Reliable and Robust Fabrication Rules for Springtail-Inspired Superomniphobic Surfaces

Kang, Seong Min; Choi, Ji Seong; An, Joon Hyung

doi:10.1021/acsami.0c03986

Cited by 11 publications

(7 citation statements)

References 38 publications

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“…Several studies have been conducted on mimicking this unique microstructure surface, most of which were focused on rigid microstructures; ,− however, only a few elastomeric Dual-T structures have been proposed. ,− Kim et al obtained the PDMS Dual-T surface through a two-step fabrication method. In the first step, the umbrella-like re-entrant (T) structures were made by a photolithography-based molding process. ,, In the second step, the thin cap edges of the T microstructures were bent by vacuum vapor deposition of an aluminum film onto the microstructures, creating the downward overhangs with a maximum bending angle of 84°.…”

Section: Introductionmentioning

confidence: 99%

One-Step Fabrication of Flexible Bioinspired Superomniphobic Surfaces

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

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Flexible superomniphobic doubly re-entrant (Dual-T) microstructures inspired by springtails have attracted growing attention due to their excellent liquid-repellent properties. However, the simple and practical manufacturing processes of the flexible Dual-T microstructures are urgently needed. Here, we proposed a one-step molding process coupled with the lithography technique to fabricate the elastomeric polydimethylsiloxane (PDMS) Dual-T microstructure surfaces with high uniformity. The angle between the downward overhang and the horizontal direction could reach 90° (vertical overhang). The flexible superomniphobic Dual-T microstructure surfaces, without fluorination treatment and physical treatments, could repel liquids with a surface tension lower than 20 mN m–1 in the Cassie–Baxter state. Owing to the excellent robustness of the one-step molding downward overhanging, the max breakthrough pressure of this surface could reach up to 164.3 Pa for ethanol droplets. Furthermore, the flexible superomniphobic Dual-T surface allowed impinging ethanol droplets to completely rebound at the Weber number up to 7.1 with an impact velocity of ∼0.32 m s–1. The Dual-T microstructure surface maintained excellent superomniphobicity even after surface oxygen plasma treatment and exhibited excellent structural robustness and recoverability to various large mechanical deformations.

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Section: Introductionmentioning

confidence: 99%

One-Step Fabrication of Flexible Bioinspired Superomniphobic Surfaces

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

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“…PDMS and other silicones are also widely used in micro‐ and nano‐applications due to outstanding hydrophobicity and strippability. Recently, silicone structures with various properties were fabricated using molding techniques, and new functionality is expected to be implemented 4,5 …”

Section: Introductionmentioning

confidence: 99%

“…Recently, silicone structures with various properties were fabricated using molding techniques, and new functionality is expected to be implemented. 4,5 On the other hand, there are important fields where silicones are used in the form of thin films. Normally, films can be deposited on arbitrary substrates by spin coating of liquid silicones.…”

Section: Introductionmentioning

confidence: 99%

Formation of silicone thin films by ArF excimer laser induced photo‐desorption

Okoshi

2022

Elect Comm in Japan

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Low molecular weight silicones were ejected from silicone rubber target irradiated by a 193 nm ArF excimer laser through the photo-desorption. The ejected silicones were successfully deposited on a fused silica glass substrate in air. An approximately 0.3 mm of the target-substrate distance was required for the deposition. The deposited silicones became a thin film, showing an interference color when the ArF excimer laser was irradiated for a long time. Chemical bonding state of the formed thin films was analyzed by the Fourier transform infrared spectroscopy. The thin films were slightly different from the original silicone rubber structure, still it was composed of Si-O-Si bonds and Si-CH 3 bonds. Also, OH bonds were clearly produced in the silicone thin films. As a result, contact angle of water on the silicone thin films was measured to be approximately 20 degrees, indicating a hydrophilic property.

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“…A surface that can repel liquids with both high (e.g., water) and low (e.g., oil) surface tension (γ lv ) has demonstrated potential for a wide range of practical applications including oil–water separation, − self-cleaning, , drag reduction, , and corrosion resistance , due to its extreme liquid repellency . Designing such a superomniphobic surface [i.e., a surface that displays apparent contact angles (θ*) greater than 150° and a roll-off angle (ω) less than 10° with virtually all liquids] involves a low-solid-surface-energy (γ sv ) coating along with surface roughness .…”

Section: Introductionmentioning

confidence: 99%

Water-Responsive Self-Repairing Superomniphobic Surfaces via Regeneration of Hierarchical Topography

et al. 2021

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Superomniphobic surfaces that can self-repair physical damage are desirable for sustainable performance over time in many practical applications that include self-cleaning, corrosion resistance, and protective gears. However, fabricating such self-repairing superomniphobic surfaces has thus far been a challenge because it necessitates the regeneration of both low-surface-energy materials and hierarchical topography. Herein, a water-responsive self-repairing superomniphobic film is reported by utilizing cross-linked hydroxypropyl cellulose (HPC) composited with silica (SiO2) nanoparticles (HPC-SiO2) that is treated with a low-surface-energy perfluorosilane. The film can repair physical damage (e.g., a scratch) in approximately 10 s by regenerating its hierarchical topography and low-surface-energy material upon the application of water vapor. The repaired region shows an almost complete recovery of its inherent superomniphobic wettability and mechanical hardness. The repairing process is driven by the reversible hydrogen bond between the hydroxyl (−OH) groups which can be dissociated upon exposure to water vapor. This results in a viscous flow of the HPC-SiO2 film into the damaged region. A mathematical model composed of viscosity and surface tension of the HPC-SiO2 film can describe the experimentally measured viscous flow with reasonable accuracy. Finally, we demonstrate that the superomniphobic HPC-SiO2 film can repair physical damage by a water droplet pinned on a damaged area or by sequential rolling water droplets.

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Reliable and Robust Fabrication Rules for Springtail-Inspired Superomniphobic Surfaces

Cited by 11 publications

References 38 publications

One-Step Fabrication of Flexible Bioinspired Superomniphobic Surfaces

One-Step Fabrication of Flexible Bioinspired Superomniphobic Surfaces

Formation of silicone thin films by ArF excimer laser induced photo‐desorption

Water-Responsive Self-Repairing Superomniphobic Surfaces via Regeneration of Hierarchical Topography

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