ERI: Increasing the Fundamental Understanding of the Auxetic Behavior of Graphene Oxide Membranes

ERI：增加对氧化石墨烯膜拉胀行为的基本了解

• 批准号: 2301838
• 负责人: Yijing Stehle
• 金额: $ 20万
• 依托单位: Union College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-07-01 至 2025-06-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2301838&HistoricalAwards=false
• 关键词: ERI; Increasing; Fundamental; Understanding; Auxetic

When materials are stretched in one direction, it is typical that the dimensions in the other directions tend to decrease. However, some advanced materials, known as auxetic materials, exhibit a cross-sectional expansion that is perpendicular to the force applied during stretching. Auxetic materials are currently used in applications such as body armor, packing materials, knee and elbow pads, and sponge mops. Graphene oxide membranes are identified with auxetic behavior, which make them excellent candidate for a wide range of promising separation and filtration applications in the biomedical, automobile, and defense industries, and for clean energy. However, there is still a limited understanding of the underlying mechanism in their auxetic behavior. In this Engineering Research Initiation (ERI) project, a series of experiments will be carried out to gain a deeper understanding of the structure of graphene oxide membranes that causes its auxetic behavior. This project will provide research experiences for undergraduate students at Union College, especially those from traditionally underrepresented backgrounds. These research experiences will prepare students for scientific and technical careers, and/or graduate studies in nanotechnology-based industries. In addition, the research will be integrated into Union’s mechanical engineering curriculum to improve engineering education. The objectives of this project are two-fold: 1) to achieve a fundamental understanding of the auxetic behavior of graphene oxide membranes by conducting experiments based on two hypotheses - the “wrinkle” and/or the “auxetic framework” are responsible for the behavior, and 2) to investigate how negative Poisson ratio customization affects the mechanical properties, stability, permeability, and potential applications of the membranes. Specifically, this experimental research will explore the relationship between the negative Poisson ratio and the size, orientation, and deformation of wrinkles, as per the "wrinkle" hypothesis. It will also investigate the correlation between the negative Poisson ratio and the oxygen/carbon atomic ratio of the "auxetic framework" hypothesis. By combining experimental studies and dynamic analyses, this project aims to not only identify the structural basis of graphene oxide membrane's auxetic behavior but also devise techniques for customizing this behavior to address a range of engineering challenges. This research project is also expected to lay the groundwork for the PI’s future research endeavors in the short and long term.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.

当材料在一个方向上拉伸时，通常在其他方向上的尺寸趋于减小。然而，一些被称为拉胀材料的先进材料表现出与拉伸期间施加的力垂直的横截面膨胀。吸湿材料目前用于诸如防弹衣、包装材料、护膝和护肘以及海绵拖把的应用中。氧化石墨烯膜具有拉胀行为，这使它们成为生物医学、汽车和国防工业以及清洁能源中广泛的有前途的分离和过滤应用的优秀候选者。然而，仍然有一个有限的了解，在其拉胀行为的潜在机制。在这个工程研究启动（ERI）项目中，将进行一系列实验，以更深入地了解导致其拉胀行为的氧化石墨烯膜的结构。该项目将为联合学院的本科生提供研究经验，特别是那些传统上代表性不足的背景。这些研究经验将为学生的科学和技术职业生涯做好准备，和/或在纳米技术为基础的行业研究生学习。此外，该研究将被纳入联盟的机械工程课程，以改善工程教育。该项目的目标是双重的：1）通过基于两个假设进行实验来实现对氧化石墨烯膜的拉胀行为的基本理解-“褶皱”和/或“拉胀框架”负责该行为，以及2）研究负泊松比定制如何影响膜的机械性能，稳定性，渗透性和潜在应用。具体而言，本实验研究将探索负泊松比与皱纹的大小，方向和变形之间的关系，根据“皱纹”假说。它还将调查负泊松比和氧/碳原子比的“拉胀框架”假说之间的相关性。通过结合实验研究和动态分析，该项目的目的不仅是确定氧化石墨烯膜的拉胀行为的结构基础，而且还设计了定制这种行为的技术，以解决一系列工程挑战。该研究项目也有望为PI未来的短期和长期研究工作奠定基础。该奖项反映了NSF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。

项目成果

Dielectric performance of aluminum cation modified graphene oxide membrane: Influence of Al source

• DOI: 10.1016/j.diamond.2023.110601
• 发表时间: 2023-11
• 期刊: Diamond and Related Materials
• 影响因子: 4.1
• 作者: Yijing Y Stehle;Maren Friday;Timothy J. Barnum;Qin Zou