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The dynamic contact angle measuring devices and tensiometer of the DCAT series are universal measuring devices for the force-based measurement of interfacial parameters and phenomena.

Surface tension acts to contract and minimise any liquid surface. If a surface is being enlarged by the formation of a liquid lamella, as a test body, such as a Wilhelmy plate or Du Noüy ring, is in contact with it, the surface tension exerts a tensile force that can be measured. Within a tensiometer this force is measured by a high precision weighing system and, hence, the surface tension of the liquid can be calculated.

Using a tensiometer, also the interfacial tension between two liquids can be measured with the help of a test body. Since tensiometry is based on force measurements it is – in contrast to the optical analysis of pendant drops – not necessary that one of the liquids is transparent or that the refractive index differs between the two liquids. Therefore, tensiometry is in many cases a handy alternative to the optical measurement of surface and interfacial tensions.

Key features

  • Electrodynamic compensation weighing system of highest resolution with automatic and manual calibration function
  • Software controlled, motor-driven height positioning of the sample receptacles with variable speed
  • Automatic coupling lock for the balance
  • Automatic crash protection for measuring probes during measurement
  • Closed illuminated sample chamber
  • Digital thermometer with connections for two Pt 100 temperature sensors
  • Includes a TP 50 control panel with touch screen and precision control wheel
  • Compatible with the liquid dosing unit LDU 25
  • Compatible with the Langmuir trough module LTMr
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DataphysicsDataPhysics Instruments offers a wide range of measuring devices for the analysis of the chemical and physical properties of surfaces and interfaces. The product range comprises optical contact angle measuring and contour analysis systems, dynamic contact angle measuring devices and tensiometer, as well as spinning drop tensiometer and analysis systems for liquid dispersions. The measuring devices are complemented by an extensive array of accessories and extensions like for example a humidity generator. Hence a tailor-made combination of measuring device and accessories can easily be found to take on your individual surface and interfacial measuring challenges.
[DataPhysics, Dynamic Contact Angle measuring devices, Tensiometer]