Structure/property relationships of active sites in crystals, amorphous materials and liquids

晶体、非晶材料和液体中活性位点的结构/性质关系

• 批准号: 4485-2013
• 负责人: Misra, Sushil
• 金额: $ 1.53万
• 依托单位: Concordia University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=633603
• 关键词: Structure; property; relationships; active; sites

Magnetic properties of materials of significant interest in biology, medicine, and industry will be studied byelectron magnetic resonance techniques (also referrred to as EMR/EPR/ESR) , using paramagnetic centres as probes at active sites in these materials. [This technique is based on the same principle as that of MRI (Magetic Resonance Imaging) technique used in the hospitals.] The samples to be investigated are (i) single crystals, useful as phosphors, and replacement for silicon dioxide gate dielectrics;(ii) amorphous materials in nano-structure state: Dilute magnetic semiconductors (DMS) to be used to develop spintronic devices where the charge and spin configuration can be manipulated. The oxide semiconductor DMS doped by cobalt and iron ions are among the most promising host systems. Pulsed EMR techniques [double quantum coherence (DQC), double electron-electron resonance (DEER), and electron-electron double resonance (ELDOR)] will be exploited computationally to develop the theory to measure distances in biological systems, e.g. membranes, a cutting-edge research, not possible with the X-ray technique. The objectives will be: (1) to develop materials suitable as lasers, phosphors, and materials to be used as replacement for silicon dioxide gate dielectrics. (2) to develop DMS samples as spintronic devices. (3) The bilabelled proteins project involving 2D-ELDOR and DQC/DEER techniques would lead to distance measurements in biological systems, such as membranes, a topic providing clues into blueprints of life in the human genome project. Another related project proposed to be investigated is magnetic characterization of poly-nitroxides for use as MRI and EPRI (EPR Imaging) contrast agents, magnetic rulers and quantum cubits, leading to quantum computing.

在生物、医学和工业中具有重要意义的材料的磁性将通过电子磁共振技术（也称为EMR/EPR/ESR）进行研究，使用顺磁中心作为这些材料活性位点的探针。[这项技术基于与医院使用的核磁共振成像技术相同的原理。待调查的样品是(i)单晶，可用作荧光粉，可替代二氧化硅栅极电介质；（ii）纳米结构状态下的非晶态材料：稀磁半导体（DMS）可用于开发可控制电荷和自旋构型的自旋电子器件。由钴离子和铁离子掺杂的氧化物半导体DMS是最有前途的宿主体系之一。脉冲EMR技术[双量子相干（DQC），双电子-电子共振（DEER）和电子-电子双共振（ELDOR）]将在计算上被利用来发展测量生物系统中距离的理论，例如膜，这是一项前沿研究，不可能用x射线技术。目标将是：(1)开发适合作为激光器、荧光粉的材料，以及用于替代二氧化硅栅极电介质的材料。(2)开发DMS样品作为自旋电子器件。(3)涉及2D-ELDOR和DQC/DEER技术的双标记蛋白项目将导致生物系统（如膜）的距离测量，这一主题为人类基因组计划中的生命蓝图提供了线索。另一个相关的研究项目是聚氮氧化物的磁性表征，用于MRI和EPRI （EPR成像）造影剂、磁尺和量子腕尺，从而实现量子计算。