Surface tension measurement for rapid wetting processes
Speed
Printing – bonding – spraying – cleaning: processes such as these require surfactants that are already effective in fractions of a second – and an instrument that can record their effectiveness. The Bubble Pressure Tensiometer BP100 determines the dynamic surface tension as a function of the surface age in a time window from only 5 milliseconds up to 100 s.
Technique
A software-controlled flow of compressed air emerging from a capillary produces air bubbles in the sample. A sensitive pressure sensor determines the maximum pressure during bubble formation, from which the surface tension can be obtained. Thanks to its built-in compressor the instrument does not need an external compressed air connection. Thermostatted measurements are possible without any problems.
Knowledge
In addition to the time-dependent surface tension, the measurement also supplies the stationary 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.
Comfort
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.
About Krüss Laborgeräte
Established in 1796, A.KRÜSS Optronic has been producing high-precision optical measuring instruments for more than 200 years. In a nationwide competition held in 2005 the company won an award to become one of Germany’s "Top 100" innovative medium-sized companies. As part of our heritage we not only consider it a social obligation to train apprentices in both the technical and commercial sectors but also an essential factor in our long-term innovation process.
