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Bars with (*) may
require high speed access.
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This section provides a brief compilation of various
non-contact dispensation methods. It is a reasonably comprehensive compilation
of existing techniques. The exact "classification" of methods is arbitrary.
METHODS OF NON-CONTACT DISPENSATION
-
Pulsed displacement from separate chambers
(individual reagents)
 |
Pistons (Syringes, Pumps)
|
|
Impact pressure (displacement by an inserted
body)
|
|
Pressure wave (piezo, acoustic, magneto-strictive,
Electro- magnetic)
|
Pulsed displacement from a common enclosed
chamber (common reagent)
Pulsed displacement from an open chamber
|
Acoustic wave
|
Fast expansion of liquid volume
|
Direct heat |
|
Electric discharge |
Collapsing of flexible dispensing chamber
or channel
|
Fluid (gas, liquid pressure) |
|
Mechanical impact |
Induced external stream modulation
|
Vibration |
|
Standing wave |
Pressurized flow with modulated release
|
Electro-magnetic valves (Universal
Dispenser) |
|
Piezo (magnetostrictive) valves |
|
Pinch valves |
|
Rotating, sliding (ceramic) valves |
Surface modification (self forming droplets)
|
Hydrophobic and hydrophilic zones (dipping, spraying) |
Solvent phase modifications
|
Icicle formation |
|
Gel formation |
Atomized flow (Area
"Shower" Dispenser)
|
Masked dispensation |
|
Electrostatic focusing |
|
Electrostatic attraction |
Capillary retainers (with "knock off")
|
External surface |
|
Internal & Split capillaries |
Gravity modulation
|
Centrifugal dispensation |
|
"Knock-off" |
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TechElan has
developed a line of proprietary non-contact dispensation devices supporting
various dispensation requirements.
Among them
are:
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