Miyakawa K, Sakamoto F, Yoshida R, Kokufuta E, Yamaguchi T
Department of Applied Physics, Fukuoka University, Fukuoka 814-0180, Japan.
Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics. 2000 Jul;62(1 Pt B):793-8. doi: 10.1103/physreve.62.793.
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.
研究了聚（N-异丙基丙烯酰胺）（PNIPA）凝胶与贝洛索夫-扎博廷斯基（BZ）反应耦合后的行为随温度和催化剂浓度的变化情况。在这类凝胶中，BZ反应中的化学振荡会引发凝胶周期性且自主的溶胀-收缩体积变化，反之，PNIPA凝胶的体积变化会影响化学波的传播。我们通过利用凝胶的热驱动体积相变，将注意力集中在机械变化对化学波的影响上。化学波的速度和频率均随温度升高而增加，并在凝胶的体积转变温度T(c)处突然下降。对波传播至关重要的HBrO2的扩散随着温度升高而受阻。HBrO2在低温区域通过凝胶网络的扩散，其解释方式与惰性分子在受限环境中的简单扩散相同。
