AI 中文总结
研究能量转换系统中电化学微流控装置，基于光谱电化学和数值模拟定量测量速度分布与通道变形，发现大通道纵横比下PDMS变形规律，考虑其在比尔 - 朗伯定律中的影响，实现准确吸光度和浓度测量。
AI 中文摘要
基于聚合物的微流控技术，使用聚二甲基硅氧烷（PDMS），是用于电化学研究的高度适应性平台，常用于众多应用。微通道中流动压力降导致的这些PDMS装置变形在文献中已有广泛记载，但在所有应用中都无法避免，尽管测量定量数据至关重要。在这项工作中，我们表明，在能量转换系统中使用的电化学微流控装置中，速度分布和通道变形可以基于光谱电化学和哈根 - 泊肃叶流动的数值模拟进行定量测量。发现PDMS变形在大通道纵横比（即接近100）的情况下会放大，在50 kPa时变形$\Delta$ h / h 0 > 100%，对于通道内部压力高于5 kPa时，变形开始变得不可忽略> 10%。最后，通过在比尔 - 朗伯定律中考虑这些通道变形，我们表明，无论通道内部压力如何，使用可见光谱都可以获得准确的吸光度和浓度测量。
英文摘要
Polymer based microfluidics, using polydimethylsiloxane (PDMS), are highly adaptable platforms for electrochemical studies commonly used for numerous applications. Deformations of these PDMS devices due to the flow pressure drop in microchannels have been widely documented in literature but cannot be prevented in all applications even though it is critical to measure quantitative data. In this work, we show that in electrochemical microfluidic devices used in energy conversion systems, the velocity profiles and channel deformations can be quantitatively measured based on spectro-electrochemistry and numerical simulations of Hagen-Poiseuille flows. PDMS deformations are found amplified in the case of large channel aspect ratios (i.e. close to 100), with deformation $Δ$ h / h 0 > 100 % at 50 kPa, and start to be non-negligible > 10 % for channel internal pressure above 5 kPa. Finally, by considering these channel deformations in the Beer-Lambert law, we show that accurate absorbance and concentration measurements can be obtained using visible spectroscopy regardless the channel internal pressure.
Journal refJournal of The Electrochemical Society, 2026, 173 (5), pp.053503
