Determination of active species in the modification of hardwood samples in the flowing afterglow of N2 dielectric barrier discharges open to ambient air
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- 作者：J. Prégent ; L. Vandsburger ; V. Blanchard ; P. Blanchet ; B. Riedl ; A. Sarkissian…
- 关键词：Wood ; Wettability ; Plasma processing ; Lignin precipitation
- 刊名：Cellulose
- 出版年：2015
- 出版时间：February 2015
- 年：2015
- 卷：22
- 期：1
- 页码：811-827
- 全文大小：1,659 KB
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11. Busnel F, Blanchard V, Prégent J, Stafford L, Riedl B, Blanchet P, Sarkissian A (2010) Modification of sugar maple ( / Acer saccharum) and black spruce ( / Picea mariana) wood surfaces in a dielectric barrier discharge (DBD) at atmospheric pressure. J Adhes Sci Technol 24(8-0):1401-413 CrossRef
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16. Donnelly VM, Malyshev MV (2000) Diagnostics of inductively coupled chlorine plasmas: measurements of the neutral gas temperature. Appl Phys Lett 77(16):2467 CrossRef < - 作者单位：J. Prégent (1)
L. Vandsburger (1)
V. Blanchard (2)
P. Blanchet (2) (3)
B. Riedl (3)
A. Sarkissian (4)
L. Stafford (1)
1. Département de Physique, Université de Montréal, C.P. 6128, Succ. Centre-ville, Montréal, QC, H3C 3J7, Canada
2. FPInnovations, 319 Franquet, Québec, QC, G1P 4R4, Canada
3. Centre de Recherche sur les Matériaux Renouvelables, Université Laval, 2425 Rue de la Terrasse, Québec, QC, G1V 0A6, Canada
4. Plasmionique, 1650 boul. Lionel Boulet, Varennes, QC, J3X 1S2, Canada - 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Bioorganic Chemistry
Physical Chemistry
Organic Chemistry
Polymer Sciences - 出版者：Springer Netherlands
- ISSN：1572-882X
文摘
Sugar maple (Acer saccharum, Mill.) wood samples were exposed to the flowing afterglow of a N2 dielectric barrier discharge (DBD) open to ambient air. Freshly-sanded wood surfaces were hydrophilized by the treatment. The dynamic behaviour of water droplets on hardwood samples further reveals a volumetric effect of treatment as well as a modification of the topmost surface. Analysis of the discharge properties by optical emission spectroscopy (OES) indicates that the neutral gas temperature (determined from the rovibrational spectrum of N2) was close to room temperature, thus ruling out wood modification due to heat transfer. OES spectra combined with a collisional-radiative model also reveals significant concentration of metastable N2(A) states and UV photons (in particular those from the NOγ system in the 200-00?nm range) in the discharge. To better examine the role of UV irradiation, wood samples were exposed to the late afterglow of a low-pressure N2/O2 plasma optimized for UV emission from the NO systems. Wood hydrophilization was observed only for samples directly exposed to the late afterglow and not for those contained in a UV-transparent enclosure. Wood hydrophilization in the DBD is thus not directly related to UV irradiation; these energetic photons rather participate [along with N2(A) metastables] in the formation of other active species, in particular atomic oxygen and ozone due to the open-air configuration. The role of ozone was confirmed by treatments in an ozone generator, showing dynamic wettability comparable to the ones achieved after treatment in the flowing afterglows of the atmospheric-pressure N2 DBD and low-pressure N2–O2 plasma. FTIR spectra of wood samples treated in the three systems (DBD, N2–O2 plasma, and ozone generator) indicate an increased lignin content due to the possible development of lignin precipitates, corroborating the effect of atomic oxygen and ozone.