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Effect of CS content on the hydrophobicity and surface morphology of electrosprayed paper and Al foil substrates: (A) water contact angle (WCA) varied with CS content; (B) typical WCA photos of the curves from (A) (the arrow indicates the increasing direction of CS content); (C–F) SEM images of electrosprayed samples with CS contents of 0 g and 0.3 g on paper (C,E) and Al foil (D,F), respectively (insets are the enlarged images of each samples).
