Noël Florian, Trocquet Claire, Serra Christophe A, Le Calvé Stéphane
ICPEES UMR 7515, Université de Strasbourg/CNRS, F-67000 Strasbourg, France.
In'Air Solutions, 25 Rue Becquerel, F-67087 Strasbourg, France.
Micromachines (Basel). 2021 Jun 18;12(6):715. doi: 10.3390/mi12060715.
In this work, a novel generator of gas mixtures previously numerically investigated and based on axial gas pulses coupled to a micromixer has been conceived, manufactured, and validated. Standard gaseous pollutant mixtures and pure nitrogen or pure air were introduced in a microdevice designed to generate alternating axial gas pulses which were downstream homogenized by means of a multi-stage modular micromixer. The dilution, and therefore the final pollutant concentration, was controlled by two parameters: the ratio between the times of each of the two gas pulses and the partial pressure of the pollutant(s) mixture added to the device. The gas mixture generator was coupled to an analyzer to monitor the concentration of aromatic pollutants. The response time was optimized to be lower than 2 min in accordance with the analytical instrument. The quantity of pollutants measured at the micromixer's outlet increased linearly with the expected gas concentration of 3.7-100 ppb generated by this novel microfluidic generator and fitted perfectly with those obtained by a reference gas dilution bench. At 5 ppb, the precision on the concentration generated is close to that obtained with the conventional gas mixing bench, i.e., around 10%.
在这项工作中，一种新型的气体混合物发生器已被构思、制造并验证，该发生器先前已进行过数值研究，基于与微混合器耦合的轴向气体脉冲。标准气态污染物混合物以及纯氮气或纯空气被引入到一个微设备中，该微设备设计用于产生交替的轴向气体脉冲，这些脉冲在下游通过多级模块化微混合器实现均匀化。稀释以及最终的污染物浓度由两个参数控制：两个气体脉冲各自的时间之比以及添加到设备中的污染物混合物的分压。气体混合物发生器与一台分析仪相连，以监测芳香族污染物的浓度。响应时间根据分析仪器进行了优化，使其低于2分钟。在该新型微流体发生器产生的预期气体浓度为3.7 - 100 ppb的情况下，在微混合器出口处测得的污染物量与预期值呈线性增加，并且与通过参考气体稀释台获得的值完美拟合。在5 ppb时，所产生浓度的精度接近传统气体混合台所获得的精度，即约为10%。
