Page 27 - MSAM-2-2

Materials Science in Additive Manufacturing Water repellence via pinecone structures

A B C

Figure 1. Schematic of structures: (A) “CALM”; (B) cone; and (C) pinecone.

A

B

C
Figure 2. The schematic two-photon polymerization fabrication process
set-up.

A

D

B
Figure 4. Scanning electron microscope images of fabricated “CALM”
structures with the laser power (A) 0.8 μW, (B) 1.0 μW, (C) 1.2 μW, and
(D) 1.4 μW.

Table 1. Nomenclature and the processing parameters
Sample Scanning Hatch Layer
strategy spacing (nm) thickness (nm)
Figure 3. Distribution of (A) single row and (B) double rows of pinecone UHT-200-200 UHT 200 200
structures in the water flow test.
UHT-200-100 UHT 200 100
clearly when the laser power was 0.8 μW and is therefore UHT-100-200 UHT 100 200
not measured in Figure 4A. It was also found that the width UHT-100-100 UHT 100 100
of nanowires increased from 203 nm to 307 nm with the CHT-200-200 CHT 200 200
laser power increasing from 1.0 μW to 1.4 μW, as indicated UHT: Unidirectional hatching; CHT: Contour hatching
in Figure 4B-D. Besides, the contrast between the printed
text and the substrate increased with the increasing laser 3.2. Cone structures
power, indicating that the stiffness of the built structures The cone structures without nanoscale details were built
increased. with hatch spacing of 200 nm and layer thickness of 100 nm.

Volume 2 Issue 2 (2023) 3 https://doi.org/10.36922/msam.0879