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Busan, South Korea

Lee H.D.,CFC Teramate Co. | Kim J.M.,CFC Teramate Co. | Son D.H.,CFC Teramate Co. | Lee S.-H.,Korea Institute of Ceramic Engineering And Technology | Park S.S.,Pukyong National University
Applied Chemistry for Engineering | Year: 2013

In this study, zinc oxide (ZnO) nano powder, well known as an UV absorbing material, was synthesized with three synthetic conditions by the hydrothermal method. After ZnO nano powder was surface-modified with various silane coupling agents to improve dispersion property, a dispersion sol was prepared with dispersant for 72 h by the ball-milling of surface-modified ZnO nano powder. The dispersion sol, prepared by modifying the surface of the ZnO nano powder with an average size of about 30 nm using 3-chloropropyl trimethoxy silane, showed an excellent dispersion stability with a high UV-shielding and visible trnasparency. Source


Son D.H.,CFC Teramate Co. | Lee Y.-Y.,Ukseung Chemical Co. | Kim S.J.,Pukyong National University | Hong S.-S.,Pukyong National University | And 2 more authors.
Journal of the Korean Industrial and Engineering Chemistry | Year: 2011

Organic-inorganic hybrid coating solutions were prepared by using a sol-gel method for transparent film. In this study, colloidal silica (CS) and alkoxy silane such as vinyltrimethoxysilane (VTMS), and [3-(methacryloyloxy)]propyltri methoxy silane (MAPTMS) were used in various conditions such as types of organic silane, weight ratios of CS to silane and reaction times. Coating solutions which were bar coated on the PET (polyethyleneterephthalate) film and cured were investigated on the chemical and physical properties. The pencil hardness and adhesion of coating films were increased with increasing the organic silane content in the coating solution compared to that of PMMA (polymethamethylcrylate) coating solution. Source


Son D.H.,Pukyong National University | Kim D.-S.,CFC Teramate Co. | Lee S.-H.,Korea Institute of Ceramic Engineering And Technology | Kim S.H.,Korea Institute of Ceramic Engineering And Technology | And 2 more authors.
Applied Chemistry for Engineering | Year: 2012

In order to improve the surface hardness of transparent plastic films, an organic-inorganic hybrid coating solution was sunthesized by the sol-gel method. Coating solutions that were prepared colloidal silica (CS), poly methyl methacrylate (PMMA), vinyltrimethoxysilane (VTMS), and [3-(methacryloyloxy)]propyltrimethoxy silane (MAPTMS) was varied with synthesizing parameters such as kinds of organic silane and weight ratio of CS to PMMA. Such coating solution was bar coated on the PET film, cured, and investigated on the chemical and physical properties of coating film. The organic-inorganic hybrid coating solutions have better properties at the pencil hardness and adhesion of coating film than those of an organic material such as PMMA. Source


An B.R.,Pukyong National University | Lee G.-D.,Pukyong National University | Son D.H.,CFC Teramate Co. | Lee S.H.,Korea Institute of Ceramic Engineering And Technology | Park S.S.,Pukyong National University
Applied Chemistry for Engineering | Year: 2013

Vanadium oxide (VO2) and tungsten-doped vanadium oxide (W-VO2) powder, well known as thermochromic materials, were prepared from vanadium pentoxide (V2O5) and oxalic acid dihydrate by hydrothermal and calcination process. The crystal structure and thermochromic property of samples were analyzed using FE-SEM, XRD, XPS, DSC, and UV-Vis-NIR spectroscopy. With increasing the doping amount of W, the phase transition temperature of W-VO2 sample decreased from 70 °C to 42 °C. When heating W-VO2 sample above the phase transition temperature, the UV-Vis-NIR spectrum was not changed in the visible range and shifted towards a low transparency in the full name (NIR) region. Source


Lee Y.-Y.,Pukyong National University | Son D.H.,CFC Teramate Co. | Lee S.-H.,Korea Institute of Ceramic Engineering And Technology | Lee G.-D.,Pukyong National University | And 2 more authors.
Applied Chemistry for Engineering | Year: 2010

Highly anti-reflective optical property has been focussed in the field of thin film and display because of increasing demands to the high transparency and clearness of optical component. In this study, to obtain anti-reflective property, the formation of aluminium oxide with nanoscaled flowerlike frame structure was introduced as oxide material monolayer on the substrate by hydrothermal synthesis through sol-gel method. The properties of coating layer were measured by the means of UV-Vis spectroscopy, FT-IR spectroscopy, XRD, and FE-SEM. The morphology of coating layer in alumina-sol coated samples was controlled by hydrothermal temperature and time with aid of ultrasound. It was found that high transparency and anti-reflective optical properties were obtained the formation of flowerlike nanoframe structure. Source

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