How to Measure Surface Tension with the Goniometer

To measure surface tension with the Goniometer, use the following steps:

First Task

1. To set up the system, begin by attaching the tilt stage to the base. Make sure it is securely fastened.
2. Next, take the time to adjust the screws on the stage to ensure it is perfectly level, which is important for accurate measurements.
3. Following this, attach the clamping mechanism to the tower securely. This mechanism will be used to hold the syringe.
4. Now, plug in both the USB and power cables, and then switch on the system to power it up.
5. Place the calibration sphere on the stage, making sure it's centered and stable for calibration purposes.
6. Start the camera to begin capturing images or video.
7. Proceed to focus the camera onto the calibration sphere to obtain a clear image.
8. After focusing, lock the lens in place to maintain the desired focus setting.
9. In the software interface, select 'Image' and provide a suitable file name for the data.
10. Once the settings are in place, click the 'Record' button to start capturing data.
11. After capturing the required data, be sure to stop the camera.
12. In the software, navigate to the 'Analyse' tab to access the analysis tools.
13. Open the calibration image to use as a reference for your measurements.
14. Using the software's tools, position the region of interest (ROI) around the calibration sphere.
15. Click 'Calibrate' to complete the calibration process successfully.

Second Task

1. Moving on to the next task, attach the filled syringe to the clamping mechanism securely.
2. Restart the camera for the next set of measurements.
3. In the software, select the 'Video' mode for recording a video of the syringe experiment.
4. Choose a file name for the video recording in the software settings.
5. Click the 'Record' button to start recording the syringe experiment.
6. Gradually push the liquid out of the syringe, maintaining a steady pace.
7. Continue pushing the liquid until a droplet eventually forms and falls from the needle tip.
8. When the experiment is complete, stop the camera to end the recording.
9. Return to the 'Analyse' tab in the software interface to access analysis tools.
10. Open the video file you just recorded for further analysis.
11. From the available measurements, select the 'Pendant Drop' measurement.
12. Specify the solvent density in the software to assist with calculations.
13. Navigate to the desired frame in the video for analysis.
14. Adjust the region of interest (ROI) to surround the droplet accurately.
15. Finally, click 'Analyse' in the software to process the data and obtain your results.

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