Kinetics of Anion Exchange in Nanodimensional Layered Metal Hydroxides

在这项由化学系实验物理化学计划支持的项目中，马奎特大学的J.M.Hossenlopp教授将研究层状金属氢氧化物的阴离子交换动力学，层状金属氢氧化物是由带有可取代阴离子的金属氢氧化物层组成的纳米维层间走廊。这些材料的多功能性使化学家能够通过改变氢氧化层中金属的识别性和相对化学计量比和/或层间阴离子的识别性来轻松地改变其物理和化学性质，从而使它们在许多应用中都有用。该项目的主要目标是全面了解羟基复盐、HDSS和其他密切相关化合物的基本阴离子交换反应。在HDSS与不同金属离子组成的反应中，将探索阴离子大小、形状和化学官能度的影响。将确定阴离子交换动力学的温度依赖性，并将采用无模型和基于模型的方法来分析数据，为表征动力学提供了一种严格的方法。此外，还将开发光谱方法对这些反应进行现场研究。这些实验中获得的数据将为确定HDSS和其他结构相似材料的阴离子交换反应的关键特征提供一个系统的框架。这些结构修改对于更广泛的影响也是至关重要的，开发这些材料在社会影响应用方面的潜力。这里所获得的基本见解将被用来为这些材料的未来发展提供信息，这些材料用于聚合物阻燃添加剂配方和用于检测环境监测中感兴趣的水阴离子的化学传感器的开发。在这些应用中，调整化学和物理特性的能力至关重要。该研究计划还将支持广泛的教育活动，包括培训纳米材料科学方面的研究生和本科生，并开发供Marquette使用的本科生实验室课程材料。此外，该项目将包括为来自代表不足的群体和/或经济困难背景的高中生开发制作和表征纳米材料的实践经验，以鼓励从事科学事业

In this project supported by the Experimental Physical Chemistry Program of the Chemistry Division, Prof. J.M. Hossenlopp of Marquette University will investigate the anion exchange kinetics of layered metal hydroxides that are comprised of metal hydroxide layers with replaceable anions in the nanodimensional inter-layer galleries. The versatility of these materials enables chemists to easily alter the physical and chemical properties via changes in the identity and relative stoichiometry of the metals in the hydroxide layer and/or the identity of the interlayer anions, thus making them useful for many applications. The primary goal of this project is to develop a comprehensive view of the fundamental anion exchange reactions of hydroxy double salts, HDSs, and other closely related compounds. The effects of anion size, shape, and chemical functionality will be explored in reactions of HDSs with different metal ion compositions. The temperature-dependence of the anion exchange kinetics will be determined and model-free and model-based approaches will be implemented for analysis of the data, providing a rigorous approach for characterizing the kinetics. In addition, spectroscopic methods will be developed for in-situ studies of these reactions. The data obtained in these experiments will provide a systematic framework for identifying the key features in anion exchange reactions of HDSs and other structurally-similar materials. These structural modifications are also critical for the broader impact exploiting the potential of these materials for applications of societal impact. The fundamental insight obtained here will be used to inform future development of these materials for use in polymer fire retardant additive formulations and in chemical sensor development for detecting aqueous anions of interest in environmental monitoring. In these applications, the ability to tune chemical and physical properties is critical. The research program will also support a broad range of educational activities including the training of graduate and undergraduate research students in nanomaterials science and development of undergraduate laboratory curricular materials for use at Marquette. In addition, the project will include the development of hands-on experiences in making and characterizing nanomaterials for high school students from underrepresented groups and/or economically disadvantaged backgrounds in order to encourage careers in science