Mechanisms of Surface Reactions and Materials Performance in Ionizing Radiation Environments

我的目标是提高我们的理解界面质量和电荷转移，以及它们的动力学，在系统暴露于电离辐射。连续照射产生独特的反应环境，可以改变界面处的电势，从而影响跨相边界的质量和电荷转移。通过使用一个明智的组合？-通过在紫外线照射和水溶液条件下进行界面反应，我们可以在离子液体（IL）/水体系中实现（1）尺寸均匀的过渡金属氧化物纳米颗粒、（2）均匀致密的氧化物膜和（3）胶束的定制化形成。拟议的研究旨在对这些和其他界面过程进行基本了解。为此，我将采用尖端的实验和理论方法相结合。溶解的金属离子可被水辐解产物氧化或还原。这样的氧化或还原可导致可溶性金属氢氧化物转化为不溶性物质，其冷凝并生长成均匀尺寸的氧化物纳米颗粒。我打算研究控制这种颗粒的大小、组成和形态的因素。这是一种用于纳米颗粒生产的新技术，在先进技术中具有许多潜在的应用。金属上氧化膜的基本特性取决于膜生长的条件。水的辐解可以改变金属表面的电位，并导致形成与常规氧化中所见非常不同的氧化膜。我打算研究薄膜生长的动力学和薄膜特性，目的是详细了解界面过程，并发现如何创建具有特定化学，电学和磁性的致密氧化物薄膜。IL/水体系的辐照导致胶束的快速形成。这可能是由于离子辐解产物改变了IL/水界面处的电化学势隙或充当表面活性剂以增加胶束的稳定性。我打算使用实验和分子动力学建模来理解这种系统中的化学。发现补助金将用于每年培训5名高素质的多学科科学家。

My objective is to improve our understanding of interfacial mass and charge transfer, and their kinetics, in systems exposed to ionizing radiation. Continuous irradiation creates unique reactive environments that can alter the electric potential at interfaces and thereby influence both mass and charge transfer across phase boundaries. By using a judicious combination of ?-irradiation and aqueous conditions, we can drive interfacial reactions to achieve tailored formation of (1) uniform-sized transition metal oxide nanoparticles, (2) uniform and compact oxide films, and (3) micelles in ionic liquid (IL)/water systems. The proposed research aims to develop a fundamental understanding of these and other interfacial processes. To this end, I will employ a combination of cutting-edge experimental and theoretical approaches. Dissolved metal ions can be oxidized or reduced by water radiolysis products. Such oxidation or reduction can cause a soluble metal hydroxide to be converted to an insoluble species that condenses and grows to uniform sized oxide nanoparticles. I intend to study the factors controlling the size, composition and morphology of such particles. This is a new technique for nanoparticle production that has many potential applications in advanced technologies. The fundamental characteristics of oxide films on metals depend on the conditions in which the films are grown. Radiolysis of water can change the potential at a metal surface and cause the formation of oxide films that are very different from those seen in conventional oxidation. I intend to study the kinetics of film growth and the film characteristics with the aim of understanding the interfacial processes in detail and discovering how to create compact oxide films having specific chemical, electrical, and magnetic properties. Irradiation of IL/water systems causes fast formation of micelles. This may be due to ionic radiolysis products that alter the electrochemical potential gap at the IL/water interface or that act as surfactants to increase stability of the micelles. I intend to use both experiments and molecular dynamic modelling to understand the chemistry in such systems. The Discovery Grant will be used to train 5 highly qualified multidisciplinary scientists per year.