1. Tulip-Shaped Pattern Imprinting for Omni-Phobic Surfaces Using Partially Cured Photopolymer
- Author
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Su Hyun Choi, Seonjun Kim, Woo Young Kim, Young Tae Cho, Do Hyeog Kim, and Seok Kim
- Subjects
tulip-shaped pattern ,Materials science ,02 engineering and technology ,010402 general chemistry ,lcsh:Technology ,01 natural sciences ,lcsh:Chemistry ,Contact angle ,chemistry.chemical_compound ,Nano ,Surface roughness ,General Materials Science ,Composite material ,lcsh:QH301-705.5 ,Instrumentation ,Lithography ,nano-imprint lithography ,Curing (chemistry) ,Fluid Flow and Transfer Processes ,Polydimethylsiloxane ,lcsh:T ,Process Chemistry and Technology ,deformation ,technology, industry, and agriculture ,General Engineering ,oxygen transmission ,curing inhibition ,021001 nanoscience & nanotechnology ,lcsh:QC1-999 ,0104 chemical sciences ,Computer Science Applications ,Photopolymer ,lcsh:Biology (General) ,lcsh:QD1-999 ,chemistry ,lcsh:TA1-2040 ,lcsh:Engineering (General). Civil engineering (General) ,0210 nano-technology ,Layer (electronics) ,lcsh:Physics ,omni-phobicity - Abstract
Functional films with hydrophobic, oleophobic, anti-fouling, anti-icing, anti-bacterial and low reflectance properties can be produced by patterning nano- or micro-structures on films via nano imprint lithography. Here, an omni-phobic surface showing both hydrophobicity and oleophobicity was obtained without chemical surface treatment by increasing the surface roughness and deforming the pattern morphology using only nano imprint lithography and the oxygen-inhibited curing properties of polyurethane acrylate (PUA) resin. A tulip-shaped pattern imprinting process was designed in which microscale patterns were fabricated using a porous polydimethylsiloxane (PDMS) mold with high oxygen transmission. During ultraviolet (UV) curing, a curing inhibiting layer was formed by reaction with oxygen. Next, a PDMS pad was used for the pressurized curing of the curing inhibition layer to modify the micro scale structures. Finally, final curing of the deformed pattern was performed using ultra high-power UV light. The deformation of the pattern into tulip-like shapes with increased surface roughness was confirmed by microscopy, and contact angle measurement was performed to confirm omni-phobicity. The final cured imprinted samples showed water and oil contact angles reaching 169.2° and 115°, respectively, thus, the omni-phobic surface could be demonstrated by a tulip-shaped pattern imprinting process.
- Published
- 2021
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