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Impact of PDMS-Based Microfluidics on Belousov–Zhabotinsky Chemical Oscillators
The Journal of Physical Chemistry B ( IF 2.8 ) Pub Date : 2020-12-14 , DOI: 10.1021/acs.jpcb.0c08422 James Sheehy 1 , Ian Hunter 1 , Maria Eleni Moustaka 1 , S. Ali Aghvami 1 , Youssef Fahmy 1 , Seth Fraden 1
The Journal of Physical Chemistry B ( IF 2.8 ) Pub Date : 2020-12-14 , DOI: 10.1021/acs.jpcb.0c08422 James Sheehy 1 , Ian Hunter 1 , Maria Eleni Moustaka 1 , S. Ali Aghvami 1 , Youssef Fahmy 1 , Seth Fraden 1
Affiliation
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Sub-nanoliter volumes of the Belousov–Zhabotinsky (BZ) reaction are sealed in microfluidic devices made from polydimethylsiloxane (PDMS). Bromine, which is a BZ reaction intermediate that participates in the inhibitory pathway of the reaction, is known to permeate into PDMS, and it has been suggested that PDMS and bromine can react ( J. Phys. Chem. A. 108, 2004, 1325−1332). We characterize the extent to which PDMS affects BZ oscillations by varying the volume of the PDMS surrounding the BZ reactors. We measure how the oscillation period varies with PDMS volume and compare with a theoretical reaction–diffusion model, concluding that bromine reacts with PDMS. We demonstrate that minimizing the amount of PDMS by making the samples as thin as possible maximizes the number of oscillations before the BZ reaction reaches equilibrium and ceases to oscillate. We also demonstrate that the deleterious effects of the PDMS–BZ interactions are somewhat mitigated by imposing constant chemical boundary conditions through using a light-sensitive catalyst, ruthenium, in combination with patterned illumination. Furthermore, we show that light can modulate the frequency and phase of the BZ oscillators contained in a PDMS matrix by 20–30%.
中文翻译：
基于PDMS的微流控技术对Belousov–Zhabotinsky化学振荡器的影响
Belousov-Zhabotinsky（BZ）反应的亚纳升以下体积密封在由聚二甲基硅氧烷（PDMS）制成的微流体装置中。溴，这是一种BZ反应中间体在反应的抑制途径参与，已知的是渗透到PDMS，并且已经表明，PDMS和溴可以反应（J.物理学。化学式阿。108，2004年，1325−1332）。我们通过改变围绕BZ反应堆的PDMS的体积来表征PDMS影响BZ振荡的程度。我们测量振荡周期如何随PDMS量变化，并与理论反应扩散模型进行比较，得出结论溴与PDMS反应。我们证明，通过使样品尽可能薄来最小化PDMS的量，可以使BZ反应达到平衡并停止振荡之前的振荡次数最大。我们还证明，通过使用光敏催化剂钌和图案化照明相结合施加恒定的化学边界条件，可以一定程度上减轻PDMS-BZ相互作用的有害影响。此外，
更新日期：2020-12-24
中文翻译：
基于PDMS的微流控技术对Belousov–Zhabotinsky化学振荡器的影响
Belousov-Zhabotinsky（BZ）反应的亚纳升以下体积密封在由聚二甲基硅氧烷（PDMS）制成的微流体装置中。溴，这是一种BZ反应中间体在反应的抑制途径参与，已知的是渗透到PDMS，并且已经表明，PDMS和溴可以反应（J.物理学。化学式阿。108，2004年，1325−1332）。我们通过改变围绕BZ反应堆的PDMS的体积来表征PDMS影响BZ振荡的程度。我们测量振荡周期如何随PDMS量变化，并与理论反应扩散模型进行比较，得出结论溴与PDMS反应。我们证明，通过使样品尽可能薄来最小化PDMS的量，可以使BZ反应达到平衡并停止振荡之前的振荡次数最大。我们还证明，通过使用光敏催化剂钌和图案化照明相结合施加恒定的化学边界条件，可以一定程度上减轻PDMS-BZ相互作用的有害影响。此外，
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