vacancy phd position in lasertechnology
A PhD position is available in a project on High-resolution deposition of high viscosity materials using Laser Induced Forward Transfer (Hi-LIFT) using (ultra)short pulsed laser sources.
3D printing is becoming a mainstream manufacturing technology. Highly accurate, fast and large area deposition processes for functional materials such as metals, transparent conductors, insulators and semiconductors in a patterned manner are in high demand. Traditional approaches such as vacuum deposition, inkjet and screen printing technologies all have their own merits, however also have specific drawbacks in terms of processing conditions, maximum resolution, achievable layer thickness, materials performance and processing speed. Exposure of a (highly) viscous metal ink to intense, short light pulses generated from a focused laser spot has been introduced as promising alternative printing technology. Exposure of a wet film to an intense laser pulse is used to selectively ablate a section of the coating at the exposed area, and propel the material from the film to a receiver substrate by the thermal stresses induced by the same laser pulse. In this manner, metals, polymers, liquids, and pastes have already been printed. However, for pastes and “complex” liquids, for which the viscosity depends on the shear rate, undesired deposition of multiple droplets, off-angle ejection, and splashing are commonly observed. These phenomena are usually detrimental for the printed structure, and it is not fully understood how process parameters influence the LIFT process. Therefore, in this project, we aim to develop a deeper understanding of LIFT by combining experimental investigations of the transfer process with advanced modeling. We aim to design controlled material/process combinations for successful printing of new materials and to demonstrate printing of conductive circuits in 3D.
The PhD candidate will jointly address these challenges, as part of a team, including senior & junior researchers from the Physics of Fluids group, the Chair of Applied Laser Technology at the University of Twente and the Holst Centre in Eindhoven. He or she will be hosted by the Applied Laser Technology group and will be stationed at the Holst Centre.
The project is funded by the Dutch Technology Foundation, grant no. 800533.
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