Synthesis of Composite Particles by Liquid Aerosol Thermolysis

液体气溶胶热解合成复合颗粒

• 批准号: 9202418
• 负责人: Gary Messing
• 金额: $ 31.35万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-09-01 至 1996-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9202418&HistoricalAwards=false
• 关键词: Synthesis; Composite; Particles; Liquid; Aerosol

Liquid aerosol thermolysis (LAT) refers to the general class of particle synthesis processes in which a liquid precursor solution is atomized into discrete droplets and subsequently transported through a time/temperature/atmosphere-regulated reactor. The overall objective of the proposed program is to establish a fundamental engineering science for the synthesis of submicron, composite particles by liquid aerosol thermolysis. Particle synthesis and solution experiments are designed to identify those factors affecting solid composite particle formation and chemical distribution. In situ technique will be used to monitor droplets generation and shrinkage during the evaporation stage as a function of atomization, precursor solution characteristics and evaporation conditions. After the evaporation stage, on-line sampling will be used to obtain and characterize particles as a function of time and temperature. Each process step will be mathematically analyzed using information generated in the above experiments and evaluated against existing or derived models for those processes. Model systems, based on alumina precursors as the matrix phase, have been selected examine first the synthesis of homogeneous composite systems in which the nanocrystalline phases are uniformly dispersed and second, those in which one phase encapsulates the other. Zinconia and platinum in alumina allow use to examine issues associated with uniform precipitation whereas alumina-SiC allows us the possibility to examine the isolation of one phase (SiC) within another (i.e. intragranular). The proposed techniques aim to production of nanocrystalline materials of a wide compositional range and having 100 nm crystallinity, of desired uniformity and second phase distribution.

液体气溶胶疗法（LAT）是指 其中液体前体 将溶液雾化成离散的液滴， 通过时间/温度/气氛调节的 反应器 拟议方案的总体目标是 建立一门基础工程科学， 由液体气溶胶制成的亚微米复合颗粒 治疗 粒子合成和溶液实验是 旨在确定那些影响固体复合材料的因素 颗粒形成和化学分布。 原位 技术将用于监测液滴产生， 蒸发阶段的收缩率， 雾化、前体溶液特性和 蒸发条件 在蒸发阶段之后，在线 取样将用于获得和表征颗粒， 是时间和温度的函数 每个过程步骤将 使用在数据库中生成的信息进行数学分析。 上述实验，并根据现有或衍生的 这些过程的模型。 基于氧化铝的模型系统 前驱体作为基体相， 第一，同质复合系统的合成， 纳米晶相均匀分散， 其中一个相包裹另一个相的那些。 Zinconia和 氧化铝中的铂允许用于检查相关问题 具有均匀的沉淀，而氧化铝-SiC允许我们 可以检查单相（SiC）的隔离 在另一个（即颗粒内）。 所提出的技术旨在生产纳米晶 具有宽组成范围且具有100 nm 结晶度，所需的均匀性和第二相 分布