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Nacre mimetic cellulose-based nanocomposites
우경배,장다슬,배은실,허재은,심봉섭 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Although nacre (mother of pearl) is composed of mostly brittle aragonite (CaCO3) nanoplatelets and little amount of biopolymers, it shows superior mechanical properties because of its hierarchical brick-andmortar structures from molecular to macro levels. In this research, we fabricated montmorillonite (MMT)-cellulose nanofiber (CNF) nanocomposites by a simple filtration process to mimic nacre structure for enhancing its mechanical performances. We compared the properties of MMT/ CNF composites by varying MMT/CNF ratio, which was characterized by a scanning electron microscope (SEM), an X-ray diffraction (XRD), and a Fourier transform infrared spectroscopy (FT-IR). The opacity of the composites was decreased compared to pure MMT films, and selfextinguish property was also observed. Furthermore, relatively high toughness and strength were obtained by measuring in a tensile tester. These results suggest that our MMT-CNF composites have a potential replacement of commercial polymers.
Fabrication of Electrical Conductive melanin Composites by Precipitated Drying Method
엄태식,우경배,심봉섭 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Natural melanins (NMs), biosynthesized with L-tyrosine or L-dopa in creatures such as cuttlefish, have electrical conductivity, biocompatibility, and other unique properties. Because of its spherical shape (diameter in 100 ~ 150 nm), the NMs are difficult to form percolative networks for the electrical device applications. In this research, we fabricated electrically conductive NM / poly(vinyl alcohol) (PVA) composites whose structures show tightly aggregated packing by electrostatically balanced drying method. The electrical conductivity of our composite was several times higher than the previously reported composites. From this result, the NMs will open a new road to build biocompatible functional devices such as in the applications of implantable electrodes and neural interface.
디지털 원단의 감성이미지 도출을 위한 데이터베이스 활용 방안 연구 -니트 원단을 중심으로-
안재상,윤혜준,우경배,윤지원 한국니트디자인학회 2021 패션과 니트 Vol.19 No.2
In recent fashion market, 3D virtual clothing systems are used to shorten the production process and reduce the production cost of clothing samples. For implementing of this technology, high quality of database are required. Basic information can be obtained when buying new fabric, but more fabric properties are needed to get high quality database. Extra experiment is needed for obtaining fabric properties for database, but it has low efficiency. In this research, 285 knit fabric database was constructed by Kawabata Evaluation System for Fabrics (KES-FB) and fabric drape equipment. For the purpose of utilization, knit fabrics were calssified according to sensory characteristics for 5 experts, and it was possible to select duplucates when calssifying. As a result of the classification, it was classified into 74 types of outer, 77 types of active, and 235 types of top. Drape property, stiffness, and fullness were categorized in 7 grade in each. By using Euclidean similarity, 3 similar knit fabrics that can extract drape property, stiffness, and fullness were derived from constructed database. For checking the accuracy of this method, drape property, stiffness, and fullness of real knit fabric and extracted fabric were compared by using grade. The result shows that high similarity between real fabrics and extracted fabrics regardless of fabric type except active usage. The relatively low similarity of active fabric is thought to be the influence of the different characteristics due to functional processing. So it is thought that more supplement experiment in active fabric case should be needed In this study, physical and emotional fabric data can be extracted in a simpler way through the database and it is expected that this research can contribute to the reproducibility of 3D modeling in the fashion field.
엄태식 ( Taesik Eom ),우경배 ( Kyungbae Woo ),심봉섭 ( Bong Sup Shim ) 한국공업화학회 2016 공업화학 Vol.27 No.2
사람의 머리카락, 눈, 피부 등에서 발견되는 멜라닌은 자연의 생물체에 존재하는 어두운 색소를 가르치는 통칭이다. 멜라닌은 자유 라디컬을 흡수해서 제거하는 특성을 가지고 있어, 해로운 UV 광선이 생체로 침투할 때, 세포 및 조직을 보호하는 역할을 한다. 또한, 전기적 전도성 및 이온 전도성을 가지고 있으며, 항산화성, 젖은 상태에서의 접착성, 금속이온 킬레이팅 등 다기능성으로 인해, 다양한 분야에서의 응용이 주목받고 있다. 자연계에 존재하는 생체 멜라닌의 구조를 정확하게 정의할 수는 없지만, 멜라닌의 응용 분야는 센서, 의료기기 등으로 확대되고 있다. 본 미니총설에서는 멜라닌의 원천과 합성, 구조와 특성, 그리고 다양한 분야로의 응용 가능성에 대해서 구체적으로 논의한다. Melanin is a common name used for a certain type of natural dark pigments existing in living organisms, particularly in human hair, eyes, and skin. The unique free radical scavenging effect of melanine could help protecting cells and tissues from harmful UV light. While their exact molecular structures in nature are not still well defined, their multifunctional properties including electrical and ionic conductivities, antioxidation, wet adhesion, and metal ion chelation, are highlighted for the potential applications in bioorganic electronics including biomedical sensors and devices. In this mini-review, we will discuss sources, synthesis methods, structures and multifunctional properties of melanin materials in addition to current research directions on a wide range of applications.