.37万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-05-15 至 2002-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9700860&HistoricalAwards=false
• 关键词: CAREER; Electrohydrostatics; Electrohydrodynamics; Microstructural; Evolution

9700860 Harris The objective of this Faculty Early Career Development project is to study the fundamentals of electrohydrodynamics and mass transfer with chemical precipitation that occur in electro dispersion precipitation processes. This proposal addresses the physical, chemical and engineering issues that govern electro atomization in liquid-liquid systems and the formation of solid particles from microdroplets. The drawback to improving electrodispersion precipitation processes in liquid-liquid systems is the lack of a fundamental understanding about the electrohydrodynamics of the atomization process and the mass transfer with chemical precipitation that occurs in the dispersed phase. A tremendous amount of literature has been generated on the electroatomization of pendant and sessile drops in liquid-air systems. However, very little research has been done to understand the effect of static and pulsed electric fields on conducting pendant/sessile drops and liquid streams emanating from a nozzle and immersed in a low dielectric constant liquid. Specific questions include the effect of static and pulsed electric fields on pendant drops and the conditions under which shells form rather than microspheres. Additionally, this research project will be integrated into a series of graduate- and undergraduate-level courses that the PI is developing on the "Science and Engineering of Colloidal Systems." The courses will discuss the fundamentals of hydrosol and organosol synthesis, surface science and engineering, and the effect of electric fields on colloidal systems and surfaces. The PI also will spend at least two weeks per year during the summer conducting science and engineering camps to encourage junior high and high school minority students to pursue degrees in science and engineering. %%% This work will have a significant impact on increasing the throughput of all liquid-liquid electroatomization processes and on the production of microparticles with co ntrolled morphologies, size, and composition. Improvement of this technology will lower the cost of ceramic starting powders for high technology applications. ***

9700860 Harris 该教师早期职业发展项目的目标是研究电分散沉淀过程中发生的化学沉淀的电流体动力学和质量传递的基础知识。该提案解决了控制液-液系统中的电雾化以及微滴形成固体颗粒的物理、化学和工程问题。 改进液-液系统中电分散沉淀过程的缺点是缺乏对雾化过程的电流体动力学和分散相中发生的化学沉淀的传质的基本了解。 关于液-空气系统中悬滴和座滴的电雾化已经产生了大量文献。 然而，很少有研究来了解静态和脉冲电场对传导悬滴/座滴和从喷嘴发出并浸入低介电常数液体中的液流的影响。 具体问题包括静态和脉冲电场对悬滴的影响以及形成壳而不是微球的条件。 此外，该研究项目将被纳入 PI 正在开发的“胶体系统科学与工程”系列研究生和本科课程中。 这些课程将讨论水溶胶和有机溶胶合成、表面科学和工程的基础知识，以及电场对胶体系统和表面的影响。 PI还将在每年暑期至少花两周时间举办科学与工程夏令营，以鼓励初中和高中少数族裔学生攻读科学与工程学位。 %%% 这项工作将对提高所有液-液电雾化过程的吞吐量以及具有受控形态、尺寸和成分的微粒的生产产生重大影响。 这项技术的改进将降低高科技应用的陶瓷原料粉末的成本。 ***