Pneumatically assisted electrospray device with alternating...

Details Pneumatically assisted electrospray device with alternating... Pneumatically assisted electrospray device with alternating...

H - Electricity

01

J

H01J 49/04 (2006.01) G01N 30/72 (2006.01)

Patent

CA 2345430

An apparatus for producing gas-phase ions from a sample compound in a carrier liquid. The electrospray needle (or capillary) (100) of the present invention includes a central metal tube (102) which carries the liquid containing the sample compound. The central tube (102) is surrounded by a plurality of tubes (104) which transport a nebulizing gas. The nebulizing gas tubes are placed symmetrically around the outside of the liquid containing tube. The nebulizer of the present invention produces a symmetric, non-annular gas flow which has variations in pressure around the circumference of the central tube. The pressure variations of the nebulizing gas flow produce additional shear forces on the liquid emerging from the central tube. This assists in forming a uniform electrospray of droplets from the liquid at lower nebulizing gas flow rates, thereby reducing the disadvantageous effects of the higher gas flow rates used in the art. The symmetric arrangement of the nebulizing gas tube provides support for the central sample carrying tube, thereby reducing the alignment problems found in prior art devices, and enhancing uniformity of the electrospray.

L'invention porte sur un appareil qui produit des ions en phase gazeuse à partir d'un composé de prélèvement placé dans un liquide support. L'aiguille d'électronébulisation (ou capillaire) (100) de l'invention inclut un tube métallique central (102) dans lequel est placé le liquide contenant le composé de prélèvement. Ce tube central (102) est entouré d'une pluralité de tubes (104) transportant un gaz de nébulisation. Les tubes de gaz de nébulisation sont disposés en symétrie autour et à l'extérieur du tube contenant le liquide. Le nébulisateur de la présente invention produit un écoulement gazeux symétrique, non annulaire, à pression variable, autour de la circonférence du tube central. Les écarts de pression de l'écoulement du gaz de nébulisation exercent des forces de cisaillement supplémentaires sur le liquide émergeant du tube central. Cela contribue à former une électronébulisation homogène de gouttelettes provenant du liquide à des débits gazeux de nébulisation plus faibles, ce qui réduit les inconvénients des débits gazeux plus élevés observés dans la technique antérieure. La disposition symétrique du tube à gaz de nébulisation apporte un appui au tube central contenant le prélèvement, ce qui diminue les problèmes d'alignement rencontrés avec les dispositifs classiques, et améliore l'homogénéité de l'électronébulisation.

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