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SwRI: Seminar on Novel 3D Printing Materials and its Applications

September 20, 2019 @ 10:30 am - 11:30 am CDT

| Free

Engineered Polymer Interfaces For Flexible (Bio)electronics, 3D Printing, and Internet of Things
Dr. Walter Voit
Director of the Center for Engineering Innovation / Associate Professor – The University of Texas at Dallas
President and CEO – Adaptive3D, Dallas, Texas

TIME: Friday, September 20, 10:30 am-11:30 am

PLACE: Bldg. 263, 6220 Culebra Road, San Antonio, TX 78238-5166

SUBJECT: Materials, Biomedical, Computer Science, and 3D Printing Applications

SPEAKER: Dr. Walter Voit (https://profiles.utdallas.edu/walter.voit) is a University professor as well as a Dallas-based entrepreneur. Over 10 spin-off companies are based on the technologies developed in his lab. Dr. Volt is the founder of Adaptive3D, which commercialized its ToughPoint, ToughRubber and ToughNet families of specialty 3D printing resins which boast industry-leading thermomechanical properties with a focus on strain-tolerant polymers.

ABSTRACT: Polymer engineering, specifically tuning monomer chemistries, polymerization kinetics and thin film interfaces, seeks to address grand challenges in neuroscience, semiconductor processing and additive manufacturing. We demonstrate peripheral and cortical neural stimulators and recording devices using engineered low cure stress softening polymer substrates. Polymers can be implanted at moduli of more than 1 GPa and softened toward the modulus of tissue. Neural interfaces allow for delivery of a large amount of information transfer, but current microstimulators or microrecorders fail chronically or are poorly suited for interfacing with small biological structures, such as sensory peripheral nerves. We demonstrate the effects of self-coiling vagus nerve stimulators and self-wrapping cochlear implants. We demonstrate spinal stimulators that reduce inflammation and tissue response and behave in a manner similar to ball electrodes for use in understanding long-term muscle plasticity.

We demonstrate microfabrication of flexible substrates compatible with full photolithographic process with 2 micron feature size at temperatures up to 300°C. Substrates compatible with high mobility semiconductors such as indium-gallium zinc oxide are highlighted. Devices are thermally cycled through thermal transitions and compared to state-of-the-art flexible substrates including biaxially oriented poly(ethylene naphthalate), polydimethylsiloxane, polyimides and others.

We demonstrate methods to 3D print materials that are isotropic, namely deformation perpendicular to the print grain does not lead to poorer thermomechanical properties than deformation in the XY plane along the print grain. This is accomplished using thiol-click chemistries and recently developed stereolithography printing techniques with an eye toward mass manufacturing. Tough materials across modulus ranges (Shore A 0 to 95) are printed into complex shapes and compared to commercial 3D printed materials. We take advantage of partial polymerization of oxygen-tolerant resins that can subsequently chemically crosslink into successive layers leading to strong, tough strain-tolerant materials.

RSVP to Esther Stewart, 210-522-6886. **Open to UTSA and UT Health SA students.**

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September 20, 2019
10:30 am - 11:30 am


Southwest Research Institute
6220 Culebra Road,
San Antonio, TX 78238 United States
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