Correlating droplet size with temperature changes in electrospray source by optical methods.

Abstract : We investigated how the temperature and size of charged droplets are affected by the electrospray ionization (ESI) process, using in situ measurements involving laser-induced fluorescence and Mie scattering on a thermal gradient focusing ESI source. Rhodamine dyes were employed as temperature indicators using ratiometric intensity based fluorescence techniques. The results were compared to lifetime-based techniques using tris(2,2'-bipyridyl)dichlororuthenium(II) hexahydrate, [Ru(bpy) 3 ] 2+). Both methods gave similar profiles. Nevertheless, the precision and sensitivity were higher for lifetime-based techniques in comparison to intensity-based techniques. Global warming (with ∆T ~10 K) of the ESI plume is reported while the size of the droplet decreases along the plume. The global warming indicates that the conductive thermal transfer (between the super-heated sheath gas and the solvent) is predominant and stronger than the cooling effect due to the evaporation of the droplets, and is well reproduced by a diffusion-controlled evaporation model. Thermal gradient focusing ESI sources therefore appear efficient sources for evaporating large amounts of solvent, along with an increase in temperature.
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Antonin Soleilhac, Xavier Dagany, Philippe Dugourd, Marion Girod, Rodolphe Antoine. Correlating droplet size with temperature changes in electrospray source by optical methods.. Analytical Chemistry, American Chemical Society, 2015, 87 (16), pp.8210-8217. ⟨10.1021/acs.analchem.5b00976⟩. ⟨hal-01344760⟩



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