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- Encapsulation (6)
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Course of studies
Passivated electrode side walls by atomic layer deposition on flexible polyimide based samples
(2020)
Langzeitstabile Verkapselungsschichten mit integriertem Feuchtesensor für aktive Mikroimplantate
(2012)
This work gives the theoretical background which is needed to understand what self-assembling monolayers are, how they work, how and for what they can be used. A closer look is taken on the possibility to create an area selective atomic layer deposition process. In a practical experiment the foundation for this process is laid. Therefor a silicon wafer is coated with gold using a evaporation process. The gold samples are exposed to the SAMs solution to grow them. Contact angle measurements as well as Fourier transform Infrared spectroscopy are used to check the existence of SAMs on the gold samples. Also there is investigated if different exposure times make any differences.
In the course of researching a bellows to encapsulation the mechanical unit of a moving active implant, two photopolymer resins were calibrated for further investigation as part of this research. This has been done using a masked stereolithography (MSLA) printer, cleaning steps followed by curing. The resins were one biocompatible and the other with special flexibility. The evaluation of the printing was carried out using a validation matrix for SLA printing processes. The time required for the process steps had been observed as well. Both resins were calibrated with respect to their exposure time and the process chain was evaluated. The results are meaningful, but additional factors had been identified that need to be considered too.
Investigation on adhesion strength of Parylene-C coatings with different adhesion promotion methods
(2021)
Delamination of encapsulation materials (here the polymer Parylene-C) is one of the biggest failure mechanisms for active medical implants. This problem is addressed by the application of different pre-treatment and adhesion promotion methods. The methods applied in this research are oxygen and Silane A-174 solution pre-treatment and Silane A-174, titanium oxide and Trimethylsilane as adhesion promoters. The adhesion forces of these methods are quantified after different soaking times in phosphate buffered saline (PBS) solution to mimic environment of the human body.