Fluorination of poly(dimethylsiloxane) surfaces by low pressure CF4 plasma – physicochemical and antifouling properties

Cordeiro, Ana Lúcia Arcanjo Oliveira; Nitschke, Mirko; Janke, Andreas; Helbig, Ralf; D’Souza, F.; Donnelly, Glen; Willemsen, Peter R.; Werner, Carsten

doi:10.3144/expresspolymlett.2009.11

Cited by 56 publications

(38 citation statements)

References 44 publications

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“…Different parameters can affect the plasma treatment process including treatment time, gas flow, gas pressure, and RF power. However, it is reported that treatment time is the most influential parameter among others . For this purpose, PECVD was applied and contact angle measurement was conducted to investigate its effects on the skin layer of membranes after the modification.…”

Section: Resultsmentioning

confidence: 99%

“…However, it is reported that treatment time is the most influential parameter among others. 30,41 For this purpose, PECVD was applied and contact angle measurement was conducted to investigate its effects on the skin layer of membranes after the modification. PECVD is a chemical vapor deposition process used to deposit thin films from a gas state (vapor) to a solid state on a substrate.…”

Section: Effect Of Fluorination Modificationmentioning

confidence: 99%

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Development and tuning of Matrimid membrane oxygenators with improved biocompatibility and gas permeance by plasma treatment

Khosravifard

Hosseini

Boddohi

2019

J of Applied Polymer Sci

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In this study, a commercial polyimide is examined in the capacity of membrane oxygenator. The effects of polymer concentration, cosolvent, and nonsolvent additives in dope solution on the performance and morphology of membranes are investigated. In order to improve the performance, surface modification is carried out by using plasma‐enhanced chemical vapor deposition. The obtained results reveal that CO2 permeance decreased from 495 to 78 GPU upon increasing Matrimid concentration at constant tetrahydrofuran (THF) and ethanol (EtOH) concentrations. It was also found that increasing nonsolvent concentration as well as decreasing cosolvent concentration in dope led to increase in membrane gas permeance. According to morphological characterizations, increase in polymer concentration resulted in transformation of membranes from porous into spongy like microstructure with formation of a denser skin layer. In addition, membrane porosity and mean pore size reduced by increasing THF and decreasing EtOH concentrations. On the other hand, plasma treatment successfully introduced fluorine groups onto the membrane surface which promoted biocompatibility of the membranes. Energy‐dispersive X‐ray spectroscopy results revealed that fluorination of membrane surface was attained up to 23% and contact angle of membrane enhanced up to 120°. Membrane permeance was also increased slightly upon modification. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48824.

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Section: Resultsmentioning

confidence: 99%

Section: Effect Of Fluorination Modificationmentioning

confidence: 99%

Development and tuning of Matrimid membrane oxygenators with improved biocompatibility and gas permeance by plasma treatment

Khosravifard

Hosseini

Boddohi

2019

J of Applied Polymer Sci

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“…From this illustration, it can be concluded that it is relatively easy to assess or screen the performance of coatings for bacterial inhibition or release properties when compared to a reference. In addition, the assay was also briefly referred and illustrated for the assessment of other coating types [1,14,16].…”

Section: Discussionmentioning

confidence: 99%

Bacterial assay for the rapid assessment of antifouling and fouling release properties of coatings and materials

D’Souza¹,

Bruin²,

Biersteker³

et al. 2009

J Ind Microbiol Biotechnol

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An assay has been developed to accurately quantify the growth and release behaviour of bacterial biofilms on several test reference materials and coatings, using the marine bacterium Cobetia marina as a model organism. The assay can be used to investigate the inhibition of bacterial growth and release properties of many surfaces when compared to a reference. The method is based upon the staining of attached bacterial cells with the nucleic acid-binding, green fluorescent SYTO 13 stain. A strong linear correlation exists between the fluorescence of the bacterial suspension measured (RFU) using a plate reader and the total bacterial count measured with epifluorescence microscopy. This relationship allows the fluorescent technique to be used for the quantification of bacterial cells attached to surfaces. As the bacteria proliferate on the surface over a period of time, the relative fluorescence unit (RFU) measured using the plate reader also shows an increase with time. This was observed on all three test surfaces (glass, Epikote and Silastic T2) over a period of 4 h of bacterial growth, followed by a release assay, which was carried out by the application of hydrodynamic shear forces using a custom-made rotary device. Different fixed rotor speeds were tested, and based on the release analysis, 12 knots was used to provide standard shear force. The assay developed was then applied for assessing three different antifouling coatings of different surface roughness. The novel assay allows the rapid and sensitive enumeration of attached bacteria directly on the coated surface. This is the first plate reader assay technique that allows estimation of irreversibly attached bacterial cells directly on the coated surface without their removal from the surface or extraction of a stain into solution.

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“…Additionally, one of its major components is fluorine (39.63%). The effect of fluorine on the inhibition of initial bacterial attachment was recently investigated [14]. The attachment of both hydrophilic and hydrophobic bacterial strains was dramatically reduced when introducing fluorine into a polydimethylsiloxane coating [14].…”

Section: Surface Elemental Compositionmentioning

confidence: 99%

Biofilm formation on oral piercings

Kapferer

Steiner

Beier

et al. 2010

J. Stomat. Occ. Med.

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Purpose: Biofilms on oral piercings might serve as a bacterial reservoir in the host and lead to bacteraemia and even septic complications. The use of piercing materials less susceptible to biofilm accumulation could contribute to alleviation of problems. The present study aimed to assess biofilm formation on four commercially available, surface characterized piercing materials in vitro (polytetrafluoroethylene, titanium, stainless steel, and polypropylene).Material and methods: Autoclave-sterilized piercings were surface characterized by X-ray photoelectron spectroscopy, contact angle measurements, and atomic force microscopy. Biofilms were grown for 1, 4, or 20 h on the piercing surfaces by immersion in pooled human whole saliva. Colony forming units (CFUs) were determined. For fluorescence microscopy, samples were stained with DAPI.Results: All four piercing materials included showed significant amounts of biofilm after 20 h of incubation. Biofilm formation was significantly lowest on polytetrafluoroethylene piercings (p < 0.001), and was mainly determined by wettability -which was significantly lowest for polytetrafluoroethylene (p < 0.001) -and the prevalence of carbon-and oxygen-rich components. Surface roughness measurements showed no statistically significant differences, but standard deviations were rather high. High standard deviations are caused by substantial pits and elevations and are due to poor machining quality in the manufacture of the piercings.Conclusion: Biofilm formation on oral piercings was mainly determined by surface free energy and the prevalence of carbon-and oxygen-rich components, and was significantly lowest on polytetrafluoroethylene piercings. The findings indicate that oral piercings might serve as a reservoir of potentially pathogenic bacterial species.

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Fluorination of poly(dimethylsiloxane) surfaces by low pressure CF4 plasma – physicochemical and antifouling properties

Cited by 56 publications

References 44 publications

Development and tuning of Matrimid membrane oxygenators with improved biocompatibility and gas permeance by plasma treatment

Development and tuning of Matrimid membrane oxygenators with improved biocompatibility and gas permeance by plasma treatment

Bacterial assay for the rapid assessment of antifouling and fouling release properties of coatings and materials

Biofilm formation on oral piercings

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