Faculty of Physics - University of Bucharest

UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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2024-11-22 1:48

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Conference: Bucharest University Faculty of Physics 2013 Meeting

Section: Optics, Spectroscopy, Plasma and Lasers

Title:

Characterization of the impact of RF and DC plasma on wood structure

Authors:

A. Avram (1,2), V. Covlea (3), M. Bazavan (3), B. Butoi (3), B. Bita (1,3), A. Jipa (3) and E.S.Barna (3)

Affiliation:

1)National Institute for R&D in Microtechnologies, 126A Erou Iancu Nicolae street, 023573, Bucharest, Romania

2.Faculty of Electrical Engineering, University “Politehnica” of Bucharest, 313 Splaiul Independentei, 060042, Bucharest Romania

3.Faculty of Physics, University of Bucharest, 405 Atomistilor street, 077125, Magurele, Romania

E-mail

bogdan.bita@IMT.ro; andrei.avram@imt.ro ; vanea.covlea@yahoo.com

Keywords:

RF plasma, DC plasma, wood treatment, surface functionalisation

Abstract:

Wood treatment with plasma has been studied as a potential new method for decontamination and enhancing it’s properties in terms of durability, fungi and pest protection. The experiments have been performed in two types of plasma, RF plasma discharge and reflex plasma. Hard and soft essence wood, usually present in the furniture and building industry was exposed to DC reflex plasma or RF plasma. The RF plasma discharge studies are performed in a capacitive reactor (Sentech Instruments), using a 13,56 MHz radio frequency source, at 10-50 W power, 225 – 450 mTorr pressure, using either Argon. The DC reflex plasma discharge studies were performed in a custom built reactor using nitrogen gas, at a discharge current of 50 - 200 mA, voltage 400 - 900 V, and pressure of 1 - 100 Pa. Plasma exposed and unexposed wood samples were investigated by SEM (Scanning electron microscopy) and contact angle measurements were performed using a goniometer. The study results have shown a noticeable variation of the contact angle of water droplets to the surface of the wood samples, depending on the type of plasma treatment and on the type of wood sample. Also, SEM investigations have revealed surface morphological modifications occurring in DC reflex plasma, but not in RF plasma. The SEM investigations and contact angle measurements have revealed noticeable differences between wood samples treated in RF plasma and DC reflex plasma, which need further investigation in order to fully describe the interaction between plasma and wood. This paper presents preliminary studies for surface modifications which occur during the exposure of wood to RF and DC reflex plasma.