Surface modification of a polyurethane film by low pressure glow discharge oxygen plasma treatment

Sanchis, M.R.; Calvo, Óscar Seco; Fenollar, O.; García, David; Balart, Rafael

doi:10.1002/app.26250

Cited by 60 publications

(58 citation statements)

References 81 publications

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“…Although the oxygen plasma treatment enhances the wetting contrast, it also tends to slightly alter the morphology of creases and the wettability patterns (Fig. S10), probably due to changes in the surface roughness, surface energy, and the mechanical properties of the polyurethane induced by the oxygen plasma (48,49).…”

Section: Resultsmentioning

confidence: 99%

Spontaneous wettability patterning via creasing instability

Chen

McKinley

Cohen

2016

Proc. Natl. Acad. Sci. U.S.A.

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Surfaces with patterned wettability contrast are important in industrial applications such as heat transfer, water collection, and particle separation. Traditional methods of fabricating such surfaces rely on microfabrication technologies, which are only applicable to certain substrates and are difficult to scale up and implement on curved surfaces. By taking advantage of a mechanical instability on a polyurethane elastomer film, we show that wettability patterns on both flat and curved surfaces can be generated spontaneously via a simple dip coating process. Variations in dipping time, sample prestress, and chemical treatment enable independent control of domain size (from about 100 to 500 μm), morphology, and wettability contrast, respectively. We characterize the wettability contrast using local surface energy measurements via the sessile droplet technique and tensiometry.wettability contrast | creasing instability | domain size | morphology | curved surfaces S urfaces that juxtapose local hydrophilic areas with hydrophobic areas show superior performance compared with surfaces with homogeneous wettability in many industrial applications including heat transfer (1), water collecting (2-6), particle separation (7), and microfluidics (8). For instance, developing enhanced water-collecting efficiency has been inspired by the Namib desert beetle, which was reported (2) to have hydrophilic bumps on an overall wax-covered hydrophobic surface. Although the hydrophilic bumps reduce the nucleation/coalescence energy of microdroplets, the overall hydrophobic character of the surface facilitates the spontaneous shedding of water droplets when they grow beyond a certain size.To achieve surfaces with wettability patterning, traditional fabrication methods such as photolithography and soft lithography have been used. However, these methods are generally not cost-effective, not readily scaled up, require multiple process steps, and are difficult to implement on curved surfaces (3, 9). Recently, mechanical instabilities have been explored as a facile self-assembly approach to endow surfaces with superhydrophobicity (10-12), superhydrophilicity (13), or anisotropic wettability (14). Although mechanical self-assembly provides a low cost route for spontaneous generation of surface patterns, explorations to date have been focused on introducing surface roughness via wrinkling and crumpling instabilities. Here we show that surfaces can be spontaneously patterned with chemical patches with small changes in surface roughness by harnessing a reversible creasing instability (15-17).A creasing instability develops when a soft polymer network is placed under mechanical compression beyond a certain critical strain, at which point sharp folds spontaneously develop and grow on the deformable free surfaces (18). This process has been linked to the morphology development of the brain (19,20), electric breakdown of dielectric elastomers (21), and has also been harnessed to prepare switchable surfaces actuated by temperature (22) or electric ...

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Section: Resultsmentioning

confidence: 99%

Spontaneous wettability patterning via creasing instability

Chen

McKinley

Cohen

2016

Proc. Natl. Acad. Sci. U.S.A.

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“…2B). The highly reactive oxygen species generated during the low-pressure plasma process are known to react with the various surface groups, generating mostly hydrophilic groups (19) that can reduce an initial surface chemical gradient. We found that the difference in fluorescence peak wavelength between the tops and bottoms of the ridges was significantly removed after the plasma treatment, indicating significant loss of the initial polarity gradient.…”

Section: Resultsmentioning

confidence: 99%

Discovery of the surface polarity gradient on iridescent Morpho butterfly scales reveals a mechanism of their selective vapor response

Potyrailo

Starkey

Vukusic

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

101

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Significance Morpho butterflies are a brilliant spectacle of nature’s capability for photonic engineering. Their conspicuous appearance arises from the interference and diffraction of light within tree-like nanostructures on their scales. Scientific lessons learned from these butterflies have already inspired designs of new displays, fabrics, and cosmetics. This study reports a vertical surface polarity gradient in these tree-like structures. This biological pattern design may be applied to numerous technological applications ranging from security tags to self-cleaning surfaces, gas separators, protective clothing, and sensors. Here it has allowed us to unveil a general mechanism of selective vapor response in photonic Morpho nanostructures and to demonstrate attractive opportunities for chemically graded sensing units for high-performance sensing.

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“…From these results, it can be concluded that the plasma attacks C u C bonds in the polypropylene chains to form various carbon oxygen bonds, such oxygen-containing groups are known to substantially improve the hydrophilic properties of polymeric materials. 1, 21,22 Results in Figs. 4 and 5 are, therefore, very desirable.…”

mentioning

confidence: 97%

“…21 A large shift in the O / C ratio is a clear indication that surface functionalization is being induced through the interlock of oxygen based polar species resulting from the interaction of the film surface with the species present in the gas discharge. 22 Figure 5 gives a detailed XPS spectrum of the C 1s peak to allow analysis of the oxygen-containing functional groups formed through polymer-plasma interaction. It is clear that exposure to the pulsed air plasma significantly reduces the C 1s peak at 285 eV.…”

mentioning

confidence: 99%

10 ns pulsed atmospheric air plasma for uniform treatment of polymeric surfaces

Walsh

Kong

2007

Applied Physics Letters

169

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This letter reports an experimental study of a 10ns pulsed dielectric barrier discharge in atmospheric air, excited with a train of 65ns voltage pulses at a repetition frequency of 5kHz. It is shown that these ultrashort pulses produce a homogenous discharge with very high electron density in excess of 1013cm−3 and low gas temperature, which are particularly desirable for uniform treatment of thermally sensitive polymer films. Their treatment of polypropylene films is found to introduce microscale surface patterns as well as various carbon-oxygen bonds, both useful for improving the hydrophilic properties of polymeric materials.

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Surface modification of a polyurethane film by low pressure glow discharge oxygen plasma treatment

Cited by 60 publications

References 81 publications

Spontaneous wettability patterning via creasing instability

Spontaneous wettability patterning via creasing instability

Discovery of the surface polarity gradient on iridescent Morpho butterfly scales reveals a mechanism of their selective vapor response

10 ns pulsed atmospheric air plasma for uniform treatment of polymeric surfaces

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