POWRE: Thermophoresis of Exothermically Reacting Particles in Aerosol Flow Reactors

在该领域专家的支持下，PI将获得一个新的研究领域的专业知识，即纳米相和亚微米颗粒合成。拟议的研究中心围绕生产用于先进电子和结构应用的高质量陶瓷粉末的需求。复合粉末必须由均匀、高密度的亚微米颗粒组成。气溶胶流动反应器为生产高质量粉末提供了一种有前途的技术，因为这些工艺既低成本又环保。在燃烧硝化合成氮化铝的过程中，研究了将热泳移出反应器壁的新方法。提出的工作的总体目标是建立一个模型，描述颗粒的生产和生长在气溶胶流动反应器的特点是高度放热反应。除了热泳外，该模型还将纳入凝聚和聚结的影响，因此将能够预测最终的颗粒大小和形态。虽然所提出的工作重点是在气溶胶流动反应器中直接硝化铝，但对热电泳的基本理解及其在粒子动力学模型中的结合将提供必要的框架，将这项工作扩展到各种精细氮化物的合成（例如，HfN, Mo2N, TaN， TiN和ZrN），以及使用类似放热处理生产的其他粉末。该奖项是对power征求的回应。

CTS-9973591Christine HrenyaUniversity of ColoradoThe PI will gain expertise in a new research area, namely nanophase and submicron particle synthesis, with the support of experts in the field. The proposed research centers around the need to produce high quality ceramic powders for advanced electronic and structural applications. Composite powders must be composed of uniform, high-density, submicron particles. Aerosol flow reactors provide a promising technology for producing high-quality powders since these processes are both low-cost and environmentally friendly. Novel methods will be investigated to re-direct thermophoresis away from the reactor wall during the combustion nitradation synthesis of aluminum nitride. The overall goal of the proposed work is to develop a model that describes particle production and growth in aerosol flow reactors characterized by highly exothermic reactions. In addition to thermophoresis, the model will incorporate the effects of coagulation and coalescence, and thus will be capable of predicting final particle size and morphology. Although the focus of the proposed work is on the direct nitradation of aluminum in aerosol flow reactors, the fundamental understanding of thermophoresis and its incorporation in a particle dynamics model will provide the framework necessary to extend this work to the synthesis of various fine nitride (e.g., HfN, Mo2N, TaN, TiN, and ZrN), as well as other powders produced using similar exothermic processing.This award is made in response to the POWRE solicitation.