Flow-Optimized Model for Gas Jet Desorption Sampling Mass Spectrometry
Flow-Optimized Model for Gas Jet Desorption Sampling Mass Spectrometry
复制标题
气体喷射解吸采样质谱的流量优化模型
DOI：
10.1021/acs.jpca.2c07999
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Larriba-Andaluz, Carlos
中科院分区：
文献类型：
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作者：
Chen, Xi;Newsome, G. Asher;Buchanan, Michael;Glasper, Jeremy;Hua, Leyan;Latif, Mohsen;Gandhi, Viraj;Li, Xintong;Larriba-Andaluz, Carlos
热气体喷射探针，包括后等离子体解吸/电离源，尚未使用计算流体动力学（CFD）模型进行研究，因为有其他环境质谱采样技术。构建了两个系统：一个加热的氮气射流探针，用于建立采样/传输实验的实际边界，以及一个计算流体动力学模型，用于通过优化流线和温度来研究从表面解吸的颗粒的轨迹。使用CFD测试的物理模型配置显示出大的损失，传输小于10%的解吸颗粒。研究了解吸探针与传输管之间以及与样品表面之间的不同距离。当系统非常接近样品时，传输得到改善，因为气体射流会产生一个低压区域，引导入口下方的流线。定位成增加样品区域中的压力的挡板提高了收集效率。拉格朗日粒子跟踪方法证实了最佳设计，导致几乎100%的传输。
Thermal gas jet probes, including post-plasma desorption/ionization sources, have not been studied using computational fluid dynamics (CFD) models, as have other ambient mass spectrometry sampling techniques. Two systems were constructed: a heated nitrogen jet probe to establish practical bounds for a sampling/transmission experiment and a CFD model to study trajectories of particles desorbed from a surface through optimization of streamlines and temperatures. The physical model configuration as tested using CFD revealed large losses, transmitting less than 10% of desorbed particles. Different distances between the desorption probe and the transport tube and from the sample surface were studied. The transmission improved when the system was very close to the sample, because the gas jet otherwise creates a region of low pressure that guides the streamlines below the inlet. A baffle positioned to increase pressure in the sample region improves collection efficiency. A Lagrangian particle tracking approach confirms the optimal design leading to a transmission of almost 100%.