Localized Gas Phase Transport: Fundamental Research and Applications

局部气相传输：基础研究与应用

• 批准号: 314615063
• 负责人: Professor Dr. Heiko Jacobs, since 4/2021
• 金额: --
• 依托单位: Fachgebiet Nanotechnologie (NANO)
• 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 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/314615063?language=en
• 关键词: Localized; Gas; Phase; Transport; Fundamental

This interdisciplinary proposal is at the cross-section of Aerosol science and the collection and detection of Airborne particles. The proposal describes the investigation of a new transport mechanism that we discovered, which supports the localized collection of airborne particles at a higher rate than previously possible. Strongly simplified the process is a directed electrodynamic transport process. The mechanism, as far as it is understood, is based on the interplay between high mobility gas ions with airborne particles, a patterned substrate, and a carrier gas. The process leads to localized collection and concentration of airborne particles at predetermined sensing points on a patterned substrate. The discovered process is applicable to a wide range of particle sizes (15 orders of magnitude so far in terms of particle weight, 102 Da to 3x1017Da) and types (organic and inorganic). In a first publication in Nature communications [1] we demonstrate that the collection process is several orders of magnitudes faster than the commonly used diffusion only transport. Despite the fact that the process is only poorly understood several immediate applications followed. For example in a publication [2] entitled >Localized Collection of Airborne Analytes: A Transport Driven Approach to Improve the Response Time of Existing Gas Sensor Designs< the increased deposition rate was applied to detect airborne molecules. In the subsequent publication [3] entitled >Active Matrix Based Collection of Airborne Analytes: An Analyte Recording Chip Providing Exposure History and Finger Print< the idea of an analyte recording chip is discussed. In a fourth [4] and very different application the discovered process was use to collect metallic nanoparticles to grow freestanding point to point nanowire bridges at high rates. The specific project targets the fundamental study of the underlying process and applications. For example, from a theoretical transport equation point of view the observed abnormally high collection rate cannot be explained unless the reaction kinetics (sticking coefficient) is different. The proposed process utilizes the interplay between charged ions, airborne particles, a pattered substrate with programmable charge dissipating contact points, and a carrier gas. The installation of an experimental platform is proposed to gain access to the relevant process parameter (gas ion concentration, particle number concentration, localized gas flow, ionic dissipation current, and potential profile). From an application point of view we would like to focus on the recently published idea [3] which describes a generic approach to collect airborne analytes in an active matrix type fashion on chip sized substrates. Finally, we would like to extend the range of analyte particles to include Airborne pathogens within the field of aerovirobiology. In preparation for the proposal we have conducted first experiments with airborne Bacteriophages.

这个跨学科的建议是在气溶胶科学的横截面和空气中颗粒的收集和检测。该提案描述了我们发现的一种新的传输机制的调查，该机制支持以比以前更高的速率局部收集空气中的颗粒。该过程被强烈简化为一个定向电动迁移过程。据了解，该机制是基于高迁移率气体离子与空气中的颗粒、图案化衬底和载气之间的相互作用。该过程导致在图案化衬底上的预定感测点处的空气传播颗粒的局部收集和集中。所发现的过程适用于广泛的颗粒尺寸（迄今为止在颗粒重量方面有15个数量级，102 Da至3x1017 Da）和类型（有机和无机）。在Nature Communications的第一篇文章中，我们证明了收集过程比通常使用的仅扩散传输快几个数量级。尽管人们对这一过程知之甚少，但随后立即提出了几项应用。例如，在标题为《Localized Collection of Airborne Analytes：A Transport Driven Approach to Improve the Response Time of Existing Gas Sensor Designs》的出版物[2]中，增加的沉积速率被应用于检测空气中的分子。在随后的出版物[3]中，题为《基于有源矩阵的空气传播分析物收集：提供暴露历史和指纹的分析物记录芯片》（Active Matrix Based Collection of Airborne Analytes：An Analyte Recording Chip Providing Exposure History and FingerPrint），讨论了分析物记录芯片的思想。在第四个[4]和非常不同的应用中，所发现的过程用于收集金属纳米颗粒，以高速生长独立的点对点纳米线桥。具体项目的目标是基础过程和应用的基础研究。例如，从理论传输方程的角度来看，观察到的异常高的收集率无法解释，除非反应动力学（粘附系数）是不同的。所提出的工艺利用带电离子、空气中的颗粒、具有可编程电荷耗散接触点的图案化衬底和载气之间的相互作用。建议安装一个实验平台，以获得相关的工艺参数（气体离子浓度，颗粒数浓度，局部气体流量，离子耗散电流和电位分布）。从应用的角度来看，我们想集中在最近发表的想法[3]，它描述了一种通用的方法来收集空气中的分析物在芯片大小的基板上的有源矩阵类型的方式。最后，我们希望扩大分析物颗粒的范围，以包括空气病毒生物学领域内的空气传播病原体。为了准备这项提案，我们已经用空气中的噬菌体进行了第一次实验。