Okano Hideyuki, Kitahata Hiroyuki, Akai Daisuke
International Innovation Center, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan.
J Phys Chem A. 2009 Apr 2;113(13):3061-7. doi: 10.1021/jp8045565.
The anomalous chemical wave propagation of an unstirred Belousov-Zhabotinsky (BZ) reaction was observed under exposure to a gradient static magnetic field (SMF). The gradient SMF effect on the BZ reaction was investigated by increasing the thickness of the BZ medium up to 0.9 mm under the conditions of the extremely reduced water evaporation and surface tension caused by air-water interfaces. 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 x its gradient (a magnetic force parameter) are 0.206 T, 37 T m(-1), and 4 T(2) m(-1). The experiments demonstrate that the more increased thickness of the BZ medium induces the larger anomalous wave propagation toward the peak magnetic gradient line but not toward the peak magnetic force product line. The anomalies were significantly enhanced by the increased thickness of the BZ medium at the shorter distance from the maximum magnetic gradient point. The possible mechanism of SMF-induced anomalous wave propagation related to the BZ medium thickness is that the micro-magneto-convection-induced flow of the paramagnetic iron ion complexes at the wavefronts can be accelerated by increases in both the spatial magnetic gradient and the volumetric depth of the diffusion layer.
在暴露于梯度静磁场（SMF）的情况下，观察到了未搅拌的贝洛索夫-扎博廷斯基（BZ）反应的异常化学波传播。在空气-水界面导致的水蒸发和表面张力极大降低的条件下，通过将BZ介质的厚度增加到0.9毫米，研究了梯度SMF对BZ反应的影响。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0.206 T、37 T m(-1)和4 T(2) m(-1)。实验表明，BZ介质厚度增加得越多，异常波向峰值磁梯度线方向传播得越远，但不是向峰值磁力乘积线方向传播。在离最大磁梯度点较短距离处，BZ介质厚度的增加显著增强了异常现象。与BZ介质厚度相关的SMF诱导异常波传播的可能机制是，波前顺磁性铁离子络合物的微磁对流诱导流动可通过空间磁梯度和扩散层体积深度的增加而加速。
