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Lee E.-M.,FITI Testing and Research Institute | Gwon S.-Y.,Kyungpook National University | Kim S.-H.,Kyungpook National University
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2014

A (E)-2-(2-(2-(1H-indol-3-yl)vinyl)-4H-chromen-4-ylidene)malononitrile (dye 1) was synthesized and its cation sensing properties in DMSO were investigated by UV-vis spectroscopy. Upon the addition of Hg2+, the solution of dye 1 showed color change and the absorption band shows a formation of a 1:1 dye 1-Hg2+ coordination complex. The dye 1 exhibited high selectivity for Hg2+ as compared with other cations. Interestingly, the dye 1-F- complex also could be recovered by adding Hg2+. We have investigated the ability of complex formation based on the association constant, Kass; the binding ability for the complex formation of dye 1-F- and Hg2+ is greater than that of the dye 1 with F-. © 2013 Elsevier B.V. All rights reserved. Source

Kim H.K.,FITI Testing and Research Institute | Yuu J.,Golden Pow Co. | Jeon H.Y.,Inha University
GA 2012 - 5th Asian Regional Conference on Geosynthetics: Geosynthetics for Sustainable Adaptation to Climate Change | Year: 2012

In this study, key properties of polyethylene resin and HDPE GM were tested for comparing their stress crack behaviors. Stress cracking time was differed from each type of resins and products. The failure times of ESCR test were too long compared to SP-NCTL's. The SP-NCTL results of RWOA was failed earlier than RWA's, GM1's and GM2's. But there was no difference between each sample of the results of ESCR test within short term testing duration. The ESCR test was influenced by stress relaxation during the test. The SP-NCTL test is reasonable for verifying stress cracking behavior and construction quality control. According to this study, ESCR test is not appropriate for determining the stress crack behavior, but SP-NCTL test is better test method for predicting the stress crack behaviors of HDPE GM. Source

Cho K.S.,Kyungpook National University | Song K.-W.,Pusan National University | Chang G.-S.,FITI Testing and Research Institute
Journal of Rheology | Year: 2010

We have found empirical scaling relations in nonlinear viscoelasticity of poly(ethylene oxide) (PEO) solutions under large amplitude oscillatory shear flow. The scaling relations superpose dimensionless nonlinear viscoelastic functions, such as the normalized amplitudes of elastic and viscous stresses and normalized Fourier intensities, measured at different strain amplitudes and frequencies on a single curve irrespective of the molecular weight and the concentration of the polymer solutions. The scaling relations reveal that the nonlinear viscoelastic functions are functions of dimensionless variable ζ ≡ γo cos δ (ω), where δ is the phase lag of linear viscoelasticity. The validity of our superposition was checked for PEO aqueous solutions under the conditions that concentration: 3 Source

Han W.-S.,Hanseo University | Lee H.-J.,FITI Testing and Research Institute | Lee J.-S.,National Institute of Environmental Research Complex | Lee Y.-H.,Hanseo University | Hong T.-K.,Hanseo University
Journal of Analytical Chemistry | Year: 2014

A cyanide ion selective poly(aniline) solid contact electrode based on nickel complex of N,N′-bis-(4-phenylazosalicylidene)-o-phenylenediamine ionophore was successfully developed. The electrode exhibits a good linear response of 58.7 mV/decade (at 20 ± 0.2 C, r 2 = 0.998) with in the concentration range of 1 × 10-1.0-1 × 10 -6.0 M cyanide. The composition of this electrode was: ionophore 0.300, polyvinylchloride 0.300, 2-nitrophenyloctyl ether 0.670 (mass). This 2-nitrophenyloctyl ether plasticizer provides the best response characteristics. The electrode shows good selectivity for cyanide ion in comparison with any other anions and is suitable for use with aqueous solutions of pH 4.6-6.3. The standard deviations of the measured emf difference were ±1.92 and ±1.87 mV for cyanide sample solutions of 1.0 × 10-2 M and 1.0 × 10-3 M, respectively. The stabilization time was less than 183 s and response time was less than 38 s. © 2014 Pleiades Publishing, Ltd. Source

Kim S.-H.,Kyungpook National University | Lee E.M.,FITI Testing and Research Institute | Bae J.-S.,Kyungpook National University
Sen'i Gakkaishi | Year: 2015

Naphthazarin(5,8-dihydroxy-1,4-naphthoquinone) exhibited high selectivity for F-, as compared with CN-, Cl-, Br-, HSO4-, H2PO4-, ClO- and NO3- in DMSO, which was attributed to the formation 1 : 1 complex. Interestingly, the blue color of the naphthazarin-F- complex could be recovered after the addition of Cr3+. We have investigated the ability of complex formation based on the association constant, Kass ; the binding ability for the complex formation of naphthazarin-F- and Cr3+ is much greater in DMSO (Kass =5.3 × 104 M-1) than that of the naphthazarin with F- (Kass =2.0 × 103 M-1). © 2015, Society of Fiber Science and Technology. All rights reserved. Source

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