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. 2020 Jun 2;10(6):1101. doi: 10.3390/nano10061101

Figure 8.

Figure 8

Water contact angle (CA) vs. the number of laser pulses: (a) Water CA vs. the number of laser pulses. (b) column chart diagram of CA and fractal dimensionality vs. laser fluence. The mean correlation factor is −0.833; (c) column chart diagram of CA and area RMS of PAM vs. laser fluence. The mean correlation factor is 0.768 pointing to a strong correlation between fractal dimensionality, CA, and area RMS over a wide range of laser fluence; (d) column chart diagram of water CA at different time intervals. The almost similar slopes point to a uniform surface response at different VUV photon fluence. From Figure 4a, Figure 5a,b, Figure 7a,b and Figure 8a the surface chemical modification is saturated at ~500 laser pulses, because of the low penetrating depth of the 157 nm laser photons, indicating the strong correlation between fractal dimensionality, CA, area RMS, Young’s modulus and surface modification.