Silicon microfabrication technology was employed in the generation of a cavity in the form of a truncated inverted pyramid with very smooth sidewalls and a silicon dioxide UV transparent optical window at the bottom. This can be used as a micro-cuvette for testing of fluids. 100nl fluid volumes can be tested using this platform by ultraviolet absorbance spectroscopy employing a deuterium lamp and an UV spectrometer. Mixtures of commercially sourced diesel with ethanol, and diesel with kerosene were tested in this work. Two zones of interest were identified in the absorption spectrum of diesel. For a 0 to 10% diesel in ethanol mixture, a clear shift of the UV absorption edge from 297nm to 336nm was observed. For the diesel in kerosene mixture a linear shift of the absorption edge from 335nm to 365nm was observed for the entire composition range. Our results indicate that a single wavelength source and detector at 345nm is sufficient to determine the diesel in kerosene composition using this micro-cuvette, which would be very useful in detection of adulteration in fuels. [2020-0344]

中文翻译：

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使用紫外吸收光谱法测定硅微池中的100纳米升燃料混合物的成分

硅微细加工技术以截顶倒金字塔的形式用于腔体的生产，该倒金字塔具有非常光滑的侧壁和底部的二氧化硅紫外线透明光学窗口。可以用作测试液体的微型比色皿。可以使用该平台通过使用氘灯和紫外线光谱仪的紫外线吸收光谱法测试100nl液体体积。在这项工作中，对商用柴油与乙醇的混合物以及柴油与煤油的混合物进行了测试。在柴油的吸收光谱中发现了两个感兴趣的区域。对于乙醇混合物中0％至10％的柴油，观察到UV吸收边缘从297nm明显转移到336nm。对于煤油中的柴油混合物，在整个组成范围内观察到吸收边从335nm到365nm的线性变化。我们的结果表明，使用此微比色皿，单个波长源和345nm检测器足以确定煤油组合物中的柴油，这对于检测燃料中的掺假非常有用。[2020-0344]