Electrowriting of SU-8 Microfibers

© 2024 EPFL

© 2024 EPFL

Congratulations to our colleagues Dr. Arnaud Bertsch, Dr. Sébastien Jiguet and Prof Jürgen Brugger, for their recent collaborative publication entitled "Electrowriting of SU-8 Microfibers" in the journal "Polymers".

As microfiber-based additive manufacturing (AM) technologies, melt electrowriting (MEW) and solution electrowriting (SEW) have demonstrated efficacy with more biomedically relevant materials. By processing SU-8 resin using MEW and SEW techniques, a material with substantially different mechanical, thermal, and optical properties than that typically processed is introduced. SU-8 polymer is temperature sensitive and requires the devising of a specific heating protocol to be properly processed. Smooth-surfaced microfibers resulted from MEW of SU8 for a short period (from 30 to 90 min), which provides the greatest control and, thus, reproducibility of the printed microfibers. This investigation explores various parameters influencing the electrowriting process, printing conditions, and post-processing to optimize the fabrication of intricate 3D structures. This work demonstrates the controlled generation of straight filaments and complex multi layered architectures, which were characterized by brightfield, darkfield, and scanning electron microscopy (SEM). This research opens new avenues for the design and development of 3D-printed photonic systems by leveraging the properties of SU-8 after both MEW and SEW processing.

For more details, please visit: https://www.mdpi.com/2073-4360/16/12/1630


The MidSize Equipment funding initiative was received from the Institute of Electrical and MicroEngineering at EPFL for the material to build the custom-made MEW.