Directed Assembly of One-Dimensional Nanopeapod Structures through the Capture of Preformed Nanoparticles in Scrolled Nanosheets

新奥尔良大学的约翰·b·威利（John B. Wiley）获得了化学系大分子、超分子和纳米化学项目的奖励，以研究纳米尺度（十亿分之一米）化学结构中的一种不寻常的基元。将小尺度对象（纳米对象）组织成有序数组的能力对新技术的发展非常重要。在这个项目中，新的豆荚状结构由小球体和非常薄的薄片组装而成。然后，根据组装方法、成分变化和物理性质对材料进行研究。这类材料引起人们的兴趣，因为它们可以在许多领域带来重要的技术进步，包括磁学、电子学、光催化和药物输送。本科生和研究生参与该项目研究的各个方面，为他们提供新纳米结构的合成和表征以及科学数据的展示和出版方面的宝贵培训。还有来自法国的本科生来到研究小组的实验室工作，在国际水平上促进化学的发展。最后，为了促进新奥尔良地区的科学发展，当地的高中生每年夏天都参加这个研究项目。通过在滚动纳米片上捕获纳米颗粒形成纳米脚结构的能力为一维纳米结构的组装提供了一种新的方法。该项目侧重于纳米颗粒组装和纳米片滚动的那些方面，特别是对扩展豆荚纳米结构的形成很重要。该计划涉及合成/组装，表征和机理研究的组合。这项工作的目标是1)更好地理解和控制纳米豆荚结构的组装，2)利用豆荚组装来指导复杂复合材料的形成，3)将这些努力扩展到已知形成卷轴的其他宿主材料，以及4)检查这些组装过程的可逆性前景。例如，通过对其尺寸和形状选择性的研究来了解装配过程。其他的进展正在通过混合纳米粒子组件的性质调整（磁性、光学和/或电子）而得到发展。虽然该小组最早的研究是基于己酸盐纳米片，但他们正在寻找新的卷轴成分，包括等结构钽酸盐、层状钙钛矿、过渡金属二硫族化合物和石墨烯。作为纳米组装中“捕获-释放”概念的一部分，研究人员正在研究这些结构滚动的可逆性。

John B. Wiley at the University of New Orleans is supported by an award from the Macromolecular, Supramolecular and Nanochemistry Program in the Division of Chemistry to investigate an unusual motif in chemical structures on the scale of nanometers (billionths of a meter). The ability to organize small scale objects (nanoobjects) into ordered arrays is important to the development of new technologies. In this project, new peapod-like structures are assembled from small spheres and very thin sheets. The materials are then studied in terms of methods of assembly, variations in composition, and physical properties. Such materials are of interest in that they could lead to important technological advances in a variety of areas including magnetics, electronics, photocatalysis, and drug delivery. Undergraduate and graduate students are involved in all aspects of the research component of this program, providing them with valuable training in the synthesis and characterization of new nanostructures as well as the presentation and publication of scientific data. There are also undergraduate students from France who come to work in the research group's laboratory, promoting chemistry at the international level. Finally, to help promote science in the New Orleans area, local high school students are involved in this research program each summer.The ability to form nanopeapod structures by the capture of nanoparticles in scrolled nanosheets offers a new approach to the assembly of 1-D nanostructures. This project focuses on those aspects of nanoparticle assembly and nanosheet scrolling specifically important to the formation of extended peapod nanostructures. The program involves a combination of synthesis/assembly, characterization, and mechanistic studies. The goals of this effort are to 1) better understand and control the assembly of nanopeapod structures, 2) utilize peapod assembly in directing the formation of intricate composites, 3) extend these efforts to other host materials known to form scrolls, and 4) examine the prospect of reversibility in these assembly processes. Understanding of the assembly process is being pursued through, for example, investigations of its size and shape selectivity. Other advances are being developed through property tuning (magnetic, optical and/or electronic) in mixed nanoparticle assemblies. While the earliest investigations of the group were based on hexaniobate nanosheets, new scroll components are being sought, including isostructural tantalates, layered perovskites, transition metal dichalcogenides and graphene. Reversibility in scrolling of these structures is being examined as part of a 'capture-release' concept in nanoassembly.