Option - Dense phase exchange cell (DPEC)

Proteins and some surface active materials will adsorb irreversibly or not onto a gas/liquid or liquid/liquid interface.  It is often worth changing the dense phase (from which molecules are being adsorbed) with a new solution to quantify this irreversibility. The DPEC option can be adapted to the Tracker.

Principle

Dense phase liquid is held in a thermostatically jacketed cuvette fitted with an inlet and outlet tube.  The liquid can be slowly withdrawn from this cuvette and replaced by a second liquid phase.  The software controls the liquid circulation rate.  The surface/interfacial tension is continuously measured during the liquid exchange.

Application

- Surfactants desorption
- Competitive adsorption of surfactants.