Effect of a new low pressure SF6 plasma sterilization system on polymeric devices

Mrad, O.; Saloum, S.; Al-Mariri, Ayman

doi:10.1016/j.vacuum.2012.08.002

Cited by 17 publications

(11 citation statements)

References 27 publications

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“…Possible damage to the tube material (surface and bulk) by the exposure to the plasma treatment is also an important issue. This discharge source was previously used for a study aimed to compare the effect of plasma and electron beam treatments on the walls of PU catheters . In that study, it was shown that, contrary to e‐beam irradiation, plasma treatment did not damage the bulk of the polyurethane catheter nor affect the additives.…”

Section: Discussionmentioning

confidence: 99%

Bacterial Decontamination of the Inner Wall of Narrow Tubes by a Nitrogen Afterglow at Atmospheric Pressure and its Relation to Local Atomic Nitrogen Concentration

Limam

Odic

Kirkpatrick

et al. 2013

Plasma Processes & Polymers

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International audienceA quartz tube with inner wall contaminated by Escherichia coli bacteria is treated using an atmospheric pressure nitrogen afterglow flowing at 20 SLM. The biocidal efficacy is measured locally at both the input and at the output of a 57 cm tube, giving a reduction of survivors of around 5 and 4 log for a 40 min treatment time, respectively. A weak contribution of gas heating is observed and delineated from the effect uniquely due to the plasma afterglow. Based on previous work, a model allows the estimation of the variation of the axial concentration of N atoms, assumed to be the main active species, and its correlation to the biocidal effect of the afterglow. Extrapolation of the model opens the perspective of the decontamination of longer tubes with smaller diameters such as catheter and endoscope ducts

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Section: Discussionmentioning

confidence: 99%

Bacterial Decontamination of the Inner Wall of Narrow Tubes by a Nitrogen Afterglow at Atmospheric Pressure and its Relation to Local Atomic Nitrogen Concentration

Limam

Odic

Kirkpatrick

et al. 2013

Plasma Processes & Polymers

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“…Van Hest et al and Rich et al reported that atomic oxygen reacts easily with SiCH 3 , SiH, Si, and CH 3 groups of the pp‐HMDSO film. SF 6 plasma, providing the reactive etchant fluorine atoms, was previously and successfully used for the enhancement of polymers hydrophobicity, while for pp‐HMDSO thin film surface modification, an elevated etching rate (≈90 nm/min) of this material in SF 6 plasma was reported, making it a potential candidate in the area of designing high–aspect ratio microelectromechanical systems…”

Section: Introductionmentioning

confidence: 99%

Effect of surface modification on the properties of plasma‐polymerized hexamethyldisiloxane thin films

Saloum

Shaker

Alkafri

et al. 2019

Surface & Interface Analysis

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Plasma‐polymerized hexamethyldisiloxane (pp‐HMDSO) thin films have been deposited in a radiofrequency (RF) remote plasma‐enhanced chemical vapor deposition (PECVD) system, on different types of substrates: silicon wafers, glass, quartz crystals, and chemiresistor structure. The as‐grown thin films have been post treated in two types of reactive plasmas produced in SF6 and O2 gases. The effect of this surface modification on different properties of the as‐grown pp‐HMDSO thin film (chemical structure, elemental composition, surface morphology, film density and thickness, optical bandgap, and electrical resistivity) has been investigated. It is found that SF6 plasma and O2 plasma surface modifications of the as‐grown pp‐HMDSO thin film induce property changes different from each other. SF6 plasma converted the as‐grown pp‐HMDSO film to a more porous material and caused a narrowing of its optical band gap of about 33%, while O2 plasma induced a lowering of film electrical resistivity of about two orders of magnitude.

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“…Fluorine-containing plasmas are often used for the surface hydrophobization of polymer materials [1,2,3,4,5,6,7,8] and for dry-etching in the semiconducting industry [9,10,11,12]. In the latter, the addition of oxygen is used to enhance the etching rate [11].…”

Section: Introductionmentioning

confidence: 99%

“…SF 6 is rarely used, and therefore, literature is scarce. SF 6 plasma has been used to treat polyethylene terephthalate PET (fabric [1], fibres [7] or film [5]), cotton fibres [7], polypropylene (PP) [3,4], polyethylene (PE) [5], polyvinyl chloride (PVC) [5] and polymethyl methacrylate [2]. The authors reported increased hydrophobicity; however, different authors reported different stabilities of the hydrophobic surface.…”

Section: Introductionmentioning

confidence: 99%

“…Walton et al found a negligible ageing effect after one year for the sample treated for the longest treatment time of 60 s, but this was not the case for the samples treated for shorter times [6]. Mrad et al observed the ageing of PET, whereas PVC was stable even 210 days after treatment [5]. Polyethylene was quite stable as well, because the contact angle did not change in the first 40 days of ageing, whereas later it slightly decreased.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of SF6 and CF4 Plasma Treatment for Surface Hydrophobization of PET Polymer

et al. 2018

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The fluorination of the polymer polyethylene terephthalate in plasma created from SF6 or CF4 gas at various pressures was investigated. The surface was analysed by X-ray photoelectron spectroscopy and water contact angle measurements, whereas the plasma was characterized by optical emission spectroscopy. The extent of the polymer surface fluorination was dependent on the pressure. Up to a threshold pressure, the amount of fluorine on the polymer surface and the surface hydrophobicity were similar, which was explained by the full dissociation of the SF6 and CF4 gases, leading to high concentrations of fluorine radicals in the plasma and thus causing the saturation of the polymer surface with fluorine functional groups. Above the threshold pressure, the amount of fluorine on the polymer surface significantly decreased, whereas the oxygen concentration increased, leading to the formation of the hydrophilic surface. This effect, which was more pronounced for the SF6 plasma, was explained by the electronegativity of both gases.

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Effect of a new low pressure SF6 plasma sterilization system on polymeric devices

Cited by 17 publications

References 27 publications

Bacterial Decontamination of the Inner Wall of Narrow Tubes by a Nitrogen Afterglow at Atmospheric Pressure and its Relation to Local Atomic Nitrogen Concentration

Bacterial Decontamination of the Inner Wall of Narrow Tubes by a Nitrogen Afterglow at Atmospheric Pressure and its Relation to Local Atomic Nitrogen Concentration

Effect of surface modification on the properties of plasma‐polymerized hexamethyldisiloxane thin films

Comparison of SF6 and CF4 Plasma Treatment for Surface Hydrophobization of PET Polymer

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