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Microfluidic design rules for capillary slot-based electrospray sources

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7 Author(s)
Brinkmann, M. ; Interdisciplinary Research Institute c/o IEMN, Cité Scientifique, Avenue Poincaré BP 69, F-59652 Villeneuve d’Ascq Cedex, France ; Blossey, R. ; Arscott, S. ; Druon, C.
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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.

Published in:

Applied Physics Letters  (Volume:85 ,  Issue: 11 )

Date of Publication:

Sep 2004

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