Praxisnahe Charakterisierung von Kunststoffen fluidischer Systeme von Analysatoren hinsichtlich Sauerstoffaustauschvorgängen

Translated title of the contribution: Service near characterisation of the oxygen exchange properties of plastics for fluidic systems of analyzers

Marlene Knausz

Research output: ThesisMaster's Thesis

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Abstract

In this master thesis, a novel test setup to characterize the oxygen increase of liquids in blood analyzers was implemented. For this purpose an optochemical sensor, embedded in a cell made of steel, was used. The measurement principle was tested with seven selected tube-materials. With the developed practice-relevant test sequences, it was possible to give information about the oxygen exchange properties of the materials. One of the selected materials, a copolymer, showed by far the best practice-relevant properties (lowest oxygen increase) and is performing even better than steel pipes. Another conclusion is that a thermoplastic elastomer can replace a more expensive rubber in an analyzer, as it shows similar oxygen exchange behaviour. Furthermore it was possible to give information about the oxygen exchange behaviour of a multilayer, two thermoplastics and a further selected thermoplastic elastomer. The permeation coefficient was found to be suitable for the pre-selection of materials with providing an idea of the magnitude of the oxygen increase within the operational sequences of a blood analysis device. Because of the significant influence of the sorption on the oxygen exchange behaviour there is a need for practice-relevant tests when comparing two materials directly. An important material-independent pump-effect, which contributes to an increase of the oxygen, was identified. At the air/liquid phase boundary, a diffusion-induced O2-uptake occurs, that is transported inside the liquid due to laminar flow conditions.
Translated title of the contributionService near characterisation of the oxygen exchange properties of plastics for fluidic systems of analyzers
Original languageGerman
QualificationDipl.-Ing.
Supervisors/Advisors
  • Pinter, Gerald Gerhard, Supervisor (internal)
  • Ickinger, Simon, Supervisor (external)
  • Buder-Stroißnigg, Michael, Co-Supervisor (internal), External person
Award date17 Dec 2010
Publication statusPublished - 2010

Bibliographical note

embargoed until 16-11-2015

Keywords

  • Oxygen exchange
  • analyzers
  • characterisation of plastics

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