RII Track-4: Use of Positron Annihilation Lifetime Spectroscopy to Engineer Membrane Selective Layers

RII Track-4：使用正电子湮没寿命光谱来设计膜选择性层

• 批准号: 1928812
• 负责人: Steven Weinman
• 金额: $ 23.35万
• 依托单位: University of Alabama Tuscaloosa
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-12-01 至 2024-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1928812&HistoricalAwards=false
• 关键词: RII; Track; Use; Positron; Annihilation

This project seeks to build on the water research at The University of Alabama at Tuscaloosa (UA). With a wealth of natural water sources and access to the Gulf of Mexico, Alabama is an ideal location for research in water treatment processes. As such, UA has made water one of its four research pillars to provide better water quality for all people. Polyamide membranes, often called reverse osmosis or RO membranes, are commonly used for seawater desalination. However, their molecular level properties are not well understood. This project will allow researchers from UA to conduct studies at the National Institute of Standards and Technology (NIST) to learn a new technique to characterize the molecular-level properties of water treatment polymer membranes. This research seeks to understand how synthesis conditions affect membrane performance at the molecular level, specifically those involved in seawater desalination. The polymer characterization technique will be of great benefit to make these membranes more energy-efficient and cost-effective. This work will initially provide training for one graduate student, and results will be integrated into undergraduate curriculum and research. The research collaboration formed through this project will help develop capacity at UA to characterize polymers using cutting-edge technology, providing additional opportunities to educate and train graduate and undergraduate students.The goal of the proposed project is to engineer polyamide membrane separation layers by utilizing Positron Annihilation Lifetime Spectroscopy (PALS). PALS is used to probe material defects, voids, and free volume at the sub-nm scale and is therefore useful for characterizing porous materials, such as polymeric membranes. Polyamide membrane separation layers will be synthesized via the reaction between the monomers m-phenylenediamine and trimesoyl chloride. Polymerization conditions such as monomer concentration and polymerization time will be varied to determine how each affects the polyamide separation layer free volume on a molecular level instead of a macroscopic level. Free volume characterization of the polyamide membrane separation layers will be performed using the PALS system at NIST. The use of a PALS system will allow for the development of a more basic understanding of how these polyamide membranes separate on a molecular level and what factors influence the free volume and separation properties of these polymeric membranes. By understanding the fundamental reason why polymerization conditions affect polyamide free volume, and therefore the desalination performance on the molecular level, polyamide membranes can be engineered to make membrane-based separation processes more energy-efficient and cost-effective. The collaboration developed between UA and NIST will generate high-quality undergraduate and graduate research opportunities in the field of water treatment while advancing one of UA's research pillars to raise the bar in the quest for better water for all.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.

该项目旨在基于塔斯卡卢萨（UA）的阿拉巴马大学的水研究。阿拉巴马州拥有丰富的天然水源并进入墨西哥湾，是水处理过程研究的理想场所。因此，UA将水成为其四个研究支柱之一，为所有人提供更好的水质。聚酰胺膜通常称为反渗透或RO膜，通常用于海水脱盐。但是，它们的分子水平特性尚不清楚。该项目将使UA的研究人员能够在美国国家标准技术研究所（NIST）进行研究，以学习一种新技术，以表征水处理聚合物膜的分子级特性。这项研究试图了解合成条件如何影响分子水平的膜性能，特别是参与海水脱盐的膜性能。聚合物表征技术将使这些膜更节能和成本效益有很大的好处。这项工作最初将为一名研究生提供培训，结果将融入本科课程和研究中。通过该项目成立的研究合作将有助于在UA的能力中开发使用尖端技术来表征聚合物的能力，从而提供更多的机会来教育和培训毕业生和本科生。拟议项目的目的是通过利用Positron nihihihihihihihihihihihihihihihihihihihihihihihihihihihihihiantime spectroscopy（PALS）来设计多酰胺膜分离层。 PAL用于以亚NM量表探测材料缺陷，空隙和游离体积，因此可用于表征多孔材料，例如聚合物膜。聚酰胺膜分离层将通过单体M-苯基二胺和Trimeoyl氯化物之间的反应合成。聚合条件（例如单体浓度和聚合时间）将变化，以确定每个分子水平上的多酰胺分离层自由体积如何影响分子水平而不是宏观镜水平。将使用NIST的PALS系统进行聚酰胺膜分离层的自由体积表征。 PALS系统的使用将允许对这些聚酰胺膜如何在分子水平分离以及哪些因素影响这些聚合物膜的自由体积和分离特性的更基本了解。通过理解聚合条件影响无聚酰胺体积的基本原因，因此可以对分子水平的脱盐性能进行设计，可以设计聚酰胺膜以使基于膜的分离过程更节能且具有成本效益。 UA和NIST之间的合作将在水处理领域产生高质量的本科和研究生研究机会，同时推进了UA的一个研究支柱之一，以提高律师资格，以寻求所有的所有人，以寻求更好的水。

项目成果

Modification of polyamide reverse osmosis membranes for the separation of urea

• DOI: 10.1016/j.memsci.2022.120584
• 发表时间: 2022-05-01
• 期刊: JOURNAL OF MEMBRANE SCIENCE
• 影响因子: 9.5
• 作者: Habib, Shahriar;Weinman, Steven T.
• 通讯作者: Weinman, Steven T.

Emerging investigator series: post-synthesis modification of reverse osmosis membranes for the enhanced separation of small neutral molecules

新兴研究者系列：反渗透膜的合成后修饰，以增强中性小分子的分离

• DOI: 10.1039/d3ew00401e
• 发表时间: 2023
• 期刊: Environmental Science: Water Research & Technology
• 作者: Habib, Shahriar;Wilkins, Madison A.;Weinman, Steven T.
• 通讯作者: Weinman, Steven T.

A review on the synthesis of fully aromatic polyamide reverse osmosis membranes

• DOI: 10.1016/j.desal.2021.114939
• 发表时间: 2021-01-16
• 期刊: DESALINATION
• 影响因子: 9.9
• 作者: Habib, Shahriar;Weinman, Steven T.
• 通讯作者: Weinman, Steven T.

Effect of surfactant structure on MPD diffusion for interfacial polymerization

• DOI: 10.1016/j.memlet.2023.100055
• 发表时间: 2023
• 期刊: Journal of Membrane Science Letters
• 作者: Shahriar Habib;Bryn E. Larson;S. Weinman