Okano Hideyuki, Kitahata Hiroyuki, Akai Daisuke, Tomita Naohide
International Innovation Center, Kyoto University, Kyoto, Japan.
Bioelectromagnetics. 2008 Dec;29(8):598-604. doi: 10.1002/bem.20420.
It is believed that static magnetic fields (SMF) cannot affect the pattern formation of the Belousov-Zhabotinsky (BZ) reaction, which has been frequently studied as a simplified experimental model of a nonequilibrium open system, because SMF produces no induced current and the magnetic force of SMF far below 1 T is too low to expect the effects on electrons in the BZ reaction. In the present study, we examined whether the velocity of chemical waves in the unstirred BZ reaction can be affected by a moderate-intensity SMF exposure depending on the spatial magnetic gradient. The SMF was generated by a parallel pair of attracting rectangular NdFeB magnets positioned opposite each other. The respective maximum values of magnetic flux density (B(max)), magnetic flux gradient (G(max)), and the magnetic force product of the magnetic flux density its gradient (a magnetic force parameter) were 206 mT, 37 mT/mm, and 3,000 mT(2)/mm. The ferroin-catalyzed BZ medium was exposed to the SMF for up to 16 min at 25 degrees C. The experiments demonstrated that the wave velocity was significantly accelerated primarily by the magnetic gradient. The propagation of the fastest wave front indicated a sigmoid increase along the peak magnetic gradient line, but not along the peak magnetic force product line. The underlying mechanisms of the SMF effects on the anomalous wave propagation could be attributed primarily to the increased concentration gradient of the paramagnetic iron ion complexes at the chemical wave fronts induced by the magnetic gradient.
人们认为静磁场（SMF）不会影响贝洛索夫-扎博廷斯基（BZ）反应的图案形成，BZ反应作为非平衡开放系统的简化实验模型常被研究，因为静磁场不会产生感应电流，且强度远低于1 T的静磁场磁力过低，难以预期对BZ反应中电子的影响。在本研究中，我们研究了在未搅拌的BZ反应中，化学波的速度是否会受到中等强度静磁场暴露的影响，该影响取决于空间磁梯度。静磁场由一对相互对置的平行吸引矩形钕铁硼磁体产生。磁通密度（B(max)）、磁通梯度（G(max)）以及磁通密度与其梯度的磁力乘积（一个磁力参数）的各自最大值分别为206 mT、37 mT/mm和3,000 mT(2)/mm。亚铁离子催化的BZ介质在25℃下暴露于静磁场中长达16分钟。实验表明，波速主要因磁梯度而显著加快。最快波前的传播沿峰值磁梯度线呈S形增加，但沿峰值磁力乘积线则不然。静磁场对异常波传播影响的潜在机制可能主要归因于磁梯度在化学波前诱导的顺磁性铁离子络合物浓度梯度增加。
