Scanning electron microscopic imaging of surface effects in desorption and nano-desorption electrospray ionization

0363441 - ÚOCHB 2012 RIV GB eng J - Journal Article
Kaftan, Filip - Kofroňová, Olga - Benada, Oldřich - Lemr, Karel - Havlíček, Vladimír - Cvačka, Josef - Volný, Michael
Scanning electron microscopic imaging of surface effects in desorption and nano-desorption electrospray ionization.
Journal of Mass Spectrometry. Roč. 46, č. 3 (2011), s. 256-261. ISSN 1076-5174. E-ISSN 1096-9888
R&D Projects: GA ČR GPP206/10/P018; GA MŠMT LC545; GA MŠMT(CZ) ME10013
Institutional research plan: CEZ:AV0Z40550506; CEZ:AV0Z50200510
Keywords : ionization * DESI * nano-DESI * electron microscopy * mass spectrometry
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 3.268, year: 2011

Scanning electron microscopy was used to investigate rivulets that are formed on the analyzed surface during desorption electrospray ionization (DESI) experiment. Ferromagnetic nanoparticles added to the spray solvent in a form of colloid solution functioned as an additional surface probe. The existence of the rivulets was confirmed on glass and newly demonstrated on two different types of porous PTFE. The results show that in standard DESI set-up the rivulets are arranged into very regular shapes. Same rivulets were obtained in DESI experiments without high voltage on the sprayer. However, no such rivulets or any other regular patterns were found on a surface in nano-DESI (nanospray DESI without the carrier nebulizing gas) experiments. This indicates that symmetrical rivulets are created by the hydrodynamical rather than electrostatic forces. It was also demonstrated that blocking the rivulets by a simple physical barrier did not influence known surface charging effects.
Permanent Link: http://hdl.handle.net/11104/0199328