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This instrument is designed as an additional module for the PAT-1, using the video image acquisition for the determination of the drop size.
If drops have a spherical shape (very small and/or low density), the measurement of the pressure P together with the radius of curvature r yields the interfacial tension.
For measurements of interfacial tensions between a liquid and a fluid, the density difference is needed. Calibration against the external and hydrostatic pressure is needed.
For drop/bubble oscillation experiments only pressure changes have to be measured along with the phase shift to the generated area oscillation.
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Features of the Instrument |
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- Drop oscillation at frequencies from 1 to 100 Hz to determine the dilational elasticity and viscosity of interfacial layers
- Applicable to bubbles and drops (also immersed in a second liquid)
- Easy temperature control
- Measurement of interfacial tension between two liquids of same density (see also DPA-1)
- Dynamic interfacial tensions for adsorption times between 50 ms and hours
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