The current invention addresses the needs for a source of ultraviolet (UV) radiation, in particular UV A and UV B radiation with negligible amount of radiation in the visible and infra-red range. Against the state of the art the innovative device causes negligible heating of materials upon irradiation with the source and is thus suitable for treatment of materials whose temperature should remain almost unchanged even upon prolonged treatment. The innovative device is suitable for irradiation of heat-sensitive materials and will be useful for numerous applications such as destruction of bacteria, viruses, spores, fungi and eventual sterilization of heat-sensitive materials as well as UV curing of thin layers of heat-sensitive materials.
F.32 International patent
COBISS.SI-ID: 29162791Polymer PET was treated in sulfur-containing plasmas to incorporate different sulfur functional groups to improve its hemocompatibility properties. Plasma was created either in SO2, H2S and H2S/O2 mixture. In one case, also sequential treatment in H2S and O2 plasma was used. The surface of treated samples was analyzed using X-ray photoelectron spectroscopy and surface hemocompatibility was tested by investigating platelet adhesion. Whereas SO2 plasma caused functionalization of the surface with –SO3 and –SO4 functional groups, H2S plasma caused functionalization with non-oxidized sulfur groups –SH2, as well as deposition of sulfur to the polymer surface. Addition of oxygen to H2S gas caused significant decrease of sulfur amount on the polymer surface and only minor sulfur oxidation. This observation led to the conclusion that added oxygen removed/prevented deposition of sulfur to the polymer surface. Better results were obtained by sequential treatment in H2S followed by O2 plasma treatment, where oxidation of sulfur and formation of –SO and –SO2 functional groups was observed. Exposure to O2 plasma had to be short enough to prevent unwanted removal of sulfur from the surface. High platelet adhesion was observed for all plasma-treated surfaces.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 28923175