Measurements of vapor uptake and release from thin films coated on the sensor can be conducted. A typical application for this module is to measure the swelling of polymer or cellulose films. The use of this saturated salt equilibrium vapor pressure chamber is a well-established and cost-effective method if compared to the use of a humidity generator in conjunction with e.g. standard flow module.
The sensor surface is separated from the liquid flow by a GORE-membrane* thereby creating an air-filled compartment over the sensor. Flowing saturated salt solutions over the membrane will generate a specific and controlled relative humidity in the volume above the sensor surface. The humidity above the sensor equilibrates almost instantly, enabling real-time measurements.
Specification
General specifications
Compatibility
Compatible with all QSense sensors, QSense Explorer, Analyzer and Pro (via an add-on Explorer chamber)
Internal volume
Air pocket: 100 mm3 between the sensor and the membrane Liquid flow system: 120 μl from inlet to outlet (above membrane)
Type of measurements
Vapor sorption / desorption
Maximum temperature
70 °C
Materials exposed to the liquid
Viton® (O-ring and sealing gasket), titanium (flow path), GORE-membrane
Cleaning
All parts may be disassembled for separate cleaning, except the module base contacting the chamber platform. Do not use surfactants to clean the membrane, only pure water.
