Natural Sciences, University of Exeter, EX4 4QF Exeter, U.K.
Astrophysics Group, University of Exeter, EX4 4QL Exeter, U.K.
J Phys Chem B. 2021 Feb 18;125(6):1667-1673. doi: 10.1021/acs.jpcb.0c11079. Epub 2021 Feb 3.
The Belousov-Zhabotinsky (BZ) reaction is an example of a homogeneous, nonequilibrium reaction used commonly as a model for the study of biological structure and morphogenesis. We report the experimental effects of temperature on spontaneously nucleated trigger waves in a quasi-two-dimensional BZ reaction-diffusion system, conducted isothermally at temperatures between 9.9 and 43.3 °C. Novel application of filter-coupled circle finding and localized pattern analysis is shown to allow the highly accurate extraction of average radial wave velocity and nucleation period. Using this, it is possible to verify a strong Arrhenius dependence of average wave velocity with temperature, which is used to find the effective activation energy of the reaction in accordance with predictions elaborated from the widely used Oregonator model of the BZ reaction. On the basis of our experimental results and existing theoretical models, the value for activation energy of the important self-catalyzed step in the Oregonator model is determined to be 86.58 ± 4.86 kJ mol, within range of previous theoretical prediction.
别洛乌索夫-扎鲍廷斯基（BZ）反应是均相非平衡反应的一个例子，常用于作为研究生物结构和形态发生的模型。我们报告了在准二维 BZ 反应-扩散系统中温度对自发成核触发波的实验影响，该系统在 9.9 至 43.3°C 的温度下等温进行。新应用的滤波器耦合圆检测和局部模式分析可以高度精确地提取平均径向波速和成核周期。利用这一点，可以验证平均波速与温度之间的强阿伦尼乌斯依赖性，这是根据从广泛使用的 BZ 反应俄勒冈州模型中得出的预测来确定反应的有效活化能。根据我们的实验结果和现有理论模型，确定俄勒冈州模型中重要的自催化步骤的活化能值为 86.58±4.86 kJ/mol，在之前的理论预测范围内。
