Investigation of transient transport processes using single gold nanopores as modelsystems

使用单个金纳米孔作为模型系统研究瞬态传输过程

• 批准号: 530069686
• 负责人: Dr. Maria Eugenia Toimil-Molares
• 金额: --
• 依托单位: GSI Helmholtzzentrum für Schwerionenforschung GmbH
• 依托单位国家: 德国
• 项目类别: Research Units
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/530069686?language=en
• 关键词: Investigation; transient; transport; processes; using

In the project single polymer track-etched nanochannels with tailored geometry, diameter, length, and surface charge will be fabricated and applied as model systems to systematically study how transient transport processes are influenced by each of these parameters. Asymmetric charged polymer nanochannels exhibit several remarkable properties, such as e.g., ion current rectification, ion selectivity, and ion current gating via external triggers such as pH value, temperature, light, or ion concentration. Among these, applying an external voltage to a well-defined conductive “gate” enables the local modification of the critical lengths (Debye layer thickness and Dukhin length), and constitutes the most suitable and promising solution for technological applications. In this project, polymer single nanochannels will be modified with conductive gold layers and porous gold to enable "voltage charging" of the gold surface. This will allow us to investigate how ion and mass transport are influenced by the external modulation of the Debye layer thickness and Dukhin length. In particular, the planned experiments will enable us to apply time-dependent voltage signals using different nanochannel configurations (e.g., Au-coated nanochannels and porous Au inside the nanochannel), varying the experimental parameters systematically (channel geometry and size, electrolyte composition and concentration, amplitude, and frequency of the voltage signal). The choice of the electrolyte will be based on the presence of ions with different charges and/or diffusivities. These experiments are particularly relevant for the realization of the theoretically predicted transient nanopores and future applications in more efficient membrane separation processes. Thus, in phase 1, the project will focus on studying and understanding the time-dependent transport properties using single Au-based nanochannels. In phase 2, this know-how will be applied to multi-channel membranes and specific separation processes.

在该项目中，将制作具有定制几何形状，直径，长度和表面电荷的单一聚合物径迹蚀刻纳米通道，并将其用作模型系统，以系统地研究瞬态传输过程如何受到这些参数的影响。不对称带电聚合物纳米通道表现出几种显着的性质，例如，离子电流整流、离子选择性和经由外部触发器（例如pH值、温度、光或离子浓度）的离子电流门控。其中，施加外部电压到一个明确定义的导电“门”，使局部修改的临界长度（德拜层厚度和Dukhin长度），并构成最合适的和有前途的解决方案的技术应用。在该项目中，聚合物单纳米通道将被导电金层和多孔金修饰，以使金表面能够“充电”。这将使我们能够研究如何离子和质量输运的影响德拜层厚度和杜欣长度的外部调制。特别是，计划中的实验将使我们能够使用不同的纳米通道配置（例如，Au涂覆的纳米通道和纳米通道内的多孔Au），系统地改变实验参数（通道几何形状和尺寸、电解质组成和浓度、电压信号的振幅和频率）。电解质的选择将基于具有不同电荷和/或扩散率的离子的存在。这些实验对于实现理论上预测的瞬时纳米孔和未来在更有效的膜分离过程中的应用特别相关。因此，在第一阶段，该项目将重点研究和理解使用单个Au基纳米通道的时间依赖性传输特性。在第二阶段，这些技术将应用于多通道膜和特定的分离过程。