Electrically-Assisted Flame Aerosol Synthesis of Nanoparticles

摘要CTS-9619392 S.E，Pratsinis U.来自辛辛那提 结合实验和建模调查的影响充电的陶瓷纳米粒子在火焰中的形成将进行。实验表明，在颗粒特性和火焰特性的特定范围内，颗粒尺寸可以控制在1 nm以内。 在与火焰气体交叉流动的颗粒形成区域中产生电场，并且通过使用电晕放电使所产生的颗粒带电以减少团聚。 将与凯斯西储大学（P.莫里森教授）合作进行现场傅里叶变换红外光谱学，以测量气体和颗粒的温度。 颗粒尺寸和结构沿着火焰轴的演变将与凯斯西储大学（C.M. Magaraban）。 将使用微分迁移率分析仪、扫描和透射电子显微镜、X射线衍射和比表面积分析进行颗粒和浓度表征。 一个模型，包括颗粒成核，表面生长，凝聚，烧结和充电在三维条件下将开发。家乡大学和俄亥俄州将为该项目提供总额为169,600美元的配套资金。 如果成功的话，这个项目将提供一个更好的基本了解火焰中的颗粒形成过程，为进一步的建模工作的数据库，并在总体上以高速率和相对较低的成本合成非团聚的纳米颗粒的方法。

Abstract CTS-9619392 S.E, Pratsinis U. of Cincinnati A combined experimental and modeling investigation of the effect of electrical charging on the formation of ceramic nanoparticles in flames will be undertaken. Experiments have shown that the particle size can be controlled within 1 nm in specific ranges of particle properties and flame characteristics. Electric fields are created in region of particle formation at crossflow with flame gases, and the resulted particles are charged by using a corona discharge to reduce agglomeration. In-situ Fourier Transform Infra Red spectroscopy will be performed to measure the temperature of gases and particles in collaboration with the Case Western Reserve University (Prof. P. Morrison). The evolution of the particle size and structure along the flame axis will be measured using rapid thermophoretic sampling in collaboration with the Case Western Reserve University (Prof. C.M. Magaridis). Particle and concentration characterization will be performed with a differential mobility analyzer, scanning and transmission electron microscopy, X-ray diffraction and specific surface area analysis. A model including particle nucleation, surface growth, coagulation, sintering and charging in three-dimensional conditions will be developed. The home university and the Ohio State will provide matching funds in total value of $169,600 for this project. If successful, this project ill provide a better fundamental understanding of particle formation processes in flames, a data base for further modeling efforts, and overall an approach to synthesise non-agglomerated nanoparticles at high rates and at a relatively low cost.