CHEMICAL ETCHING OF EMITTER TIPS

A method of forming a capillary tube for electrospray ionisation (ESI) having at least one tip with a desired tip profile. The method includes providing a pre-finished capillary tube of substantially homogenous material. The capillary tube has a first end and an internal bore. The first end of the p...

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Bibliographische Detailangaben
Hauptverfasser:	BACHUS, KYLE JOHN JAMES, FOO, HERBERT TZE CHEUNG, STOKES, YVONNE MARIE, GIDDINGS, JOSEF ADAM, EBENDORFF-HEIDEPRIEM, HEIKE
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	BASIC ELECTRIC ELEMENTS ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS ELECTRICITY
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Beschreibung
Zusammenfassung:	A method of forming a capillary tube for electrospray ionisation (ESI) having at least one tip with a desired tip profile. The method includes providing a pre-finished capillary tube of substantially homogenous material. The capillary tube has a first end and an internal bore. The first end of the pre-finished capillary tube is wet-etched in an etchant for an etch duration. A protective fluid flows through the internal bore of the capillary tube at a flow rate during the etch duration and the flow rate and the etch duration are determined to obtain the desired tip profile below a liquid level of the etchant.