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Robot Gripper Skin with Shape-Adaptive and Reversible Magnetorheological Elastomer
오승주,배진우,한동헌,윤재욱,우인선 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Developing a simple and common solution for gripping breakable, multiscaled, and random-shaped objects using a robot gripper is challenging. We developed a universal, shape-adaptive/-holding and reversible, hardness-variable magnetorheological elastomer (MRE) for gripper skin that served as a creative solution for grasping such objects without damaging them. The MRE gripper skin was attached to a robot gripper. The magnetorheological elastomer took the shape of a target object whenever the gripper grasped the object. At this time, we applied a magnetic field for solidifying the magnetorheological elastomer, thereby allowing the gripper to grasp the target object easily. After releasing the objects, the magnetic field is removed and the deformed gripper skin immediately restored its original shape. The developed MRE skin was prepared to grasp various target objects, such as cylinders, cuboids, and triangular prisms, and based on which its grasping performance was evaluated.
Neuron-encapsulating microgel cross-linked with synthetic and natural hybrid polymers
오승주,김희진,조성우,정재현 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
The encapsulation of live cells in calcium cross-linked alginate gel has been extensively studied. However, biological use of alginate gel has been limited by the low structural integrity of the gels for a long-term cell culture condition. Therefore, in this study, we demonstrated that the incorporation of sequential covalent cross-links in an ionically cross-linked alginate gel using synthetic and natural hybrid polymers. This strategy enhanced the structural integrity and further regulated the growth and differentiation of neuron cells encapsulated in the gels. Overall, the results of this study will be highly useful in designing encapsulation devices with tuned structural integrity for regulating various functions of live cells.
Nanocrystal based electronic devices and sensors
오승주 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Nanocrystals have been shown to be promising materials for various device applications because of their size-dependent electronic and optical properties and solution processability. We present general methods to engineer the electronic, optoelectronic, electromechanical, and electrothermal properties of nanocrystals through ligand engineering. Unconventional material designs and strategies are introduced to fabricate semiconducting devices and wearable sensors. This technique provides a pathway for designing low cost, high performance, and multifunctional devices and sensors.
Tuning the toughness of an Alginate microgel for cell-instructed Delivery
오승주,김희진,조성우,한사라,신성규,정재현 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
The encapsulation of live cells in calcium cross-linked alginate gel has been extensively studied. However, biological use of alginate gel has been limited by the low structural integrity of the gels for a long-term cell culture condition. Therefore, in this study, we demonstrated that the incorporation of sequential covalent cross-links in an ionically cross-linked alginate gel using synthetic and natural hybrid polymers. This strategy tuned the toughness of an encapsulated alginate microball and further regulated the targeted cell delivery in terms of growth and differentiation of neuron cells encapsulated in the gels. The balls were opened by the force that the cells pull the gel fiber by the differentiation of the cells and the micro-balls can deliver the live neuron cells. Overall, the results of this study will be highly useful in designing encapsulation devices with tuned structural integrity for regulating various functions of live cells.