Nanofilms Produced by Magnetron Enhanced Plasma Polymerization from Methane and Oxygen for Coating of Rigid Contact Lenses

Bergmann, Michael; Ledernez, Loic; Dame, Gregory; Lickert, Sebastian; Widmer, Frank; Gier, Yvonne; Urban, G.

doi:10.1002/ppap.201300028

Cited by 11 publications

(5 citation statements)

References 34 publications

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“…As one might expect, these effects are dependent on the surface treatment conditions, material properties, and storage conditions. − Functional plasma polymer films (PPFs) denote a material that is created as a result of the passage of an organic gas through the glow discharge and is usually deposited in the form of a thin film . PPFs are used in diverse applications where stability and shelf life aging are important factors, such as drug release, tissue engineered implants, (blood) filtration, , contact lenses, , microfluidics, electrodes, and (bio)sensors . The usage of ultrathin PPFs is thus often limited by their stability in aqueous environments.…”

Section: Introductionmentioning

confidence: 99%

Composition and Stability of Plasma Polymer Films Exhibiting Vertical Chemical Gradients

et al. 2017

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Controlling the balance between stability and functional group density in grown plasma polymer films is the key to diverse applications such as drug release, tissue-engineered implants, filtration, contact lenses, microfluidics, electrodes, sensors, etc. Highly functional plasma polymer films typically show a limited stability in air or aqueous environments due to mechanisms like molecular reorganization, oxidation, and hydrolysis. Stabilization is achieved by enhancing cross-linking at the cost of the terminal functional groups such as -OH and -COOH, but also -NH, etc. To overcome such limitations, a structural and chemical gradient was introduced perpendicular to the surface plane; this vertical gradient structure is composed of a highly cross-linked base layer, gradually changing into a more functional nanoscaled surface termination layer. This was achieved using CO/CH discharges with decreasing power input and increasing gas ratio during plasma polymer deposition. The aging behavior and stability of such oxygen-functional vertical gradient nanostructures were studied in air and in different aqueous environments (acidic pH 4, neutral pH ≈ 6.2, and basic pH 10). Complementary characterization methods were used, including angle-resolved X-ray photoelectron spectroscopy (ARXPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS) as well as water contact angle (WCA) measurements. It was found that in air, the vertical gradient films are stabilized over a period of months. The same gradients also appear to be stable in neutral water over a period of at least 1 week. Changes in the oxygen depth profiles have been observed at pH 4 and pH 10 showing structural and chemical aging effects on different time scales. The use of vertical gradient plasma polymer nanofilms thus represents a novel approach providing enhanced stability, thus opening the possibility for new applications.

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Section: Introductionmentioning

confidence: 99%

Composition and Stability of Plasma Polymer Films Exhibiting Vertical Chemical Gradients

et al. 2017

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“…An interesting alternative is to use mixtures of “simpler” hydrocarbon (CH 4 , C 2 H 2 , C 2 H 4 , …) and non‐polymerizable “reactive” gases (O 2 , CO 2 , N 2 , NH 3 , …). For example, the coating of contact lenses using mixtures of CH 4 and O 2 (or air) is an established process . For the deposition of O‐containing functional films, plasma polymerization of both acrylic acid (H 2 CCHCOOH) and CO 2 /C 2 H 4 mixtures were shown to yield comparable results over a range of deposition conditions …”

Section: Introductionmentioning

confidence: 99%

Deposition of Plasma Polymer Films from Acetylene and Water Vapor

Guimond

Hanselmann

Hossain

et al. 2014

Plasma Process. Polym.

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Oxygen-functional plasma polymers are of high interest in diverse fields such as, e.g., biomedical applications where stable surfaces are required, i.e., avoiding strong aging, leaching, and dissolution effects. Plasma polymer deposition from water vapor/acetylene mixtures is thus examined by varying energy input and gas ratio. Mainly, the latter was found to influence oxygen incorporation. Increasing the overall oxygen content in the plasma polymer films, however, results in film loss when immersed in water. Highly stable a-C:H:O films could be obtained for H 2 O/C 2 H 2 gas flow ratio around 5 at moderate energy input. Such films mainly comprise C-O-R groups as indicated by XPS and FTIR measurements.

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“…The idea behind this treatment is to enhance the wetting angle, resulting in a more hydrophilic lens surface. [12] Applying a plasma coating to soft contact lenses has been shown to enhance lens surface lubricity, which appears to be the principal contributor to comfort. [13]However, its effect on GP lens comfort has not been investigated.…”

Section: Discussionmentioning

confidence: 99%

Effect of large diameter and plasma coating on the initial adaptation of gas permeable contact lens fitting for neophytes

Dutta

Wolffsohn

2021

Contact Lens and Anterior Eye

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To determine whether the adaption of neophytes to rigid gas permeable lenses (RGPs) could be accelerated by changing their diameter or surface lubricity.Methods: This was a 2 part prospective double-masked randomised bilateral wear study. An RGP lens (Roflufocon D material, 9.6mm diameter) with and without a Hydrapeg plasma coating surface was worn by 119 neophytes (21.1±3.5 years; 77% female) on separate occasions. A further 114 neophytes (average age 20.1±1.0 years; 72% female) wore the uncoated lens with a randomly allocated 9.6mm diameter lens one one eye and 10.1mm (n=51) or 10.6mm (n=63) in the other with a basecurve compensation keeping the fit the same. Lens fit and corneal staining was assessed after 20 minutes, and comfort and bulbar redness were assessed at the time of lens application and after

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Nanofilms Produced by Magnetron Enhanced Plasma Polymerization from Methane and Oxygen for Coating of Rigid Contact Lenses

Cited by 11 publications

References 34 publications

Composition and Stability of Plasma Polymer Films Exhibiting Vertical Chemical Gradients

Composition and Stability of Plasma Polymer Films Exhibiting Vertical Chemical Gradients

Deposition of Plasma Polymer Films from Acetylene and Water Vapor

Effect of large diameter and plasma coating on the initial adaptation of gas permeable contact lens fitting for neophytes

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