Method and apparatus to produce ions and nanodrops from...

H - Electricity – 01 – J

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H01J 49/04 (2006.01) B64G 1/40 (2006.01) H05H 1/24 (2006.01)

Patent

CA 2462854

An apparatus (18) for forming a stable electrospray of a volatile liquid in a low pressure region (8) includes multi-component capillary jets (34, 35); a plurality of electrodes or grids (20, 23) including at least one emitter electrode (7); power supplies (10, 23) for applying a difference of electrical potential between at least two of electrodes (7, 20) for forming a Taylor cone jet; a several reservoirs (30, 37) for applying several liquids to the emitter electrode (7); and a pump (27) for maintaining a low pressure region (8) around the emitter electrode (7).

L'invention concerne un procédé permettant de former une électronébulisation stable de liquide volatil à pression réduite par limitation de sa tendance à l'évaporation. Selon un premier aspect, des jets capillaires à composants multiples sont produits, ces jets contenant une fine couche de liquide à faible volatilité - ce liquide n'étant pas nécessairement un bon conducteur - qui entoure un noyau formé par un liquide volatil et conducteur, tel que l'eau, de sorte à réduire au minimum l'exposition directe du liquide volatil à la zone de basse pression. Selon un deuxième aspect, le diamètre du ménisque d'un cône de Taylor est réduit à un diamètre critique en dessous duquel le refroidissement par évaporation n'entraîne pas la congélation du cône.

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