Characterization of an Atmospheric Air Non-thermal Plasma Device in Relation to Ozone Production

Lim, Marcus; Jayapalan, Kanesh Kumar; Zulkifli, Ahmad Zulazlan Shah; Hassan, Hamdan; Lai, Kailok; Chin, O. H.

doi:10.18178/ijesd.2017.8.1.919

Cited by 5 publications

(1 citation statement)

References 19 publications

(23 reference statements)

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“…Similar results have been reported by Peters et al [21], where the surface free energy increased after plasma treatments of 30-90 s, at electron energies of 9.8-12.6 eV (electron temperatures of 76-106.7×10 3 K). In this study, the electron energy is much lower at 6.6 eV (50.6×10 3 K), however the treatment time is significantly longer at 0.5 and 1 h (the procedures for determining the electron energy and temperature are reported elsewhere [22]). Figure 3 shows the SEM images of the pulverized EFB samples.…”

Section: Resultsmentioning

confidence: 85%

Investigation of biomass surface modification using non-thermal plasma treatment

Lim

Zulkifli

2018

Plasma Sci. Technol.

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The effects of non-thermal plasma (NTP) treatment on biomass in the form of pulverized palmbased empty fruit bunches (EFB) are investigated. Specifically, this study investigates the effects of NTP treatment on the surface reactivity, morphology, oxygen-to-carbon (O/C) ratio of the EFB at varying treatment times. The surface reactivity is determined by the reaction of antioxidant functional groups or reactive species with 2,2-diphenyl-1-picrylhydrazyl (DPPH). By measuring the concentration of the DPPH with a spectrophotometer, the change in the amount of antioxidant functional groups can be measured to determine the surface reactivity. The reactions of the various lignin components in the EFB with respect to the NTP treatment are discussed by qualitatively assessing the changes in the Fourier transform infrared (FTIR) spectra. The surface morphology is examined by a scanning electron microscope. To determine the amount of oxygen deposited on the EFB by the air-based NTP treatment, the oxygen and carbon contents are measured by an energy dispersive x-ray detector to determine the O/C ratio. The results show that the NTP reactor produced reactive species such as atomic oxygen and ozone, increasing the surface reactivity and chemical scavenging rate of the EFB. Consequently, the surface morphology changed, with an observed rougher surface from the images of the EFB samples. The change in the appearance of the surface is accompanied by a high O/C ratio, and is caused by reactions of certain components of lignin due to the NTP treatment. The lignin component that was modified is believed to be syringyl, as the syringyl portion in the lignin of EFBs is higher compared to the other components. Syringyl components are detected in the range of FTIR wavenumbers of 1109-1363 cm −1. With increasing NTP treatment times, the absorbance (of the peaks in the FTIR spectra) for syringyl related C−H and lignin associated C=C bonds decreases as the syringyl decomposes. The resulting release of carboxyl compounds increases the absorbance for the carbonyl C=O group. The results show that NTP treatment is able to modify the surface properties of EFB, and that the surface reactivity can be increased to improve their conversion and processing efficiencies.

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Section: Resultsmentioning

confidence: 85%

Investigation of biomass surface modification using non-thermal plasma treatment

Lim

Zulkifli

2018

Plasma Sci. Technol.

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Investigation of Non-thermal Plasma Assisted Combustion of Solid Biomass Fuels: Effects on Flue Gas Composition and Efficiency

Lim¹,

Lea‐Langton

2020

Plasma Chem Plasma Process

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Intensity control of individual DBD plasma filament. I. Experiment with a needle electrode

Paliwoda

Rovey

2017

Physics of Plasmas

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Filamentary volume dielectric barrier discharge (DBD) produces patterned plasma structures that are currently being explored for reconfigurable metamaterial applications. In this work, the presence and intensity of a single filament (within an array of filaments) are controlled by biasing a low voltage needle electrode by less than 7% of the driving voltage. The current, voltage, and time-averaged normalized light intensity were measured while varying the needle voltage through self-biasing resistors. For a 7.5 kV, 3.2 kHz DBD in air, the needle-controlled filament intensity varies from 80% to 0% of the light intensity of surrounding filaments. When the biased voltage prevents a filament from forming, the voltage difference across the air gap and between the electrodes remains well above the breakdown voltage. Redistributed charge inside the DBD rather than the cross-gap voltage difference is the mechanism which controls the filament intensity when surrounding filaments are present. This work presents a method for controlling an array of plasma filaments with needle electrodes, at voltage biases more manageable for a control circuit.

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Characterization of an Atmospheric Air Non-thermal Plasma Device in Relation to Ozone Production

Cited by 5 publications

References 19 publications

Investigation of biomass surface modification using non-thermal plasma treatment

Investigation of biomass surface modification using non-thermal plasma treatment

Investigation of Non-thermal Plasma Assisted Combustion of Solid Biomass Fuels: Effects on Flue Gas Composition and Efficiency

Intensity control of individual DBD plasma filament. I. Experiment with a needle electrode

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