In this paper, we present the relationship between printing parameters of a 3D gel printer "Soft and Wet Intelligent Matter-Easy Realizer (SWIM-ER)" and mechanical properties of the fabricated gel objects by SWIM-ER. The printer is able to fabricate hydrogel objects by scanning of ultra-violet (UV) light irradiation (photopolymerization). Various hydrogels objects were printed with different scanning velocity of UV light. We measured the water content and mesh sizes of gel objects utilizing Scanning Microscopic Light Scattering (SMILS). Furthermore, we also printed the gel objects with multiple scan rates with constant UV light irradiation energy, and measured sizes of gel objects, and performed the compression test. It was observed that the physical properties of printed hydrogel objects are strongly related with 3D printing parameters (scan velocity and number of scans-scan rate) due to difference in crosslinking density of polymer network.
The reliability of top-gate oxide thin-film-transistors on a polyimide substrate correlates with the volume resistivity of the polyimide substrate. Hence, the polyimide used as a TFT substrate should have a high resistivity of 3×10 17 ohm-cm or more to ensure high TFT reliability equal to the TFT on a glass substrate.
We have developed a 13.3-in. 200-dpi flexible electrophoretic display driven by printed-organic TFTs (OTFTs). To manufacture the OTFT backplane, a polymer resist and a fluorous polymer were printed using a high-resolution offset printing system that we have developed for Gen-1 substrates to achieve 5-μm resolution and ±2.2-μm overlay accuracy.
We have developed a low contact pressure Residual ink Removed Pattern Transfer (R2PAT) printing method which allows fully additive, vacuum‐free TFT electrode fabrication. A 900nm resolution and ±1um alignment accuracy has been achieved. A TFT fabricated using this method had demonstrated 33.9 cm2/Vs mobility and a 108 Ion/Ioff ratio.
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