Lauda^® Drop Volume Tensiometer TVT-2

The Lauda TVT-2 uses the principle that the volume of a drop falling from a needle is directly related to the surface or interfacial tension of the test solution. Drop volume determination with the TVT-2 is accurate and precise. (The sensitivity for interfacial tension is 0.1 mN/m and for drop volume is 0.01 µl.)

Features

• Characterizes dynamic behavior of surfactant molecules in the range of seconds to hours on both surfaces and interfaces
• Gas-tight closure of system—allows for measurement of highly volatile and/or toxic substances
• Eliminates wetting problems encountered with ring, plate, or frame techniques
• Requires minimal sample amounts from 250 µl to 5 ml
• Maintains constant temperature (5 to 90°C) in entire measuring system
• Allows drop formation speed to be adjusted—results are based solely on drop dynamics and not the effects of turbulence on drop surface
• Automatically adjusts intensity of drop detection light cell—ideal for measuring opaque liquids

Computer Control and Software

• Evaluation of measured surface and interfacial tensions
• Presentation of data in tabular and/or graphic formats
• Extrapolation of data to static (equilibrium) values

Dynamic surface tension plot for a typical
surfactant solution obtained with the Lauda
Drop Volume Tensiometer.