As shown in Figure 6 a,b, the WCA shows a decreasing trend and the SA has an increasing trend.
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Facile Preparation of a Robust and Durable Superhydrophobic Coating Using Biodegradable Lignin-Coated Cellulose Nanocrystal Particles.
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With the increase of the abrasion cycles, the WCA decreases and the SA presents an increasing trend, resulting from the severe damage and wastage of the rough surface structure (as shown in Figure 5 e–h).