Nonlinear instabilities in photochemical reactions

该计划旨在探索光化学反应中的非线性行为，并随后利用非线性动力学作为工具来深入了解在这些复杂的光化学反应中发生的基本过程。自然界中的光化学反应无处不在，从阳光对汽车尾气的作用到植物的光合作用。许多光化学过程涉及链式反应，这可能会导致非线性不稳定性的发生，如化学振荡和传播波。这项探索性研究有望发现一系列新的光中介化学振荡器，其中光发挥更关键的作用，以独家控制关键中间体的生产。这个项目将极大地提高我们对微扰非线性动力学的理解。此外，还将发展利用非线性理论来深入了解1，4-苯二酚和多巴胺等环状化合物的光化学反应的方法。这些方法也应适用于其他光化学过程。我们将在间歇式反应器和连续流动搅拌釜式反应器中对1，4-苯醌-溴酸盐反应的光控非线性行为进行探索。反应后将同时进行铂和溴离子选择电极，与汞|Hg2SO4|K2SO4参比电极。辐照将使用卤素光源，配备两根分叉光纤。采用UV/Vis光谱分析方法分析中间物种的演化过程。为了破译潜在的反应机理，将对反应混合物进行进一步的红外光谱、核磁共振和质谱分析。

This program aims to explore nonlinear behavior in photochemical reactions and to subsequently utilize nonlinear dynamics as a tool to gain insights into fundamental processes occurring in these complicated photochemical reactions. Photochemical reactions are ubiquitous in nature, ranging from the action of sunlight on car exhaust fumes to photosynthesis by plants. Many photochemical processes involve chain reactions, which can potentially result in the occurrence of nonlinear instabilities such as chemical oscillations and propagating waves. This exploratory research is expected to discover a series of new photo-mediated chemical oscillators, in which light plays a more critical role to exclusively control the production of key intermediate reagents. This program will significantly advance our understanding of perturbed nonlinear dynamics. In addition, methods of using nonlinear theory to gain insight into photochemical reactions of cyclic compounds such as 1,4-benzoquinone and dopamine will be developed here. These methods shall be applicable to other photochemical processes as well. Our exploration on light-controlled nonlinear behavior in the 1,4-benzoquinone-bromate reaction will be conducted in a batch reactor and in a continuously flow stirred tank reactor. Reactions will be followed simultaneously by a Pt and a bromide ion selective electrode, coupled with a Hg|Hg2SO4|K2SO4 reference electrode. Irradiation will be implemented with a halogen light source, equipped with two bifurcated optic fibers. UV/Vis spectroscopic method will be employed to analyze the evolution of intermediate species. To decipher the underlying reaction mechanisms, the reaction mixture will be further analyzed by Infrared Spectroscopy, NMR, and Mass Spectrometry.