Option - CA200

The Pressure Cell CA200 is designed to work with the TRACKER H and S.  
Drop generation and control is accomplished using a high pressure pump (available as an option). There is a platform on which the contact angle of the substrates can be heated or cooled by a water bath (available as an option).

Surface and interfacial tension can be measured by the pendant drop method or rising drop method and the contact angle can be measured by the captive bubble method.

Principle

The CA200 uses a high pressure syringe pump to achieve drop or bubble control. The CA200 has an interior platform to hold solid samples for contact angle measurement. This platform can be heated or cooled independently from the remainder of the chamber.
Temperature is controlled by use of one or two circulating baths. Drops are deposited on the solid surface by moving a needle down to the surface. The CA200 is pressurized using a variety of gases such as nitrogen, argon, carbon dioxide, and methane.

Application

• Surface and interfacial tension of a bubble of a gas or a drop of liquid in another liquid
• Wettability of a solid substrate by measuring contact angle
• Advancing and receding contact angle
• Interfacial rheology
  
  

Technical Characteristics

• Working pressure:  200 bar maximum
• Working temperature: 150 °C maximum
• Material of construction: Stainless Steel 316 Ti
• Internal volume: 17 mL
• Removable shelf for contact angle measurements
• Separate temperature control of the shelf for solid surfaces (contact angle measurements)
• Vertical position of the capillary can be adjusted under pressure :
  Amplitude of 10 mm with a precision of ± 0.1 mm
  Internal diameter of the capillary:  0.5 - 1 mm.
• Size of solid substrate for contact angle measurement:  20 mm diameter maximum Two Al2O3 windows
• Temperature measurement by thermocouple.

Pump option

For drop generation and control, TRACKER software can drive a high pressure pump:
« Isco » www.isco.com

Several kinds of pumps can be used depending on the volume of the fluids or the flow rates used.