Chemical waves in self-oscillating gels
Chemical waves in self-oscillating gels
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DOI：
10.1103/physreve.62.793
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发表时间：
2000-07-01
影响因子：
2.4
通讯作者：
Yamaguchi, T
中科院分区：
文献类型：
--
作者：
Miyakawa, K;Sakamoto, F;Yamaguchi, T
研究了聚N-异丙基丙烯酰胺（PNIPA）凝胶与Belousov-Zhabotinsky（BZ）反应耦合的行为与温度和催化剂浓度的关系。在这种类型的凝胶中，BZ反应中的化学振荡引起凝胶的周期性和自主的溶胀-收缩体积变化，并且相反地，PNIPA凝胶的体积变化影响化学波的传播。我们的注意力集中在利用凝胶的热驱动体积相变的化学波的机械变化的影响。化学波的速度和频率都随温度的升高而增加，并在凝胶的体积转变温度Tc处突然下降。的HBrO 2，这是必不可少的波传播的扩散，阻碍了随着温度的升高。HBrO 2通过凝胶网络在低温区的扩散被解释为一个简单的非活性分子通过一个受限制的环境扩散相同的方式。
The behaviors of a poly(N-isopropyl acrylamide) (PNIPA) gel coupled with the Belousov-Zhabotinsky (BZ) reaction has been investigated as a function of temperature and catalyst concentration. In this type of gel, the chemical oscillation in the BZ reaction induces periodic and autonomous swelling-shrinking volume changes of the gel, and conversely a volume change of the PNIPA gel affects the propagation of the chemical wave. Our attention was focused on the effects of mechanical changes on the chemical wave by utilizing the thermally driven volume phase transition of the gel. Both the velocity and the frequency of the chemical wave increased with increasing temperature, and abruptly decreased at the volume transition temperature of the gel, T-c. The diffusion of HBrO2, which is essential for wave propagation, was hindered with increasing temperature. The diffusion of HBrO2 through the gel network in the low temperature region was explained in the same way as a simple diffusion of inactive molecules through a restricted environment.