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Choosing the Right Tip
STEP 3: Selecting the right coating style
In order to perform electrospray a means of electrical
contact must be supplied. Contact is either established through a
conductive coating applied to the emitter or directly to the mobile
phase through a junction contact. Each style of emitter is available
with a multi-layer conductive coating (U.S. pat. 5,788,166) to establish
contact with the spray solvent at the end of the tip. Emitters are
also available uncoated for junction contact inside a metal
union. Some styles of emitters are also available with our distal
coating that provides a means to establish in-union electrical contact
without having to resort to stainless steel fittings. The distal coating was
specifically designed to work with our growing line of PicoTip®adapters.
Junction Contact with Distal Coated Tips (D)
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The electrical contact is provided
to the outside of the emitter, which has a conductive coating on the
distal end. The voltage contacts the mobile phase through the gap
between the emitter and the transfer tubing. PicoTips with a distal
coating have -D- in their stock numbers. The union holding the emitter
is made from non-conductive material, such as PEEK™.
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Tip Contact With Standard Coated Tips (CE)
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The electrical contact is made to the
outside of the tip. The emitter has a conductive coating to the tip
where the voltage contacts the mobile phase. PicoTips with a standard
coating have -CE- in their stock numbers. The union holding the emitter
is made from non-conducting material, such as PEEK™.
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Junction Contact With Uncoated Tips (N)
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The electrical contact is made to the union holding
the emitter. The voltage passes to the mobile phase in the gap between
the emitter and the transfer line. PicoTips that are uncoated have -N-
in their stock numbers. In one configuration the union holding the
emitter is made from a conducting metal. In another configuration the
voltage is applied through a wire electrode inside a PEEK™ MicroTee.
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For more technical information about Online PicoTip emitters:
SilicaTip | TaperTip
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