Lawson Hugh Shearer, Holló Gábor, Horvath Robert, Kitahata Hiroyuki, Lagzi István
Department of Physics, Budapest University of Technology and Economics, Budafoki út 8, H-1111 Budapest, Hungary.
MTA-BME Condensed Matter Research Group, Budapest University of Technology and Economics, Budafoki út 8, H-1111 Budapest, Hungary.
J Phys Chem Lett. 2020 Apr 16;11(8):3014-3019. doi: 10.1021/acs.jpclett.0c00586. Epub 2020 Apr 2.
Resonance, beats, and synchronization are general and fundamental phenomena in physics. Their existence and their in-depth understanding in physical systems have led to several applications and technological developments shaping our world today. Here we show the existence of chemical resonance, chemical beats, and frequency locking phenomena in periodically forced pH oscillatory systems (sulfite-hydrogen peroxide and sulfite-formaldehyde-gluconolactone pH oscillatory systems). Periodic forcing was realized by a superimposed sinusoidal modulation on the inflow rates of the reagents in the continuous-flow stirred tank reactor. The dependence of the time period of beats follows the relation known from classical physics for forced physical oscillators. Our developed numerical model describes qualitatively the resonance and beat phenomena experimentally revealed. Application of periodic forcing in autonomously oscillating systems can provide new types of oscillators with a controllable frequency and new insight into controlling irregular chemical oscillation regimes.
共振、拍频和同步是物理学中普遍且基本的现象。它们在物理系统中的存在以及对其的深入理解催生了多种应用和技术发展，塑造了我们如今的世界。在此，我们展示了在周期性强迫pH振荡系统（亚硫酸盐 - 过氧化氢和亚硫酸盐 - 甲醛 - 葡萄糖酸内酯pH振荡系统）中化学共振、化学拍频和频率锁定现象的存在。通过在连续流动搅拌釜反应器中对试剂流入速率进行叠加正弦调制来实现周期性强迫。拍频周期的依赖性遵循经典物理学中强迫物理振荡器的已知关系。我们开发的数值模型定性地描述了实验揭示的共振和拍频现象。在自主振荡系统中应用周期性强迫可以提供具有可控频率的新型振荡器，并为控制不规则化学振荡状态提供新的见解。
