Bubble Pressure Measurement with the BP100
A software-controlled flow of air emerging from a capillary produces air bubbles in the sample. A high-precision pressure sensor determines the maximum pressure during bubble formation, from which the surface tension is calculated. Thanks to its built-in compressor the instrument does not need an external compressed air connection. Thermostatted measurements are possible without any problems.
Scans with an almost unlimited resolution over a wide range of surface ages are controlled automatically by the LabDesk software. In addition to the time-dependent surface tension, the measurement also supplies the equilibrium value according to Hua & Rosen. Diffusion and adsorption coefficients can be calculated from surfactant concentration series – these are important parameters where the mobility of surfactants is concerned. Measurements at constant bubble ages allow further insights, e.g. for concentration or temperature comparisons.
After a minimal preparation period the measurement is carried out fully automatically up to data output in the form of a plot. With a mouse-click measuring parameters, results and evaluations appear in a comprehensive report. Thanks to the LabDesk™ software platform for all KRÜSS tensiometers data from other instruments can be included.