Spin Chemistry and Radical Dynamics in Confined Environments: From Nanocrystals to Nanobubbles

化学结构、动力学和机制计划支持北卡罗来纳大学教堂山分校的马尔科姆·D·E·福布斯教授继续探索受限环境中的自由基化学和动力学。利用时间分辨和稳态磁共振技术，他将对自由基进行光谱分析，提取g因子，超精细耦合常数和精细结构分裂。从线形分析和随时间变化的光谱模型中，他将获得动态信息，如扩散系数、旋转相关时间和自旋弛豫速率。他的兴趣广泛地基于聚合物和纳米环境，如胶束和反胶束。在这项工作中，活动被扩展到纳米和微泡、纳米晶体和聚合物纳米颗粒的研究。其基本主题是控制自由基反应，不仅是在反应速度方面，而且还在有组织的集会中控制自由基的位置。这项研究的结果将对纳米医学(光动力疗法)、聚合物合成(粘合和涂层)、聚合物降解(光管)和新催化反应(乙醇化、水分解和二氧化碳还原)的开发具有潜在的实用价值。在国家科学基金会化学部化学结构、动力学和机理计划的支持下，马尔科姆·D·E·福布斯教授将在应用于动力学、结构和机理的光谱学和物理有机方法论方面追求保持核心竞争力的战略。福布斯教授的实验室为研究人员提供小分子和聚合物合成、结构分析、光化学和激光光谱、磁共振(包括微波工程)、分子和大分子动力学、表面和胶体化学以及催化方面的培训。拟议工作的更广泛影响体现在为科学教育的社区宣传、与公众的科学互动、国际合作以及解决化学领域的多样性方面的持续努力。

The Chemical Structure, Dynamics and Mechanisms Program supports Professor Malcolm D. E. Forbes at the University of North Carolina- Chapel Hill who seeks to continue his exploration of radical chemistry and dynamics in confined environments. Using time-resolved and steady-state magnetic resonance techniques, he will carry out spectroscopy on free radicals, extracting g-factors, hyperfine coupling constants, and fine structure splittings. From line shape analyses and modeling of time-dependent spectra he will obtain dynamic information such as diffusion coefficients, rotational correlation times, and spin relaxation rates. His interests are broadly based in polymers and in nano-environments such as micelles and reverse micelles. In this work, activities are expanded to the study of nano- and microbubbles, nanocrystals, and polymer nanoparticles. The underlying theme is the control of radical reactions, not just in terms of reaction rates but also the control of radical location in organized assemblies. The results of this study will have potential utility for nanomedicine (photodynamic therapy), polymer synthesis (adhesion and coatings), polymer degradation (light pipes) and the development of new catalytic reactions (glycolization, water splitting, and CO2 reduction).With the support of the Chemical Structure, Dynamics and Mechanisms Program in the Chemistry Division at the National Science Foundation, Professor Malcolm D. E. Forbes will pursue a strategy of maintaining core competencies in spectroscopy and physical organic methodology as applied to kinetics, structure and mechanism. Professor Forbes' laboratory trains researchers in small molecule and polymer synthesis, structural analysis, photochemistry and laser spectroscopy, magnetic resonance (including microwave engineering), molecular and macromolecular dynamics, surface and colloid chemistry, and catalysis. The broader impacts of the proposed work are exemplified by continuing efforts in community outreach for science education, scientific interactions with the general public, international collaborations, and by addressing diversity in the field of chemistry.