A microfabricated nebulizer for liquid vaporization in chemical analysis

Sami Franssila, Seppo Marttila, Kai Kolari, Pekka Östman, Tapio Kotiaho, Risto Kostiainen, Reijo Lehtiniemi, Carl-Magnus Fager, Jorma Manninen

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Abstract

A miniaturized nebulizer chip for vaporization of liquid samples for mass spectrometry has been designed, fabricated, and characterized for fluidic and thermal performance. Silicon/glass chip has a liquid sample channel placed centrally between symmetric nebulizer gas channels. The liquid sample is nebulized and vaporised by an integrated platinum heater. The vaporized sample exits through an etched nozzle, and is ionized by an external corona needle. The ions are analysed by a mass spectrometer. The chip has been fabricated in both anisotropically wet etched and DRIE versions in silicon, with an anodically bonded Pyrex glass cover plate. Three different fluidic inlet designs are presented, with both through-wafer and edge insert versions. The shape of the erupting gas jet has been visualized by infrared thermography by using a low-diffusivity imaging screen and high heat capacity helium as a test gas. Dimensions of the jet's thermal footprint on the screen show that the jet is very narrow and confined, and this is confirmed in mass spectrometry results. This confined jet supplies the sample to the ionization region near corona tip, enabling efficient use of very small sample amounts and submicroliter flows.
Original languageEnglish
Pages (from-to)1251-1259
JournalJournal of Microelectromechanical Systems
Volume15
Issue number5
DOIs
Publication statusPublished - 2006
MoE publication typeA1 Journal article-refereed

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Keywords

  • fluidics
  • infrared imaging
  • mass spectrometry
  • micromachining
  • silicon

Cite this

Franssila, S., Marttila, S., Kolari, K., Östman, P., Kotiaho, T., Kostiainen, R., Lehtiniemi, R., Fager, C-M., & Manninen, J. (2006). A microfabricated nebulizer for liquid vaporization in chemical analysis. Journal of Microelectromechanical Systems, 15(5), 1251-1259. https://doi.org/10.1109/JMEMS.2006.879671