The module DS4270 is used for analyzing drops to measure interfacial rheological properties of liquids. In doing so, the change in the surface tension or interfacial tension is measured as a drop specifically changes in size. The magnitude of the change is mathematically divided into an elastic and viscous component (elasticity and viscosity modulus). The results provide information on the mechanical and time-dependent stability of foams, films and emulsions.
During the measurement, a pendant drop is produced, the size of which is changed periodically with accurately controlled amplitude and frequency. The module's piezo unit produces an exactly sinusoidal oscillation which guarantees a reliable evaluation. The instrument's camera then records a video of the oscillating drop with very high image quality. This video is automatically evaluated, frame by frame, to precisely calculate the elasticity and viscosity modulus.
The DS3270 module is already included in the instrument DSA30R, which we have specially put together for interfacial rheology.