CAREER: Non-agglomerated Nanoparticle Synthesis in Low Pressure Flames

职业：低压火焰中非团聚纳米粒子合成

基本信息

批准号：
9703357
负责人：
Nick Glumac
金额：
$ 20.91万
依托单位：
Rutgers University New Brunswick
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1997
资助国家：
美国
起止时间：
1997-05-01 至 2000-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9703357&HistoricalAwards=false
关键词：
CAREER Non agglomerated Nanoparticle Synthesis

项目摘要

ABSTRACT CTS-9703357 This is an investigation of non-agglomerated nanoparticle productiol in low-pressure flat flames. Production in low-pressure flames of a target group of materials including yttrium-stabilized zirconia, silicon oxynitride, alumina, zirconia, titania, and tungsten oxide, is demonstrated. Parametric studies assess the effects of process conditions on the size, quantity, and morphology of the synthesized nanopowders. Modeling and diagnostic work centers on a single nanopowder species with the goal of predicting particle sized, production rate, and degree of agglomeration given system process inputs. A gas-phase chemical mechanism is included in the model along with mechanisms for particles formation and growth. Multispecies laser-induced fluorescence is applied to the flames to quantify the gas-phase chemical environment, while laser absorption scattering measurements are probe sampling are used to quantify the particle size- and number-density fields. Several baseline production conditions are characterized and modeled and the model is refined to match the experimental observations, Analogous models are then produced for different powder species. This work demonstrates a technique for high-rate, inherently scalable production of a series of industrially significant non-agglomerated nanopowders. Process models for nanopowder production and developed. Such models extend present understanding of gas-phase particle synthesis and allow computational optimization mf the synthesis process. For scale-up operations, the models help in identifying appropriate process diagnostics for industrial reactors and enable development of closed-loop control algorithms.

摘要 CTS-9703357 这是对低压平焰中非团聚纳米颗粒生产的研究。演示了在低压火焰中生产目标材料组，包括钇稳定氧化锆、氮氧化硅、氧化铝、氧化锆、二氧化钛和氧化钨。参数研究评估工艺条件对合成纳米粉末的尺寸、数量和形态的影响。建模和诊断工作以单一纳米粉末种类为中心，目标是在给定系统过程输入的情况下预测颗粒大小、生产率和团聚程度。模型中包含气相化学机制以及颗粒形成和生长的机制。将多物种激光诱导荧光应用于火焰以量化气相化学环境，而激光吸收散射测量和探针采样则用于量化颗粒尺寸和数量密度场。对几种基线生产条件进行了表征和建模，并对模型进行了改进以匹配实验观察结果，然后为不同的粉末种类生成了类似的模型。这项工作展示了一种高速、本质上可扩展生产一系列具有工业意义的非团聚纳米粉末的技术。纳米粉末生产和开发的工艺模型。这些模型扩展了目前对气相颗粒合成的理解，并允许合成过程的计算优化。对于放大操作，这些模型有助于识别工业反应器的适当过程诊断，并能够开发闭环控制算法。