Tensiometry
Tensiometry is a force-based analytical method used to quantify surface and interfacial phenomena in liquids and at liquid–solid interfaces. Instruments such as the DCAT 25 (DataPhysics Instruments) determine these properties by measuring the force acting on a probe (e.g., Wilhelmy plate or Du Noüy ring) when it is brought into contact with a liquid surface or interface. The measured force is directly related to the surface or interfacial tension and can be recorded as a function of time, immersion depth, or experimental conditions.
Using the surface tension module enables precise determination of liquid–air surface tension as well as its dynamic behavior, which is relevant for studying surfactants, wetting processes, and adsorption kinetics. The interfacial tension module extends these measurements to liquid–liquid systems, allowing investigation of emulsions, oil–water interfaces, and mass transfer phenomena. Dynamic measurements provide insight into interfacial adsorption processes and equilibrium formation.
In addition, the critical micelle concentration (CMC) module allows systematic evaluation of surfactant solutions by measuring surface tension as a function of concentration. The resulting surface tension–concentration curve enables identification of the CMC and assessment of surfactant efficiency and purity. Controlled temperature and environmental conditions further support reproducible and quantitative analysis.
Determination of:
- surface tension
- interfacial tension
- critical micelle concentration
Equipment:
- DCAT25 (DataPhysics Instruments GmbH)
- Modules: SFT, IFT, CMC
| Contact: | Sandra Seywald | Ute Heinz | |
| Phone: | 06131-379 - 227 | 06131-379 - 533 |