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Atmospheric Pressure Plasma (atmospheric + pressure_plasma)
Selected AbstractsLow Temperature Growth of Photoactive Titania by Atmospheric Pressure PlasmaPLASMA PROCESSES AND POLYMERS, Issue 9 2009John L. Hodgkinson Abstract Atmospheric pressure glow discharge plasma CVD was used to deposit thin films of titania at 200,°C using two different precursors. The resulting films were characterised using techniques including XPS, RBS and XRD. It was established that annealing at temperatures as low as 275,°C produced crystalline films that were photocatalytically active. When annealed at 300,°C the photoactivity was greater than that of commercially available "self-cleaning" titania films. The effects of the different precursors, annealing times and temperatures on the crystallinity and photoactivity are discussed. [source] Functional finishing by using atmospheric pressure plasma: Grafting of PET nonwoven fabricJOURNAL OF APPLIED POLYMER SCIENCE, Issue 6 2007Younsook Shin Abstract Poly (ethylene terephtalate) (PET) nonwoven fabric was treated with He/O2 plasma to produce peroxides and grafted with acrylic acid (AA) for introducing carboxyl groups onto PET surface. The graft yield increased with AA concentration from 1.5M to 2.5M, and then decreased with further increase in AA concentration. Graft yield increased with sodium pyrosulfite (SPS) concentration from 0.005M to 0.02M, and then decreased with further increase of SPS concentration. X-ray photoelectron spectroscopy results indicated that both of plasma treatment and AA grafting increased oxygen content and decreased carbon content on the PET nonwoven fabric surface. The grafted PET nonwoven fabric showed increase in moisture regain and dye uptake. And drastic increase in wettability was observed after grafting. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 3655,3659, 2007 [source] Effect of plasma treatment and electron beam radiations on the strength of nanofilled adhesive-bonded jointsPOLYMER ENGINEERING & SCIENCE, Issue 8 2010H.M.S. Iqbal This investigation highlights the adhesion performance of carbon fiber- and glass fiber-reinforced polyphenylene sulfide when joined by high-performance neat epoxy adhesive and nanofilled epoxy adhesive. A significant increase in the surface energy of these materials is observed after the surface modification with atmospheric plasma treatment. An increase in surface roughness is observed after exposing the surface to plasma. Lap shear testing of untreated and plasma-treated joints is carried out to correlate the improvement in adhesion properties with the joint strength. A considerable increase in joint strength is observed when the surfaces of these materials are modified by atmospheric pressure plasma. There is a further increase in joint strength when the composites are joined by nanofilled epoxy adhesive, and subsequent exposure to electron beam radiations results in minor increase in the joint strength. Finally, the fractured surfaces of the joints are examined and the analysis is performed. POLYM. ENG. SCI., 50:1505,1511, 2010. © 2010 Society of Plastics Engineers [source] Laser scanning confocal microscope characterization of dye diffusion in nylon 6 fibers treated with atmospheric pressure plasmasJOURNAL OF APPLIED POLYMER SCIENCE, Issue 3 2008Chunxia Wang Abstract The effect of atmospheric pressure plasma treatment on wettability and dyeability of nylon 6 fibers is investigated. The plasma treatments resulted in an average of 10°,20° decrease in the advancing contact angle and 20°,30° decrease in the receding contact angle. An increased dye diffusion rate of nylon 6 fibers was observed using laser scanning confocal microscope (LSCM). Scanning electron microscope confirmed that the fiber surfaces were roughened, and X-ray photoelectron spectroscopy showed that the polar groups on the fiber surfaces increased after the plasma treatments. As the plasma treatment time increased, a greater degree of etching was achieved and more polar groups such as hydroxyl and carboxyl groups produced on the surfaces of the nylon 6 fibers, leading to a better wettability and thus a better dyeability of the fiber. This study proved that LSCM may be effectively used in detecting the change of dye diffusion rate in nylon fibers treated with plasmas and the mounting medium should have a close refractive index as the fiber to avoid distortion of the fiber cross section image. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 [source] Cover Picture: Plasma Process.PLASMA PROCESSES AND POLYMERS, Issue 9 2006Polym. Cover: The photographs show atmospheric pressure plasmas generated by microwave discharges. Relatively high density plasmas are generated in a 1 cm inner diameter quartz tube. The thermal damage of the quartz tube is avoided by the rotating gas flow in line with the inner wall of the quartz tube. The part, which looks silver, is the sidewall of the flat rectangular waveguide. The color of the light emission changes with different working gases. These photographs show the appearances of the emission of Ar, Ar,+,N2, and Ar,+,H2O, from the left. These photographs are offered from the Plasma Laboratory of Musashi Institute of Technology, Tokyo. [source] | ||||||||||