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Svt 20 Spinning Drop Tensiometer

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The SVT 20 is used for the software controlled and video supported measurement of:
  • Static and time dependent interfacial tension between two not completely miscible liquids
  • Two and three-dimensional extensional relaxation of viscoelastic liquids and liquids droplets encapsulated or enclosed in membranes
  • Yield point of e.g. liquid crystalline materials
  • Thermal expansion coefficients of liquids
  • Oil free chamber

All measurements are performed and tested according to the Spinning Drop and Oscillating Drop Method.

The 32-bit Windows XP/Vista software developed for the SVT 20 offers:

  • Time dependent control of rotational speed as well as the adjustment of the capillary position in height and tilt
  • Recording and evaluation of video sequences for the measurement of fast relaxational vibrations of drops
  • Calculation of interfacial tensions from the shape of rotating drops (spinning drops) according to the Young-Laplace equation as well as according to the Vonnegut approximation for sufficiently extended droplets
  • Calculation of relaxational modules, yield points and other rheological parameters
  • Software correction of distortions of the droplet image by the glass capillary
  • An extended liquid data base with more than 140 parameter entries

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