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Fabrication and Properties of Siloxane Polymer for Stretchable Electrode Substrate
신은애,정제영,이창기 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Recently, with the development of Internet of Things (IoT) technology, interest in wearable devices is increasing. Flexible electronics undergo mechanical deformation in a variety of shapes and sizes. The substrate must be flexible and stretchable to prevent damage from these deformations. So far, soft materials such as silicone rubber and acrylic rubber have been mainly used as substrates for flexible devices. In this study, we introduce a stretchable substrate based on PDMS (Polydimethylsiloxane). It is manufactured by adding a material containing a vinyl group to control the crosslinking density. Various samples were prepared by controlling the amount of vinyl-based material added, and elasticity was measured.
Non-stick Ceramic Coating for Pottery by Incorporation of Cellulose Nanofibers
신은애,김계현,이창기 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Ceramic coating is not only eco-friendly and harmless but also thermally and chemically durable. However, foods easily adhere to the cookware on cooking due to hydrophilic coating layer from numerous hydroxyl groups on silica surface. To solve such problem, we prepared ceramic coating solution with enhanced non-stick property. This hydrophobic coating was materialized by rough surface from nanofibers added into ceramic solution. Cellulose nanofibers (CNFs) contained in silica colloidal solution for ceramic coating made the surface of coating irregularly and rough. The average roughness of ceramic coating surface increased when CNFs were added according to the results from 3D microscope. Also, ceramic coating incorporated CNFs was more thermally stable so its thermal degradation temperature also increased compared to that of base ceramic solution. We anticipate that the non-stick and thermally stable pottery can be fabricated by applying this CNF-incorporated ceramic coating.
Cellulose-assisted Dispersion of Carbon Nanotubes
신은애,김계현,정제영,이상봉,이창기 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Carbon nanotube (CNTs) have attracted much attention because of their high electrical conductivity and light weightness. In this study, we introduce the method to disperse CNTs using cellulose nanofibers (CNFs). CNTs were dispersed with only CNFs in aqueous solution without any other surfactant. CNT/CNF solution can be printed onto substrate and it shows a resistivity of less than 10 mohm.cm. We analyze the structure and morphology of CNT/CNF solution and printing. Also, this CNT-based ink is printable on various substrate such as film and paper. We expect this CNT/CNF solution be used as a material for flexible label.