Design and Fabrication of Zwitter-Wettable Nanostructured Films

Lee, Hyomin; Gilbert, Jonathan B.; Angilè, Francesco E.; Yang, Rong; Lee, Daeyeon; Rubner, Michael F.; Cohen, Robert E.

doi:10.1021/am508157m

Cited by 65 publications

(76 citation statements)

References 24 publications

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“…[1][2][3][4] Over the last few decades, an extensive research studies have been reported to prevent the formation of fog and frost on solid surfaces by different approaches including superhydrophobic coatings, 5-7 superhydrophilic coatings 8,9 and combinations of both hydrophilic and hydrophobic properties in the coating. [10][11][12][13][14][15] Hydrophilic surfaces that have a water contact angle of less than 5 o exhibit excellent anti-fog properties because they allow water droplets to spread uniformly to form a thin water film, which reduces light scattering. 9,16,17 In general, superhydrophilicity can be obtained by various chemical and physical methods.…”

Section: Introductionmentioning

confidence: 99%

Zwitterionic polymer brush coatings with excellent anti-fog and anti-frost properties

Ezzat

Huang

2016

RSC Adv.

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The formation of fog and frost on transparent surfaces can lead to many problems in our daily life. To address these problems, polymer brushes based on two zwitterionic analogues, poly(sulfobetaine methacrylate) (pSBMA) and poly(sulfobetaine vinylimidazole) (pSBVI), have been prepared by surface-initiated atom transfer radical polymerization (SI-ATRP). Hydrophilic and superhydrophilic pSBMA and pSBVI polymer brushes were prepared by controlling the thickness of the coatings to study the effect of wettability on the anti-fog and anti-frost properties. X-ray photoelectron spectroscopy (XPS), ellipsometry and atomic force microscopy (AFM) were respectively used to determine the interfacial elemental composition, the thickness and the morphology of the brushes. The wettability of the polymer brushes was measured using a water contact angle goniometer. Their anti-fog and anti-frost capabilities were determined visually and tested quantitatively by UV-vis spectroscopy. The results indicated that the optical transmittance of substrates modified with superhydrophilic polymer coatings under both hot and cold fogging conditions was very high. Additionally, no visible frost was formed on the superhydrophilic substrates after storage in a freezer at -20 o C for the duration of the experiment. These results convincingly demonstrated that the resistance of the modified substrates to fogging and frosting is strongly correlated to the surface wettability. Moreover, there is no considerable difference in the performance of pSBMA and pSBVI polymer brushes, but the former is preferred because SBMA monomer is commercially available and requires short polymerization time to obtain superhydrophilicity.

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Section: Introductionmentioning

confidence: 99%

Zwitterionic polymer brush coatings with excellent anti-fog and anti-frost properties

Ezzat

Huang

2016

RSC Adv.

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“…One approach, the so‐called the hydrophilicity‐induced antifogging or the wet‐style antifogging, relies on modification of a substrate with hydrophilic materials, which can avoid fogging by strongly interacting with water molecules. [ 4,5 ] When this high affinity for water is synergistically combined with nanotexture, a superhydrophilic surface is generated; this surface exhibits extremely low water contact angle (<5°) and induces film‐wise condensation via capillary condensation upon temperature difference, maintaining excellent optical properties under fogging conditions. [ 6 ] However, when the amount of water condensed exceeds the capacity of the film, the flooded water layer on top causes substantial image distortion.…”

Section: Figurementioning

confidence: 99%

“…Alternatively, zwitter‐wettable films that simultaneously exhibit hydrophobicity and hygroscopic properties have been proposed. [ 5 ] These heterostructured films comprise a hydrophilic reservoir and a nanoscale thin hydrophobic capping layer in which the water vapor can readily permeate through and interact with the underlying hydrophilic reservoir. While the zwitter‐wettability allows water vapor to preferably condense into the hydrophilic reservoir instead of the surface to exhibit antifogging property, the combination of surface hydrophobicity and high water vapor permeability is inevitably accompanied by high water contact angle hysteresis.…”

Section: Figurementioning

confidence: 99%

Wet‐Style Superhydrophobic Antifogging Coatings for Optical Sensors

et al. 2020

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Transparent substrates are widely used for optical applications from lenses for personal and sports eyewear to transparent displays and sensors. While these substrates require excellent optical properties, they often suffer from a variety of environmental challenges such as excessive fogging and surface contamination. In this work, it is demonstrated that a wet‐style superhydrophobic coating, which simultaneously exhibits antifogging, antireflective, and self‐cleaning properties, can be prepared by pattern transferring low‐surface‐energy microstructures onto a heterostructured nanoscale thin film comprising polymers and silica nanoparticles. The polymer–silica nanocomposite base layer serves as a hydrophilic reservoir, guiding the water molecules to preferentially condense into this underlying region and suppress reflection, while the low‐surface‐energy microstructure enables contaminants adsorbed on the surface to be easily removed by rinsing with water.

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“…Therefore, the catechol is important for strong wet adhesion. Many interesting methods based on catechol have been developed to modify almost all types of surfaces, and it is a universal method . Most of the reported works are coated with DA only, followed by another reaction, such as alkali treatment .…”

Section: Introductionmentioning

confidence: 99%

“…The water can potentially weaken the interactions between polymers and surfaces. Fortunately, catechol‐functionalized polymers can enhance the surface adhesion and enable a mechanically robust coating tightly on the surface of the intrinsic hydrophobic polymers . This is of particular interest for practical applications.…”

Section: Introductionmentioning

confidence: 99%

Mussel‐inspired catechol‐based chemistry for direct construction of super‐hydrophilic and waterproof coatings on intrinsic hydrophobic surfaces

Zhang

Wang

Jiang

et al. 2019

J of Applied Polymer Sci

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Super‐hydrophilic coatings are useful in many applications such as agricultural greenhouses. However, the direct modification of super‐hydrophilic coatings on intrinsic hydrophobic surfaces is still a challenge, particularly without any pretreatment. Here, highly transparent super‐hydrophilic and waterproof coatings on intrinsic hydrophobic surfaces were prepared via layer‐by‐layer (LbL) assembly catechol‐grafted polymer‐branched poly(ethylenimine) (bPEI)‐3‐(3,4‐dihydroxyphenyl)propionic acid (denoted as C) and poly(acrylic acid) (PAA)‐dopamine (denoted as D) inspired by the mussel. The catechol‐functionalized polymer facilitates a mechanically robust coating that is tightly attached to the surface of the intrinsic hydrophobic polymers. This gives the coating excellent antifogging ability with a lowest contact angle of 0°. These coatings also demonstrated excellent stability after cross‐linking with Fe3+ or alkali species. The super‐hydrophilic and waterproof coatings on intrinsic hydrophobic surfaces can also be prepared by the spray method. The super hydrophilic coating exhibits favorable antifogging ability, making it potentially useful in numerous applications. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48013.

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Design and Fabrication of Zwitter-Wettable Nanostructured Films

Cited by 65 publications

References 24 publications

Zwitterionic polymer brush coatings with excellent anti-fog and anti-frost properties

Zwitterionic polymer brush coatings with excellent anti-fog and anti-frost properties

Wet‐Style Superhydrophobic Antifogging Coatings for Optical Sensors

Mussel‐inspired catechol‐based chemistry for direct construction of super‐hydrophilic and waterproof coatings on intrinsic hydrophobic surfaces

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