Effect of liquid properties on electrosprays from externally wetted ionic liquid ion sources

S. Castro, Carlos Larriba-Andaluz, J. Fernandez De La Mora, P. Lozano, S. Sümer, Y. Yoshida, G. Saito

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


Ionic liquid ion sources (ILISs) are externally wetted and electrochemically etched and sharpened tungsten tips used as electrospraying sources for ionic liquids in a vacuum. They have recently shown an ability to operate as emitters of pure ion beams (no drops), even with ionic liquids of moderate surface tension (γ<40 dyncm) and electrical conductivity (K<1 Sm) that had in all prior reports (all based on conventional internally fed capillary tips) always operated in the mixed ion-drop regime. The present study uses time of flight mass spectrometry to analyze full ion beams emitted from ILISs for a diversity of ionic liquids with properties in the wide range 0.26<K (Sm) <2.8, 39.3<γ (dyncm) <48.6. Remarkably, all liquids tested achieve the purely ionic regime. The main effect of reducing electrical conductivity is a reduction of the emission current from 180 to 10 nA.

Original languageEnglish (US)
Article number094310
JournalJournal of Applied Physics
Issue number9
StatePublished - 2007

Bibliographical note

Funding Information:
We are thankful to Professor Martínez-Sánchez (MIT) for many contributions to the electrospraying aspects of the problem. This work has been supported by the US AFOSR through Grant Nos. F-49620-01-1-0416 and FA9550-06-1-0104 to Yale, as well as Yale subcontracts from STTR grants to the companies Busek and Connecticut Analytical Corporation.

Copyright 2008 Elsevier B.V., All rights reserved.


Dive into the research topics of 'Effect of liquid properties on electrosprays from externally wetted ionic liquid ion sources'. Together they form a unique fingerprint.

Cite this