Nanotubular Materials: Intrinsic Properties, Guest Molecules, and Functionalization

纳米管材料：固有特性、客体分子和功能化

• 批准号: 0513915
• 负责人: Yue Wu
• 金额: $ 34.5万
• 依托单位: University of North Carolina at Chapel Hill
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-07-01 至 2009-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0513915&HistoricalAwards=false
• 关键词: Nanotubular; Materials; Intrinsic; Properties; Guest

*** NON-TECHNICAL ABSTRACT ***Nanotubular materials are a unique type of one-dimensional nanomaterials. Their novel properties are intimately related to the unique tubular structures as well as to interactions with guest molecules residing inside or on the surface of the tubes. Single-walled carbon nanotubes (SWCNTs) and titania (titanium oxide) nanoscrolls are two examples of such novel materials. In this study, nuclear magnetic resonance (NMR) techniques will be employed to investigate the one-dimensional characteristics of novel electronic properties of SWCNTs. NMR will also be used to investigate water adsorption and transport inside carbon nanotubes, an issue with relevance to biological processes. A variety of techniques will be employed to characterize the structure of titania nanoscrolls. Structural modifications will be implemented to optimize properties such as optical absorption and surface chemistry. Such study could lead to various important applications including solar cells, efficient photo-catalysis, decontamination of toxic molecules, and drug delivery. The partnership formed with Meredith College, a women's college founded in 1891, will provide excellent opportunities for female students in research and education and to help guide more female students into pursuing careers in science and technology.*** TECHNICAL ABSTRACT ***Single-walled carbon nanotubes (SWCNTs) and titania nanoscrolls are two types of nanotubular materials to be investigated in this study. Characteristics of strongly correlated electron behavior of SWCNTs, such as the Luttinger liquid behavior, will be studied by 13C nuclear magnetic resonance (NMR). Adsorption of water inside SWCNTs confined in a region of nanometer in diameter could lead to ordered structures with unique molecular dynamics. Vapor-liquid equilibrium isotherms will be measured using 1H NMR with simultaneous characterization of molecular dynamics. An important area in the research of titania materials is the effort to reduce their band gaps such that efficient harvesting of solar energy can be realized. Using interactions with guest molecules, titania nanoscrolls offer unique ways for structural modifications that are not possible with titania nanocrystals. Such modified titania nanoscrolls could have red-shifted optical absorption spectra. A variety of characterization techniques and approaches will be used to characterize and optimize the structures and properties of titania nanoscrolls aimed at a wide range of applications. The partnership formed with Meredith College, a women's college founded in 1891, will provide excellent opportunities for female students in research and education. The goal is to help guide more female students into pursuing careers in science and technology.

* 非技术摘要 * 纳米管材料是一种独特的一维纳米材料。它们的新特性与独特的管状结构以及与驻留在管内部或表面上的客体分子的相互作用密切相关。单壁碳纳米管（SWCNT）和二氧化钛（氧化钛）纳米卷是这种新型材料的两个例子。本研究将利用核磁共振技术探讨单壁碳纳米管的一维电子特性。 NMR还将用于研究碳纳米管内部的水吸附和运输，这是一个与生物过程相关的问题。将采用各种技术来表征二氧化钛纳米卷的结构。将进行结构修饰以优化光学吸收和表面化学等特性。这种研究可能会导致各种重要的应用，包括太阳能电池，高效光催化，有毒分子的净化和药物输送。与成立于1891年的女子学院梅雷迪思学院建立的伙伴关系将为女学生提供研究和教育的绝佳机会，并帮助引导更多的女学生从事科学和技术职业。技术摘要 * 单壁碳纳米管（SWCNT）和二氧化钛纳米卷是本研究中要研究的两种类型的纳米管材料。通过13 C核磁共振（NMR）研究SWCNTs的强相关电子行为的特征，例如Luttinger液体行为。单壁碳纳米管在纳米尺度范围内吸附水，可以形成具有独特分子动力学的有序结构。将使用1H NMR测量汽液平衡等温线，同时进行分子动力学表征。二氧化钛材料研究中的一个重要领域是努力减小它们的带隙，使得可以实现太阳能的有效收集。利用与客体分子的相互作用，二氧化钛纳米卷提供了独特的方式进行结构修饰，这是不可能与二氧化钛纳米晶体。这种改性的二氧化钛纳米卷可以具有红移的光学吸收光谱。各种表征技术和方法将用于表征和优化的二氧化钛纳米卷的结构和性能，旨在广泛的应用。与成立于1891年的女子学院梅雷迪思学院建立的伙伴关系将为女学生提供研究和教育的绝佳机会。目标是帮助引导更多的女学生从事科学和技术职业。