NER: Dendrimer-Mediated Assembly of Nanostructures

这项研究的重点涉及四个具体目标。 首先，将制造不同直径的γ-Fe2O3纳米颗粒，并使用位置交换方法用阳离子单分子层装饰颗粒。 其次，使用树枝状聚合物，将探索这些颗粒的自组装，并使用小角 X 射线散射 (SAXS) 确定所得材料的排序和颗粒间间距。 第三，材料的整体特性将使用 SQUID 磁力测定法进行量化。 第四，将使用电子束光刻技术创建图案化表面，并且这些图案将用于模板纳米复合材料组件。 由此产生的系统将使用磁力显微镜进行研究。有机和高分子化学项目和特别项目化学办公室通过获得纳米级：探索性研究（NER）奖来支持马萨诸塞大学阿默斯特分校化学系的 Vincent M. Rotello 博士的研究。 Rotello 教授的工作重点是使用纳米颗粒生产明确的磁性材料。 该材料的颗粒间距离将通过使用阴离子树枝状聚合物具有阳离子功能的超顺磁性纳米颗粒的自组装来控制。 除了材料领域研究的更广泛影响之外，该项目还为研究生和本科生的多学科培训提供了一个绝佳的场所。

The focus of this research involves four specific aims. First, the fabrication of gamma-Fe2O3 nanoparticles of varying diameters will be carried out and the particles will be decorated with cationic monolayers using a place exchange method. Second, using dendrimers, the self-assembly of theses particles will be explored and the ordering and interparticle spacing of the resulting materials will be determined using Small Angle X-Ray Scattering (SAXS). Third, the bulk properties of the materials will be quantified using SQUID magnetometry. Fourth, patterned surfaces will be created using electron beam lithography and these patterns will be employed to template nanocomposite assembly. The resulting systems will be studied using magnetic force microscopy.With this Nanoscale: Exploratory Research (NER) award, the Organic and Macromolecular Chemistry Program and the Chemistry Office of Special Projects are supporting the research of Dr. Vincent M. Rotello of the Department of Chemistry at the University of Massachusetts, Amherst. Professor Rotello will focus his work on the use of nanoparticles for the production of well-defined magnetic materials. The interparticle distance of the materials will be controlled through self-assembly of superparamagnetic nanoparticles featuring cationic functionality using anionic dendrimers. In addition to the broader impact of the research in the materials area, the project presents an excellent site for the multidisciplinary training of graduate and undergraduate students.