1. 界面科学測器の協和界面科学
  2. Kyowa Interface Science
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  4. Contact Angle Meter
  5. Analysis software FAMAS

Analysis software FAMAS

Sessile drop method

Sessile drop method in time function

Sessile drop method in time function

Extension/contraction method

Extension/contraction method

The extension/contraction method is also known as captive drop method.
Advancing and receding angles are measured while increasing or decreasing the volume of a droplet captured by the needle on the solid surface. An automatic dispenser system which ensures a constant flow rate for high reproducibility is highly recommended to perform this measurement method effectively.

Applications: Coating properties, repellency, characterization of droplet hysteresis

Sliding method

Sliding method

The sliding method is also known as tilting method or roll-off method. Advancing and receding angles are measured while an external tilting stage tilts the instrument up to an angle of 90 degrees. The inclined angle, at which the droplet starts to slide or roll off from the solid surface is called the sliding angle. At the same time, the adhesive energy between the droplet and the solid surface is analyzed at the same time. As the adhesive energy does not depend on the droplet volume, this value can be used as an indicator to compare liquid samples of different volumes.
The sliding kit consisting of an external tilting stage and FAMAS software add-on is required to perform roll-off angle measurements.

Applications: Repellency/hydrophobicity, characterization of droplet hysteresis

Dynamic sliding method

Dynamic sliding method

The basic idea is the above-mentioned sliding method, but this method focuses on the roll-off speed and the roll-off acceleration of a droplet sliding off an inclined surface to observe hydrophobic and oleophobic properties in more detail.

Three-state method

Three-state method

The basic idea is the above-mentioned sliding method, but this method focuses on the roll-off speed and the roll-off acceleration of a droplet sliding off an inclined surface to observe hydrophobic and oleophobic properties in more detail.

Three-state method
Three-state method

Algorithms of contact angle analysis

Surface free energy analysis of solids

Surface/interfacial tension of liquids

Surface/interfacial tension of liquids

The pendant drop method enables to measure surface and interfacial tension of liquids by using the algorithms of Young-Laplace or ds/de methods. The pendant drop method has advantages in the following points compared to the conventional Wilhelmy plate and du Noüy ring method:

    • Measurement of only small amount of liquid (less than 1mL)
    • High-temperature control (e.g. molten polymer applications)
    • Due to short-term exposure to air, suitable for liquids that change surface tension quickly.

The pendant drop kit as an option is required.

Automatic recognition of droplet deposition

Focusing aid & droplet volume monitoring

Focusing aid & droplet volume monitoring
    • Focus level indicator: A bar chart and value is displayed in the live monitor and helps to adjust the focus quickly and easily.
    • Droplet volume display: The actual droplet volume is constantly being measured and displayed on the image monitor to help manual dispensing. When using an automatic dispenser, the droplet volume is automatically controlled by the software.

Display of data

Display of data

Spreadsheet-like measurement sheets: Measurement results, as well as the average and standard deviation of each row data, are displayed in measurement sheets with 45x10 (RxC) cells.

  • Variable data: Besides the contact angle, droplet volume, absorbing amount and ratio, droplet height, and droplet width are also being obtained.
  • Charts: Different charts like contact angle against elapsed time can be drawn when measuring time function mode. The actual droplet volume is constantly measured and displayed on the live image monitor.

The droplet volume is software-controlled when using an automatic dispenser system.

Pixel calibration

Pixel calibration
Pixel calibration

Other functions

Other functions
  • Movie converter: Converts the measurement images of time function to MPEG/AVI movie format.
  • Threshold level adjustment: Helps to optimize the image analysis. Both the relative and absolute level adjustments are possible.
  • Data correction on convex surfaces: The contact angles on convex surfaces, such as lenses and tubes in cross-section, can be corrected by simply entering the value of the substrates radius or by actually measuring the curvature.

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