|
| 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
|
All
measurements are performed and tested according to the Spinning Drop and
Oscillating Drop Method.
The
32-bit Windows XP/2000 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
|
Technical
data: |
| Measuring
range: |
- Interfacial
tension: 1·10-6
… 2·103 mN/m
|
| Speed
range: |
-
0
... 20,000 rpm, Accuracy: ± 0,5 rpm
-
Speed
regulation: max. ± 2.000 rpm/s
- Oscillations
frequency: 0,01 ... 200 Hz with minimum 3000 rpm
|
| Measuring
methods: |
- Spinning
Drop-Method
- Oscillating
Drop-Method
|
|
|
