EAGER: Tunable Gas Separation Membrane Fabrication via Paramagnetically-induced Arrangement of 2D Nanomaterials

气体分离工艺在化学和燃料制造以及减少大气排放方面发挥着至关重要的作用。基于纳米材料的膜在实现更高效和可持续的气体分离方面具有巨大的潜力。这些膜由原子薄层(二维或二维)组成，允许所需的气体分子以最小的阻力和高选择性通过，同时阻止其他分子通过。膜层内颗粒间距和纳米通道路径的排列决定了分子在膜层上的运动。遗憾的是，使用现有的大规模膜制备方法很难控制这些层间结构，阻碍了最有前途的2D纳米材料基膜的有效商业化。这项研究项目通过开发一种创新的薄膜制备方法来解决控制分子分离和纳米级层间结构的挑战，该方法利用可变磁场来操纵纳米通道的形成。该项目的预期成果包括具有优异分子传输性能的功能性2D纳米材料基膜和一种新的膜制备技术，为新型混合基质-膜填充材料开辟了新的途径。除了技术贡献外，该项目还将支持两名博士生和两名本科生的成长和发展。通过参与这个项目，这些学生将获得宝贵的技术和专业技能，为未来在STEM领域的职业生涯做好准备。此外，该项目将通过服务和体验式学习活动以及与K-12学校的合作，积极让社区参与。这一项目旨在通过创造知识共享机会和激励下一代科学家和工程师来促进社会福祉。该项目解决了对可扩展的二维(2D)层状膜制作方法的需求，以可靠地控制纳米通道的形成，赋予其卓越的选择性和气体传输特性。研究人员预计，在层状薄膜制备过程中，向顺磁性2D纳米材料组装施加受控磁场将导致具有可调的选择性纳米通道的膜，其中施加的磁场强度调节纳米通道的形成机制。为了确定这一膜制备概念的可行性，将通过离子插层将室温顺磁化引入到2D纳米材料中。将施加均匀的磁场来实现均匀的纳米颗粒沉积，并将评估通过施加的磁场强度来控制纳米通道尺寸的能力。在高纳米颗粒负载量下使用磁场诱导组装时，将评估团聚倾向。最后，将考虑混合基膜制造过程中纳米颗粒原位迁移形成空洞的影响。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

Gas separation processes play a crucial role in chemical and fuel manufacturing and in reducing atmospheric emissions. Nanomaterial-based membranes hold immense potential to achieve more efficient and sustainable gas separations. These membranes, composed of atomically thin (2-dimensional or 2D) layers, allow the desired gas molecules to pass through with minimal resistance and high selectivity while blocking the passage of others. The arrangement of interparticle spacing and nanochannel pathways within the membrane layers determines the movement of molecules across it. Unfortunately, controlling these interlayer structures using existing large-scale membrane fabrication methods is difficult, hindering the effective commercialization of the most promising 2D nanomaterial-based membranes. This research project addresses the challenge of controlling molecular separations and nanoscale interlayer structures by developing an innovative approach to membrane fabrication that utilizes variable magnetic fields to manipulate the formation of nanochannels. The anticipated outcomes of this project include a functional 2D nanomaterial-based membrane with superior molecular transport properties and a novel technique for membrane fabrication, opening up new avenues for novel mixed-matrix-membrane filler materials. In addition to its technical contributions, this project will support the growth and development of two Ph.D. students and two undergraduate researchers. By engaging in this project, these students will acquire valuable technical and professional skills, positioning themselves for future careers in STEM fields. Furthermore, the project will actively involve the community through service and experiential learning activities and collaborations with K-12 schools. This engagement aims to foster societal well-being by creating knowledge-sharing opportunities and inspiring the next generation of scientists and engineers.This project addresses the need for a scalable two-dimensional (2D) lamellar membrane fabrication method to control nanochannel formation reliably, imparting superior selectivity and gas transport properties. The investigator anticipates that applying a controlled magnetic field to a paramagnetic 2D nanomaterials assembly during lamellar membrane fabrication will result in membranes with tunable selective nanochannels, where the applied field strength modulates the nanochannel formation mechanism. To determine the feasibility of this membrane fabrication concept, room temperature paramagnetization will be introduced into 2D nanomaterials through ion intercalation. A uniform magnetic field will be applied to achieve homogenous nanoparticle deposition, and the ability to control nanochannel size via the applied field strength will be evaluated. The agglomeration tendency will be assessed while using a magnetic field-induced assembly at high nanoparticle loading. Finally, the effect of void formation by in-situ nanoparticle migration during mixed-matrix membrane fabrication will be considered.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.