Collaborative Research: ISS: Assessing the Effect of Microgravity on Growth and Properties of Metal-Organic Framework (MOF) Crystals
合作研究:ISS:评估微重力对金属有机框架 (MOF) 晶体生长和性能的影响
基本信息
- 批准号:2224464
- 负责人:
- 金额:$ 24.75万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2022
- 资助国家:美国
- 起止时间:2022-09-01 至 2025-08-31
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
Metal-organic frameworks (MOFs) are a unique class of materials consisting of a central metal ion coordinated to organic ligands that extend into two or three dimensions. MOFs have generated scientific excitement due to their extremely tunable chemical, electrical and mechanical properties with over 20,000 different structures reported and studied within the last decade. Yet, difficulties in realizing uniform, large-scale MOF crystals have hindered mass adoption, and perhaps, the viability of target applications such as hydrogen storage, membrane separation, and water splitting. In this work, MOF crystals will be grown in gravity (on Earth) and microgravity (on the International Space Station, ISS). Through experimentation in microgravity on the ISS, large, uniform MOF crystals may be grown when gravity-driven processes, such as sedimentation and buoyancy-driven convection, are removed. This collaborative award also aims to use data collected on the ISS to create analysis-based curriculum for K-12 and community college students to stimulate active student engagement with the project. Three types of MOF crystals will be grown in prolonged microgravity via an ISS-compatible, room temperature aqueous mixing process and probed upon return to Earth. This award seeks to better understand MOF crystal growth in a diffusion-controlled growth environment and identify potential advantages of growing MOFs in microgravity. It is hypothesized that long-term microgravity synthesis will produce MOF crystals that are (1) lower in defect quantity, (2) larger in size, and (3) more uniform in size and morphology compared to Earth-grown MOF crystals. The root of this hypothesis lies in solutal convection, a phenomenon that exists in isothermal, solution crystal growth on Earth. Upon crystal nucleation, MOF crystals grow by depleting the surrounding solution of the dissolved metal ion and organic linker. This process leaves behind a less-dense liquid consisting of simply aqueous solvent, compared to the denser, bulk medium with dissolved solutes. This density gradient induces convection, specifically solutal convection, under isothermal conditions. The movement and turbulency prompted by convection generates conditions for additional points of nucleation—creating countless crystallites with uneven growth rates resulting in numerous defect-prone crystals of small size (nano- to micro-scale) that are non-uniform in size and morphology. The absence of gravity alleviates the detrimental solutal convection phenomenon.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.
金属有机框架(mof)是一类独特的材料,由中心金属离子与延伸到二维或三维的有机配体配位组成。mof由于其具有可调的化学、电学和机械性能,在过去的十年中有超过20,000种不同的结构被报道和研究,从而引起了科学界的兴奋。然而,实现均匀、大规模MOF晶体的困难阻碍了大规模应用,也许也阻碍了目标应用(如储氢、膜分离和水分解)的可行性。在这项工作中,MOF晶体将在重力(在地球上)和微重力(在国际空间站,ISS)下生长。通过在国际空间站上的微重力实验,当重力驱动的过程(如沉降和浮力驱动的对流)被消除时,可以生长出大而均匀的MOF晶体。该合作奖项还旨在利用国际空间站收集的数据,为K-12和社区大学学生创建基于分析的课程,以激发学生积极参与该项目。三种类型的MOF晶体将通过国际空间站兼容的室温水混合过程在长时间微重力下生长,并在返回地球后进行探测。该奖项旨在更好地了解MOF晶体在扩散控制生长环境中的生长,并确定在微重力下生长MOF的潜在优势。假设长期微重力合成将产生的MOF晶体(1)缺陷数量更低,(2)尺寸更大,(3)尺寸和形态比地球生长的MOF晶体更均匀。这一假说的根源在于溶质对流,这是一种存在于地球上等温溶液晶体生长中的现象。在晶体成核后,MOF晶体通过耗尽周围溶解的金属离子和有机连接剂的溶液而生长。这个过程留下了密度较低的液体,由简单的水性溶剂组成,相比之下,密度较大的散装介质含有溶解的溶质。在等温条件下,这种密度梯度引起对流,特别是溶质对流。由对流引起的运动和湍流产生了附加成核点的条件——产生了无数生长速度不均匀的晶体,从而产生了许多尺寸和形貌不均匀的小尺寸(纳米到微尺度)易出现缺陷的晶体。重力的消失减轻了有害的溶质对流现象。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。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Debbie Senesky其他文献
Partial discharge diagnosis in electric motor with digital twin model-enhanced ensemble learning
基于数字孪生模型增强集成学习的电动机局部放电诊断
- DOI:
10.1016/j.ress.2025.111370 - 发表时间:
2025-12-01 - 期刊:
- 影响因子:11.000
- 作者:
Sara Kohtz;Anabel Renteria;Aaron Rodriguez;Anand Lalwani;Anjana Samarakoon;Kiruba Sivasubramaniam Haran;Debbie Senesky;Pingfeng Wang - 通讯作者:
Pingfeng Wang
Debbie Senesky的其他文献
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{{ truncateString('Debbie Senesky', 18)}}的其他基金
Conference: 2023 Workshop on Nanotechnology Infrastructure of the Future
会议:2023年未来纳米技术基础设施研讨会
- 批准号:
2331369 - 财政年份:2023
- 资助金额:
$ 24.75万 - 项目类别:
Standard Grant
ISS: Collaborative Research: Examination of the Multi-physical Properties of Microgravity-synthesized Graphene Aerogels
ISS:合作研究:微重力合成石墨烯气凝胶的多物理性质检验
- 批准号:
1929363 - 财政年份:2019
- 资助金额:
$ 24.75万 - 项目类别:
Standard Grant
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