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Electrowetting Effects and Nanoscale Transport

电润湿效应和纳米级传输

基本信息

批准号：
2303574
负责人：
Paul Bohn
金额：
$ 48万
依托单位：
University of Notre Dame
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2023
资助国家：
美国
起止时间：
2023-07-01 至 2026-06-30
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2303574&HistoricalAwards=false
关键词：
Electrowetting Effects Nanoscale Transport

项目摘要

With support from the Chemical Measurement and Imaging Program in the Division of Chemistry, Professor Paul Bohn and his group at the University of Notre Dame are studying the design, behavior, and possible applications of new artificial materials inspired by Nature, particularly architectures consisting of layered films where each layer has a different pore structure. The work is motivated by applications ranging from molecular separations to catalysis. For example, these materials can selectively remove unwanted components in applications such as beverage clarification, clearance of pathogens from blood, and in controlled release of drugs and highly selective sensors for disease-specific biomarkers. These experiments will establish the know-how to control the wetting characteristics of the liquid on the wall, thereby making it possible to use advanced fluid control concepts in technological applications, such as separations in complex fluids. The work is also coupled with the development of new multi-university programs that cut across disciplinary lines and address specific NSF goals, including the development of a diverse, globally competitive STEM (science, technology, engineering and mathematics) workforce, increased partnerships between academia and industry, and increased economic competitiveness.The project addresses transport in nanoscale confined volumes, which highlights a core set of scientific phenomena - wetting/dewetting, hydrophobicity, stochastic fluctuations in fluid flow, electrokinetics, etc. - that exhibit fundamentally distinct behavior on the nanoscale. The research is organized around two overarching objectives: developing single molecule-based electrokinetic and spectro-electrochemical probes of transport in one-dimensional (1D) nanostructures; and applying these tools to explore the interaction between electrically-modulated wetting phenomena and nanoconfined flows. The first objective will be addressed by fabricating structures to access transport in the ultralow Peclét number regime; developing correlative and frequency-domain measurements to characterize fluid transport and fluid-wall interactions; and implementing these measurement strategies to study electrokinetic flows in confined 1D nanocylinder and nanochannel flow formats. The second objective will be pursued by developing nanoconfined architectures that support electrowetting phenomena; and applying electrowetting principles to control nanoconfined flow in both model systems and in hierarchically-organized, multi-lamellar structures with depth-varying porosity. These experiments will establish the conditions necessary to control the wetting characteristics of the solvent-wall system. Studies will be implemented in a well-defined water-organic solvent interface that can support quantitative electrochemical and spectroscopic experiments capable of reporting on the state of the aqueous-organic interfaces as a function of applied potential. These studies are directed at establishing the design rules, structural motifs, and operating principles needed to achieve a high level of control over molecular transport in nano-confined volumes.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

在化学系化学测量和成像项目的支持下，圣母大学的Paul Bohn教授和他的团队正在研究受大自然启发的新型人工材料的设计、行为和可能的应用，特别是由层状薄膜组成的结构，每层都有不同的孔隙结构。这项工作的动机是应用范围从分子分离到催化。例如，这些材料可以选择性地去除饮料澄清、清除血液中的病原体、控制药物释放和疾病特异性生物标志物的高选择性传感器等应用中不需要的成分。这些实验将建立技术诀窍来控制液体在壁上的润湿特性，从而使在技术应用中使用先进的流体控制概念成为可能，例如复杂流体的分离。这项工作还与新的多大学项目的发展相结合，这些项目跨越了学科界限，并解决了国家科学基金会的具体目标，包括发展多样化的、具有全球竞争力的STEM（科学、技术、工程和数学）劳动力，增加学术界和工业界之间的合作伙伴关系，以及提高经济竞争力。该项目研究的是纳米尺度受限体积内的传输，它强调了一系列核心的科学现象——润湿/脱湿、疏水性、流体流动的随机波动、动力学等——这些现象在纳米尺度上表现出截然不同的行为。该研究围绕两个总体目标组织：在一维（1D）纳米结构中开发基于单分子的电动和光谱电化学输运探针；并应用这些工具来探索电调制润湿现象与纳米约束流之间的相互作用。第一个目标将通过制造以超低peclsamt数制度进入运输的结构来解决；发展相关和频域测量来表征流体输运和流体-壁相互作用；并实施这些测量策略来研究受限一维纳米圆柱体和纳米通道流形式下的电动流动。第二个目标将通过开发支持电润湿现象的纳米结构来实现；并应用电润湿原理来控制模型系统和孔隙度随深度变化的分层组织、多层结构中的纳米约束流动。这些实验将建立必要的条件来控制溶剂-壁系统的润湿特性。研究将在一个定义良好的水-有机溶剂界面中实施，该界面可以支持定量电化学和光谱实验，能够报告水-有机界面的状态作为应用电位的函数。这些研究旨在建立设计规则、结构基序和操作原则，以实现对纳米受限体积内分子运输的高水平控制。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。