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Tactile sensing electronic skin for wearable and robotic applications
스티브박 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Electronic skin are devices are mimic the tactile sensing properties of human skin. They have a variety of exciting applications such as 3D touch screens, wearable electronics for health monitoring, prosthetics, and robotics with human-like functionalities. Herein, we propose the use of microporous structures to fabricate highly sensitive, large dynamic range pressure sensors with low hysteresis, and strain sensors with no response to applied pressure. Together these devices can be used to differentiate between various tactile inputs and high degree of accruacy. Our sensors can be coated onto three dimensional surfaces or be attached to human joints to detect human motion.
Fabrication of Textile-Based Tactile Sensors that can be used on Both Sides
박규순,스티브박 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Tactile sensors are a necessary technology in various fields such as robots and prosthetics. However, most tactile sensors are made of inorganic materials, making them difficult for mass production and customization. In addition, tactile sensors developed so far have been difficult to integrate using only one side of the substrate. In this study, we developed a 3D printing technology and a solution-based tactile sensor production technology to produce a strain sensor, pressure sensor, and an electrode. Furthermore, the advantages of textile and solution-based tactile sensors, which are attracting attention as next-generation substrates applicable in soft robot systems and soft exosuits, are combined to make it possible to utilize both sides. Through viscosity, we found conditions for free utilization of both sides in several fibers. Through this study, it is expected that the integration of tactile sensors on textile substrates will lead to significant development.
Particle-Assembled Liquid Metal Film via Solution Shearing for Soft Electronics
김현지,스티브박,정재웅 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Liquid metal (LM) is considered the most suitable material for soft electronics due to its high conductivity, superior deformation and elasticity comparable to metal. However, it was difficult to create a film with chemical and mechanical stability, and the actual application was limited because traditional cleanroom-based processes could not form multilayer (from microns to mm) and multilayer patterns. This study suggests how to create a particle-assembled LM film uniformly over a large area through a solution shearing of LM particulate ink with polymer electrolytes attached. Ink has been formulated to significantly stabilize the LM particles in the solution and to help self-assembling with thin films during the solution shear. In particular, the photolithography lift-off process allows patterning of wafer scale, multilayer, and high-resolution features (~10 μm) of varying thicknesses, providing a wide variety of processes for manufacturing different soft electronics.
이태훈,스티브박 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Amongst the c-MOFs, Ni₃(hexaiminotriphenylene)2 (Ni₃(HITP)₂) is especially promising due to its high conductivity on the order of 4-5,000 S/m. We demonstrate a combination of the Microfluidic-based Solution shearing process and the Post-synthesis process (MSP) that enables the large-area synthesis of ultrathin, flexible, and conductive Ni₃(HITP)₂ films across micrometer-scale areas through precisely controlled steps. The continuous microfluidic flow in the microfluidic channel precisely mixes the precursors to supply a solution of uniform concentration during the solution shearing process. The homogeneous Ni₃(HITP)₂ precursor obtained from the solution shearing process forms the Ni₃(HITP)₂ thin-film after the amine post-treatment process. The resulting high qualities of the Ni₃(HITP)₂ thin-film facilitate its application in high-performance electronic devices.
오병국,김진오,스티브박 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
There has been a great deal of interest in minimizing the mechanical mismatches between soft tissue and soft electronics for reducing invasiveness. However, conventional soft electronics are made of polymers with high Young’s modulus like polyimide and Polydimethylsiloxane (PDMS). To minimize invasiveness, hydrogels have widely been used. Although few research groups have developed the hydrogel-based soft electronics, those still have challenges for long-term reliabilities due to swelling and drying properties of hydrogels. Herein, we report an unconventional approach for coating hydrophobic monomers to various hydrogels at room temperature with rapid coating method. The anti-swelling and -drying coating can be complete within 10 min. Hydrogels coated with hydrophobic monomers can maintain their original shape more than 7 day. The coating method we develop can be used to various hydrogels which have low melting point such as gelatin, agarose-based hydrogel.
Real-time sitting posture monitoring system based on random forest using pressure sensor array
Eui-Jin Koo(구의진),Seung-Hyeon Lee(이승현),Da-Young Go(고다영),Gi-Na Yoon(윤지나),Min-Seon Lee(이민선),Ah-Young Jung(정아영),Han-Hee Lee(이한희),Jun-Chang Yang(양준창),Steve Park(스티브박),Young-Jin Na(나영진),Soo-Young Kim(김수영),W 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.4