SINTERFACE technologies

An Interfacial Shear Rheometer (ISR-1) is also offered by Sinterface Technologies for measuring interfacial shear properties, in the frequency range 0.02 to 0.2 Hz, dependent on the measurement system, in the temperature range 10 to 50°C. The measurement ranges of the rheometer include surface shear viscosity... 

Figure 14. Schematic diagram of maximum bubble pressure tensiometer using a gas flow oscillation analyser (BPA, SINTERFACE Technologies).

The two methods maximum bubble pressure and profile analysis tensiometry complement each other experimentally and cover a total time range of nine orders of magnitude from about lO" seconds up to 10 seconds (many hours). The example given in Fig. 33 shows the dynamic surface tension of two Triton X-100 solutions measured with the instruments BPA and PAT (SINTERFACE Technologies) over the time interval of 7 orders of magnitude. As one can see, the experiments cover the beginning of the adsorption process and the establishment of the equilibrium state. 

The density and refractive index were measured as previously described and are displayed in Table 21.2. The surface tension of the solution was analyzed by a bubble shape tensiometer (PAT-1, Sinterface Technologies, Berlin, Germany). The system was calibrated with purified water before each measurement. The surface tension of all investigated solutions was found to be almost constant within the measurement time range of 0-600 s (see Table 21.2). 

We report here on dynamic surface tensions recently obtained from BPA (from SINTERFACE Technologies, Berlin, Germany) measurements on micellar solutions of C 4EOg. 

Using the drop and bubble profile analysis tensiometer PAT-1 (SINTERFACE Technologies, Berlin, Germany) it is possible to perform dilational rheology studies of surfactant solutions at low frequencies. 

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