NER: Dendrimer-Mediated Assembly of Nanostructures

本研究的重点涉及四个具体目标。 首先，将进行不同直径的γ-Fe 2 O3纳米颗粒的制造，并且使用位置交换方法用阳离子单层装饰颗粒。 第二，使用树枝状聚合物，这些粒子的自组装将被探索，并将使用小角X射线散射（SAXS）确定所得材料的有序性和粒子间间距。 第三，将使用SQUID磁力测定法量化材料的体性质。 第四，图案化的表面将创建使用电子束光刻和这些图案将被用于模板纳米复合材料组件。 通过这项纳米尺度：探索性研究（NER）奖，有机和高分子化学计划和特别项目化学办公室正在支持Vincent M.位于阿默斯特的马萨诸塞州大学化学系的Rotello说。Rotello教授将把工作重点放在使用纳米粒子生产定义明确的磁性材料上。 通过使用阴离子树枝状聚合物自组装具有阳离子功能的超顺磁性纳米颗粒，可以控制材料的颗粒间距离。 除了材料领域研究的广泛影响外，该项目还为研究生和本科生的多学科培训提供了一个很好的网站。

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.