Abstract: The present invention relates to the treatment of internal surfaces of a hollow body, on the inner surfaces of which areas having different surface properties, for example, having hydrophilic and hydrophobic properties, are produced. The invention further relates to fluid separators that are based on said hollow bodies and that have areas having different surface properties. Such fluid separators are used in medical technology and analysis, in particular biochemical analysis.

Abstract: The present invention relates to a plasma generating device having a first and a second electrode (3, 4) which are at a spacing from each other for generating a plasma (13) between the two electrodes (3, 4), a dielectric (8) which is disposed between the two electrodes (3, 4), a gas inlet (10) in the space between the two electrodes (3, 4) for supply of a plasma generating gas (12), one of the two electrodes (3, 4) having at least one opening (5) as gas outlet from the space between the two electrodes (3, 4), through which the plasma (13), which can be generated between the two electrodes (3, 4), can be expelled parallel to the direction of the electrical field which can be produced by the two electrodes (3, 4) between the two electrodes (3, 4), a grating, net and/or fabric (1) being disposed across the cross-section of the at least one opening (5).