In-phase synchronization of chemical and mechanical oscillations in self-oscillating gels
In-phase synchronization of chemical and mechanical oscillations in self-oscillating gels
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DOI：
10.1021/jp0011600
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发表时间：
2000-08-17
影响因子：
2.9
通讯作者：
Kokufuta, E
中科院分区：
文献类型：
--
作者：
Yoshida, R;Tanaka, M;Kokufuta, E
以三（2，2 ′-联吡啶）钌（Ru（bpy）（3））为催化剂，通过N-异丙基丙烯酰胺（NIPAAm）的共聚反应，制备了一种具有自发周期性溶胀-去溶胀振荡的新型凝胶.研究发现，微型立方聚（NIPAAm-co-Ru（bpy）（3））凝胶的溶胀-去溶胀循环与化学振荡同步，没有相位差。的溶胀-去溶胀的变化，以及氧化还原的变化的振荡配置文件进行了研究，作为一个功能的底物浓度通过使用图像处理方法。化学振荡的周期和振幅都随底物浓度的变化而变化。这种变化导致溶胀-去溶胀振荡的变化：即，溶胀-去溶胀的幅度随着氧化还原变化的周期和幅度的增加而增加。在同步化过程中，还提出了从机械振荡到化学振荡的反馈机制。凝胶尺寸随时间的变化。初始尺寸的20%作为最大值。凝胶的溶胀-去溶胀幅度可通过改变底物的初始浓度或凝胶中固定化Ru（bpy）3催化剂的含量来控制。
A novel gel which undergoes an autonomic and periodical swelling-deswelling oscillation has been prepared by the copolymerization of N-isopropylacrylamide (NIPAAm) with ruthenium tris(2,2'-bipyridine) (Ru(bpy)(3)) as a catalyst for the Belousov-Zhabotinsky (BZ) reaction, which is known as an oscillating reaction accompanying a rhythmical change in the redox potential. The swelling-deswelling cycle of a miniature cubic poly(NIPAAm-co-Ru(bpy)(3)) gel was found to be synchronized with the chemical oscillation without a phase difference. The oscillating profiles of the swelling-deswelling changes as well as the redox changes were studied as a function of the substrate concentrations by using an image-processing method. Both period and amplitude of chemical oscillation varied depending on the substrate concentration. This variation led to a change in the swelling-deswelling oscillation: i.e., the swelling-deswelling amplitude increased with an increase in the period and amplitude of the redox changes. In the synchronization process, a feedback mechanism from mechanical to chemical oscillation was also suggested. The change in gel size with ca. 20% to the initial size was obtained as the maximum value. The swelling-deswelling amplitude of the gel is controllable by changing the initial concentration of substrates or the content of immobilized Ru(bpy)3 catalyst within the gel.