Lithographic Design of Overhanging Microdisk Arrays Toward Omniphobic Surfaces

Kim, Ju Hyeon; Shim, Tae Soup; Kim, Shin‐Hyun

doi:10.1002/adma.201503643

Cited by 60 publications

(48 citation statements)

References 32 publications

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“…Recently, Voit and co‐workers developed singly re‐entrant superomniphobic surfaces from thermoresponsive shape memory polymer . Kim and co‐workers have made a lot of efforts in preparing doubly re‐entrant nanostructures based on polymers . However, these polymer‐derived re‐entrant structures inevitably demand a further surface fluorination and even so, it is still difficult for these polymer structures to repel those fluorinated liquids.…”

mentioning

confidence: 99%

3D Printing of Bioinspired Liquid Superrepellent Structures

et al. 2018

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Bioinspired re-entrant structures have been proved to be effective in achieving liquid superrepellence (including anti-penetration, anti-adhesion, and anti-spreading). However, except for a few reports relying on isotropic etching of silicon wafers, most fluorination-dependent surfaces are still unable to repel liquids with extreme low surface energy (i.e., γ < 15 mN m ), especially those fluorinated solvents. Herein, triply re-entrant structures, possessing superrepellence to water (with surface tension γ of 72.8 mN m ) and various organic liquids (γ = 12.0-27.1 mN m ), are fabricated via two-photon polymerization based 3D printing technology. Such structures can be constructed both on rigid and flexible substrates, and the liquid superrepellent properties can be kept even after oxygen plasma treatment. Based on the prepared triply re-entrant structures, micro open capillaries are constructed on them to realize directional liquid spreading, which may be applied in microfluidic platforms and lab-on-a-chip applications. The fabricated arrays can also find potential applications in electronic devices, gas sensors, microchemical/physical reactors, high-throughput biological sensors, and optical displays.

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confidence: 99%

3D Printing of Bioinspired Liquid Superrepellent Structures

et al. 2018

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“…Compared with pure water, biological fluids contain complex bio‐ and chemical molecules, resulting in relatively low surface tension and thus tend to contaminate surfaces . Recent researches have demonstrated the advantages of tailoring surfaces with re‐entrant geometry (or convex topography) to obtain superoleophobicity that can repel low surface tension liquids such as organic solvents or oils . The unique overhanging structures of re‐entrant geometry can efficiently hold the liquids at the edges and prevent further liquid penetration.…”

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confidence: 99%

Self‐Cleaning Ultraviolet Photodetectors Based on Tree Crown‐Like Microtube Structure

Tian

Liu

et al. 2018

Adv Materials Inter

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Photodetectors are extensively applied in a wide range of applications. In particular, hierarchical ZnO micro/nanostructure has achieved promising success in the fields of advanced photodetectors. By utilizing hierarchical structure, development of functional photodetectors with self‐cleaning properties would extend the applications of photodetectors in more severe environments. Recent reports have demonstrated the advantages of nanofabricated surfaces with re‐entrant geometry to obtain superoleophobicity that can repel low surface tension liquids such as biofluids or oils. Inspired by the excellent liquid repellency of re‐entrant geometry, here a self‐cleaning ultraviolet photodetector is reported based on tree crown‐like microtube (TCLMT) structure. The TCLMT consisted of a ZnO microtube‐trunk structure branched with numerous ZnO nanospikes on top, presenting a re‐entrant geometry that effectively repelled water and various biological fluids. The TCLMT is fabricated using a microporous membrane‐templated method, followed by multiple steps of material deposition, plasma etching, and hydrothermal growth. The fluorinated ZnO TCLMT‐based photodetector exhibits excellent photoelectric performance as well as resistance against biofouling solution such as bacterial suspension. This work provides a versatile approach to achieve controlled fabrication of re‐entrant structures with excellent liquid repellent properties as well as extending ZnO‐based photodetectors to be self‐cleaning and resistant to biofouling.

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“…Recent developments in bioinspired surfaces with superwettability opened new opportunities for wound dressings 14–19. By articulating the reentrant architecture of the surface, hydrophobic, even omniphobic, surfaces can be achieved using hydrophilic polymers 20–23.…”

Section: Introductionmentioning

confidence: 99%

Omniphobic ZIF‐8@Hydrogel Membrane by Microfluidic‐Emulsion‐Templating Method for Wound Healing

Yao

Zhu

et al. 2020

Adv Funct Materials

175

135

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Bacterial adhesion and colonization can result in chronic non‐healing wounds. Current hydrophilic wound dressings can release antibacterial agents into the wound exudate, but may result in overhydrated wounds, bacterial overgrowth, and even tissue maceration. Hydrophobic dressings are anti‐fouling, though ineffective to encapsulate and release bactericidal agents. Combining the advantages of hydrophilic and hydrophobic dressings seems difficult, until the development of superwettability surfaces offers an opportunity for omniphobic dressings from intrinsic hydrophilic polymers. Herein, omniphobic porous hydrogel wound dressings loaded with a zinc imidazolate framework 8 (ZIF‐8) are fabricated by a microfluidic‐emulsion‐templating method. The fabricated porous hydrogel membrane with its reentrant architecture is repellent to blood and body fluids, though intrinsically hydrophilic. This unique combination not only reduces the adhesion of harmful microbes, but also enables the encapsulation and release of antibacterial ingredients to wounded sites from hydrophilic polymer networks. As such, the omniphobic metal‐organic frameworks (MOFs)@hydrogel porous wound dressing can inhibit bacteria invasion and enable the controlled release of the bactericidal, anti‐inflammatory, and nontoxic zinc ions. Furthermore, in vivo study of infected full‐thickness skin defect models demonstrates that the dressing also accelerates wound closure by promoting angiogenesis and collagen deposition. Therefore, the omniphobic MOFs@hydrogel porous wound dressings are potentially useful for clinical application.

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Lithographic Design of Overhanging Microdisk Arrays Toward Omniphobic Surfaces

Cited by 60 publications

References 32 publications

3D Printing of Bioinspired Liquid Superrepellent Structures

3D Printing of Bioinspired Liquid Superrepellent Structures

Self‐Cleaning Ultraviolet Photodetectors Based on Tree Crown‐Like Microtube Structure

Omniphobic ZIF‐8@Hydrogel Membrane by Microfluidic‐Emulsion‐Templating Method for Wound Healing

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