Microfluidic design rules for capillary slot-based electrospray sources

Martin Brinkmann, R Blossey, S Arscott, C Druon, P Tabourier, S Le Gac, C Rolando

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)
26 Downloads (Pure)


We formulate microfluidic design principles for electrospray ionization sources based on a rectangular capillary slot formed by two triangular cantilevers. Spontaneous imbibition of the test liquids into the slot by capillary action provides a robust mechanism for liquid transport from a reservoir to the cantilever tip where an electrospray is generated upon application of a voltage. The correct functioning of the source requires the liquid bridging the slot to have a negative Laplace pressure. Imbibition is controlled by the ratio of slot width to height w∕h and the intrinsic contact angles θw, θs of the liquid with the slot walls and the cantilever faces, respectively. Based on these parameters we derive a simple criterion for the complete filling of the slot.
Original languageEnglish
Pages (from-to)2140-2142
JournalApplied Physics Letters
Issue number11
Publication statusPublished - 13 Sept 2004
Externally publishedYes


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