Effects of oxygen addition to argon glow discharges: A hybrid Monte Carlo-fluid modeling investigation

Bogaerts, Annemie

doi:10.1016/j.sab.2009.10.003

Cited by 61 publications

(43 citation statements)

References 71 publications

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“…In addition to electrons, oxygen plasma generates many reactive species, such as reactive oxygen, atomic oxygen (O), ozone (O 3 ), superoxide anion (•O 2 − ), peroxide (•O 2 −2 ). After interaction with hydrogen atoms, hydrogen peroxide (H 2 O 2 ), hydroxyl radical (•OH) and hydroxyl ion (OH − ) can also be formed [ 81 , 82 ]. These reactive species can react with HMDSO fragments, as well as with the formed hydrocarbons.…”

Section: Resultsmentioning

confidence: 99%

Highly Hydrophobic Organosilane-Functionalized Cellulose: A Promising Filler for Thermoplastic Composites

et al. 2021

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The aim of this work is to design and optimize the process of functionalization of cellulose fibers by organosilane functional groups using low-pressure microwave plasma discharge with hexamethyldisiloxane (HMDSO) precursor in order to prepare a compatible hydrophobic filler for composites with nonpolar thermoplastic matrices. Particular attention was paid to the study of agglomeration of cellulose fibers in the mixture with polypropylene. In our contribution, the dependence of the surface wettability on used process gas and treatment time was investigated. Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) analyses were applied to characterize the surface morphology and chemical composition of the cellulose fibers. It was observed that the plasma treatment in oxygen process gas led to the functionalization of cellulose fibers by organosilane functional groups without degradation. In addition, the treated cellulose was highly hydrophobic with water contact angle up to 143°. The use of treated cellulose allowed to obtain a homogeneous mixture with polypropylene powder due to the significantly lower tendency of the functionalized cellulose fibers to agglomerate.

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Section: Resultsmentioning

confidence: 99%

Highly Hydrophobic Organosilane-Functionalized Cellulose: A Promising Filler for Thermoplastic Composites

et al. 2021

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“…and, consequently, promote further chemical reactions in the afterglow/deposition zone. An interaction of high energy photons with deposited film can (i) reduce the deposition rate by the resputtering process, (ii) cause a loss of non‐fouling film properties or (iii) modify the surface of the film by increasing the degree of cross‐linking 22–30. Last but not least, interaction of Ar( 3 P 0 ) and Ar( 3 P 2 ) metastable species carrying more than 11 eV with polymer film surface should be considered.…”

Section: Discussionmentioning

confidence: 99%

Surface DBD for Deposition of PEO‐Like Plasma Polymers

Gordeev¹,

Šimek²,

Prukner³

et al. 2011

Plasma Processes & Polymers

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This work investigates the possibility to prepare PEO‐like plasma polymers by using an AC surface dielectric barrier discharge in argon with admixtures of di(ethylene glycol) monovinyl ether vapors at atmospheric pressure. The surface discharge was driven in an amplitude‐modulated regime with a driving AC frequency of 5 kHz with a variable discharge duty cycle of 0.2–0.8. Deposition of plasma polymers was tested for variable argon flow rate of 0.5–2 slm and for various distances between the discharge electrode surface and deposition substrates. The measurements of electro‐optical discharge characteristics and infrared analysis of deposited films were performed to fix suitable deposition conditions. Best retention of PEO‐like character was obtained for the following conditions: the distance between substrates and discharge surface of 3 mm, argon flow rate of 1 slm, excitation AC high voltage of 2.2 kV (peak‐to‐peak) and discharge duty cycle of 0.4.

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“…[34][35][36] Therefore, the characteristic decay time of the metastable Ar m * can be estimated to also be less than 1 ls. This species is quickly converted to the excited Ar 2 * through three-body collisions.…”

Section: Excited Oh * and Ar M * Speciesmentioning

confidence: 99%

Atmospheric-pressure plasma jets: Effect of gas flow, active species, and snake-like bullet propagation

Wang

Huang

et al. 2013

Physics of Plasmas

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Cold atmospheric-pressure plasma jets have recently attracted enormous interest owing to numerous applications in plasma biology, health care, medicine, and nanotechnology. A dedicated study of the interaction between the upstream and downstream plasma plumes revealed that the active species (electrons, ions, excited OH, metastable Ar, and nitrogen-related species) generated by the upstream plasma plume enhance the propagation of the downstream plasma plume. At gas flows exceeding 2 l/min, the downstream plasma plume is longer than the upstream plasma plume. Detailed plasma diagnostics and discharge species analysis suggest that this effect is due to the electrons and ions that are generated by the upstream plasma and flow into the downstream plume. This in turn leads to the relatively higher electron density in the downstream plasma. Moreover, high-speed photography reveals a highly unusual behavior of the plasma bullets, which propagate in snake-like motions, very differently from the previous reports. This behavior is related to the hydrodynamic instability of the gas flow, which results in non-uniform distributions of long-lifetime active species in the discharge tube and of surface charges on the inner surface of the tube. V C 2013 American Institute of Physics.

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Effects of oxygen addition to argon glow discharges: A hybrid Monte Carlo-fluid modeling investigation

Cited by 61 publications

References 71 publications

Highly Hydrophobic Organosilane-Functionalized Cellulose: A Promising Filler for Thermoplastic Composites

Highly Hydrophobic Organosilane-Functionalized Cellulose: A Promising Filler for Thermoplastic Composites

Surface DBD for Deposition of PEO‐Like Plasma Polymers

Atmospheric-pressure plasma jets: Effect of gas flow, active species, and snake-like bullet propagation

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