Seppo Marttila
Helsinki University of Technology
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Publication
Featured researches published by Seppo Marttila.
IEEE\/ASME Journal of Microelectromechanical Systems | 2006
Sami Franssila; Seppo Marttila; Kai Kolari; Pekka Östman; Tapio Kotiaho; Risto Kostiainen; Reijo Lehtiniemi; Carl-Magnus Fager; Jorma Manninen
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 jets 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.1591
Analytical Chemistry | 2004
Tiina J. Kauppila; Pekka Östman; Seppo Marttila; Raimo A. Ketola; Tapio Kotiaho; Sami Franssila; Risto Kostiainen
Sensors and Actuators B-chemical | 2006
Ville Saarela; Sami Franssila; Santeri Tuomikoski; Seppo Marttila; Pekka Östman; Tiina Sikanen; Tapio Kotiaho; Risto Kostiainen
Analytical Chemistry | 2004
Pekka Östman; Seppo Marttila; Tapio Kotiaho; Sami Franssila; Risto Kostiainen
Archive | 2004
Risto Kostiainen; Samuli Franssila; Tapio Kotiaho; Seppo Marttila
Analytical Chemistry | 2004
Pekka Östman; Seppo Marttila; Tapio Kotiaho; Sami Franssila; Risto Kostiainen
Archive | 2005
Sami Franssila; Kestutis Grigoras; Seppo Marttila; Reijo Lehtiniemi; Carl-Magnus Fager; Jorma Manninen
Proceedings MicroTAS | 2004
Pekka Östman; Seppo Marttila; S. Kotiaho; Sami Franssila; Risto Kostiainen
Proceedings MicroTAS | 2004
Tiina J. Kauppila; Pekka Östman; Seppo Marttila; Raimo A. Ketola; T. Kotiaho; Sami Franssila; Risto Kostiainen
Archive | 2004
Sami Franssila; Pekka Östman; Seppo Marttila; T. Kotiaho; Risto Kostiainen