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To evaluate the hydrophilicity of electrospun membranes, the water contact angle (WCA) on the samples was measured using an optical contact angle goniometer (Optima, Beijing Wuzhou Oriental Technology Development Co., Ltd., Beijing, China). The membranes were cut into small pieces of 1 cm × 1 cm. Using 2 µL of deionized water as the test liquid, the WCA was recorded at 120 s and averaged six times for each sample tested [29,32,33].
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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
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