Technical Information Magazine 202305-03 Contact Angle in Microscopic Areas Using X-ray CT

This introduces the evaluation of contact angles in micro-regions and uneven surface shapes using X-ray CT, taking into account the effects of droplet size, sample surface heterogeneity, and the shape of the contact surface.

The technical information magazine The TRC News provides the latest information on analytical techniques that are useful for research and development, solving production troubles, and quality control. **Abstract** In measuring contact angles, the use of X-ray CT (computed tomography) methods, which can non-destructively capture the internal structure of samples in three dimensions, is effective for micro-regions, uneven shapes, and within materials. The contact angle measured in micro-regions using X-ray CT is significantly influenced by droplet size, the heterogeneity of the sample surface condition, and the shape of the contact surface. Therefore, it is important to evaluate these factors rather than simply comparing the magnitude of the contact angle. Here, we present results that verify these influences using three-dimensional observation data from polyethylene films and nylon threads. **Table of Contents** 1. Introduction 2. Influence of Droplet Size on Contact Angle 3. Contact Angle Measurement Using X-ray CT in Fibers 4. Conclusion

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