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首页> 外文期刊>Journal of power sources >In situ confocal-Raman measurement of water and methanol concentration profiles in Nafion~® membrane under cross-transport conditions
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In situ confocal-Raman measurement of water and methanol concentration profiles in Nafion~® membrane under cross-transport conditions

机译：交叉运输条件下Nafion〜®膜中水和甲醇浓度分布的原位共聚焦拉曼测量

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摘要

The local concentration gradients of water and methanol within a Nafion~® membrane are measured with a new microfluidic cell specially designed for depth measurement by confocal micro-Raman spectroscopy. The experimental concentration profiles of solvents, obtained in situ under cross-transport conditions, are fitted taking into account the contribution of the experimental set-up to the Raman response. This method allows to measure the concentration ratios of methanol and water at the solution-membrane interface as well as the real concentration gradients of these solvents within the membrane medium. These parameters are critical for a better understanding of membrane transport properties and cannot be directly measured by other techniques. Indeed, results here reported show that internal gradients differ from those that can be estimated from methods measuring external concentrations.
机译：使用专门设计用于通过共聚焦显微拉曼光谱法进行深度测量的新型微流控池，对Nafion〜®膜中水和甲醇的局部浓度梯度进行测量。考虑交叉实验条件下原位获得的溶剂的实验浓度分布，考虑了实验装置对拉曼响应的影响。该方法可以测量溶液-膜界面处甲醇和水的浓度比，以及膜介质中这些溶剂的实际浓度梯度。这些参数对于更好地了解膜的运输特性至关重要，无法通过其他技术直接测量。的确，这里报道的结果表明内部梯度不同于可以通过测量外部浓度的方法估算出的内部梯度。

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