CEDT Equipment ( Contact Angle )
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| Instrument |
Optical Tensiometer |
| Manufacture |
Attention Finland |
| Model |
Theta |
| Purpose of Instrument |
- The sessile drop method is measured by a contact angle goniometer using an optical subsystem to capture the profile of a pure liquid on a solid substrate. The angle formed between the liquid/solid interface and the liquid/vapor interface is the contact angle.
- The dynamic sessile drop is similar to the static sessile drop but requires the drop to be modified. A common type of dynamic sessile drop study determines the largest contact angle possible without increasing its solid/liquid interfacial area by adding volume dynamically. This maximum angle is the advancing angle. Volume is removed to produce the smallest possible angle, the receding angle. The difference between the advancing and receding angle is the contact angle hysteresis.
- Theta is an optical tensiometer for highly accurate and easy measurements of :-
- static contact angle
- dynamic contact angle
- surface free energy
- surface tension
- wettability
- absorption
- adsorption
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