Generative Force of Self-Oscillating Gel
Generative Force of Self-Oscillating Gel
复制标题
自振荡凝胶的产生力
DOI：
10.1021/jp412806y
复制
发表时间：
2014
期刊：
影响因子：
3.3
通讯作者：
K. Morishima
中科院分区：
文献类型：
--
作者：
Y. Hara;H. Mayama;K. Morishima
我们成功地测量了自振荡聚合物凝胶在水溶液中的生成力，该水溶液包括Belousov-Zhabotinsky（BZ）反应的三种底物（丙二酸，溴酸钠和硝酸）在恒温下。在这项研究中，我们开发了一种装置与微力传感器用于测量小尺寸的凝胶（1毫米3）的生成力。自振荡聚合物凝胶直接将BZ反应的化学能转化为机械功。确定自振荡凝胶的生成力为972 Pa，并且在18 °C下自振荡的周期为480 s。我们证明了凝胶的生成力大约是身体肌肉生成力的百分之一。我们分析了自振荡聚合物凝胶中颜色变化的时间依赖性。由于BZ反应引起的Ru部分的氧化还原状态的循环变化，凝胶的颜色周期性地变化。产生力和颜色变化的波形的峰值几乎相同。这一结果表明生成力与凝胶中Ru催化部分的氧化数的周期性变化同步。为了理解自振荡凝胶的生成力的理论基础，我们考虑了基于凝胶的体积相变和BZ反应的双参数Oregonator模型的一般理论。
We succeeded in measuring the generative force of a self-oscillating polymer gel in an aqueous solution comprising the three substrates of the Belousov–Zhabotinsky (BZ) reaction (malonic acid, sodium bromate, and nitric acid) under constant temperature. In this study, we developed an apparatus with a microforce sensor for measuring the generative force of small-sized gels (1 mm3). The self-oscillating polymer gel directly converts the chemical energy of the BZ reaction into mechanical work. It was determined that the generative force of the self-oscillating gel was 972 Pa, and the period of self-oscillation was 480 s at 18 °C. We demonstrated that the generative force of the gel was about a hundredth the generative force of a muscle in the body. We analyzed the time dependence of the color change in the self-oscillating polymer gel. The color of the gel changed periodically owing to the cyclic change in the redox state of the Ru moiety, induced by the BZ reaction. The peaks of the waveforms of the generative force and color change were almost identical. This result showed that the generative force was synchronized with the periodical change in the oxidation number of the Ru catalytic moiety in the gel. To understand a theoretical basis for the generative force of a self-oscillating gel, we considered a general theory that is based on the volume phase transition of gel and the two-parameter Oregonator model of the BZ reaction.