NER: High Throughput Manufacturing of Nanoporous Films via Flow-Induced Micelle Alignment

ABSTRACTPROPOSAL没有。研究项目：基于流动诱导胶束排列的纳米多孔膜的高通量制备研究，已获国家科学基金（NSF） 03-043纳米科学与工程计划（NER）资助。自组装流体（如虫状胶束）的流变光学表征和理论建模的最新进展为开发高通量和良好控制的纳米结构薄膜合成工艺设计提供了独特的机会。然而，这些系统所表现出的各种各样的流变行为给工艺设计带来了挑战。例如，蠕虫状胶束表现出高度非牛顿和/或粘弹性的流动行为，对盐浓度和温度敏感。该项目的中心目标是探索现有的关于蠕虫状胶束溶液流变学的知识是否可以有利地用于开发有效的涂层工艺，以定制纳米结构薄膜。具体而言，建议的研究将需要以下合作活动：(a)开发和优化涂层设备，以指导和控制薄膜合成过程中的自组装和分子排列，以获得高通量结果。(b)系统表征在不同的物理化学和流体动力学条件下合成的薄膜，使用表征良好的流体。(c)理论建模，以了解粘弹性和/或非牛顿效应对涂层过程的影响。预计这项研究将导致实验验证模型和数值模拟的发展，这将使工程师和研究人员能够以高产量合成纳米多孔膜。这种用户友好的数值模拟软件将在生物传感器、光学、催化、量子电子学和高能材料方面具有技术相关性。更广泛的影响包括教育目标以及代表性不足的少数群体的参与。数值模拟模块将在流体力学、传热、工艺设计和材料科学等核心课程中发挥潜在作用。

ABSTRACTPROPOSAL NO.: CTS-0404243PRINCIPAL INVESTIGATOR: AMY Q. SHENINSTITUTION: WASHINGTON UNIVERSITY NER: HIGH THROUGHPUT MANUFACTURING OF NANOPOROUS FILMS VIA FLOW-INDUCED MICELLE ALIGNMENT This proposal was received in response to Nanoscale Science and Engineering initiative, NSF 03-043, category NER. Recent advances in rheo-optical characterization and theoretical modeling of self-assembled fluids (e.g. wormlike micelles) provide unique opportunities for developing high throughput and well controlled process designs for nanostructured film synthesis. However, the wide variety of rheological behaviors that these systems exhibit poses challenges for process design. For example, wormlike micelles show highly non-Newtonian and/or viscoelastic flow behavior that is sensitive to salt concentration and temperature. The central goal of this project is to explore whether existing knowledge on the rheology of wormlike micellar solutions may be used advantageously to develop efficient coating process for tailor making nanostructured films. Specifically, the proposed research will entail the following collaborative activities: (a) Developing and optimizing a coating apparatus to guide and control the self-assembly and molecular alignment during the film synthesis for high throughput results. (b) Systematic characterization of thin films synthesized under different physiochemical and hydrodynamic conditions using well characterized fluids. (c) Theoretical modeling to understand the influence of viscoelastic and/or non-Newtonian effects on the coating process. It is envisioned that the proposed research will lead to the development of experimentally validated models and numerical simulations that will allow engineers and researchers to synthesize nanoporous films at high production rate. Such user-friendly numerical simulation software will have technological relevance in biosensors, optics, catalysis, quantum electronics, and energetic materials.Broader Impacts include educational objectives as well as the involvement of underrepresented minority groups. The numerical simulation modules will be developed for potential use in core curriculum via courses on fluid mechanics, heat transfer, process design and materials science.