Determination of active species in the modification of hardwood samples in the flowing afterglow of N2 dielectric barrier discharges open to ambient air

Prégent, Julien; Vandsburger, Leron; Blanchard, Vincent; Blanchet, Pierre; Riedl, Bernard; Sarkissian, A.; Stafford, L.

doi:10.1007/s10570-014-0496-8

Cited by 27 publications

(35 citation statements)

References 58 publications

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“…Figure 4a shows a gradual increase of the contact angle as we increase the dose of plasma-produced species. This contrasts with our previous experiments of sugar maple wood treatment in N 2 DBDs where a dose threshold was needed before significant wettability changes could be observed (Prégent et al 2014). Also, Fig.…”

Section: Contact Angle Measurementscontrasting

confidence: 80%

“…1. This system was described in details in a previous publication (Prégent et al 2014;Riedl et al 2013). The system is open to ambient air and produces a spatially uniform or filamentary discharge between two quartzcovered circular metallic electrodes, having an area of 285 cm 2 , a diameter of 19 cm, and a 0.14 cm interelectrode gap.…”

Section: Dbd Setup and Plasma Diagnosticsmentioning

confidence: 99%

“…2a. For nominally pure N 2 plasmas, sanded surfaces became highly hydrophilic; a feature ascribed to the formation of ozone due to the open-to-air configuration (Prégent et al 2014). On the other hand, while no significant wettability change could be observed after exposure to an O 2 DBD, wood surfaces show an increase of the water contact angles after treatments to N 2 -O 2 DBDs with varying concentrations of O 2 (3:1, 1:1, and 3:1).…”

Section: Contact Angle Measurementsmentioning

confidence: 99%

“…According to recently published reports, the two main approaches for plasma treatment of wood surfaces consist of: an improvement of the surface adhesion to protective coatings by activation and/or the deposition of functional, nanostructured coatings through the introduction of precursors into the plasma. A more thorough description of the current state of plasma-induced modification of wood surfaces has been provided previously (Prégent et al 2014).…”

Section: Introductionmentioning

confidence: 99%

“…In a previous paper, the treatment of freshly-sanded hardwood samples (Acer saccharum, Marsh) in the flowing afterglow of an N 2 DBD open to ambient air was investigated (Prégent et al 2014). After treatment, contact angle measurements with water showed a hydrophilization of the surface.…”

Section: Introductionmentioning

confidence: 99%

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Modification of hardwood samples in the flowing afterglow of N2–O2 dielectric barrier discharges open to ambient air

et al. 2015

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The effect of O 2 addition in the gas feed of an open-to-air N 2 -O 2 dielectric barrier discharge (DBD) on the surface modification of sugar maple hardwood samples is reported. After treatment by N 2 -O 2 plasma, an increase of the contact angle with water and a decrease of the contact angle with diiodomethane was observed. X-ray photoelectron spectroscopy and Fourier-transform infra-red analyses further reveal a decrease of the O/C as well as increase of the C=O peak and surface aromaticity. When O 2 is added to the nominally pure N 2 DBD, the discharge transits from a homogeneous regime to a filamentary regime with increased dissipated power and neutral gas temperature. As a result, surface modification by N 2 -O 2 plasmas becomes similar to those occurring under a low-temperature heat treatment of wood surfaces. In such conditions, a mechanism involving the thermally-activated deacetylation and depolymerisation of hemicelluloses and cross-linking between lignin and furfural and hydroxylmethylfurfural, leading to the increase of wood hydrophobicity is proposed.

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Section: Contact Angle Measurementscontrasting

confidence: 80%

Section: Dbd Setup and Plasma Diagnosticsmentioning

confidence: 99%

Section: Contact Angle Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modification of hardwood samples in the flowing afterglow of N2–O2 dielectric barrier discharges open to ambient air

et al. 2015

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Influence of substrate outgassing on the plasma properties during wood treatment in He dielectric barrier discharges at atmospheric pressure

Levasseur

Gangwar

Profili

et al. 2016

Plasma Processes & Polymers

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This work analyzes the effect of wood outgassing on the properties of He dielectric barrier discharges operated in a homogenous regime. Over the 60 min wood treatment investigated, the discharge current increased by almost a factor of two due to the release of air and humidity. Based on optical emission spectroscopy and collisional-radiative modeling, these effects further yield to an increase of the electron temperature and a significant decrease of the relative number density of He metastable atoms. Experiments were also performed in presence of trace amounts of N 2 , O 2 , and dry air to simulate wood outgassing. The amount of air released from the wood sample decreased with plasma treatment time, with a two-slope first-order decay behavior.

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Characteristics of the flowing afterglow of a surface‐wave microwave discharge in a reactor loaded with a small diameter tube

Kutasi

Korolov

2017

Plasma Processes & Polymers

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Applying the flowing afterglow of an N2O2 surface‐wave microwave discharge it is shown, that using 500–1000 sccm gas flow rates the afterglow can efficiently travel through a 4.5 mm polymer tube placed into the afterglow reactor, as well as simultaneously inside and around the tube. The afterglow along the reactor loaded with a 5 mm I.D. quartz tube is followed through the UV emission of NO(B) molecules created in the three‐body re‐association process of N‐ and O‐atoms, and by modeling calculations. It is shown that by placing the tube into reactor the pressure and the density of species increase. Along the tube the absolute density of atoms decrease due to the pressure drop there, which can be controlled through the system's pumping efficiency.

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Determination of active species in the modification of hardwood samples in the flowing afterglow of N2 dielectric barrier discharges open to ambient air

Cited by 27 publications

References 58 publications

Modification of hardwood samples in the flowing afterglow of N2–O2 dielectric barrier discharges open to ambient air

Modification of hardwood samples in the flowing afterglow of N2–O2 dielectric barrier discharges open to ambient air

Influence of substrate outgassing on the plasma properties during wood treatment in He dielectric barrier discharges at atmospheric pressure

Characteristics of the flowing afterglow of a surface‐wave microwave discharge in a reactor loaded with a small diameter tube

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