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The Effect of Drop Volume on Contact Angle
Joseph McGuire1, Jianguo Yang1
1Departments of Bioresource Engineering and Food Science & Technology, Oregon State University, Corvallis, Oregon 97331-3906.
Journal of Food Protection
|May 5, 2019
Summary
The study found that liquid drop volume affects surface contact angles, especially below a critical volume. This critical drop volume varies by material due to surface energy differences, impacting food contact surface evaluations.
Area of Science:
- Materials Science
- Surface Chemistry
- Food Science
Background:
- Contact angle measurements are crucial for evaluating food contact surface properties.
- Liquid behavior on surfaces is influenced by factors like drop volume and surface characteristics.
Purpose of the Study:
- To investigate the effect of varying drop volumes on equilibrium contact angles.
- To identify the critical drop volume (CDV) and its relationship with material properties.
- To understand how surface energetic heterogeneities influence contact angle behavior.
Main Methods:
- Equilibrium contact angles were measured for polar and nonpolar liquids on six different materials.
- Drop volumes ranged from 2 to 40 μl.
- Analysis focused on the correlation between drop volume, contact angle, and material surface properties.
Main Results:
- Contact angles increased with increasing drop volume below a specific threshold.
- A critical drop volume (CDV) was identified, which varied significantly among the tested materials.
- The observed variations in CDV were attributed to differences in surface energetic heterogeneities.
Conclusions:
- Drop volume is a critical parameter influencing contact angle measurements, particularly for evaluating food contact surfaces.
- Surface energetic heterogeneities dictate the critical drop volume, affecting the reliability of contact angle measurements.
- Understanding CDV is essential for accurate surface characterization and material selection in food contact applications.
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