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The surface microdischarge in atmospheric-pressure He/N2 mixture is studied with an emphasis on its emission characteristics. It is found that the emission intensity and the pattern shape are strongly dependent on the N2 concentration. The UV emission intensity increases by a factor of nine with the N2 concentration up to 5%, after that it decreases moderately. Meanwhile, the luminous pattern expands...
The susceptibility of the biofilm-forming bacterium Pantoea agglomerans to the lethal effects of cold atmospheric gas plasmas was investigated. When biofilms of P. agglomerans were produced on membranes and treated using a gas plasma, young biofilms (< 10 h old) showed viability reductions of between 4 and 5 log10 when treated for 300 s. Biofilms aged 20 or 30 h were reduced by approximately...
In recent years, a growing amount of literature suggests that the bactericidal effect of low-temperature atmospheric-pressure plasmas is chemistry driven. Antibacterial species generated by plasmas, such as O, OH, 1O2, and H2O2, are capable of reacting strongly to the substance in bacteria, resulting in bacterial inactivation. However, since bacteria cells are usually embedded in solution/tissue in...
Cold atmospheric-pressure plasmas have received much attention; mainly rely on the potential use of reactive species generated in such plasmas. In most cases of application, such as plasma medicine, the reactive species have effects on a sample only after their penetration through the plasma sheath that is formed above the sample. In contrast to studies of generation and optimization of reactive species...
Ultra height molecular weight polyethylene (UHMWPE) is widely used in joint replacements devices. It is highly biocompatibility but its reduced resistance to wear is a serious limitation to employment as, potentially, the longevity of such devices is reduced. Numerous techniques have been employed to increase the resistance to wear of UHMWPE with different degree of success; but they all require expensive...
This paper reports an electrical and optical characterization study of an atmospheric pressure plasma generator used for decontaminating endoscopic channels. In order to sustain such plasma in a narrow channel of up to one meter, two electrode configurations are discussed. Plasma characteristics such as the discharge current, dissipated power, gas temperature are measured, together with optical emission...
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