“…The PUA resin was cured with ultraviolet (UV) light (λ = 365 nm) for few seconds. The detailed UV NIL process has been described in our previous work 30 , 46 . Figure 5 The two-step replication process of Allium seed surfaces.…”
Biological surfaces in plants are critical for controlling essential functions such as wettability, adhesion, and light management, which are linked to their adaptation, survival, and reproduction. Biomimetically patterned surfaces replicating the microstructures of plant surfaces have become an emerging tool for understanding plant–environment interactions. In this study, we developed a two-step micro-replication platform to mimic the microstructure of seed surfaces and demonstrated that this initial platform can be used to study seed surface–environment interactions. The two-step process involved the extraction of a simplified seed surface model from real seeds and micro-replication of the simplified seed surface model using nanoimprint lithography. Using Allium seeds collected from Mongolia and Central Asia as the model system, we studied the wettability of biological and synthetic seed surfaces. We could independently control the material properties of a synthetic seed surface while maintaining the microstructures and, thereby, provide clear evidence that Allium seed surfaces were highly wettable owing to the high surface energy in the epidermal material rather than a microstructural effect. We expect that this platform can facilitate study of the independent effect of microstructure on the interaction of seed surfaces with their surroundings and contribute to research on the evolution of plant–environment interactions.
“…The PUA resin was cured with ultraviolet (UV) light (λ = 365 nm) for few seconds. The detailed UV NIL process has been described in our previous work 30 , 46 . Figure 5 The two-step replication process of Allium seed surfaces.…”
Biological surfaces in plants are critical for controlling essential functions such as wettability, adhesion, and light management, which are linked to their adaptation, survival, and reproduction. Biomimetically patterned surfaces replicating the microstructures of plant surfaces have become an emerging tool for understanding plant–environment interactions. In this study, we developed a two-step micro-replication platform to mimic the microstructure of seed surfaces and demonstrated that this initial platform can be used to study seed surface–environment interactions. The two-step process involved the extraction of a simplified seed surface model from real seeds and micro-replication of the simplified seed surface model using nanoimprint lithography. Using Allium seeds collected from Mongolia and Central Asia as the model system, we studied the wettability of biological and synthetic seed surfaces. We could independently control the material properties of a synthetic seed surface while maintaining the microstructures and, thereby, provide clear evidence that Allium seed surfaces were highly wettable owing to the high surface energy in the epidermal material rather than a microstructural effect. We expect that this platform can facilitate study of the independent effect of microstructure on the interaction of seed surfaces with their surroundings and contribute to research on the evolution of plant–environment interactions.
“…17 The wettability of the surface has strong dependencies on the material surface morphology and surface energy. 18,19 A rough surface with micro-nano hierarchical structures may trap air to form many "air bags", 20,21 while surface modifications with a low surface energy material endow strong water-repellency capability. 22 If a metallic surface exhibits superhydrophobicity, the surface can effectively be isolated from corrosion media, thus reducing the corrosion rate.…”
Section: Introductionmentioning
confidence: 99%
“…The hierarchical structure was devastated after 10 abrasion cycles under 370 kPa against 2000 grit sandpaper. Kim et al 21 created hydrophobic surfaces via imprinted micropillars, walls, and wall-pillar patterns using a polyurethane acrylate resin. Similarly, Kang 27 presented superhydrophobic surfaces through an array of mushroom-like micropillars using polydimethylsiloxane (PDMS).…”
Section: Introductionmentioning
confidence: 99%
“…The superhydrophobic surface refers to a solid surface with a static water contact angle greater than 150° . The wettability of the surface has strong dependencies on the material surface morphology and surface energy. , A rough surface with micro-nano hierarchical structures may trap air to form many “air bags”, , while surface modifications with a low surface energy material endow strong water-repellency capability …”
Superhydrophobic metallic surfaces with mechanical stability as well as self-cleaning and anticorrosion functions are highly desirable because of their promising applications in various aspects. Large apparent water contact angles (≥150°) on metal surfaces are usually realized by high surface roughness and low surface energy. However, rough nanoscale features and low-energy coatings are prone to wear, causing degradation of the local wetting property during service. Herein, we develop a low-cost and scalable fabrication methodology to prepare composite superhydrophobic surfaces (water contact angle ∼154.7± 2.3°and sliding angle ∼1.2 ± 0.2°) by integrating a micropatterned amorphous alloy frame with functionalized nanoparticles. Amorphous interconnected microwalls provide augmented resistance against abrasion, whereas spray-coated nanomaterials residing within the frame impart water repellency. Metallic surfaces can withstand abrasion against sandpaper for 40 m under a local pressure of 120 kPa, before losing their perfect superhydrophobic performances. The composite surfaces also maintain its water repellency after mechanical bending, knife scratching, water impact jetting, ultraviolet (UV) irradiation, and acid immersion. We envisage that the design strategies here provide a practical route to manufacture water-repellent surfaces with metallic glass in harsh nautical applications.
“…They studied the ways to improve productivity while reducing the line width with flexible cliché using a UV curable polymer and the nanoimprint lithography (NIL) process. [ 37–41 ] Furthermore, Kim et al [ 42 ] fabricated organic thin‐film transistors with a reverse offset printed Ag metal source/drain electrode pattern. In their ROP process, the features printed using ROP are determined by the cliché.…”
Reverse offset printing (ROP) is receiving increasing attention as an emerging technology for printed electronics due to its rapid, environment‐friendly fabrication processes. A tunable ROP process is proposed by exploiting the controlled elastic deformation of a stretchable blanket. First, the flat elastomeric blanket is elastically stretched before coating with the printing ink. Next, Ag ink is coated on the surface of a supporting substrate and sequentially transferred to a prestrained elastomeric blanket. Second, the patterned cliché is rolled over the prestrained blanket surface by applying an optimized pressure for patterning. Finally, releasing the strain in the patterned elastomeric blanket leads to a pattern deformation on pitch and sizes. A decrease in the line width and pitch is demonstrated using a tunable ROP process with a stretchable blanket. This unique tunable printing process offers the capability of low‐cost fabrication of various microstructures from a single cliché using simple mechanical stretching and releasing.
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