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Spinning Drop Method Used For Ultra-low Interfacial Tension Measurement：

Under conditions of constant temperature and constant pressure, interface energy increases as interface area increases. The increment of interface energy per unit area is referred to as interface tension, which is formed for the different attractive forces of molecules on both sides of interface to molecules on the interface. Spinning drop interfacial tensiometer can accurately analyze low / ultra-low interface tension, while normal methods such as Wilhelmy plate method and Du Nouy ring method are incapable of measuring such low values.

In general, interface tension of 10-2-10-1mN/m is referred to as low interface tension, and that of below 10-3mN/m as ultra-low interface tension.

To measure ultra-low interface tension, the original balance between gravity and interface tension should be artificially altered to enable the shape of balanced droplet can be easily measured. Making system rotate to increase action of centrifugal force field is the measurement principle of spinning drop method. As shown below：

 Application                                                                      
- IFT measurement of liquid-gas, liquid-fluid or liquid-fluid and liquid gas via pressure and temperature
- Development of ASP, binary liquid mixture systems or carbon-dioxide flooding in oil field
- Measuring surface tension or interface tension under high pressure and setup temperature by spinning drop
method (max pressure:75Mpa and max temperature: 200℃)
- Development of surfactant

 Schematic Draw of TX500HP

 Performance feature                                                            

Leading technology at ultra-high pressure and temperature spinning drop chamber with easy operation and safer
1, various spinning drop chamber with different pressure for choice to meet your special need (5M Pa, 10M Pa, 30M Pa, 50M Pa, 70M Pa  or customization)
2, Build in heating system with max temperature 200℃ or more（Accepting custom-made）
3, Removable spindle system: Replaceable sample tube and easier to clean sample tube and sealing part to avoid cross pollution
4, Dynamic sealing system and high speed spindle made of Ti to promise dependable sealing and lower locked-rotor torque
5, Providing extra connector port for inert gas, nature gas or CO₂

Mechanics-professional and easy to operate
1, Mechanics of three-axis precision positioning stages for lens control provide you clearer imaging and more accurate imaging position;
2, Lens tilt control and level control of chamber facilitate determining baseline between melt and solid and easy to get a vertical needle.
3, Tilted unit for adjusting vision angle of parallel background light to promise a good drop shape.

Clearer and higher speed vision system
1, Advanced drop shape profile lens and parallel background light ensures sharper imaging and clearer drop image edge;
2, Continuous zoom industrial lens with magnification of 0.35－4.5X enables larger VOA, suitable for samples of varies volumes;
3, Lens with long working distance (180mm) effectively protect vision system from high temperature;
4, World highest speed camera from Germany can reach 87FPS (WVGA)-340FPS (GIF)

World leading analysis software CAST®4.0
1, Calculating interface tension automatically which is useful for measurement of dynamic interface tension:
You can measure interface tension (IFT) via time by just press one button “measurement” to start capturing drop image, calculating IFT, saving captured images and calculated result without any manual intervention. IFT via rotating speed, temperature, pressure and time will saved and managed by CAST4 and it can be exported into an Excel file.
2, Calculating average IFT based on drop profile instead of two points at drop edge to acquire high precision result.
3, Humanized software design and database management to promise：
(1) Wizard design of standard windows is designed for various measurement operators.
(2) Database management: one-to-one correspondence between measured value and image; query and modifying of historical data at anytime
(2) Measured data is Excel exportable for you to create your measurement report conveniently.
(3) Secondary modification of eigenvalue. The software will record all your operation traces for you to check measured data, effectively avoiding errors caused by human.
(5) Comfortable language interface designed by Unicode enables more convenient and compatible for you to operate.