scholarly journals Infrared Absorption Spectroscopic Study on Reaction between Self-Assembled Monolayers and Atmospheric-Pressure Plasma

2015 ◽  
Vol 2015 ◽  
pp. 1-7
Author(s):  
Masanori Shinohara ◽  
Katsuhiro Amano ◽  
Naoki Maruno ◽  
Yuta Yoshida ◽  
Yoshinobu Matsuda ◽  
...  
Keyword(s):  
Protein Interactions ◽  
Atmospheric Pressure ◽  
Water Clusters ◽  
Atmospheric Pressure Plasma ◽  
Air Plasma ◽  
Self Assembled Monolayer ◽  
Pressure Plasma ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Living Tissues

Plasma is becoming increasingly adopted in bioapplications such as plasma medicine and agriculture. This study investigates the interaction between plasma and molecules in living tissues, focusing on plasma-protein interactions. To this end, the reaction of air-pressure air plasma with NH2-terminated self-assembled monolayer is investigated by infrared spectroscopy in multiple internal reflection geometry. The atmospheric-pressure plasma decomposed the NH2components, the characteristic units of proteins. The decomposition is attributed to water clusters generated in the plasma, indicating that protein decomposition by plasma requires humid air.

An experimental study of photoresist material etching by an atmospheric-pressure plasma jet with Ar/air mixed gas

2013 ◽  
Vol 79 (5) ◽  
pp. 683-689 ◽  
Author(s):  
LIJUN WANG ◽  
WENJUN NING ◽  
MINGZHENG FU ◽  
CHEN WU ◽  
SHENLI JIA
Keyword(s):  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jet ◽  
Atmospheric Pressure Plasma Jet ◽  
Air Plasma ◽  
Pressure Plasma ◽  
Plasma Needle ◽  
Ar Plasma ◽  
Etched Surface ◽  
Plasma Pencil

AbstractIn this paper, electrical and optical emission spectrometer (OES) characteristics of an Ar/air atmospheric-pressure plasma jet (APPJ) based on the plasma needle and plasma pencil systems were investigated and analyzed. Electrical measurement results showed that the breakdown and working voltage of the jet increased with the increase of the ratio of air/Ar, and the emission intensity of Ar* significantly decreased. For the plasma needle, when the ratio of air/Ar reached 1, the OES characteristics of Ar/air were similar to those of air plasma, and the main excited species was N2*. For the plasma pencil, when a little air impurity was added in Ar, the emission intensities of N2* species will be significantly increased. Based on these two APPJ systems, photoresist materials were etched, etched results showed that the etched surface was easier to be oxidized with the addition of air into Ar. The etched surface was cleaner with pure Ar plasma with scanning substrate methods than that with the Ar/air mixture. Etched results of higher ratios of air/Ar plasma were similar to those of air plasma.

Cold-Air Atmospheric Pressure Plasma Against Clostridium difficile Spores: A Potential Alternative for the Decontamination of Hospital Inanimate Surfaces

2015 ◽  
Vol 36 (6) ◽  
pp. 742-744 ◽  
Author(s):  
Tânia Claro ◽  
Orla J. Cahill ◽  
Niall O’Connor ◽  
Stephen Daniels ◽  
Hilary Humphreys
Keyword(s):  
Clostridium Difficile ◽  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Infect Control Hosp ◽  
Air Plasma ◽  
Cold Air ◽  
Pressure Plasma ◽  
Environmental Surfaces ◽  
Potential Alternative ◽  
Single Jet

AbstractClostridium difficile spores survive for months on environmental surfaces and are highly resistant to decontamination. We evaluated the effect of cold-air plasma against C. difficile spores. The single-jet had no effect while the multi-jet achieved 2–3 log10 reductions in spore counts and may augment traditional decontamination.Infect Control Hosp Epidemiol 2015;00(0):1–3

scholarly journals On the Icephobic Behavior of Organosilicon-Based Surface Structures Developed Through Atmospheric Pressure Plasma Deposition in Nitrogen Plasma

Coatings ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 679 ◽  
Author(s):  
Siavash Asadollahi ◽  
Masoud Farzaneh ◽  
Luc Stafford
Keyword(s):  
Atmospheric Pressure ◽  
Plasma Deposition ◽  
Protective Coatings ◽  
Atmospheric Pressure Plasma ◽  
Nitrogen Plasma ◽  
Air Plasma ◽  
Pressure Plasma ◽  
Ice Storms ◽  
Ice Accumulation ◽  
Ice Adhesion

In many regions around the world, atmospheric icing during freezing rains and ice storms can cause severe damage to exposed infrastructure. Subsequently, protective coatings capable of ice accumulation prevention or ice adhesion reduction, often referred to as icephobic coatings, have gained a significant amount of interest. In this study, we examine an atmospheric-pressure plasma jet technique for the development of organosilicon-based icephobic coatings on aluminum substrates. Initially, Al-6061 samples are exposed to multiple passes of air plasma treatment at very short jet-to-substrate distances to create a microporous alumina-based surface structure. These surfaces are then used for plasma deposition of superhydrophobic coatings in the same jet with hexamethyldisiloxane (HMDSO) as the precursor and nitrogen as the plasma gas. Several samples are created with varying plasma precursor flow rates and number of deposition passes. All samples are exposed to three cycles of icing/de-icing to estimate coatings’ stability in aggressive natural conditions. The effects of multiple icing/de-icing cycles on surface chemistry, surface morphology, and wetting behavior is studied. It is shown that the most remarkable mechanism through which icing affects surface properties is coating removal during aggressive de-icing procedure. Finally, the icephobic properties of the most efficient coating (referred to as PT5x3) is further studied through 10 cycles of icing/de-icing, and it is shown that this coating can reduce ice adhesion strength by a factor of at least two for up to nine cycles of icing/de-icing.

scholarly journals Anticancer Efficacy of Long-Term Stored Plasma-Activated Medium

2019 ◽  
Vol 9 (4) ◽  
pp. 801 ◽  
Author(s):  
Ngoc Nguyen ◽  
Hyung Park ◽  
Soon Hwang ◽  
Jong-Soo Lee ◽  
Sang Yang
Keyword(s):  
Atmospheric Pressure ◽  
Therapeutic Potential ◽  
Atmospheric Pressure Plasma ◽  
Reactive Species ◽  
The Body ◽  
Air Plasma ◽  
Anticancer Efficacy ◽  
Pressure Plasma ◽  
Anticancer Effects ◽  
Fresh Plasma

The therapeutic potential of nonthermal atmospheric-pressure plasma for cancer treatment via generation of reactive species, induction of decreased mitochondrial membrane potential, and sequential apoptosis has been reported in our previous studies. Nonthermal atmospheric-pressure plasma-activated medium produced by jetting air plasma above a liquid surface shows advantages over direct plasma such as storage and delivery to tissues inside the body. In this study, we demonstrated that plasma-activated medium can be stored for up to 6 months in a freezer and that the stored plasma-activated medium has anticancer effects similar to those of direct plasma. Plasma-activated medium stored for 6 months showed cytocidal effects on human cervical cancer HeLa cells that were comparable to the effects of fresh plasma-activated medium or direct plasma. Furthermore, the levels of reactive species in plasma-activated medium persisted for up to 6 months. These results indicate that therapeutic application of plasma-activated medium is applicable in plasma medicine and is a promising anticancer strategy.

scholarly journals Differential Influence of Components Resulting from Atmospheric-Pressure Plasma on Integrin Expression of Human HaCaT Keratinocytes

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Beate Haertel ◽  
Susanne Straßenburg ◽  
Katrin Oehmigen ◽  
Kristian Wende ◽  
Thomas von Woedtke ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Wound Healing ◽  
Atmospheric Pressure ◽  
Treatment Time ◽  
Atmospheric Pressure Plasma ◽  
Integrin Expression ◽  
Hacat Keratinocytes ◽  
Air Plasma ◽  
Pressure Plasma ◽  
Intracellular Ros

Adequate chronic wound healing is a major problem in medicine. A new solution might be non-thermal atmospheric-pressure plasma effectively inactivating microorganisms and influencing cells in wound healing. Plasma components as, for example, radicals can affect cells differently. HaCaT keratinocytes were treated with Dielectric Barrier Discharge plasma (DBD/air, DBD/argon), ozone or hydrogen peroxide to find the components responsible for changes in integrin expression, intracellular ROS formation or apoptosis induction. Dependent on plasma treatment time reduction of recovered cells was observed with no increase of apoptotic cells, but breakdown of mitochondrial membrane potential. DBD/air plasma increased integrins and intracellular ROS. DBD/argon caused minor changes. About 100 ppm ozone did not influence integrins. Hydrogen peroxide caused similar effects compared to DBD/air plasma. In conclusion, effects depended on working gas and exposure time to plasma. Short treatment cycles did neither change integrins nor induce apoptosis or ROS. Longer treatments changed integrins as important for influencing wound healing. Plasma effects on integrins are rather attributed to induction of other ROS than to generation of ozone. Changes of integrins by plasma may provide new solutions of improving wound healing, however, conditions are needed which allow initiating the relevant influence on integrins without being cytotoxic to cells.

Ultrasonic Wave Detection in Atmospheric Pressure Plasma Using Fraunhofer Diffraction Effect

PIERS Online ◽  
2010 ◽  
Vol 6 (7) ◽  
pp. 636-639
Author(s):  
Toshiyuki Nakamiya ◽  
Fumiaki Mitsugi ◽  
Shota Suyama ◽  
Tomoaki Ikegami ◽  
Yoshito Sonoda ◽  
...  
Keyword(s):  
Ultrasonic Wave ◽  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Diffraction Effect ◽  
Fraunhofer Diffraction ◽  
Wave Detection ◽  
Pressure Plasma

scholarly journals Atmospheric Pressure Plasma Deposition of TiO2: A Review

Materials ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 2931
Author(s):  
Soumya Banerjee ◽  
Ek Adhikari ◽  
Pitambar Sapkota ◽  
Amal Sebastian ◽  
Sylwia Ptasinska
Keyword(s):  
Atmospheric Pressure ◽  
Gas Flow ◽  
Plasma Deposition ◽  
Atmospheric Pressure Plasma ◽  
Cost Savings ◽  
Historical Background ◽  
Pressure Plasma ◽  
Wide Range ◽  
The Status ◽  
Deposition Techniques

Atmospheric pressure plasma (APP) deposition techniques are useful today because of their simplicity and their time and cost savings, particularly for growth of oxide films. Among the oxide materials, titanium dioxide (TiO2) has a wide range of applications in electronics, solar cells, and photocatalysis, which has made it an extremely popular research topic for decades. Here, we provide an overview of non-thermal APP deposition techniques for TiO2 thin film, some historical background, and some very recent findings and developments. First, we define non-thermal plasma, and then we describe the advantages of APP deposition. In addition, we explain the importance of TiO2 and then describe briefly the three deposition techniques used to date. We also compare the structural, electronic, and optical properties of TiO2 films deposited by different APP methods. Lastly, we examine the status of current research related to the effects of such deposition parameters as plasma power, feed gas, bias voltage, gas flow rate, and substrate temperature on the deposition rate, crystal phase, and other film properties. The examples given cover the most common APP deposition techniques for TiO2 growth to understand their advantages for specific applications. In addition, we discuss the important challenges that APP deposition is facing in this rapidly growing field.

Effects of iodine dopant on atmospheric pressure plasma polymerized pyrrole in remote and coupling methods

2018 ◽  
Vol 677 (1) ◽  
pp. 135-142
Author(s):  
Dong Ha Kim ◽  
Choon-Sang Park ◽  
Eun Young Jung ◽  
Bhum Jae Shin ◽  
Jae Young Kim ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Pressure Plasma ◽  
Coupling Methods
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