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. 2019 Dec 2;14:361. doi: 10.1186/s11671-019-3199-0

Fig. 6.

Fig. 6

TPU fiber membrane contact angle characterization. a–f Testing the contact angle of different concentrations of TPU fiber membranes using 5-μL droplets. g Contact angle of different concentrations of TPU fiber membrane. hi Droplets on the surface of fibers of different diameters.