Intermediates and interfaces in materials and energy technologies probed by beta decayed spin spectroscopy and other physical methods

通过β衰变自旋光谱和其他物理方法探测材料和能源技术中的中间体和界面

• 批准号: RGPIN-2019-06002
• 负责人: Ghandi, Khashayar
• 金额: $ 2.11万
• 依托单位: University of Guelph
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=714836
• 关键词: Intermediates; interfaces; materials; energy; technologies

An understanding of radiation-induced processes (radiolysis) relevant to environmentally friendly health- and energy-related applications is important for the further development of these applications and for the development of new applications. Certain radiolysis processes in ionic liquids and supercritical fluids under hydrothermal conditions and at the interfaces are not understood. Although nanomaterials have been proposed as radiosensitizers in radiobiology, the ionizing radiation chemistry at the interface of liquids and nano- or microstructures is poorly understood. The NSERC Discovery Grant will help my group fill knowledge gaps in our understanding of such fluids and interfaces over the next five years. We will use state-of-the-art pump probe methods and transient beta-decay-based spectroscopy techniques, along with a new analytical chemistry technique we are developing based on Cherenkov radiation, to probe reactive intermediates and the chemical environment under irradiation and under a wide range of thermodynamic conditions, from extremely cold to high temperature and pressure conditions. We have developed many state-of-the-art setups to interface the particle beams required for our studies, and we will continue to develop more for the proposed studies in this research program. Radiation effects at the interface of water and solid material are important for radiobiology. It is also important to understand the radiation effects in the coolants of a reactor in the presence of corrosion products, as well as in environments relevant to nuclear waste storage. All of these require a thorough understanding of the radiation effects at the interface of different materials using fast time resolved methods. We will provide experimental data and tools to facilitate this understanding. A reliable set of experimental data that can be used to develop descriptions of the chemical nature of radiation, both during highly nonhomogeneous spatial non-equilibrium stages and later during homogenous stages of energy deposition by radiation, is critical. We will provide information for a wide range of reactive species created on the sub-picosecond time scale to the microsecond time scale. Such reactive species are involved as precursors of wanted and unwanted reactions not only in radiobiology and nuclear applications but also in green chemistry applications. Our results are critical as inputs for complex simulations conducted by groups that are working to create reliable predictive models for radiation processes. Our research program is challenging because it requires multifaceted investigations. It includes developing new spectroscopic and analytical methods to probe simultaneous harsh radiation and thermodynamic conditions in situ, using exotic spectroscopic techniques, using ultrafast techniques in the condensed phase, investigating species that are very short-lived, and continually developing target vessels for very different experimental conditions.

了解与环保健康和能源相关应用相关的辐射诱导过程（辐射分解）对于这些应用的进一步开发以及新应用的开发非常重要。离子液体和超临界流体在水热条件下和界面处的某些辐射分解过程尚不清楚。尽管纳米材料已被提议作为放射生物学中的放射增敏剂，但人们对液体和纳米或微米结构界面的电离辐射化学知之甚少。 NSERC 发现补助金将帮助我的团队在未来五年内填补我们对此类流体和界面理解的知识空白。我们将使用最先进的泵浦探针方法和基于瞬态β衰变的光谱技术，以及我们正在开发的基于切伦科夫辐射的新分析化学技术，来探测反应中间体和辐照下的化学环境。广泛的热力学条件，从极冷到高温和高压条件。我们已经开发了许多最先进的装置来连接我们研究所需的粒子束，并且我们将继续为本研究计划中拟议的研究开发更多装置。水和固体材料界面的辐射效应对于放射生物学很重要。了解存在腐蚀产物的反应堆冷却剂以及与核废料储存相关的环境中的辐射效应也很重要。所有这些都需要使用快速时间分辨方法彻底了解不同材料界面的辐射效应。我们将提供实验数据和工具来促进这种理解。一组可靠的实验数据至关重要，可用于开发对辐射化学性质的描述，无论是在高度非均匀的空间非平衡阶段，还是随后在辐射能量沉积的均匀阶段。我们将提供在亚皮秒时间尺度到微秒时间尺度上产生的各种活性物质的信息。这些活性物质不仅在放射生物学和核应用中而且在绿色化学应用中作为所需和不需要的反应的前体而涉及。我们的结果对于致力于为辐射过程创建可靠预测模型的小组进行的复杂模拟的输入至关重要。我们的研究计划具有挑战性，因为它需要多方面的调查。它包括开发新的光谱和分析方法来同时探测原位的严酷辐射和热力学条件，使用奇异的光谱技术，在凝聚相中使用超快技术，研究寿命非常短的物种，以及不断开发用于非常不同的实验的目标容器状况。