Positive displacement pipettes necessitate the use of special tips, therefore, this kind of pipetting is more expensive than air displacement pipetting. How a positive displacement pipette works.

First, it’s about choosing the best tools for the application, like using air displacement pipettes for aqueous solutions, or a positive displacement pipette for highly viscous and volatile liquids.

Micropipettes are broadly classified in to two major types, air cushion and positive displacement pipettes. In the air cushion pipettes, the piston operates inside an airtight cylinder creating vacuum ...

A third method, using positive displacement pipettes, yielded the best results (see video below). A small plunger inside the pipette touches the sample directly, ensuring that no air gets in.

The positive-displacement pipette tip technology is suitable for working with complex liquid classes (viscous, dense, volatile, corrosive, or even radioactive) and prevents air-gap formation between ...