Non-Contact Dispensing
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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

 
  1. Pulsed displacement from separate chambers (individual reagents)
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    Pistons (Syringes, Pumps)

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    Impact pressure (displacement by an inserted body)

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    Pressure wave (piezo, acoustic, magneto-strictive, Electro- magnetic)

  2. Pulsed displacement from a common enclosed chamber (common reagent)

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    Collapsing sponge (Matrix Dispenser)

  3. Pulsed displacement from an open chamber

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    Acoustic wave

  4. Fast expansion of liquid volume
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    Direct heat

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    Electric discharge

  5. Collapsing of flexible dispensing chamber or channel
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    Fluid (gas, liquid pressure)

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    Mechanical impact

  6. Induced external stream modulation
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    Vibration

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    Standing wave

  7. Pressurized flow with modulated release
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    Electro-magnetic valves (Universal Dispenser)

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    Piezo (magnetostrictive) valves

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    Pinch valves

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    Rotating, sliding (ceramic) valves

  8. Surface modification (self forming droplets)
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    Hydrophobic and hydrophilic zones (dipping, spraying)

  9. Solvent phase modifications
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    Icicle formation

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    Gel formation

  10. Atomized flow (Area "Shower" Dispenser)
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    Masked dispensation

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    Electrostatic focusing

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    Electrostatic attraction

  11. Capillary retainers (with "knock off")
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    External surface

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    Internal & Split capillaries

  12. Gravity modulation
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    Centrifugal dispensation

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    "Knock-off"

 

TechElan has developed a line of proprietary non-contact dispensation devices supporting various dispensation requirements.

 

 Among them are:

 

bullet Dispenser/Aspirator - a universal device for precise dispensation of small volumes of individual reagents (CVs < 5%);
bullet Area "Shower" Dispenser for simultaneous "area" coverage with small volumes of a common reagent (CVs < 10%);
bullet Matrix Dispenser for directed dispensation of small volumes of a common reagent (CVs < 7%);
bullet Electro-Magnetic "Voice Coil" Dispenser as a low cost dispenser for individual reagents (CVs < 12%);
bullet Common Manifold Dispenser for simultaneous dispensing of larger (> 1Ál) volumes of a common reagent (CVs < 15%).