Lignite oxidative desulphurization: notice 3—process technological aspects and application of products

International Journal of Coal Science & Technology - The study reviews the process of oxidative desulphurization of high-sulphur Ukrainian lignite, which was performed by coal treatment using...     

Polyurethane paint adhesion improvement on aluminium alloy treated by plasma jet and dielectric barrier discharge

The effect of atmospheric pressure plasma treatment on the adhesion between a protective coating and AA1100 alloy was investigated. Two plasma sources were used for surface modifications: atmospheric pressure plasma jet and dielectric barrier discharge. The surface roughness and water contact angle measurements were conducted in order to evaluate the changes on the aluminium surface after plasma processing. The paint coating was tested using the adhesion tape test (ASTM D3359). A significant improvement of surface wettability and adhesion was obtained after plasma treatments.     

Air plasma treatment of copper sheets using Diffuse Coplanar Surface Barrier Discharge

The treatment of copper sheets by atmospheric-pressure air plasma generated using the Diffuse Coplanar Surface Barrier Discharge was studied. The surface free energy measurements indicated a significant increase of the wettability after several seconds of plasma exposure. The atomic force microscopy technique revealed a relatively small increase of the surface roughness due to the plasma treatment. The observed increase of wettability, the influence of air humidity on treatment efficiency and the hydrophobic recovery of the plasma treated surfaces were studied by the x-ray photoelectron spectroscopy. A generation of surface -NO_x groups in humid air plasma was observed.