A Bioinspired Hierarchical Underwater Superoleophobic Surface with Reversible pH Response

Huang, Xia; Mutlu, Hatice

doi:10.1002/admi.202000101

Cited by 14 publications

(15 citation statements)

References 65 publications

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“…Our poly(HEMA- co- AA- co- MAA) films had an experimentally determined pKa value of 5.08, which is slightly higher than the individual pKa values of poly(acrylic acid) (pKa 4.5) and poly(methacrylic acid) (pKa 4.8) . For pH values below the pKa of the hydrogel, green color was observed, while a gradual redshift in color was seen for pH values above the pKa (Figure A–D).…”

Section: Results and Discussionmentioning

confidence: 72%

“…48,49 Our poly(HEMA-co-AA-co-MAA) films had an experimentally determined pKa value of 5.08, which is slightly higher than the individual pKa values of poly(acrylic acid) (pKa 4.5) 50 and poly(methacrylic acid) (pKa 4.8). 51 For pH values below the pKa of the hydrogel, green color was observed, while a gradual redshift in color was seen for pH values above the pKa (Figure 6A−D). These results are expected because the carboxyl groups exist in their neutral, protonated state under low-pH (< pKa) conditions and exhibit minimal swelling.…”

Section: Morphological Characterization Of Micropatternedmentioning

confidence: 94%

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A Robust Fabrication Technique for Hydrogel Films Containing Micropatterned Opal Structures via Micromolding and an Integrated Evaporative Deposition-Photopolymerization Approach

et al. 2021

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Opal-structured thin-film hydrogel materials with micropatterns hold great potential for utility in a wide range of sensing applications. Micropatterning offers key advantages such as ready addressability, high throughput assay, and multiplexing. However, controlled fabrication of such films in a rapid, inexpensive, and reliable manner remains a challenge. Existing techniques suffer from long opal deposition times and often involve complex and arduous steps. In this report, we examined a simple micromolding-based evaporation-polymerization method for the fabrication of poly(ethylene glycol)-based hydrogel films containing micropatterned opal structures. Specifically, intense and uniform opalescent colors were achieved by evaporative deposition of polystyrene bead solution in patterned micromolds. These opal micropatterns were then captured in hydrogel films by simple photopolymerization of a UV-curable PEG diacrylate solution. The as-prepared films show high tunability as well as responsiveness to various environmental cues readily manifested via shifts in color. Combined with UV–vis reflectance spectroscopy and scanning electron microscopy results, these findings illustrate the robust, simple, and reliable nature of our integrated deposition-polymerization approach for controlled fabrication of optically active and stimuli-responsive functional materials. We thus envision that the results and the facile approach reported here can be extended to many application areas including environmental monitoring, diagnostics, and biosensing applications.

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Section: Results and Discussionmentioning

confidence: 72%

Section: Morphological Characterization Of Micropatternedmentioning

confidence: 94%

A Robust Fabrication Technique for Hydrogel Films Containing Micropatterned Opal Structures via Micromolding and an Integrated Evaporative Deposition-Photopolymerization Approach

et al. 2021

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“…Inspired by the micro/nano-structure of fish scale, Huang et al [150] prepared a pH-responsive underwater superoleophobic film by combining in situ anodic aluminium oxide (AAO) template polymerization and polymerization modification (figure 12d). The surface of the film was composed of polypentafluorophenyl acrylate micropillars grafted with polymethacrylic acid nano-brushes.…”

Section: Ph-responsive Surfacesmentioning

confidence: 99%

Stimuli-responsive surfaces for switchable wettability and adhesion

et al. 2021

J. R. Soc. Interface.

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Diverse unique surfaces exist in nature, e.g. lotus leaf, rose petal and rice leaf. They show similar contact angles but different adhesion properties. According to the different wettability and adhesion characteristics, this review reclassifies different contact states of droplets on surfaces. Inspired by the biological surfaces, smart artificial surfaces have been developed which respond to external stimuli and consequently switch between different states. Responsive surfaces driven by various stimuli, e.g. stretching, magnetic, photo, electric, temperature, humidity and pH, are discussed. Studies reporting on either atmospheric or underwater environments are discussed. The application of tailoring surface wettability and adhesion includes microfluidics/droplet manipulation, liquid transport and harvesting, water energy harvesting and flexible smart devices. Particular attention is placed on the horizontal comparison of smart surfaces with the same stimuli. Finally, the current challenges and future prospects in this field are also identified.

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“…Hence, exploring antifouling coatings that release antifoulant as required, especially at low-speed and at anchor states, is a critical guide for the future. Because the secretions such as acetic acid and lactic acid produced by bacterial metabolisms can decrease the pH of the microenvironment to acidic (Qian et al, 2007a;Traba and Liang, 2015;Hao et al, 2019;Saadouli et al, 2021), pH-responsive antifouling coatings have attracted increasing attention and developed rapidly in recent years (Hao et al, 2019;Hao et al, 2020;Huang et al, 2020;Xu et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

pH-Responsive Allicin-Based Coatings With Antibacterial and Antifouling Effects in Marine Environments

et al. 2022

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In this work, we report the design of pH-controlled releasing behaviors of polydopamine/tannic acid-allicin@chitosan (PDA/TA-ALL@CS) multilayer coatings to realize antibacterial and antifouling effects. The pH-responsive ALL@CS capsules were prepared using the microemulsion method with about 262–452 nm diameter. The bacteriostasis of ALL@CS microcapsules against E. coli, S. aureus, and P. aeruginosa all exceeded 94% as evaluated using the colony counting method. Because of the protonation in acid environments and deprotonation in alkaline environments for the amino groups of CS, ALL as biocides can be released from the nanocapsules and exert outstanding antibacterial properties. Confirmed by the plate colony counts, the ALL@CS capsules possessed an outstanding antibacterial effect for E. coli in acid solutions but were less effective in alkaline solutions. The PDA/TA-ALL@CS-7 coatings showed durable pH-responsive antibacterial activities with an efficiency of ∼87% after immersion in pH 8 solutions for seven days. The PDA/TA-ALL@CS coating with controlled release performance and antibacterial properties may provide a new solution for developing antifouling coating applications in the marine environment.

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A Bioinspired Hierarchical Underwater Superoleophobic Surface with Reversible pH Response

Cited by 14 publications

References 65 publications

A Robust Fabrication Technique for Hydrogel Films Containing Micropatterned Opal Structures via Micromolding and an Integrated Evaporative Deposition-Photopolymerization Approach

A Robust Fabrication Technique for Hydrogel Films Containing Micropatterned Opal Structures via Micromolding and an Integrated Evaporative Deposition-Photopolymerization Approach

Stimuli-responsive surfaces for switchable wettability and adhesion

pH-Responsive Allicin-Based Coatings With Antibacterial and Antifouling Effects in Marine Environments

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