Laser-based diagnostics for the in situ characterization of non-soot nanoparticles
基于激光的非烟灰纳米颗粒原位表征诊断
基本信息
- 批准号:222540104
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Research Grants
- 财政年份:2013
- 资助国家:德国
- 起止时间:2012-12-31 至 2020-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Methods that allow an in situ characterization of inorganic nanoparticles during gas-phase synthesis are only little explored - despite the importance to produce defined product qualities. This deficiency is not only due to the poorly known optical properties of such nanomaterials but also because experiments are missing enable direct comparison of optical in situ measurements and conventional (ex situ) particle characterization. The aim of this project is, based on laser-induced incandescence (LII) as a method established for soot diagnostics, to further develop diagnostics for particle size and volume fraction of the inorganic materials systems silicon (Si), germanium (Ge), iron (Fe), and copper (Cu). New insights obtained for Si within the project SCHU 1369/14-1 will be further deepened towards applicability and extended to the other material systems whose optical properties are so far incompletely known in the relevant temperature range. The nanoparticles are generated and optically analyzed in a microwave-plasma reactor at pressures between 30 and 900 mbar. First, the wavelength-dependent absorption function (E(m)) will be determined via line-of-sight absorption (LOSA) investigating the optical properties of the particles both in the absence and the presence of a heating laser pulse that is used for LII. Photodiodes or a combination of a spectrometer and a streak camera will serve as detection units. It is also planned to demonstrate the applicability of a phenomenon that has been discovered for Si in the first proposal period: Liquid-solid phase transitions can be observed via their absorption/emission spectra. This will also be further pursued for the other materials systems. In addition, fluence-dependent incandescence spectra and their temporal development (time-resolved LII) will be recorded for all materials systems and analyzed with respect to their emission properties in the context of particle-size determination. Fluence values will be increased into the range where full particle evaporation is achieved without gas breakdown. This allows to explore the origin of non-thermal emissions that can interfere with the LII signal (Bremsstrahlung, "anomalous cooling" during the LII-process). Particle-based atomic emissions will be investigated (intensity, emission lifetimes) during low-fluence LIBS (laser-induced breakdown) processes in the context of practical applicability. With the optical measurements, particle-size distributions will be determined using inline particle mass spectrometry (PMS) from within the same probe volume. In addition, by thermophoretic sampling and ex situ transmission electron microscopy (TEM) and Raman analysis, particle size and crystallinity will be investigated. All results taken together will strongly increase our knowledge in in particle optical properties and diagnostics and provide valuable input parameters for the underlying models that are required for quantitative analysis of LII and LIBS signals.
在气相合成过程中原位表征无机纳米粒子的方法很少探索-尽管生产定义的产品质量的重要性。这种缺陷不仅是由于这种纳米材料的光学性质知之甚少,而且还因为缺少实验,使得能够直接比较光学原位测量和常规(非原位)颗粒表征。该项目的目的是,基于激光诱导白炽(LII)作为烟尘诊断的方法,进一步开发无机材料系统硅(Si),锗(Ge),铁(Fe)和铜(Cu)的粒度和体积分数的诊断。在项目SCHU 1369/14-1中获得的硅的新见解将进一步深化适用性,并扩展到其他材料系统,其光学性质在相关温度范围内迄今为止还不完全已知。纳米粒子在微波等离子体反应器中在30和900毫巴之间的压力下产生和光学分析。首先,波长依赖性吸收函数(E(m))将通过视线吸收(LOSA)来确定,该视线吸收(LOSA)研究在不存在和存在用于LII的加热激光脉冲的情况下颗粒的光学性质。光电二极管或光谱仪和扫描相机的组合将用作检测单元。还计划证明在第一个提案期内发现的Si现象的适用性:可以通过其吸收/发射光谱观察到液-固相变。这也将进一步推动其他材料系统。此外,将记录所有材料系统的能量密度相关白炽光谱及其时间发展(时间分辨LII),并在粒度测定的背景下分析其发射特性。注量值将增加到实现完全颗粒蒸发而不发生气体分解的范围内。这允许探索可能干扰LII信号的非热发射的起源(韧致辐射,LII过程中的“异常冷却”)。基于粒子的原子发射(强度,发射寿命)将在低通量LIBS(激光诱导击穿)过程中的实际适用性的背景下进行调查。通过光学测量,将使用同一探针体积内的在线粒子质谱法(PMS)确定粒度分布。此外,通过热泳取样和非原位透射电子显微镜(TEM)和拉曼分析,粒度和结晶度将进行研究。所有结果加在一起将大大增加我们在粒子光学性质和诊断方面的知识,并为LII和LIBS信号定量分析所需的基础模型提供有价值的输入参数。
项目成果
期刊论文数量(5)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Interrogating Gas-Borne Nanoparticles Using Laser-Based Diagnostics and Bayesian Data Fusion
- DOI:10.1021/acs.jpcc.0c10026
- 发表时间:2021-04
- 期刊:
- 影响因子:3.7
- 作者:J. Menser;K. Daun;C. Schulz
- 通讯作者:J. Menser;K. Daun;C. Schulz
Evaluation of Drude parameters for liquid Germanium nanoparticles through aerosol-based line-of-sight attenuation measurements
- DOI:10.1016/j.jqsrt.2019.01.021
- 发表时间:2019-03
- 期刊:
- 影响因子:2.3
- 作者:K. Daun;J. Menser;M. Asif;Stanislav Musikhin;T. Dreier;C. Schulz
- 通讯作者:K. Daun;J. Menser;M. Asif;Stanislav Musikhin;T. Dreier;C. Schulz
Detector calibration and measurement issues in multi-color time-resolved laser-induced incandescence
多色时间分辨激光诱导白炽光中的探测器校准和测量问题
- DOI:10.1007/s00340-019-7235-7
- 发表时间:2019
- 期刊:
- 影响因子:0
- 作者:R. Mansmann;T.A. Sipkens;J. Menser;K.J. Daun;T. Dreier;C. Schulz
- 通讯作者:C. Schulz
Spatial distribution of gas-phase synthesized germanium nanoparticle volume-fraction and temperature using combined in situ line-of-sight emission and extinction spectroscopy.
- DOI:10.1364/oe.418922
- 发表时间:2021-03
- 期刊:
- 影响因子:3.8
- 作者:Guannan Liu;M. Asif;J. Menser;T. Dreier;K. Mohri;C. Schulz;T. Endres
- 通讯作者:Guannan Liu;M. Asif;J. Menser;T. Dreier;K. Mohri;C. Schulz;T. Endres
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Professor Dr. Christof Schulz其他文献
Professor Dr. Christof Schulz的其他文献
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{{ truncateString('Professor Dr. Christof Schulz', 18)}}的其他基金
Influence of hydrogen and oxygen on the initial steps of soot formation
氢和氧对烟灰形成初始阶段的影响
- 批准号:
275255277 - 财政年份:2015
- 资助金额:
-- - 项目类别:
Research Grants
Investigation of photophysical processes as the basis for quantitative imaging of gas-phase mixing processes with tracer LIF
研究光物理过程作为示踪 LIF 气相混合过程定量成像的基础
- 批准号:
281747438 - 财政年份:2015
- 资助金额:
-- - 项目类别:
Research Grants
Remote measurement of liquid water film thickness, temperature, and composition using near-infrared absorption
利用近红外吸收远程测量液态水膜厚度、温度和成分
- 批准号:
229633504 - 财政年份:2013
- 资助金额:
-- - 项目类别:
Research Grants
Investigation of the chemical kinetics of incomplete oxidation processes in shock tubes
激波管中不完全氧化过程的化学动力学研究
- 批准号:
239921643 - 财政年份:2013
- 资助金额:
-- - 项目类别:
Research Units
Minimal-invasive faserbasierte Sensoren für die Laser-induzierte Fluoreszenzdiagnostik
用于激光诱导荧光诊断的微创光纤传感器
- 批准号:
211969113 - 财政年份:2012
- 资助金额:
-- - 项目类别:
Research Grants
Combined particle- and time-of-flight mass spectrometry in flame-based nanoparticle synthesis
基于火焰的纳米颗粒合成中的组合颗粒和飞行时间质谱分析
- 批准号:
212588814 - 财政年份:2012
- 资助金额:
-- - 项目类别:
Research Grants
Measurements of engine gas temperature, velocities and early flame propagation
发动机气体温度、速度和早期火焰传播的测量
- 批准号:
129842743 - 财政年份:2009
- 资助金额:
-- - 项目类别:
Research Grants
Role of hydrogen in the formation of condensed carbon nanoparticles from gas-phase reactions
氢在气相反应形成凝聚碳纳米颗粒中的作用
- 批准号:
59615018 - 财政年份:2008
- 资助金额:
-- - 项目类别:
Research Grants
Untersuchungen der Kinetik von Schlüsselreaktionen der Chemilumineszenz in Stoßwellenrohrexperimenten
冲击波管实验中关键化学发光反应的动力学研究
- 批准号:
28156462 - 财政年份:2006
- 资助金额:
-- - 项目类别:
Research Grants
Prekusor-Zerfall und Partikelbildung: Kinetik, Synthese und Analyse
前体衰变和粒子形成:动力学、合成和分析
- 批准号:
23181110 - 财政年份:2006
- 资助金额:
-- - 项目类别:
Research Grants
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