attension Theta, User Manual

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Figure 5.4. By right clicking the image in the Analysis tab, the recorded images can be saved either as
separate picture, which can be selected by the frame selector, or as video.
5.3 Surface free energy calculations
In surface free energy (SFE) calculations, data from Sessile Drop experiments is utilized to calculate the
surface free energy of the solid. Please see the Chapter 6 to go through the theory of the surface free
energy.
In SFE calculations you need to mark minimum of two different contact angles, which are performed with
different probe liquids. In the Analysis tab, select the chosen angle by highlighting the row and then right
clicking the Mark as contact angle (Figure 5.5). Also group of the data points can be selected, when the
software calculates the average of the selected data points. The selected contact angle result will be
visible in the Calculated results window in the lower right corner of the Analysis tab.
After chosen the preferred contact angle value used in the SFE calculation, right click the row in the
Calculated result window and choose Send to SFE as shown in Figure 5.6. The SFE analysis tab will
become visible (Figure 5.7). After this mark and send as many contact angle values as preferred used in
the SFE calculations.
Figure 5.5. Mark the preferred contact angle value for SFE calculations.