Nanometer Scale Surface-Mounted Molecular Dipolar Rotors and Rotor Arrays

这个功能纳米技术奖教授约瑟夫·米歇尔和约翰 科罗拉多大学博尔德分校的普莱斯和科罗拉多大学的马克·拉特纳教授 西北大学是由先进材料和 化学、表面工程和摩擦学处理程序 土木和机械系统部的计划，国际计划部的西欧计划和办公室 数学和物理科学的多学科活动 董事会。本研究涉及的设计，合成， 纳米级表面组装分子偶极的表征 转子和转子阵列。基本设备将是一个表面安装的 分子偶极转子，其基础共价连接到一个平面 绝缘表面，并支撑垂直于绝缘表面安装的轴。 表面，该表面又支撑平衡的1- 2nm直径转子， 大面内电偶极矩。 轴承，一个基本的 分子尺度力学的元素将由金属到π面组成 邦德单转子和相互作用转子的自组装阵列 将被建造。 转子的尺寸和转动惯量， 表面以上的高度，旋转摩擦， 偶极，偶极阵列的间距及其居里温度， 传播速度和耗散将由适当的 化学结构设计。 转子阵列具有许多潜在的应用，如铁电， 压电和热电材料，并将有助于减少 电压可调滤波器、振荡器和移相器的尺寸 如传感器、致动器、延迟线和谐振器。 这种进步将 最终有助于RF产品的小型化， 手机和无线调制解调器。协同作用， 参与合成、表征和理论研究 将提供一个宝贵的，跨学科的学习经验， 学生参与。

This Functional Nanotechnology award to Professors Josef Michl and John Price at the University of Colorado-Boulder and Professor Mark Ratner at Northwestern University is supported by the Advanced Materials and Processing Program in Chemistry, the Surface Engineering and Tribology Program in the Division of Civil and Mechanical Systems, the Western Europe Program in the Division of International Programs and the Office of Multidisciplinary Activities in the Mathematical and Physical Sciences Directorate. The research deals with the design, synthesis and characterization of nanometer scale surface-mounted molecular dipolar rotors and rotor arrays. The basic device will be a surface-mounted molecular dipolar rotor, whose base attaches covalently to a flat insulating surface and supports an axis mounted perpendicularly to the surface, which in turn supports a balanced 1-2 nm diameter rotor with a large in-plane electric dipole moment. The bearing, a fundamental element of molecular-scale mechanics will consist of a metal-to-pi-face bond. Both single rotors and self-assembling arrays of interacting rotors will be constructed. The size and moment of inertia of the rotor, its height above the surface, the rotational friction, the magnitude of the dipole, the spacing of the dipole array and its Curie temperature, propagation velocities and dissipation will be controlled by appropriate design of chemical structures. Rotor arrays have many potential applications as ferroelectric, piezoelectric and pyroelectric materials, and will be useful in reducing the size of voltage-tunable filters, oscillators, phase-shifters as well as sensors, actuators, delay lines and resonators. Such advances would ultimately contribute to miniaturization of RF products such as cellular handsets and wireless modems. Synergistic interactions between the participating investigators in synthesis, characterization and theory will provide a valuable, interdisciplinary learning experience for the students involved.