Direct Observation of Periodic Swelling and Collapse of Polymer Chain Induced by the Belousov鈥揨habotinsky Reaction

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• 作者：Yusuke Hara ; Hiroyuki Mayama ; Yoshinori Yamaguchi ; Yoshiko Takenaka ; Ryushi Fukuda
• 刊名：Journal of Physical Chemistry B
• 出版年：2013
• 出版时间：November 21, 2013
• 年：2013
• 卷：117
• 期：46
• 页码：14351-14357
• 全文大小：361K
• 年卷期：v.117,no.46(November 21, 2013)
• ISSN：1520-5207

文摘

By utilizing a quartz crystal microbalance with dissipation (QCM-D), we directly observed the self-oscillating behavior of a polymer chain induced by the Belousov鈥揨habotinsky (BZ) reaction. We succeeded in measuring self-oscillations of the resonance frequency (螖f) and dissipation (螖D), which originate in the self-oscillating behavior of the polymer chain on a gold surface induced by the BZ reaction. We synthesized a self-oscillating polymer chain with Ru as the catalyst of the BZ reaction and a chemical adsorption site, so as to directly observe its periodic swelling and collapse on the gold surface. Distinct self-oscillation of 螖D synchronized with the self-oscillation 螖f was observed. The period of the 螖f self-oscillation was about 400 s, and the induction time was about 6.5 h. In QCM-D measurements, we found that the peaks of 螖f and 螖D oscillations did not coincide in time because the state of the Gaussian chain did not coincide with the maximum value of 螖f. Moreover, examination of the relationship between 螖f and 螖D revealed that their oscillatory waveforms were identical in frequency but differed in phase and amplitude.