These caps have cylindrical sample compartments of 7mm diameter and a range of depths, as listed below. Use them to measure dynamic and steady-state water desorption properties of in-vitro samples such as hair, nail, excised Stratum Corneum, polymers, papers, textiles, etc.
The caps are precision machined from hard PTFE. They have cylindrical sample compartments of 7mm diameter and a range of depths, as shown below:
AF106-01 (5mm depth)
AF106-02 (10mm depth)
AF106-03 (15mm depth)
AF106-04 (20mm depth)
AF106-05 (25mm depth)
AF106-06 (30mm depth)
AF106-07 (35mm depth)
Desorption measurements using an AquaFlux™ are quick and straighforward. Proceed as follows:-
- Pre-condition it in a controlled humidity & temperature environment.
- Place it into a desorption cap of appropriate size.
- Couple the desorption cap to the AquaFlux™ measurement head.
- Record a flux time-series with the AquaFlux™ program. That’s it.
- Remove the dry sample from the desorption cap and weigh it.
The controlled, low humidity within the AquaFlux™ measurement chamber causes any absorbed water in the sample to evaporate.
The time-series data recorded by the AquaFlux™ software includes the time-dependent desorbed water quantity, calculated as the area beneath the flux time-series curve. Use the initial mass of the sample to normalise this to a mass percentage.
Use a range of pre-conditioning humidities to measure sorption isotherms, for example.