Fig. 1

SEM images and water contact angles of the SLM, SLA, SAH, and SAO samples. SEM images of the SLM group at 2500× magnification (a) and at 5000× magnification (b). Water contact angle of 77.5 ± 1.1° for the SLM group (c). SEM images of the SLA group at 2500× magnification (d) and at 5000× magnification (e). Water contact angle of 95.8 ± 2.4° for the SLA group (f). SEM images of the SAH group at 50,000× magnification (g) and at 100,000× magnification (h). Water contact angle of 19.0 ± 0° for the SAH group (i). SEM images of the SAO group at 50,000× magnification (j) and at 100,000× magnification (k). Water contact angle of 0 ± 0° for the SAO group (l)