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Highly Stretchable, Transparent Ionic Touch Panel
Jeong-Yun Sun(선정윤),Chong-Chan Kim,Hyunhee Lee,Kyu Hwan Oh 한국표면공학회 2017 한국표면공학회 학술발표회 초록집 Vol.2017 No.5
The touch panel was developed decades ago and has become a popular input device in daily life. Because human-computer interaction is becoming more important, the next generation of touch panels require stretchability and bio-compatibility to allow integration with the human body. However, because most touch panels were developed based on stiff, brittle electrodes, electronic touch panels face difficulties to achieve such requirements. In this paper, for the first time, we demonstrate an ionic touch panel based on polyacrylamide hydrogel containing LiCl ions. The panel is soft and stretchable and thus, can sustain a large deformation. The panel can freely transmit light information through it because the hydrogel is transparent, with 99 % transmittance for visible light. A 1-dimensional touch strip was investigated to reveal the basic mechanism of sensing, and a 2-dimensional touch panel was developed to demonstrate its functionalities. The ionic touch panel was operated under high deformation with more than 1000% areal strain without sacrificing its functionalities. Furthermore, an epidermal touch panel on the skin was developed to demonstrate the mechanical and optical invisibility of the ionic touch panel through writing words, playing the piano and playing games.
Biomimetic Approaches with Stretchable Ionics
Jeong-Yun Sun(선정윤) 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Elasmobranch fishes, such as sharks, skates and rays, use a network of electroreceptors distributed on their skin to locate nearby prey. The receptors can detect the electric field generated by the biomechanical activity of their prey. By comparing the intensity of the electric fields sensed by each receptor in the network, the animals can estimate the relative positions of nearby prey without making physical contact. Inspired by this capacity for prey localization, we developed a soft artificial electroreceptor that can detect the relative positions of nearby objects in a non-contact manner by sensing the electric fields that originate from the objects. By wearing the artificial receptor, a person can receive spatial information of a nearby object in real time via auditory signals. The soft artificial electroreceptor is expected to expand the ways in which a person can perceive space by providing a new sensory modality that did not evolve naturally in human beings.
폴리머 구조 복합체 평가를 통한 소재 보호필름 구조 검토
박준근(Jun-geun Park),선정윤(Jeong-yun Sun) 대한전자공학회 2020 대한전자공학회 학술대회 Vol.2020 No.8
Innovative foldable displays have been reported to experience failures derived from mechanical defects by external force, since the consisting polymer films of foldable displays contain low level mechanical property. To reduce the mechanical failure, this paper suggests new structure composite of polymer protect films to protect material by attaching object. We evaluated each mechanical property of polymer film through tensile test and stress relaxation test. Furthermore, we constructed the structure composites and confirmed the mechanical property of structures composite by using the finite element analysis.
유연전자회로를 위한 폴리머 기판/세라믹 아일랜드를 사용한 획기적 유연성 확보기술
윤주일(Juil Yoon),선정윤(Jeong-Yun Sun),오규환(Kyu-Hwan Oh),Joost J.Vlaask,Zhigang Suo 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
For a flexible electronic device integrating inorganic materials on a polymer substrate, the polymer can deform substantially, but the inorganic materials usually fracture at small strains. In this work, we show a novel approach to make such a device highly stretchable. A polyimide substrate is first coated with a thin layer of an elastomer, on top of which SiNx islands are fabricated. When the substrate is stretched to a large strain, the SiNx islands remain intact. Our simple model illustrates that the very small stiffness of the interlayer is the key to significantly reduce strains in the islands and therefore the stretchability of polymersupported ceramic island arrays has been improved remarkably.
손경민(Kyungmin Son),선정윤(Jeong-Yun Sun),김호영(Ho-Young Kim) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Flexible shape change of an object in a controlled matter has begun to be exploited in robotics, electronics, and architectures thanks to recent advances in smart and soft materials. Although new materials allow us to envision a system that challenges the physical limitations of traditional mechanical systems, the large deformations are still limited only in a preprogrammed mode. In this study, we introduce a mechanical morphing system, a morphable liquid interface coated with dielectric particles, which can reversibly and rapidly change its shape under an electric field. The field transforms the so-called ‘particle rafts’ into a mound and a tower within seconds and causes them to move horizontally. We experimentally and theoretically show that the raft morphing is controlled by electrostatic attraction and electric discharge between electrodes and particles. This presents a highly deformable and electrically controllable mechanical system that can be applied to soft robotics and smart architecture.