Chul Kyung Kim

Mokwon University, Daiden, Daejeon, South Korea

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Publications (2)4.2 Total impact

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    ABSTRACT: In this work, it was investigated the effect of solubility in supercritical CO2 on the nickel-electroplating characteristics. The plating characteristics could be controlled by electric resistance and dispersion in emulsion as well. CO2 concentration had better be controlled at lower concentration than 50 CO2 wt% to decrease electric resistance since supercritical CO2 is non-polar material. Non-ionic surfactant with EO/PO block copolymer was more efficient than any other surfactant and the dispersion at 0.2 surfactant wt% was better than at any surfactant concentration and over-added surfactant concentration over 0.2 wt% brought to the decrease of dispersion properties. Electric resistance was constant at 20Omega in ranging from pH 2.2 to pH 3.5 and increased slowly to 50Omega at pH 4 and rapidly to 400Omega at pH 5. Characteristics of nickel film has a close relation with solubility in supercritical CO2 and solubility is dependent on pressure and temperature. Solubility at 16 MPa was higher than that any other at pressure and at constant pressure of 16 MPa, solubility in supercritical CO2 increased with an increasing temperature from 31 to 45 degrees C and decreased over 45 degrees C.
    Chemosphere 02/2005; 58(4):459-65. · 3.14 Impact Factor
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    ABSTRACT: Experiments were performed to investigate the effect of operating parameters on the photodegradation efficiency of paraquat in a TiO 2 -suspended photoreactor with immersed UV lamps. TiO 2 particles were prepared by a hydrothermal method. The removal rate of paraquat in the reactor was 0.54 mg/l/h with only air-sparging. The removal rate in 24 h with both the UV radiation and air-sparging was 50% higher than that with only the UV radiation. Variations of the paraquat concentration at the UV intensities of 4 and 8 W/m 2 decreased slowly with time, but that at 12 W/m 2 decreased more rapidly. The removal efficiency at the air-sparging flow rate of 1 l/min increased as a UV light intensity increased. pH value in the reactor at the UV intensity of 12 W/m 2 decreased with time until 12 h and then increased with time over 12 h.
    Korean Journal of Chemical Engineering 01/2003; 20:862-868. · 1.06 Impact Factor