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

✍ Scribed by Filip Kaftan; Olga Kofroňová; Oldřich Benada; Karel Lemr; Vladimír Havlíček; Josef Cvačka; Michael Volný

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
281 KB
Volume
46
Category
Article
ISSN
1076-5174

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✦ Synopsis

Abstract

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 polytetrafluoroethylene (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. Copyright © 2011 John Wiley & Sons, Ltd.

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