New magnetic nanomaterials

新型磁性纳米材料

• 批准号: 386493-2011
• 负责人: Trudel, Simon
• 金额: $ 2.19万
• 依托单位: University of Calgary
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=572971
• 关键词: New; magnetic; nanomaterials

Magnetic materials are routinely used in daily life, from cute refrigerator magnets to computers and state-of-the art magnetic resonance imaging in hospitals. Smaller materials are advantageous, as they result in smaller, faster, and more energy efficient computers, and in the human body creep in all the nooks and crannies for better diagnostics and efficient drug delivery. We study how we can improve our daily lives by making new nanoscaled materials, and benchmarking them against current state-of-the-art materials used in information technology and biomedical analysis. Through this research program, we will prepare and study new magnetic nanomaterials with novel properties, and further our understanding of magnetism at the nanoscale. The performance of spintronic devices found in all modern computers relies on the spin polarization of their magnetic components. Materials predicted to have 100% spin polarization (eg Co2MZ [M= Fe,Cr,Mn, Z=Al,Si,Ge]), would be advantageous as nanostructures to miniaturize and speed up devices. We will design synthetic avenues to Co2MZ nanomaterials, and evaluate their properties as a function of size, composition, and morphology. Gold, a non-magnetic material in the bulk, exhibits permanent magnetism, at room temperature, when in the form of thin films or nanocrystals (~5nm or less) modified with thiol self-assembled monolayers. We will study the impact of nanocrystal size, shape, and chemical identity of the monolayer on the magnetic properties of these nanocrystals. In particular, functionalization with a photochromic switch such as a thiolated azobenzene is pursued, wherein the photochrome's state leads to large modifications of the magnetic properties. To obtain single-phase ferromagnetic, luminescent, and biocompatible nanomaterials, we will dope Al2O3, a material recently shown to be ferromagnetic when nanoscaled, with luminescent lanthanide ions. Synthetic avenues towards the controlled incorporation of the lanthanide ion into the host will be devised.

磁性材料在日常生活中经常使用，从可爱的冰箱贴到计算机和医院最先进的磁共振成像。较小的材料是有利的，因为它们可以制造出更小、更快、更节能的计算机，并且可以在人体的所有角落和缝隙中蠕动，以实现更好的诊断和有效的药物输送。 我们研究如何通过制造新的纳米级材料来改善我们的日常生活，并将其与当前信息技术和生物医学分析中使用的最先进材料进行比较。通过这个研究项目，我们将制备和研究具有新颖特性的新型磁性纳米材料，并进一步加深我们对纳米尺度磁性的理解。 所有现代计算机中的自旋电子器件的性能都依赖于其磁性组件的自旋极化。预计具有 100% 自旋极化的材料（例如 Co2MZ [M= Fe,Cr,Mn, Z=Al,Si,Ge]）作为纳米结构将有利于器件的小型化和加速。我们将设计 Co2MZ 纳米材料的合成途径，并根据尺寸、成分和形态评估其性能。 金是一种块状非磁性材料，在室温下，当以硫醇自组装单层修饰的薄膜或纳米晶体（~5nm 或更小）形式存在时，表现出永久磁性。我们将研究单层纳米晶体的尺寸、形状和化学特性对这些纳米晶体磁性能的影响。特别是，人们正在寻求用光致变色开关（例如硫醇化偶氮苯）进行功能化，其中光致变色的状态导致磁性能的大幅改变。 为了获得单相铁磁、发光和生物相容性纳米材料，我们将用发光的镧系元素离子掺杂 Al2O3（一种最近被证明在纳米尺度上具有铁磁性的材料）。将设计将镧系元素离子受控掺入主体的合成途径。