Saloua Saghir skal forsvare avhandlingen sin for graden philosophiae doctor (ph.d.) ved Universitetet i Sørøst-Norge.
Hun har fulgt doktorgradsprogrammet i teknologi ved fakultet for teknologi, naturvitenskap og maritime fag, institutt for mikrosystemer.
Alle interesserte er velkomne til å følge prøveforelsningen og disputasen.
- Lenke til avhandlingen kommer her
Sammendrag
Neuroelectronic interfaces have considerable potential in medicine, but their long-term clinical use is limited by mechanical, electrical, and biological mismatches between the devices and neural tissue. This thesis addresses all three challenges through a microfabrication platform built on three complementary components.
The first building block focuses on microfabricating flexible polyimide-based devices. Using polymer substrates and semiconductor lithography, devices with thicknesses down to 4.5 µm were successfully fabricated, establishing a framework that balances performance and process reproducibility.
The second building block tackles the electrical mismatch using dual electronic-ionic conducting polymer coating. PEDOT:Polydopamine electrodeposited onto gold electrodes provided a ~ 9-fold increase in electroactive surface area, a ~2-fold reduction in impedance at 1 kHz, and a ~470-fold reduction at 1 Hz. Additionally, a hyaluronic acid-grafted composite (PEDOT:DAHA) proved that the dopamine backbone can serve as a chemical scaffold for biomolecule conjugation.
The third building block addresses inflammatory protein adsorption by integrating a photopatternable glycidyl methacrylate hyaluronic acid hydrogel as an encapsulation layer. Mimicking the extracellular matrix, this hydrogel promotes a progenitor-like cellular phenotype in surrounding cells, which can support tissue repair, improve implant integration, and reduce the risk of fibrotic encapsulation.
Taken together, these three building blocks demonstrate that the mechanical, electrical, and biological gaps between implanted electronics and neural tissue can be successfully bridged within a single platform.