TITLE

Microfluidic design rules for capillary slot-based electrospray sources

AUTHOR(S)
Brinkmann, M.; Blossey, R.; Arscott, S.; Druon, C.; Tabourier, P.; Le Gac, S.; Rolando, C.
PUB. DATE
September 2004
SOURCE
Applied Physics Letters;9/13/2004, Vol. 85 Issue 11, p2140
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
14434550

 

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