Long-distance oxygen plasma sterilization: Effects and mechanisms

Liu, Hongxia; Chen, Jierong; Yang, Lifan; Zhou, Yuan

doi:10.1016/j.apsusc.2007.07.152

Cited by 67 publications

(42 citation statements)

References 24 publications

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“…Axenic samples were affirmed by optical microscope before use. The reactor is the same as used in the previous work [15].…”

Section: Methodsmentioning

confidence: 99%

“…The samples used in this study were PTFE films which were the carrier of E. coli in the previous research [15]. Prior to the experiment, the sterilized PTFE films were ultrasonically cleaned in acetone, ethanol and deionized water in sequence, and then dried under sterile condition.…”

Section: Methodsmentioning

confidence: 99%

“…Obtaining favorable surface properties of PTFE by long-distance oxygen plasma sterilization is prospective. This paper is a follow up to our previous study [15] and the aim is to evaluate the physicochemical and medical properties of longThe influence of long-distance oxygen plasma sterilization on surface properties of substrate material, i.e., medical poly(tetrafluoroethylene) (PTFE), and aging effect of these sterilized PTFE film surfaces were investigated by contact angle measurement, mass loss determination, scanning electron microscopy (SEM) as well as bacterial adhesion and platelet adhesion measurements in vitro, respectively. The changes in chemical structure of sterilized PTFE film were followed using X-ray photoelectron spectroscopy (XPS).…”

Section: Introductionmentioning

confidence: 90%

“…In our previous work [15], effective inactivation of Escherichia coli on the surface of medical poly(tetrafluoroethylene) (PTFE) film can be obtained successfully within the distance of 0-40 cm from the active discharge zone in a long-distance oxygen plasma under the following conditions: plasma rf power 100 W, treatment time 60 s and oxygen flux 40 cm 3 /min. Based on the distribution of electrons, ions and oxygen radicals in long-distance oxygen plasma [15], reactions of oxygen radicals with the PTFE surfaces will occur predominantly, but electron and ion bombardment will occur scarcely during the oxygen plasma afterglow sterilization [16].…”

Section: Introductionmentioning

confidence: 99%

“…Based on the distribution of electrons, ions and oxygen radicals in long-distance oxygen plasma [15], reactions of oxygen radicals with the PTFE surfaces will occur predominantly, but electron and ion bombardment will occur scarcely during the oxygen plasma afterglow sterilization [16]. Obtaining favorable surface properties of PTFE by long-distance oxygen plasma sterilization is prospective.…”

Section: Introductionmentioning

confidence: 99%

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Surface analysis of long-distance oxygen plasma sterilized PTFE film

Liu

Zhang

Chen

2009

Applied Surface Science

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“…Axenic samples were affirmed by optical microscope before use. The reactor is the same as used in the previous work [15].…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Surface analysis of long-distance oxygen plasma sterilized PTFE film

Liu

Zhang

Chen

2009

Applied Surface Science

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Solid–Liquid Hybrid‐State Organic Lens for Highly Efficient Deep Ultraviolet Light‐Emitting Diodes

Deng

et al. 2022

Advanced Photonics Research

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Deep ultraviolet light‐emitting diodes (DUV‐LEDs) are considered to be the most promising ultraviolet light sources for effective and fast sterilization under the worldwide spread of the coronavirus disease (COVID‐19). However, it reminds challenging to promote the light extraction of DUV‐LEDs owing to the strong DUV light absorption of conventional encapsulation materials. Herein, solid–liquid hybrid‐state gels (SLHGs) to fabricate organic lenses for DUV‐LEDs, which largely enhance the light extraction efficiency without sacrificing the working stability, are proposed. Solid‐state cross‐linked networks of polydimethylsiloxane are used in the SLHG structure to maintain the liquid components of silicone oil and demonstrate excellent formability, DUV transparency (over 90% transmittance in the UVC range), and thermal stability. The radiant power of DUV‐LEDs (275 nm) with the optimized SLHG organic lens is enhanced by 52.5% compared to a commercial quartz lens, achieving a record packaging optical effiency of 1.31 among solid‐state packaging DUV‐LEDs. A sterilization evaluation for SARS‐CoV‐2 demonstrates that the inactivation time can be reduced by ≈25% using the SLHG organic lens. Consequently, herein, a feasible and effective method to enhance the optical performance of DUV‐LEDs and advance their promising potential for disinfection applications is provided.

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Remote delivery of hydroxyl radicals via secondary chemistry of a nonthermal plasma effluent

Plimpton

Gołkowski

Mitchell

et al. 2013

Biotech & Bioengineering

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Electron paramagnetic resonance spectroscopy is used to observe hydroxyl radicals produced by an atmospheric pressure nonthermal plasma device at distances greater than 1 m from the discharge. The plasma device is an indirect treatment setup with closed loop airflow and hydrogen peroxide additives that is effective in deactivating bacteria on time scales of seconds. The generation of the detected hydroxyl radicals is shown to occur in secondary chemical processes near the point of delivery of the plasma treated air stream. The production of hydroxyl radicals is correlated with humidity of the air stream and ability to lyse bacterial membranes. The overall mechanisms of bacteria inactivation are found to be a combinatorial effect of effluent species. The results indicate the feasibility of selective plasma induced free radical delivery for biomedical applications even in the case of short-lived species like the hydroxyl radical.

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Long-distance oxygen plasma sterilization: Effects and mechanisms

Cited by 67 publications

References 24 publications

Surface analysis of long-distance oxygen plasma sterilized PTFE film

Surface analysis of long-distance oxygen plasma sterilized PTFE film

Solid–Liquid Hybrid‐State Organic Lens for Highly Efficient Deep Ultraviolet Light‐Emitting Diodes

Remote delivery of hydroxyl radicals via secondary chemistry of a nonthermal plasma effluent

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