Atmospheric-pressure plasma enhanced chemical deposition: role of the reactor flow dynamics

Descamps, P.; Asad, Syed Salman; Wilde, Juray De

doi:10.1088/0022-3727/46/36/365201

Cited by 7 publications

(7 citation statements)

References 19 publications

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“…For efficient ozone production, it is required to minimize the ratio of kδ/k1 + k2 (α). Many reports stated that the lowest α is acquired with the 100-200 Td (Td: Electric field over Particle number density) of reduced electric field, in which Sabadil et al (1980) calculated 4 of theoretical minimum α at 110 Td (Bogaerts et al 2002;Descamps et al 2013;Liu et al 2012). This indicates that a single atom oxygen essential for ozone generation is generated in the filament channel.…”

Section: Optimum Discharge Pressurementioning

confidence: 99%

“…By decreasing the gap distance at a constant gas flow rate makes the flow velocity faster in the discharge area. Blurred filament channels by gas flow, so called afterglow plasma, has influence on the filament size and the arrangement in the discharge area so that the filament volume and spacing increases (Descamps et al 2013;Liu et al 2012). According to the results, the fact that the optimum pressure increases by decreasing the gap distance can be explained by the blurred filament, which becomes more effective as the gas flow velocity increases.…”

Section: Optimum Discharge Pressurementioning

confidence: 99%

“…In the plasma channel, ozone production also takes place even after the dissociation of ozone molecule is generated. According to several reports, the reaction rate of ozone dissociation is 6-8 times higher than the dissociation rate of oxygen molecule in the discharge channel (Descamps et al 2013;Liu et al 2012).…”

Section: Introductionmentioning

confidence: 97%

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Optimizing Factors on High Concentration of Ozone Production with Dielectric Barrier Discharge

Seok

Jeong

Jung

et al. 2014

Ozone: Science & Engineering

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The gap distance, electrode material, voltage and gas flow velocity were optimized with gas pressure variation of dielectric barrier discharge (DBD) for producing high concentration of ozone. There exists an optimum gas pressure at which the highest ozone concentration is produced with other parameters being fixed. This optimum gas pressure value changes accordingly as the other parameters changed. As the discharge continues at the optimum pressure, the ozone concentration could increase or decrease slowly. This aging effect has different characteristics with the metal electrode material and the impurity level of the oxygen gas used for ozone generation. The aging effect is supposed to be related with the catalytic effect of metal oxide, which is generated in the discharge zone. The change in the characteristic of optimum pressure by the other parameters, indicate that the ozone concentration is deeply related with the filament self-organization characteristics of DBD. At the final optimized condition, the ozone concentration was higher than 22.5 wt.%.

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Section: Optimum Discharge Pressurementioning

confidence: 99%

Section: Optimum Discharge Pressurementioning

confidence: 99%

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Optimizing Factors on High Concentration of Ozone Production with Dielectric Barrier Discharge

Seok

Jeong

Jung

et al. 2014

Ozone: Science & Engineering

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“…However, conventional APPJs have difficulty in realizing plasma polymerization due to the low plasma energy in ambient air conditions; as a result, they would not feed enough energy for activation to the monomers. In spite of intensive studies, only a few groups have reported successful plasma polymerization using APPJs [ 40 , 41 , 42 , 43 , 44 ]. Nonetheless, most plasma polymer films grown using the APPJs tend to show poor film qualities, such as low molecular weight and weak chemical stabilities, which would inherently result from the use of plasma with low density and electron temperature in monomer fragmentation (or active) and recombination (or passive) regions.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Nanofibrous Polyaniline Thin Film Prepared by Novel Atmospheric Pressure Plasma Polymerization Technique

et al. 2016

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This work presents a study on the preparation of plasma-polymerized aniline (pPANI) nanofibers and nanoparticles by an intense plasma cloud type atmospheric pressure plasma jets (iPC-APPJ) device with a single bundle of three glass tubes. The nano size polymer was obtained at a sinusoidal wave with a peak value of 8 kV and a frequency of 26 kHz under ambient air. Discharge currents, photo-sensor amplifier, and optical emission spectrometer (OES) techniques were used to analyze the plasma produced from the iPC-APPJ device. Field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), gas chromatography-mass spectrometry (GC-MS), and gel permeation chromatography (GPC) techniques were used to analyze the pPANI. FE-SEM and TEM results show that pPANI has nanofibers, nanoparticles morphology, and polycrystalline characteristics. The FT-IR and GC-MS analysis show the characteristic polyaniline peaks with evidence that some quinone and benzene rings are broken by the discharge energy. GPC results show that pPANI has high molecular weight (Mw), about 533 kDa with 1.9 polydispersity index (PDI). This study contributes to a better understanding on the novel growth process and synthesis of uniform polyaniline nanofibers and nanoparticles with high molecular weights using the simple atmospheric pressure plasma polymerization technique.

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“…However, it should be emphasized here that it is very difficult to operate in a completely air‐free environment for atmospheric pressure in‐line processing; in practice, there is always a non‐negligible quantity of air/oxygen entrained to the reactor. Recognition of this operational consequence is essential, particularly when considering plasma deposition techniques that require the discharge atmosphere to be carefully adjusted . An additional problem is that plasma deposition techniques typically require steady, diffuse plasmas; reliable control of such homogeneous discharges is generally agreed to be difficult at atmospheric pressure except under very specific operating conditions and limited gas compositions.…”

Section: Challenges In Plasma Sciencementioning

confidence: 99%

White paper on the future of plasma science for optics and glass

Šimek

Černák

Kylián

et al. 2018

Plasma Processes & Polymers

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This paper reflects on the future of low-temperature plasma science in relation to the manufacturing and novel uses of glass. The text summarizes the current state of the art on the major topics discussed, such as glass processing, optics and photonics, healthcare issues, building and fenestration applications. It also identifies several challenges that are driven by applications, and which are compatible with roadmaps for their respective industries. The frontiers of plasma science are discussed, for example, in relation to the use of plasmas as an active optical element in fast-response adaptive optics systems, optical metamaterials, and the development of next-generation nanolithography. Future demand for the successful implementation of plasma-based technologies in the glass, optics, and photonic industries will depend on further progress in plasma science. Hence, some needs and recommendations concerning both fundamental and applied plasma research are summarized.

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Atmospheric-pressure plasma enhanced chemical deposition: role of the reactor flow dynamics

Cited by 7 publications

References 19 publications

Optimizing Factors on High Concentration of Ozone Production with Dielectric Barrier Discharge

Optimizing Factors on High Concentration of Ozone Production with Dielectric Barrier Discharge

Synthesis and Characterization of Nanofibrous Polyaniline Thin Film Prepared by Novel Atmospheric Pressure Plasma Polymerization Technique

White paper on the future of plasma science for optics and glass

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