The acidification of lipid film surfaces by non-thermal DBD at atmospheric pressure in air

Helmke, Andreas; Hoffmeister, Dennis; Mertens, Nina; Emmert, Steffen; Schuette, J; Vioel, Wolfgang

doi:10.1088/1367-2630/11/11/115025

Cited by 111 publications

(88 citation statements)

References 3 publications

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“…It was previously suggested that the acidity of plasma treated water might be the result of nitric and nitrous acid formation. [9][10][11]28,31] However, as it is shown in Figure 3, pH drops in plasma treated liquid not only in air but also in oxygen environment: nitric acid formation cannot explain the acidity of plasma treated water in oxygen. In order to explain the differences between the results obtained by ref.…”

Section: Discussionmentioning

confidence: 96%

Retraction: Plasma Acid: Water Treated by Dielectric Barrier Discharge

Shainsky

Dobrynin

Ercan

et al. 2012

Plasma Processes & Polymers

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It is demonstrated that direct exposure of deionized water to a dielectric barrier discharge (DBD) plasma creates an acid (pH % 2) and is in fact, a strong oxidizer (providing, e.g., peroxidation of a cell membrane). This study addresses the question: which acid is created in water by plasma treatment. Two major possibilities are considered: nitric/nitrous acid and an acid which consist of a hydrogen cation (H þ ) and a superoxide anion (O À 2 ), which, for the lack of a better term, we call plasma acid. The presence of nitric/nitrous acid in the water after plasma treatment in air is confirmed, although the observed pH % 2 cannot be completely explained by the production of nitric acid. Moreover, experiments with oxygen-plasma treatment of water also lead to high acidity, without production of nitrogen based acids at all. Therefore, O À 2 , the conjugate base of the plasma acid, is at least partially responsible for both lowering of the pH and the increase in the oxidizing power of the solution. Experiments indicate that peroxides such as H 2 O 2 and O À 2 , together with an acidic environment are likely to be responsible for the oxidation properties of the plasma treated water. This plasma acid remains stable for at least a day, depending on the gas where plasma is generated, but the effect is temporal. Existence of a temporal and stable oxidizer created using the plasma treatment of pure water not only raises interesting scientific questions and possibilities, but is also likely to provide many applications in situations where direct plasma treatment may be difficult to achieve. Plasma Process. Polym. 2012,

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Section: Discussionmentioning

confidence: 96%

Retraction: Plasma Acid: Water Treated by Dielectric Barrier Discharge

Shainsky

Dobrynin

Ercan

et al. 2012

Plasma Processes & Polymers

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“…The plasma power, P plasma , of the used plasma source was determined using the Lissajous algorithm [11,12] according to…”

Section: Experimental Setup and Experimentationmentioning

confidence: 99%

Atmospheric pressure argon plasma-assisted enhancement of laser ablation of aluminum

et al. 2012

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In this paper, we present a hybrid laser-plasma ablation method for material processing applications. For this purpose, a coaxial configuration consisting of a low-temperature atmospheric pressure argon plasma beam and a Nd:YAG-laser at a wavelength of 355 nm was used. Both pure laser ablation and hybrid laser-plasma ablation experiments were performed on aluminum at different laser energies and numbers of laser pulses. In the case of hybrid ablation, both the depth and volume ablation rates were increased significantly in comparison to pure laser ablation. This effect is described by a linear interrelationship of both the ablation rate and the particularly applied laser energy and is thus due to energetic synergies. Such behavior can be explained by the de-excitation of argon plasma species and an accompanying energy deposition at the generated debris and the sample surface. The energetic effect was found to abate with increasing ablation depth. However, considerable improvements in terms of ablation rate are achieved in the near-surface depth range of approx. 500 microns

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“…Nitrates formed in water droplets could form nitric acid. NOx species could adhere on lipid surface or deposited nitric acid on the film surfaces by gaseous HNO 3 [91]. The recovery of pH in the post-plasma phase was attributed to the decrease of acidifying agents on the substrate surfaces by both diffusion and desorption processes.…”

Section: Acidifying Effect Of Plasma On Skinmentioning

confidence: 99%

Enhancement of Percutaneous Absorption on Skin by Plasma Drug Delivery Method

Shimizu¹,

Krištof²

2017

Advanced Technology for Delivering Therapeutics

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Transdermal drug delivery (TDD) is a painless method of low-dose drug delivery. The advantages and disadvantages of transdermal drug delivery methods are named and basic methods such as using chemical enhancers, iontophoresis and electrophoresis are introduced. One of the promising methods make use of plasma which is generated in atmospheric pressure mostly in volume or on surface dielectric barrier discharge (DBD) or in plasma jet. As the plasma produces various particles according to the used gas, UV radiation and heat, their effects on skin and barrier function are described. Improvement of transdermal drug delivery of hydrophilic drug galantamine hydrobromide (GaHBr) using microplasma electrode is introduced.

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The acidification of lipid film surfaces by non-thermal DBD at atmospheric pressure in air

Cited by 111 publications

References 3 publications

Retraction: Plasma Acid: Water Treated by Dielectric Barrier Discharge

Retraction: Plasma Acid: Water Treated by Dielectric Barrier Discharge

Atmospheric pressure argon plasma-assisted enhancement of laser ablation of aluminum

Enhancement of Percutaneous Absorption on Skin by Plasma Drug Delivery Method

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