https://scholar.gist.ac.kr/handle/local/7954 Fri, 25 Sep 2026 22:40:30 GMT 2026-09-25T22:40:30Z https://scholar.gist.ac.kr/handle/local/33863 Title: 국부 저압화 플라즈마 장치의 개발 및 플라즈마를 이용한 접착 강도 향상 Author(s): Jihyeon Lim Abstract: Plasma-assisted surface modification is widely recognized as an effective method for improving adhesion strength. However, conventional plasma systems face critical limitations. Low-pressure plasma systems achieve significant adhesion improvements but require prolonged pumping times, sample-size restrictions, and vacuum chambers, whereas atmospheric-pressure systems enable faster processing but exhibit limited adhesion improvements. To overcome these constraints, a Localized Low-pressure Plasma Device (LLPD) is developed, which integrates the advantages of both systems—strong plasma treatment and rapid processing. Unlike traditional low-pressure plasma systems that require placing the sample inside a sealed chamber, the LLPD enables direct plasma generation on the material surface by attaching the device externally, offering a compact, mobile, and scalable treatment configuration. The design of LLPD features localized evacuation and stable low-pressure plasma generation, achieving efficient radical formation within seconds. The production of highly reactive atomic oxygen species was confirmed using optical analysis under these conditions, which play a crucial role in surface functionalization. The performance of the LLPD was validated through plasma treatment of carbon fiber reinforced thermoplastic polymer (CFRTP), where rapid and robust adhesion enhancement was achieved within 20 seconds—comparable to the strongest reported results for conventional low-pressure plasma systems but at a fraction of the processing time. The development of LLPD establishes a new pathway for high-throughput, on-site plasma surface treatment without the need for massive vacuum chambers. LLPD thus represents a highly versatile and industrially compatible plasma source, particularly suited for large-scale structures in the aerospace and automotive industries. Wed, 31 Dec 2025 15:00:00 GMT https://scholar.gist.ac.kr/handle/local/33863 2025-12-31T15:00:00Z https://scholar.gist.ac.kr/handle/local/33862 Title: 거대 열팽창 단결정 소재 기반 고내구성 초박막 바이모프 엑추에이터의 설계 및 제작 연구 Author(s): Jang Minwoo Wed, 31 Dec 2025 15:00:00 GMT https://scholar.gist.ac.kr/handle/local/33862 2025-12-31T15:00:00Z https://scholar.gist.ac.kr/handle/local/19897 Title: Window-film Type Semitransparent Organic Photovoltaics Based on Conducting Polymer Electrodes for Building-integrated Photovoltaics Author(s): Chelim Jang Abstract: Semitransparent organic photovoltaics (ST-OPVs) with polymeric transparent electrodes are in the spotlight as window film type solar cells due to their advantages such as flexibility, high electrical conductivity, transparency, and solution processability. Currently, encouraging progress has been achieved on the ST-OPVs that focus on individual parameters such as high power conversion efficiency (PCE) and average visible transmittance (AVT), however, the passive properties as window films are yet to be explored. Furthermore, conventional transparent electrodes based on a vacuum process are expensive and possess poor productivity. Herein, we demonstrate all-solution processed multifunctional ST-OPVs using PEDOT (poly(3,4-ethylene dioxythiophene)) as a top electrode doped with perfluorinated sulfonic acid. Importantly, the perfluorinated sulfonic acid-treated PEDOT electrode exhibits high visible transmittance and outstanding electrical properties and simultaneously showed high infrared reflectance. Consequently, we successfully achieved high light utilization efficiency and thermal insulating capability. Sat, 31 Dec 2022 15:00:00 GMT https://scholar.gist.ac.kr/handle/local/19897 2022-12-31T15:00:00Z https://scholar.gist.ac.kr/handle/local/33860 Title: Wet tissue adhesive self-gelling polymeric powder hydrogels for rapid hemostasis Author(s): Daun Seo Abstract: Acute hemorrhage frequently occurs during trauma or surgical procedures, and insufficient hemostatic control can lead to severe complications or mortality. Conventional hemostatic agents, such as fibrin glue and pre-formed hydrogels, often exhibit limited efficacy in wet and bleeding environments due to their loss of adhesion and difficulties in handling. To address these limitations, I developed a self-gelling polymeric powder hydrogel composed of dextran-aldehyde and gelatin to permit rapid hemostasis through strong wet-tissue adhesion. The powder undergoes rapid in situ gelation through Schiff base reactions between the aldehyde groups of dextran-aldehyde and the amino groups of gelatin, enabling strong wet tissue adhesion. The dex-ald/gelatin powder hydrogel exhibited robust tissue adhesion to various wet tissues, including skin (14.5 ± 2.2 kPa), epicardium (10.7 ± 3.1 kPa), and muscle (9.1 ± 3.6 kPa), and demonstrated superior sealing performance in a porcine intestine model compared to fibrin glue, achieving a high bursting pressure of 10.4 ± 1.3 kPa. Furthermore, in vitro hemolysis and blood clotting confirmed its excellent hemocompatibility and effective promotion of clot formation. These findings suggest the potential of this polymeric powder hydrogel as a next-generation hemostatic sealant for surgical and emergency applications. Wed, 31 Dec 2025 15:00:00 GMT https://scholar.gist.ac.kr/handle/local/33860 2025-12-31T15:00:00Z