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.

技术纳米管材料具有独特的水传输和储存特性，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。新型杂化材料，如金属-有机纳米管（MONs）的发展是特别感兴趣的，因为它们适合于结构工程策略，并可能表现出独特的性能的基础上存在的无机成分。 该计划的目的是确定U（VI）MON的结构特征，该结构特征最近被证明可以促进结构水的形成和有前途的交换性能。 假设U（VI）MON的独特性质是由以下因素的组合产生的：（1）有机连接体的两性离子性质，（2）管的总直径，和（3）铀酰（UO 2）阳离子的存在。这一假设将通过合成具有不同结构特征的MONs、表征水构型以及通过衍射和光谱技术相结合检查所得材料的交换性质来进行测试。含有缺乏氨基的有机连接体的材料将最初作为目标（目标1），以研究两性离子分子吸引H2O进入纳米管内部的重要性。接下来，将通过改变两性离子连接体的链长和有机螯合剂的选择来研究管的内径的重要性（目的2）。最后，将通过设计含有通过两性离子分子连接的其他金属的MONs来检查铀酰离子的重要性（目标3）。这些研究意义重大，因为它们将允许确定对这些增强的交换性质施加最大控制的结构组分，并开发新的纳米分子材料，用于分离和储存技术的潜在应用。非物质性计划中的研究具有潜在的变革性，因为从实验结果中获得的基本信息可能导致对水的纳米限制的更好理解，它影响着各种各样的生物、地质和物理系统。关于MONs内承压水流动性的实验将支持NMR用户设施，使该设施能够更新所有研究小组广泛使用的现有仪器。这项工作还通过开发用于分离和存储介质的先进应用的新材料以及加强结构和纳米分子化学的本科和研究生教育，对社会产生了更广泛的利益。教育方面的贡献包括指导一名研究生进行与MON材料合成有关的研究，以及制定旨在促进本科生STEM教育的举措。这些举措包括努力：（1）在二年级无机化学课程中为本科生创建关于纳米材料结构性质的引人入胜的课程;（2）通过McNair Scholar计划招募代表性不足的少数民族学生参加研究小组，参与纳米管材料的合成;以及（3）将本科生纳入关于纳米材料在水净化中的作用的非正式科学教育工作中。