Počet záznamů: 1

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

  1. 1.
    0363441 - UOCHB-X 2012 RIV GB eng J - Článek v odborném periodiku
    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
    Grant CEP: GA ČR GPP206/10/P018; GA MŠk LC545; GA MŠk(CZ) ME10013
    Výzkumný záměr: CEZ:AV0Z40550506; CEZ:AV0Z50200510
    Klíčová slova: ionization * DESI * nano-DESI * electron microscopy * mass spectrometry
    Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
    Impakt faktor: 3.268, rok: 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.
    Trvalý link: http://hdl.handle.net/11104/0199328