Gas/solid and solid-state interactions of stimulated nanostructures

受激纳米结构的气/固和固态相互作用

• 批准号: 386021-2011
• 负责人: Braidy, Nadi
• 金额: $ 1.89万
• 依托单位: Université de Sherbrooke
• 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=572910
• 关键词: Gas; solid; state; interactions; stimulated

Interface-driven reactions are critical to a number of important applications: catalysis, filtration, batteries, detection units, fuel cells, etc. The interaction occurring between the environment and nanoparticles (NPs) defines their functionality and technological relevance. The surface interacts dynamically with gaseous species via sorption mechanisms: on the gas side of the interface, reactions kinetics is affected by the nature of the NP, which is in constant evolution as a result of reaction and diffusion occurring on its surface. The proposed research program is to investigate the stimulated interaction of nanostructures with their environment. Stimulation can be provided using the traditional way, i.e. by radiative heating, but also using microwave (MW) and magnetic induction (IND). The *expected outcomes* from understanding how nanostructures transduce heat and impart the energy to the surface reactions, include the possibility of improving surface-driven processes, such as catalysis, filtration, energy storage, etc. Ni-nanoferrites are catalytically-active materials exhibiting a strong absorption to MWs. These are also magnetic materials susceptible to IND heating, making them the ideal material for the investigation of stimulated surface activity. Obj. #1 is to develop and optimize the fabrication of Ni-nanoferrites by vaporizing a colloidal suspension using plasma-induction. Obj. #2 is to study the NPs interactions with the surrounding gases during stimulation using electron microscopy, diffraction, spectroscopy and mass-spectrometry. Sub-objective #2a focuses on the materials side of the interface (solid-state reactions and diffusion) while sub-objective #2b is concerned with the gaseous side of the interface (sorption and gas-solid reaction mechanisms). The initial fundamental investigations are intended to build the knowledge, the tools and the protocol to accomplish obj. #3: the study of other types of materials having magnetic and catalytic properties while exhibiting sensitivity to MW/IND field, such as carbides and oxides of Fe and Ni. These studies will then assist obj. #4: understanding the behaviour of Ni and Fe carbides and oxides for industry-relevant reactions.

界面驱动的反应对于许多重要应用至关重要：催化，过滤，电池，检测单元，燃料电池等。环境和纳米颗粒（NP）之间发生的相互作用定义了它们的功能和技术相关性。表面通过吸附机制与气态物质动态相互作用：在界面的气体侧，反应动力学受NP性质的影响，NP由于其表面上发生的反应和扩散而不断演变。 拟议的研究计划是研究纳米结构与环境的相互作用。刺激可以使用传统方式提供，即通过辐射加热，但也可以使用微波（MW）和磁感应（IND）。理解纳米结构如何吸收热量并将能量传递给表面反应的预期结果包括改善表面驱动过程的可能性，如催化，过滤，能量储存等。 Ni-纳米铁氧体是对MW表现出强吸收的催化活性材料。这些也是对IND加热敏感的磁性材料，使其成为研究受激表面活性的理想材料。目标#1是开发和优化镍纳米铁氧体的制造，通过使用等离子体感应蒸发胶体悬浮液。目标#2是使用电子显微镜、衍射、光谱和质谱研究在刺激期间NP与周围气体的相互作用。次级目标2a侧重于界面的材料侧（固态反应和扩散），而次级目标2b涉及界面的气体侧（吸附和气-固反应机制）。最初的基础研究旨在建立知识，工具和协议，以实现目标#3：研究具有磁性和催化性能的其他类型的材料，同时对MW/IND场表现出敏感性，例如Fe和Ni的碳化物和氧化物。这些研究将有助于目标4：了解工业相关反应中镍和铁的碳化物和氧化物的行为。