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Shin H.G.,Jeonju University | Oh J.H.,Korea Institute of Carbon Convergence Technology | Byun D.H.,Korea Polytechnic University | Choi H.C.,Jeounbuk Human Resources Development Institute
Key Engineering Materials | Year: 2017

It is safe and light because it uses carbon/glass fiber reinforced plastics (hereinafter referred to as C/GFRP) through this technological development. Moreover, sunlight LED luminous bollard, which was harmonized with the surrounding environment with diverse colors, was developed. Luminous bollard can reduce its weight and also increase its strength by adjusting the intensity and thickness of a product customized for each usage on the basis of the characteristics of C/GFRP composite. In addition, C/GFRP and steel pipe were compared for the compression test in order to compare the objective rigidity. As a result, this study could obtain a positive result graph of luminous bollard. To develop luminous bollard, the composite development process was configured through a fixture of pullout and filament winding. Diverse colors can be applied to luminous bollard. Hence, it is possible to select a color customized for each region. It is also possible to create an aesthetic harmony with a surrounding environment through LED lamps at night. The pipe, which was 50 percent lighter than stainless and also which had excellent tensile strength, was designed to develop the bollard that has superior convenience in terms of construction, maintenance and repair. © 2017 Trans Tech Publications.


Lee H.-M.,Korea Institute of Carbon Convergence Technology | Lee H.-M.,Inha University | Kwac L.-K.,Jeonju University | An K.-H.,Korea Institute of Carbon Convergence Technology | And 2 more authors.
Energy Conversion and Management | Year: 2016

In the present study, electrode materials for electrochemical capacitors were developed using pitch-based activated carbon fibers with steam activation. The surface and structural characteristics of activated carbon fibers were observed using scanning electron microscopy and X-ray diffraction, respectively. Pore characteristics were investigated using N2/77 K adsorption isotherms. The activated carbon fibers were applied as electrodes for electrical double-layer capacitors and analyzed in relation to the activation time. The specific surface area and total pore volume of the activated carbon fibers were determined to be 1520–3230 m2/g and 0.61–1.87 cm3/g, respectively. In addition, when the electrochemical characteristics were analyzed, the specific capacitance was confirmed to have increased from 1.1 F/g to 22.5 F/g. From these results, it is clear that the pore characteristics of pitch-based activated carbon fibers changed considerably in relation to steam activation and charge/discharge cycle; therefore, it was possible to improve the electrochemical characteristics of the activated carbon fibers. © 2016 Elsevier Ltd


Park S.-J.,Inha University | Seo M.-K.,Korea Institute of Carbon Convergence Technology
Springer Series in Materials Science | Year: 2015

Currently, the use of carbon fibers and their composites in space and aerospace applications continues to grow. However, the vast majority of composite molding is used in automotive, marine, industrial, and recreational applications. In this chapter, a brief explanation of various processing methods will be provided and the manufacturing processes typically used to make products found in various applications will be covered. Further, it is classified into two types—open molding and closed molding process—which will be described. © Springer Science+Business Media Dordrecht 2015.


Park S.-J.,Inha University | Kim B.-J.,Korea Institute of Carbon Convergence Technology
Springer Series in Materials Science | Year: 2015

Traditionally, the application of carbon fibers has been limited to very special fields such as aerospace and military because of their high cost. However, various techniques for low-cost carbon fibers are under development in terms of using low-cost precursors, low-cost manufacturing processes, and even functional coating methods. Moreover, future applications of carbon fibers can widen not only as structural reinforcements but also in information technology-based applications such as housings for electric devices, smart cloths, and healthcare items. In this chapter, we will cover the carbon fibers and their composites in recent various applications. In particular, there are classified as a low-cost production technique of carbon fibers for general industries, thin carbon fibers for extreme industries, and functional carbon fibers for smart composites. © Springer Science+Business Media Dordrecht 2015.


Lee H.-M.,Korea Institute of Carbon Convergence Technology | Kim H.-G.,Jeonju University | Kang S.-J.,Korea Institute of Carbon Convergence Technology | Kang S.-J.,Jeonju University | And 3 more authors.
Journal of Industrial and Engineering Chemistry | Year: 2015

In this study, activated carbon nanofibers (ACNFs) were prepared for supercapacitor electrode applications by using nanosize polyacrylonitrile (PAN) fibers as a precursor, following treatments under various activation conditions. The surface morphologies and structural characteristics of the ACNF were observed by scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. The N2 adsorption isotherm characteristics at 77K were confirmed by Brunauer-Emmett-Teller (BET) and Dubinin-Radushkevich (DR) equations. The mesopore size distributions of the samples were obtained by Barrett-Joyner-Halenda (BJH) equation. The ACNFs were applied as an electrode for electrical double-layer capacitors and analyzed in relation to the activation conditions. SEM analysis confirmed that many pores or excessively-oxidized structures were found on the fiber surfaces after KOH activation. The specific surface areas and specific capacitance of the prepared ACNFs were enhanced with increasing activation time. © 2014 The Korean Society of Industrial and Engineering Chemistry.


Kim B.-J.,Korea Institute of Carbon Convergence Technology | Bae K.-M.,Inha University | Lee Y.S.,Cheil Industries Inc. | An K.-H.,Korea Institute of Carbon Convergence Technology | Park S.-J.,Inha University
Surface and Coatings Technology | Year: 2014

Multi-walled carbon nanotubes (MWCNTs) were nickel (Ni)-plated chemically to enhance the electrical performance, resulting in an increase in the electromagnetic interference (EMI) shielding efficiency (SE) of the Ni-MWCNTs-reinforced epoxy matrix nanocomposites. The micro-structural and morphological properties of the Ni-MWCNTs were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. The surface characteristics of the Ni-MWCNTs and the EMI SE of the Ni-MWCNTs/EP composites were examined by X-ray photoelectron spectroscopy (XPS) and a vector network analyzer, respectively. From these results, the addition of the MWCNTs in the EP matrix led to an increase in the EMI SE of the composites. The higher Ni content on the MWCNTs of the Ni-MWCNTs/EP composites showed a better EMI SE. This indicates that the presence of Ni on the MWCNTs can lead to a good EMI SE due to the EMI adsorption behavior of the metal particles. © 2014 Elsevier B.V.


Chava R.K.,Chonbuk National University | Oh S.-Y.,Chonbuk National University | Oh S.-Y.,Korea Institute of Carbon Convergence Technology | Yu Y.-T.,Chonbuk National University
CrystEngComm | Year: 2016

The interest in hybrid nanoparticles (NPs) arises from their combined and often synergetic properties exceeding the functionality of the individual components. Herein, a general, environmentally friendly, and facile hydrothermal approach to synthesizing the metal-semiconductor, Au@In2O3 core-shell heteronanostructures, is described. These Au@In2O3 core-shell NPs are used as chemiresistive gas sensors for the detection of hydrogen gas in air. The sensor device based on Au@In2O3 core-shell NPs showed ∼4 times greater response and is also more selective to H2 gas compared to the In2O3 NPs sensor device. The enhanced activity can be attributed to the catalytic effect of Au, and synergistic interactions between the Au and In2O3 NPs formed in the core-shell heteronanostructures in such a way that favors the efficient electron transfer at the interface. The hydrogen sensing behavior is dependent on the redox reaction between the H2 and chemisorbed oxygen species. © The Royal Society of Chemistry 2016.


Lee H.,Chonbuk National University | Yang S.,Chonbuk National University | Lee J.-H.,Chonbuk National University | Soo Park Y.,Chonbuk National University | Soo Park Y.,Korea Institute of Carbon Convergence Technology
Applied Physics Letters | Year: 2014

We examined the electrooptical properties of a nematic liquid crystal (LC) sample whose substrates were coated with a mixture of carbon nanotube (CNT) and polyimide (PI). The relaxation time of the sample coated with 1.5 wt. % CNT mixture was about 35% reduced compared to the pure polyimide sample. The elastic constant and the order parameter of the CNT-mixture sample were increased and the fast relaxation of LC could be approximated to the mean-field theory. We found the CNT-mixed polyimide formed more smooth surface than the pure PI from atomic force microscopy images, indicating the increased order parameter is related to the smooth surface topology of the CNT-polyimide mixture. © 2014 AIP Publishing LLC.


Ku M.Y.,Chonbuk National University | Shin H.C.,Korea Institute of Carbon Convergence Technology | Lee G.W.,Chonbuk National University
Transactions of the Korean Society of Mechanical Engineers, B | Year: 2016

In this study we investigated the effects of symmetrically arranged heat sources on the heat release performances of extruded-type heat sinks through experiments and thermal fluid simulations. Also, based on the results we suggested a high-efficiency and cost-effective heat sink for a solar inverter cooling system. In this parametric study, the temperatures between heaters on the base plate and the heat release rates were investigated with respect to the arrangements of heat sources and amounts of heat input. Based on the results we believe that the use of both sides of the heat sink is the preferred method for releasing the heat from the heat source to the ambient environment rather than the use of a single side of the heat sink. Also from the results, it is believed that the symmetric arrangement of the heat sources is recommended to achieve a higher rate of heat transfer. From the results of the thermal fluid simulation, it was possible to confirm the qualitative agreement with the experimental results. Finally, quantitative comparison with respect to mass flow rates, heat inputs, and arrangements of the heat source was also performed. © 2016 The Korean Society of Mechanical Engineers.


PubMed | Korea Institute of Carbon Convergence Technology and Chonbuk National University
Type: | Journal: Scientific reports | Year: 2016

The design and development of an economic and highly active non-precious electrocatalyst for methanol electrooxidation is challenging due to expensiveness of the precursors as well as processes and non-ecofriendliness. In this study, a facile preparation of core-shell-like NiCo2O4 decorated MWCNTs based on a dry synthesis technique was proposed. The synthesized NiCo2O4/MWCNTs were characterized by infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and selected area energy dispersive spectrum. The bimetal oxide nanoparticles with an average size of 62nm were homogeneously distributed onto the surface of the MWCNTs to form a core-shell-like nanostructure. The NiCo2O4/MWCNTs exhibited excellent electrocatalytic activity for the oxidation of methanol in an alkaline solution. The NiCo2O4/MWCNTs exhibited remarkably higher current density of 327mA/cm(2) and a lower onset potential of 0.128V in 1.0M KOH with as high as 5.0M methanol. The impressive electrocatalytic activity of the NiCo2O4/MWCNTs is promising for development of direct methanol fuel cell based on non-Pt catalysts.

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