In-gel electrohydrodynamic direct-writing for 3D nonwoven fiber prototyping
This advanced prototyping technology uses in-gel electrohydrodynamic direct-writing to create precise 3D nonwoven fiber structures, offering programmability and fine control over fiber placement. The process utilizes an electric field to draw polymer jets into micron fibers, solidifying them in a viscous bath that is later etched away, leaving a nonwoven structure with designed porosity.
Overview
In-gel electrohydrodynamic direct-writing (IG-EHD) is a cutting-edge technology that enables the prototyping of true 3D nonwoven fiber structures with precise control over fiber placement and morphology. This process leverages an electric field to draw polymer jets into micron-scale fibers, which are then solidified in place within a viscous bath. The fibers are photopolymerized at junctions during the writing process, ensuring structural integrity. After writing, the bath is etched away, leaving a nonwoven structure with designed morphology and pore placement, verified by micro-CT scanning.
Technical specifications
- Process: Uses an electric field to form sub-30 µm fibers
- Precision: Programmable 3D placement with in-situ photo-curing
- Materials: Utilizes PCL fibers and a dielectric bath
- Verification: Micro-CT used for model verification
- Scalability: Phased approach to scale from small coupons to cm-scale sheets
- Innovative: Combines electrospinning's fine fibers with 3D printing's precision
Technology readiness level
This technology is currently at Technology Readiness Level 3, having demonstrated proof of concept through the fabrication of a prototype coupon. Future phases will focus on scaling and refining the process to accommodate complex trajectories and larger sheets, with ongoing validation against set pore-volume metrics.
About Northwestern University
Northwestern University is a comprehensive private research university with campuses in Evanston and downtown Chicago and a collaborative, cross‑disciplinary culture. Integration with a major hospital system enables clinical research, diverse patient access, and rapid translation from bench to bedside. Shared research cores, prototyping facilities, a campus incubator, and dedicated corporate engagement teams make it straightforward to scope projects, structure agreements, and place talent. Research is supported by competitive federal funding from agencies such as NIH, NSF, DOE, and DoD, complemented by foundation and industry partnerships. A dedicated technology transfer office advances IP strategy, licensing, and startup formation.
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