Energetics of Molecular Excitation, Fragmentation, and Polymerization in a Dielectric Barrier Discharge with Argon Carrier Gas

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• 作者：Sean Watson ; Bernard Nisol ; Sophie Lerouge ; Michael Robert Wertheimer
• 刊名：Langmuir
• 出版年：2015
• 出版时间：September 22, 2015
• 年：2015
• 卷：31
• 期：37
• 页码：10125-10129
• 全文大小：256K
• ISSN：1520-5827

文摘

We report experiments at atmospheric pressure (AP) using a dielectric barrier discharge (DBD) reactor designed for plasma polymerization (PP) with 鈥渕onomers鈥?at 鈥?concentrations in ca.10 standard liters per minute of argon (Ar) carrier gas. We have perfected a method for measuring E_g, the energy dissipated per cycle of the applied a.c. high voltage, V_a(f), but the focus here is on 螖E_g, the energy difference with and without a flow, F_d, of monomer in the Ar flow, with the plasma being sustained at V_a(f) = 2.8 kV_rms, f = 20 kHz. From 螖E_g and F_d, we derive a characteristic energy per molecule, E_m (in eV), and investigate plots of E_m versus F_d and 1/F_d for three model 鈥渕onomers鈥? formic, acetic, and acrylic acid. These data, along with those for lighter or heavier organic compounds, reveal novel information about energy absorption from the plasma and ensuing polymerization reactions.