The Effect of Excited Species on the Collisional Energy of Argon Inductively Coupled Plasmas: A Global Model Study

Karnopp, Júlia; Magaldi, Bernardo Vieira; Sagás, Júlio César; Pessoa, Rodrigo Sávio

doi:10.3390/plasma5010003

Cited by 5 publications

(3 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…coli, the organic material is oxidized because of its photocatalytic activity, and as a result, the organic material of the cell wall membrane increases the number of holes in the TiO 2 valence band . The bactericidal activity and aggregation of TiO 2 are positively linked to the rate of cell death. , …”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Enhancing the Production of Eco-Friendly Silk Fabrics through the Application of Nonthermal Plasma Wettability Techniques

Rida Galaly,

Dawood

2024

ACS Omega

View full text Add to dashboard Cite

The combination of the effects of nonthermal plasma using atmospheric pressure of plasma jet and the photocatalytic effects of titanium dioxide nanoparticles was used to study the plasma flow modes, electrical characteristics, nonthermal characteristics, antimicrobial measurements, and surface modifications. Using different wettabilities of argon discharges in a laminar flow: (i) wet I, wettability with 2.4 slm argon mixture with oxygen ratio O 2 , equivalent to 15 mslm (Ar/O 2 ), and (ii) wet II, wettability (Ar/O 2 ) mixture combined with titanium dioxide, to accelerate the inactivation process on the nonwoven fabric surface. For wet 0, wet I, and wet II discharges, the average rate of heat transfer to the nonwoven silk fabric increased significantly. Specifically, it goes from 104.6 to 118.6 and then to 241.7 mW, respectively. The kinetic deactivation rate of Escherichia coli increases starting at 0.20, then going up to 0.32, and finally reaching 0.57 min −1 . The increased wettability of the TiO 2 photocatalyst results in an enhanced bactericidal rate, which is caused by both the heat impact from the nonthermal jet and potentially photocatalytic disinfection, leading to the generation of active species. The mechanical parameters owing to different wettabilities and plasma interactions with the fabric membrane were tested for the treated samples, such as stiffness, ultimate yield strength, tensile strength, strain, hardening, elongation, resilience, and toughness.

show abstract

Section: Resultsmentioning

confidence: 99%

“… 100 The bactericidal activity and aggregation of TiO 2 are positively linked to the rate of cell death. 101 , 102 …”

Section: Resultsmentioning

confidence: 99%

Enhancing the Production of Eco-Friendly Silk Fabrics through the Application of Nonthermal Plasma Wettability Techniques

Rida Galaly,

Dawood

2024

ACS Omega

View full text Add to dashboard Cite

show abstract

“…Altering plasma discharge properties via noble gas addition is a well-known concept in surface etching and plasma processing applications. − Argon plasma is populated with a high concentration of active species, such as metastable Ar, which has a high capability for storing excess energy. Due to their long lifetimes, these metastable states may activate other gaseous species via Penning excitation and ionization processes. − Noble gas addition can also stabilize the plasma discharge and offer better control over plasma properties. , These concepts have been applied to different types of discharges for plasma-assisted ammonia synthesis. Nakajima and Sekiguchi reported increased NH 3 formation rate upon argon addition in a microwave discharge .…”

Section: Introductionmentioning

confidence: 99%

Kinetic Modeling Analysis of Ar Addition to Atmospheric Pressure N₂–H₂ Plasma for Plasma-Assisted Catalytic Synthesis of NH₃

Lin,

Abe,

Chen

et al. 2024

J. Phys. Chem. A

View full text Add to dashboard Cite

Zero-dimensional kinetic modeling of atmospheric pressure Ar− N 2 −H 2 nonthermal plasma was carried out to gain mechanistic insights into plasma-assisted catalytic synthesis of ammonia. Ar dilution is a common technique for tailoring plasma discharge properties and has been shown to enhance NH 3 formation when added to N 2 −H 2 plasma. The kinetic model was developed for a coaxial dielectric barrier discharge quartz wool-packed bed reactor operating at near room temperature using a kHz-frequency plasma source. With 30% Ar mixed in a 1:1 N 2 −H 2 plasma at 760 Torr, we find that NH 3 production is dominated by Eley−Rideal (E-R) surface reactions, which heavily involve surface NH x species derived from N and H radicals in the gas phase, while the influence of excited N 2 molecules is negligible. This is contrary to the commonly proposed mechanism that excited N 2 molecules created by Penning excitation of N 2 by Ar(4s) and Ar(4p) play a significant role in assisting NH 3 formation. Our model shows that the enhanced NH 3 formation upon Ar dilution is unlikely due to the interactions between Ar and H species, as excited Ar atoms have a weak effect on H radical formation through H 2 dissociation compared to electrons. We find that excited Ar atoms contribute to 28% of the N radical production in the gas phase via N 2 dissociation, while the rest are dominated by electronimpact dissociation. Furthermore, Ar species play a negligible role in the product NH 3 dissociation. N 2 conversion sensitivity analyses were carried out for electron number density (n e ) and reduced electric field (E/N), and contributions from Ar to gas-phase N radical production were quantified. The model can provide guidance on potential reasons for observing enhanced NH 3 formation upon Ar dilution in N 2 −H 2 plasma beyond changes in the discharge characteristics.Article pubs.acs.org/JPCA

show abstract

Theoretical study of particle and energy balance equations in locally bounded plasmas

JUN,

TSANG,

YOO

et al. 2024

Plasma Sci. Technol.

View full text Add to dashboard Cite

In this study, new particle and energy balance equations have been developed to predict the electron temperature and density in locally bounded plasmas. Classical particle and energy balance equations assume that all plasma within a reactor is completely confined only by the reactor walls. However, in industrial plasma reactors for semiconductor manufacturing, the plasma is partially confined by internal reactor structures. We predict the effect of the open boundary area (A_L,eff') and ion escape velocity (u_i) on electron temperature and density by developing new particle and energy balance equations. Theoretically, we found a low ion escape velocity (u_i/u_B≈0.2) and high open boundary area (A_L,eff'/A_T,eff)≈0.6) to result in an approximately 38% increase in electron density and a 8% decrease in electron temperature compared to values in a fully bounded reactor. Additionally, we suggest that the velocity of ions passing through the open boundary should exceed ω_pi *λ_De under the condition (E_0)^2≪(Φ/λ_De)^2.

show abstract

The Effect of Excited Species on the Collisional Energy of Argon Inductively Coupled Plasmas: A Global Model Study

Cited by 5 publications

References 46 publications

Enhancing the Production of Eco-Friendly Silk Fabrics through the Application of Nonthermal Plasma Wettability Techniques

Enhancing the Production of Eco-Friendly Silk Fabrics through the Application of Nonthermal Plasma Wettability Techniques

Kinetic Modeling Analysis of Ar Addition to Atmospheric Pressure N₂–H₂ Plasma for Plasma-Assisted Catalytic Synthesis of NH₃

Theoretical study of particle and energy balance equations in locally bounded plasmas

Contact Info

Product

Resources

About

The Effect of Excited Species on the Collisional Energy of Argon Inductively Coupled Plasmas: A Global Model Study

Cited by 5 publications

References 46 publications

Enhancing the Production of Eco-Friendly Silk Fabrics through the Application of Nonthermal Plasma Wettability Techniques

Enhancing the Production of Eco-Friendly Silk Fabrics through the Application of Nonthermal Plasma Wettability Techniques

Kinetic Modeling Analysis of Ar Addition to Atmospheric Pressure N2–H2 Plasma for Plasma-Assisted Catalytic Synthesis of NH3

Theoretical study of particle and energy balance equations in locally bounded plasmas

Contact Info

Product

Resources

About

Kinetic Modeling Analysis of Ar Addition to Atmospheric Pressure N₂–H₂ Plasma for Plasma-Assisted Catalytic Synthesis of NH₃