AI Article Synopsis
- The study verifies the wetting criterion, particularly the intrinsic contact angle, to distinguish hydrophilic from hydrophobic textured surfaces through experimental methods.
- It utilizes X-ray tomography to accurately measure the shapes of textured surfaces and synchrotron X-ray imaging for visualizing their wetting states.
- Findings suggest that the intrinsic contact angle should be corrected from the previously assumed 90° to 43°, and nonwetting behaviors for angles between 43° and 90° are examined.
Article Abstract
In this study, the existing knowledge on the wetting criterion, that is, the intrinsic contact angle, for distinguishing between hydrophilic and hydrophobic textured surfaces is verified experimentally. A precise apparent contact angle is measured on micro-, nano-, and micro-/nanotextured surfaces to quantitatively define the surface-wetting conditions. In particular, X-ray tomography is introduced to measure precise geometric morphologies of nano- and micro-/nanotextured surfaces, and the wetting state of the textured surfaces is clearly visualized using synchrotron X-ray imaging. By comparing previous theoretical models and experimental results, it is verified that the intrinsic contact angle for distinguishing between hydrophilic and hydrophobic textured surfaces should be corrected from 90° to 43°. In addition, nonwetting phenomena in the region of the intrinsic contact angle between 43° and 90° are discussed.
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| http://dx.doi.org/10.1021/acs.langmuir.8b03407 | DOI Listing |
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