Fig. 2: a Relationship between the CA and the wetting time in the presence of an acidic solution (pH 1). | NPG Asia Materials

Fig. 2: a Relationship between the CA and the wetting time in the presence of an acidic solution (pH 1).

From: Naked-eye point-of-care testing platform based on a pH-responsive superwetting surface: toward the non-invasive detection of glucose

Fig. 2

b Relationship between the CA and the wetting time in the presence of an alkaline solution (pH 13). c Calibration curve over a wide range from pH 1 to 13 examining the relationship between the CA and pH. d Linear relationship between the CA and pH from 1 to 7. e Wetting states of droplets with different pH values. The volume of the test droplet is 2 µL. f Wetting states of in situ neutralization of the superwetting surface by mixing 1 µL of a pH 6 solution with 1 µL of pH 3 and 1 µL of pH 1 solutions sequentially. g Control experiment of in situ neutralization using a pH 6 solution instead of pH 3 and pH 1 solutions. Error bars indicate the standard deviation of three replicates. h Digital photos and CA measurements of droplets with distinct colors

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