2.4. Contact Angle Measurements

Water contact angles (WCAs) of the fabrics covered by the produced films were measured by a contact angle analyzer (OCA, Dataphysics, Stuttgart, Germany), and the sessile drop method was used. Stability Testing was performed by an ultrasonic cleaning machine (JP-100, Jiemeng Cleaning Equipment Co., Ltd., Shenzhen, China), which provided an important indicator for preparing durable superhydrophobic fabric. The plasma-treated fabric was completely immersed in 95% alcohol and ultrasonic for 20 min, then removed and cleaned with deionized water three times. Finally, the plasma-treated fabric was placed in an oven and dried at 60 °C for 60 min. The contact angle of each sample after ultrasonic cleaning was secondly measured. The average angle was obtained by testing five different locations of each sample with ~10 μL of water droplets. Rolling angles (RAs) were detected using the sessile drop method and 10 μL deionized water droplets with the optical contact angle measuring instrument (OCA, Dataphysics, Stuttgart, Germany). RAs were determined by tilting the sample stage at a rate of one degree per second until the drops started moving and rolled off the sample surface.