CAREER: Development of metal-organic nanotubes with unique water transport and storage properties

职业：开发具有独特水传输和储存特性的金属有机纳米管

• 批准号: 1252831
• 负责人: Tori Forbes
• 金额: $ 50.92万
• 依托单位: University of Iowa
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-07-01 至 2019-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1252831&HistoricalAwards=false
• 关键词: CAREER; Development; metal; organic; nanotubes

TECHNICAL Nanotubular materials can have unique water transport and storage properties that have the potential to lead to technological advances in separations, catalysis, drug delivery, and environmental remediation. Development of novel hybrid materials, such as metal-organic nanotubes (MONs) are of particular interest as they are amenable to structural engineering strategies and may exhibit unique properties based upon the presence of inorganic components. The objective of this program is to determine the structural characteristics of the U(VI) MON that has recently been shown to promote the formation of structural water and promising exchange properties. The unique properties of the U(VI) MON are hypothesized to occur from a combination of: (1) the zwitterionic nature of the organic linker, (2) the overall diameter of the tube, and (3) the presence of uranyl (UO2) cation. The hypothesis will be tested by the synthesis of MONs with different structural features, characterization of water configuration, and examination the exchange properties of the resulting material by a combination of diffraction and spectroscopic techniques. Materials that contain organic linkers lacking amino groups will be initially targeted (Objective 1) to investigate the importance of the zwitterionic molecules for the attraction of H2O into the interior of the nanotube. Next, the importance of the internal diameter of the tube will be investigated by varying the chain length of the zwitterionic linker and the choice of organic chelator (Objective 2). Lastly, the importance of the uranyl ion will be examined by designing MONs containing other metals linked through zwitterionic molecules (Objective 3). The studies are significant because they will allow the determination of the structural component that exerts the greatest control over these enhanced exchange properties and develop novel nanomolecular materials for potential application in separations and storage technologies.NON TECHNICALThe planned studies are potentially transformative because fundamental information gained from the experimental results could lead to a greater understanding of nanoconfinement of water, which influences a wide variety of biological, geological, and physical systems. Experiments on the mobility of confined water within the MONs will support the NMR user facility that will enable the facility to update the current instruments that are widely available to all research groups. The work also has more general benefits to society through the development of novel materials for advanced applications in separations and storage media and the enhancement of undergraduate and graduate education in structural and nanomolecular chemistry. Educational contributions include mentoring of a graduate student on research related to the synthesis of MON materials and the development of initiatives aimed at promoting STEM education for undergraduate students. The initiatives include efforts to: (1) create an engaging curriculum on the structural nature of nanomaterials for undergraduate students in a 2nd-year inorganic chemistry course; (2) recruit underrepresented minority students into the research group to participate in the synthesis of nanotubular materials through the McNair Scholar program; and (3) integrate undergraduate students in informal science education efforts regarding the role of nanomaterials in water purification.

技术纳米管材料可以具有独特的水运输和存储特性，这些特性有可能导致分离，催化，药物输送和环境修复方面的技术进步。新型杂种材料的开发，例如金属有机纳米管（MONS）特别感兴趣，因为它们适合结构工程策略，并且可能基于无机组件的存在表现出独特的特性。 该程序的目的是确定最近已证明可以促进结构水和有希望的交换特性的U（VI）MON的结构特征。 假设U（VI）MON的独特特性是由以下组合出现的：（1）有机连接器的zwitterionic性质，（2）管的整体直径，以及（3）铀酰（UO2）阳离子的存在。该假设将通过具有不同结构特征的MON的合成，水的表征以及通过衍射和光谱技术的结合来检验所得材料的交换特性。最初将针对含有缺乏氨基的有机接头的材料（目标1），以研究Zwitterionic分子对将H2O吸引到纳米管内部的重要性。接下来，将通过改变Zwitterionic接头的链长和有机螯合剂的选择来研究管的内径的重要性（目标2）。最后，将通过设计包含通过zwitterionic分子连接的其他金属的MON来检查铀酰离子的重要性（目标3）。这些研究之所以重要，是因为它们将允许确定对这些增强的交换特性的最大控制的结构成分，并开发出新型的纳米分子材料，以在分离和储存技术中的潜在应用中应用。没有技术研究的潜在变革性，因为从实验结果中获得的基本信息可能会导致对纳米对纳米构成系统的理解，从而使多样性地构成各种纳米元素。关于MONS中受限水的流动性的实验将支持NMR用户设施，该设施将使该设施能够更新所有研究小组广泛使用的当前工具。这项工作还通过开发新的材料来为社会带来更大的一般利益，用于分离和存储媒体的高级应用，并增强结构和纳米分子化学的本科和研究生教育。教育贡献包括指导研究生关于与元素合成有关的研究以及旨在促进本科生STEM教育的计划的发展。这些举措包括：（1）在二年级的无机化学课程中，为本科生的纳米材料的结构性质创建引人入胜的课程； （2）通过McNair Scholar计划将代表性不足的少数族裔学生招募到研究小组中，以参与纳米管材料的合成； （3）将本科生纳入非正式科学教育工作，内容涉及纳米材料在净水中的作用。