Fast reaction chemistry of plasmas in liquids interacting with surfaces

液体中等离子体与表面相互作用的快速反应化学

• 批准号: 316898868
• 负责人: Professor Dr. Achim von Keudell
• 金额: --
• 依托单位: Institut für Experimentalphysik II: Arbeitsgruppe reaktiver Plasmen
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/316898868?language=en
• 关键词: Fast; reaction; chemistry; plasmas; liquids

Plasmas in direct contact with liquids or plasmas inside liquids allow a high mass transfer of reactive species from the gas phase into the liquid. If these plasmas-in-liquids are interfaced with solids, very fast and efficient reaction rates for surface reactions can be realized. Such systems are relevant for the field of plasma medicine where the plasma interacts with a biological surface inside a liquid, the degradation of toxic organic compounds and plasma enhanced anodization of metal surfaces inside an electrolyte. Dominant reactive species in the liquid at the plasma-liquid-solid interface can be analyzed by gas chromatography, titration or electron spin resonance. However, these methods are either ex-situ or they are only sensitive to long living species. Prominent example is the current debate about plasma-activated media in the field of plasma medicine. However, in many of the above systems, the plasmas are at first directly interacting at the plasma-liquid-solid interface and a more direct insight into the reaction chemistry is desired. In this project, a special setup based on FTIR spectroscopy in the attenuated reflection mode is developed to probe the plasma-liquid-solid interface with high temporal resolution in the microsecond range based on Step-scan FTIR. Two prominent model cases are addressed, the plasma enhanced oxidation of metallic surfaces and the plasma induced modifications or organic and biological surfaces being a model system for the field of plasma medicine.

等离子体与液体或液体内部的等离子体直接接触，可以实现活性物质从气相到液体的高质量转移。如果这些液体等离子体与固体接触，则可以实现非常快速且有效的表面反应反应速率。此类系统与等离子体医学领域相关，其中等离子体与液体内的生物表面相互作用、有毒有机化合物的降解以及电解质内金属表面的等离子体增强阳极氧化。等离子体-液体-固体界面处液体中的主要活性物质可以通过气相色谱、滴定或电子自旋共振进行分析。然而，这些方法要么是异地的，要么仅对长寿物种敏感。突出的例子是当前血浆医学领域关于血浆激活介质的争论。然而，在许多上述系统中，等离子体首先在等离子体-液体-固体界面处直接相互作用，并且需要更直接地了解反应化学。在该项目中，开发了一种基于衰减反射模式 FTIR 光谱的特殊装置，用于基于步进扫描 FTIR 在微秒范围内以高时间分辨率探测等离子体-液体-固体界面。讨论了两个突出的模型案例，金属表面的等离子体增强氧化和等离子体诱导的改性或有机和生物表面作为等离子体医学领域的模型系统。