Argon-Oxygen Post-Discharge Treatment of Hexatriacontane: Heat Transfer between Gas Phase and Sample

Abstract

Characterization of the interaction between an argon-oxygen post-discharge and hexatriacontane (C36H74) is carried out. Optical emission spectroscopy using the atmospheric band O2 (b1Σg +, v=0 X3Σg −, v’=0) at 760 nm gives simultaneously the evolution of the O(3P) concentration above the surface and the gas temperature by simulation of the rotational spectrum of the transition. Surface reactions contribute to the heating in the sample and to a substantial increase in the gas temperature. Finally, a strong correlation between the time evolutions of the transition intensity and the sample temperature is observed, suggesting that O(3P) is the main reactive species that produces the heating and the chemical changes in the HTC.

Theoretical insight into Ar–O2surface-wave microwave discharges

“…O 2 and Ar-O 2 plasmas have been successfully used for oxide films deposition [9,10], synthesis of metal oxide nanowires [11], sterilization and decontamination of medical instruments [1,12,13,14,15] and polymer surface treatment [3,16,17,18]. Furthermore, the O( 1 D) atoms present in Ar-O 2 plasma were shown to have the potential for surface activation [2].…”

“…) transition [3,18], and one probe method that relies on the temperature rise of a catalytic probe due to the atomic recombination on the probe surface [23,24]. For the case of a pure O 2 surface wave microwave discharge the O-atoms density was obtained by VUV absorption spectroscopy downstream the discharge by Granier et al [25] for different discharge configurations and microwave frequencies.…”

Influence of neutral and charged species on the plasma degradation of the stearic acid

“…These reactions released a large amount of energy, which was sufficient to promote a significant heating of the gas 12 .…”

“…As the experiment started, the furnace was turned off, and the samples were only heated by the gas and by the energy deposited via surface reactions. In a previous publication 11,12 , we showed that the gas temperature is lower than the sample temperature by ~8 °C.…”

“…Several studies have been conducted to better understand the interaction mechanism between organic molecules and active and charged species generated in plasma treatments 5,4,11,12 . In these investigations, Hexatriacontane (HTC), which possesses only simple C-C and C-H bonds, was evaluated as a contaminant.…”