Korea Dyeing Technology Center

Daegu, South Korea

Korea Dyeing Technology Center

Daegu, South Korea
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Son Y.-S.,Konkuk University | Kim P.,Konkuk University | Park J.H.,Korea Dyeing Technology Center | Kim J.,Konkuk University | Kim J.-C.,Konkuk University
Plasma Chemistry and Plasma Processing | Year: 2013

To identify the decomposition characteristics of trimethylamine (TMA) by electron beam (EB), we conducted an experiment based on process parameters, including absorbed dose (2.5-10 kGy), background gas (air, O2, N 2 and He), water content (1,200, 14,300, and 27,500 ppm), initial concentration (50, 100, and 200 ppm) and reactor type (batch or continuous flow system). Air background gas showed a maximum TMA removal efficiency of 86 % at 10 kGy and that was the highest efficiency of all background gases. Energy efficiencies were higher when the absorbed dose was lower (e.g., 2.5 kGy). Decomposition efficiencies of all initial TMA concentrations were approximately >90 % at 10 kGy. Removal efficiencies increased up to 30 % as water vapor increased. As a by-product, it is observed that CH3 radical formed by EB irradiation was converted into CH4 by reaction with residual TMA, (CH3)2NH, and H. These results suggest that EB technology can be applied for TMA treatment under low concentration and high flow rate conditions. © 2013 Springer Science+Business Media New York.

Bae J.S.,Kyungpook National University | Kim S.H.,Kyungpook National University | Son Y.A.,Chungnam National University | Lee D.H.,Korea Dyeing Technology Center
Technical Proceedings of the 2013 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2013 | Year: 2013

Colorimetric chemosensors are now considered as one of the most effective analytical method used in the environment monitoring. Colorimetric chemosensors for pH sensing can easily detect the primary danger or change of the surrounding environment pollution and source of infection and can prevent danger in the various fields. Quinaldine and Indole based colorants having the function of colorimetric chemosensors were synthesized. Synthesized colorants were characterized by 1H NMR, GC-Mass, EA and UV-Vis spectroscopy. Especially UV-Vis spectroscopy revealed that the color of each colorant solution was changed in basic conditions while no changes were observed in acidic condition. And then synthesized colorants were mixed with poly-acrylonitrile for electrospinning. Electrospun fibers containing each colorant were used as pH textile sensors and they were analyzed by Spectrophotometer.

Karim M.R.,Kyungpook National University | Lee H.W.,Kyungpook National University | Woo C.,Kyungpook National University | Park S.M.,Korea Dyeing Technology Center | And 2 more authors.
Polymer Composites | Year: 2010

Conducting polyaniline (PAni)-titanium dioxide (TiO2) nanocomposites have been synthesized by the inverted emulsion polymerization method. Aqueous mixtures of aniline, a free-radical oxidant, and/or TiO 2 nanopar- ticles (∼25 nm in diameter; mixture of anatase and ru- tile) are utilized to synthesize the hybrid nanocompo-sites. The polymerization is carried out in an organic solvent (chloroform, CHCl3) in the presence of a pro- tonic acid (hydrochloric acid, HCl) as a dopant and an emulsifier (cetyl trimethylammonium bromide). The resultant PAni-TiO2 nanocomposites are characterized with their structural, morphological, conducting, and optical properties. SEM and TEM images represent the PAni-TiO2 nanocomposites with the diameter range of 50-200 nm. Electrical conductivities are checked by standard four-point probes method and found to be 0.38 S/cm for bulk PAni and 0.11 S/cm for PAni-TiO2 nanocomposites. UV-visible absorption shows two electronic bands at about 320 and 596 nm for bulk PAni and the blue-shifted bands with the intensity changes due to the formation of PAni-TiO2 composites. Thermogravimetric analysis reveals that the composites have a higher degradation temperature than the PAni alone. POLYM. COMPOS., 31:83-88, 2010. © 2009 Society of Plastics Engineers.

Park J.H.,Kyungpook National University | Park S.M.,Korea Dyeing Technology Center | Kim Y.H.,Kyungpook National University | Oh W.,Dong - Eui University | And 4 more authors.
Journal of Composite Materials | Year: 2013

Zein is a hydrophobic protein produced from maize and has great potential in a number of industrial applications such as food, food coating and food packaging. The objectives of this study are to determine the effects of montmorillonite on the wettability and microstructure properties of zein/montmorillonite nanocomposite nanofiber mats fabricated by the electrospinning technique in ethyl alcohol aqueous solution. The zein/montmorillonite nanofiber mats were characterized by field-emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, differential scanning calorimetry, thermogravimetric analysis and contact angle measurements. This study shows that the introduction of montmorillonite resulted in the improvement of the thermal stability and hydrophilicity for the zein matrix. X-ray diffraction patterns and transmission electron microscopy micrographs suggest the coexistence of intercalated montmorillonite layers over the examined montmorillonite contents. Since montmorillonite is a hydrophilic clay, its addition can be used not only to produce nanomaterials with the already known improved properties but also to enhance the hydrophilicity of material. © The Author(s) 2012 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav.

Park J.H.,Kyungpook National University | Karim M.R.,King Saud University | Kim I.K.,Kyungpook National University | Cheong I.W.,Kyungpook National University | And 4 more authors.
Colloid and Polymer Science | Year: 2010

Poly(vinyl alcohol) (PVA)/montmorillonite clay (MMT)/silver (Ag) nanoparticles have been electrospun for fabricating PVA/MMT/Ag nanofiber in aqueous solutions. Since PVA is a water-soluble and biocompatible polymer, it is one of the best materials for preparation of antibacterial nanofiber. MMT has been used as an inorganic filler to enhance properties of homopolymeric nanofiber. The PVA/MMT/Ag nanofiber diameter increases with increasing contents of MMT clay and Ag nanoparticles. In preservation test, the PVA/MMT/Ag nanofiber confirms an excellent antibacterial performance, elucidating for practical uses as a new preservative. Moreover, the PVA/MMT/Ag nanofiber shows improved thermal properties. © 2009 Springer-Verlag.

Kim H.,Chungnam National University | Kim S.-H.,Kyungpook National University | Lee D.-H.,Korea Dyeing Technology Center | Son Y.-A.,Chungnam National University
Supramolecular Chemistry | Year: 2013

One of the organic dye materials which has long been investigated is regarded as rhodamine 6G dye class. This dye material shows a special attractive intention with considerable interests due to the reason of its promising photochemical properties such as clear photoabsorption and emission characteristics. In this study, a novel fluorescent dye compound based on rhodamine 6G derivative was designed and synthesised through the reaction of rhodamine 6G hydrazide and indole-3-carboxaldehdyde. The resulting absorption and fluorescent emission spectra of this chemosensor were determined on the properties of sensing function towards Hg2+. This chemosensor 1 was also investigated on the binding ratio between chemosensor 1 towards Hg 2+ using Job's method. Related electron density and energy state of the dye compound were also characterised by computational calculations. © 2013 Copyright Taylor and Francis Group, LLC.

Han B.,EB Technology Co. | Kim J.,EB Technology Co. | Kang W.,EB Technology Co. | Choi J.S.,Korea Dyeing Technology Center | Jeong K.-Y.,Kongju National University
Radiation Physics and Chemistry | Year: 2016

Due to the necessity of pilot scale test facility for continuous treatment of wastewater and gases on site, a mobile electron beam irradiation system mounted on a trailer has developed. This mobile electron beam irradiation system is designed for the individual field application with self-shielded structure of steel plate and lead block which will satisfy the required safety figures of International Commission on Radiological Protection (ICRP). Shielding of a mobile electron accelerator of 0.7 MeV, 30 mA has been designed and examined by Monte Carlo technique. Based on a 3-D model of electron accelerator shielding which is designed with steel and lead shield, radiation leakage was examined using the Monte Carlo N-Particle Transport (MCNP) Code. Simulations with two different versions (version 4c2 and version 5) of MCNP code showed agreements within statistical uncertainties, and the highest leakage expected is 5.5061×10-01 (1±0.0454) μSv/h, which is far below the tolerable radiation dose limit for occupational workers. This unit could treat up to 500 m3 of liquid waste per day at 2 kGy or 10,000 N m3 of gases per hour at 15 kGy. © 2015 Elsevier Ltd.

Kim Y.,EB Technology Co. | Kim J.,EB Technology Co. | Han B.,EB Technology Co. | Choi J.-S.,Korea Dyeing Technology Center | Lee M.-J.,Korea Atomic Energy Research Institute
Journal of the Korean Physical Society | Year: 2011

Textile dyeing processes consume a great amount of water and steam and discharge filthy and colored wastewater. Increased use of assorted dyes and other chemicals has increased the pace of reequipping purification facilities by applying efficient methods based on radiation technology. Based on laboratory data, a pilot-scale e-beam plant was constructed at the Daegu Dyeing Industrial Complex (DDIC) in 1998. An electron accelerator, 40 kW at 1 MeV, was used for 1,000 m3 per day. Continuous operation of this plant showed that the preliminary e-beam treatment reduced the bio-treatment time and resulted in significant decreases in the TOC (total organic carbon), CODCr (Chemical Oxygen Demand as dichromate method), and BOD5 (Biochemical Oxygen Demand in 5 days). Convinced of the economics and efficiency of the process, a commercial plant with a 400-kW electron accelerator was constructed in 2005. This plant improved the removal efficiency of wastewater by decreasing the retention time in a bio-treatment facility with a dose of approximately 1 kGy. This plant is located in the vicinity of an existing wastewater treatment facility in the DDIC, and the treatment capacity is 10,000 m3 of wastewater per day.

Han B.,EB Technology Co. | Kyu Kim J.,EB Technology Co. | Kim Y.,EB Technology Co. | Seung Choi J.,Korea Dyeing Technology Center | Young Jeong K.,Kongju National University
Radiation Physics and Chemistry | Year: 2012

Textile dyeing processes consume large amount of water, steam and discharge filthy and colored wastewater. A pilot scale e-beam plant with an electron accelerator of 1MeV, 40kW had constructed at Daegu Dyeing Industrial Complex (DDIC) in 1997 for treating 1,000m3 per day. Continuous operation of this plant showed the preliminary e-beam treatment reduced bio-treatment time and resulted in more significant decreasing TOC, CODCr, and BOD5. Convinced of the economics and efficiency of the process, a commercial plant with 1MeV, 400kW electron accelerator has constructed in 2005. This plant improves the removal efficiency of wastewater with decreasing the retention time in bio-treatment at around 1kGy. This plant is located on the area of existing wastewater treatment facility in DDIC and the treatment capacity is 10,000m3 of wastewater per day. The total construction cost for this plant was USD 4M and the operation cost has been obtained was not more than USD 1M per year and about USD 0.3 per each m3 of wastewater. © 2012 Elsevier Ltd.

Son Y.-S.,Konkuk University | Park J.-H.,Korea Dyeing Technology Center | Kim P.,Konkuk University | Kim J.-C.,Konkuk University
Radiation Physics and Chemistry | Year: 2012

In this research, the absorbed dose, background gases, relative humidity, and initial concentrations were selected as control factors to discover decomposition characteristics of styrene using electron beam irradiation. It was confirmed that a considerable amount of styrene was removed by primary electrons as well as radicals and ions, which were produced after the electron beam irradiation. Moreover, the removal efficiencies of styrene were observed to rise when the initial concentration was lower, moisture content was higher, and the absorbed dose increased. For instance, 50ppmv styrene showed extremely high removal efficiency (over 98%) at a condition of 2.5kGy. A small amount of styrene oxide, benzaldehyde, aerosol, CO, and CO 2 were produced as by-products after EB irradiation. © 2012 Elsevier Ltd.

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