CAREER: Magnetic Field-Driven Self-Assembly of Magnetic and Multifunctional Nanochains in Bulk Matrices

技术概述：理解和控制自组装对于利用纳米级前体制造先进材料至关重要。在地球上导航的趋磁细菌？利用磁偶联链的氧化铁纳米颗粒，激发了这个项目。由固态和材料化学计划（SSMC）支持的CAREER奖的目标是演示和理解磁场驱动的磁性和多功能纳米颗粒自组装成块矩阵链，并测量和理解这些纳米结构复合材料的新结构和磁性、光学、机械和电学性能。磁场驱动的纳米颗粒自组装是一个很大程度上尚未开发的领域，它有可能在不使用模板的情况下将链排列成具有可调间距的三维阵列。磁场驱动自组装的概念具有广泛的意义：如果一个成分是磁性的，也可以组装多功能纳米颗粒链。本研究项目及相关课题将纳入PI？他正在开发一门纳米科学和纳米技术实验室课程。非技术概述：我们非常需要开发出制造具有精确控制结构的宏观三维复合材料的方法。由固态和材料化学计划（SSMC）支持的CAREER奖的研究部分是对施加磁场如何使磁性纳米颗粒形成具有均匀尺寸和间距的链的研究。了解纳米粒子的组成和磁场强度对这些新结构形成的影响，将有助于开发精确控制纳米粒子组装的方法和制造新的复合材料。组装的纳米颗粒之间的相互作用以及与周围基质的相互作用有望产生新的特性，这些特性在各种应用中都有潜在的用途。在该奖项的外展部分，PI将与一位教育学教授和一位高中教师合作制定一项纳米技术外展计划（NOP）。NOP将包括PI和学生访问周围的高中班级，就纳米技术进行演示和讲座，并在学区安排教师讲习班，介绍纳米技术的概念，并将包括可用于教师的材料。课程计划。

TECHNICAL SUMMARY:Understanding and controlling self-assembly is crucial for engineering advanced materials from nanoscale precursors. Magnetotactic bacteria, which navigate in the earth?s magnetic field using magnetically-coupled chains of iron oxide nanoparticles, have inspired this project. The objective of this CAREER award, supported by the Solid State and Materials Chemistry program (SSMC), is to demonstrate and understand the magnetic field-driven self-assembly of magnetic and multifunctional nanoparticles into chains in bulk matrices, and to measure and understand the novel structures and magnetic, optical, mechanical, and electrical properties of these nanostructured composites. Magnetic field-driven self-assembly of nanoparticles in bulk matrices is a largely unexplored area, which has potential to arrange chains in three-dimensional arrays with tunable spacing without using a template. The concept of magnetic field-driven self-assembly is of broad significance: Chains of multifunctional nanoparticles can also be assembled if one component is magnetic. This research project and related topics will be integrated into the PI?s Introduction to Nanomaterials course and into a nanoscience and nanotechnology lab course that he is developing.NON-TECHNICAL SUMMARY:There is a great need to develop methods to fabricate macroscopic, three-dimensional composites with precisely controlled structures. The research component of this CAREER award, supported by the Solid State and Materials Chemistry program (SSMC), is an investigation of how applying magnetic fields causes magnetic nanoparticles to form chains with uniform dimensions and spacing. An understanding of the influence of the make-up of the nanoparticle and the strength of the magnetic field on the formation of these new structures will be useful for developing methods to control precisely the assembly of nanoparticles and for the fabrication of new composite materials. Interactions among the assembled nanoparticles and with the surrounding matrix are expected to give rise to novel properties that are potentially useful for diverse applications. In the outreach component of this award, the PI will develop a Nanotechnology Outreach Program (NOP) in collaboration with a professor of education and a high school teacher. The NOP will include visits by the PI and students to surrounding high school classes to give demonstrations and lectures on nanotechnology and teacher workshops arranged through school districts that will introduce the concepts of nanotechnology and will include materials that could be used in teachers? lesson plans.