Papers by Author: Krzysztof Domański

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Authors: Krzysztof Domański, Piotr Prokaryn, Daniel Tomaszewski, Michał Marchewka, Piotr Grabiec
Abstract: A setup for a thermal energy harvesting based on a conversion of a thermal energy into a mechanical energy followed by a conversion of the mechanical energy into an electric field energy has been developed. The key elements of such a setup are a bimetal spring and electrodes covered by electret layers with a permanent charge. The electrodes are kept at different temperatures. The bimetal spring exchanges the thermal energy with the "hot" and "cold" electrodes. The heating and cooling stimulates the spring vibratios. During the vibrations the spring acts as a common plate of two variable capacitors. The electrodes with the electret layers are the fixed plates of these capacitors. The charge induced continuously at the plates of the capacitors is transferred via a rectifying circuit to the external capacitor.Several aspects of the setup development have been considered, including different electret materials, different methods of the electret charging, and different load capacitors.A compact model of the charging effect has been also developed. It has been implemented in Qucs program, where it is represented as a so-called equation defined device component.
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Authors: Dariusz Szmigiel, Krzysztof Domański, Piotr Grabiec
Abstract: We investigated the plasma etching of polysiloxane intended for use in cochlear implants as a protection layer. The processing was performed using fluorine-based chemistry ionized in RIE (Reactive Ion Etching) or ICP (Inductively Coupled Plasma) discharge. The effect of temperature on polysiloxane etch rate and the resulting surface morphology was examined. XPS was employed to determine chemical changes induced by plasma treatment. The cytotoxicity on a cell line was observed in order to estimate suitability of plasma processed silicone elastomer for use in biomedical applications. This paper presents the selected results, which reveals how the polysiloxane surface properties can change depending upon plasma treatment conditions. Exemplary micro devices encapsulated in plasma treated silicone elastomer are also shown.
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