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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Applied Chemistry for Engineering
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Journal DOI :
The Korean Society of Industrial and Engineering Chemistry
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Volume & Issues
Volume 19, Issue 3 - Jun 2008
Volume 19, Issue 6 - 00 2008
Volume 19, Issue 5 - 00 2008
Volume 19, Issue 4 - 00 2008
Volume 19, Issue 2 - 00 2008
Volume 19, Issue 1 - 00 2008
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Technology Trends in Fabrication of Nanostructures of Metal Oxides by Anodization and Their Applications
Choi, Jin-Sub ; Lee, Jae-Kwang ; Lim, Jae-Hoon ; Kim, Sung-Joong ;
Applied Chemistry for Engineering, volume 19, issue 3, 2008, Pages 249~258
Nanoporous alumina with highly ordered pore arrays, which is prepared based on electrochemical anodization under the controlled conditions, has attracted great attention due to the variety of its applications. In case of porous alumina, the manipulation of nanoporous structures under different electrochemical conditions and their formation mechanisms have been studied for a long time. Recently, its principles have been applied to other valve metals. Especially, there have been a big success in the preparation of titania nanotubes via the anodization of titanium. In this paper, we review the anodization of aluminum and recent trends in anodization of Ti and other valve metals based on the principles of aluminum anodization
Deactivation and Regeneration of a Used De-NOx SCR Catalyst for Wastes Incinerator
Lee, Sang-Jin ; Hong, Sung-Cahng ;
Applied Chemistry for Engineering, volume 19, issue 3, 2008, Pages 259~263
The catalytic activity of the used catalyst, V2O5/TiO2, for MSW incinerators was investigated focusing on its regeneration. As the result of the experimental analysis, the NOx removal efficiency difference between the fresh catalyst and used catalyst is about 60% at 260 and 1, 2-dichlorobenzen (1, 2-DCB) removal efficiency difference is about 14% at 200 , in honeycomb test. And the catalysts, both the fresh and used, were characterized by XRD, TGA, and ICP techniques in order to investigate the deactivation. On the basis of the results, it is found that the used catalyst is deactivated by ammonium-sulfates, heavy metals (Pb, As etc.), alkali metals (Ca), and phase transfer of TiO2. Also calcination treatment under nitrogen and air condition was excellent than washing and calcination treatment.
Studies on Particle Size Control and Stability of Lead Chromate Pigment Particles
Park, Chan-Kyu ; Jung, Dae-Yoon ; Chang, Sang-Mok ; Lee, Sang-Rok ;
Applied Chemistry for Engineering, volume 19, issue 3, 2008, Pages 264~269
For the synthesis of lead chromate pigments, we investigated the characteristics of particle growth with reacting conditions in the synthetic process, the effect of additives, and its micro-capsulation. The more tiny and uniform dispersion particles could be obtained at a lower pH and diluter intial concentration. The variation range of average pigment size was increased with the agitating speed. The pigment size could be controlled by adding aluminum sulfate as an additive, which maintained the optimum particle dispersion. It was found that the optimum micro-capsulation conditions were pH 9 10 and above 90 during the micro-capsulation of lead chromate pigment, and below 0.5% humidity after micro-capsulation.
Using Thermal Plasma and Comparison of Photocatalytic Characteristics
Kim, Min-Hee ; Park, Dong-Wha ;
Applied Chemistry for Engineering, volume 19, issue 3, 2008, Pages 270~276
N2 doped TiO2 nano-sized powder was prepared using a DC arc plasma jet and investigated with XRD, BET, SEM, TEM, and photo-catalytic decomposition. Recently the research interest about the nano-sized TiO2 powder has been increased to improve its photo-catalytic activity for the removal of environmental pollutants. Nitrogen gas, reacting gas, and titanium tetrachloride (TiCl4) were used as the raw materials and injected into the plasma reactor to synthesize the N2 doped TiO2 power. The particle size and XRD peaks of the synthesized powder were analyzed as a function of the flow rate of the nitrogen gas. Also, the characteristics of the photo-catalytic decomposition using the prepared powder were studied. For comparing the photo-catalytic decomposition performance of TiO2 powder with that of TiO2 coating, TiO2 thin films were prepared by the spin coating and the pulsed laser deposition. For the results of the acetaldehyde decomposition, the photo-catalytic activity of TiO2-xNx powder was higher than that of the pure TiO2 powder in the visible light region. For the methylene blue decomposition, the decomposition efficiency of TiO2 powder was also higher than that of TiO2 film.
Theoretical Consideration of the Modified Haldane Model of the Substrate Inhibition in the Microbial Growth Processes
Hwang, Young-Bo ;
Applied Chemistry for Engineering, volume 19, issue 3, 2008, Pages 277~286
This paper deals with the theoretical derivation of the modified Haldane model of the substrate inhibition in the microbial growth processes. Based on the biological concepts of substrate-receptor complex working mechanisms, a new microbial kinetics of N-fold multiplex substrate inhibition and its generalization has been considered theoretically, which is natural expansion of the simple substrate inhibition mechanism in the enzyme reaction. As a result, the modified Haldane model of the substrate inhibition turns out to be a well-designed four-parameter kinetic model with a biological constant of the total substrate inhibition concentration.
The Preparation of Chiral Separation Membranes by UV Polymerization and its Properties
Chang, Eun-Jeong ; Hong, Joo-Hee ; Heo, Kwang-Beom ; Kim, Min ; Kim, Byoung-Sik ;
Applied Chemistry for Engineering, volume 19, issue 3, 2008, Pages 287~294
Attrition Characteristics in an Advanced Gasifier with Swirl Injection
Lee, See-Hoon ; Park, Chan-Seung ; Lee, Jae-Goo ; Kim, Jae-Ho ;
Applied Chemistry for Engineering, volume 19, issue 3, 2008, Pages 295~298
Synthesis and Characterization of Thermally Cross-linkable Hole Transporting Material Based on Poly(p-phenylenevinylene) Derivative
Choi, Ji-Young ; Lee, Bong ; Kim, Joo-Hyun ;
Applied Chemistry for Engineering, volume 19, issue 3, 2008, Pages 299~303
A thermally cross-linkable polymer, poly[(2,5-dimethoxy-1,4-phenylenevinylene)-alt-(1,4-phenylenevinylene)] (Cross-PPV), was synthesized by the Heck coupling reaction. In order for the polymer to be cross-linkable, 20 mol% excess divinylbenzene was added. The chemical structure of Cross-PPV and thermally crosslinked Cross-PPV were confirmed by FT-IR spectroscopy. From the FT-IR, UV-Vis, and PL spectral data, thermally crosslinked Cross-PPV was insoluble in common organic solvents. The HOMO and LUMO energy level of thermally cross-linked Cross-PPV were estimated -5.11 and -2.56 eV, respectively, which were determined by the cyclic voltammetry and UV-Vis spectroscopy. From the energy level data, one can easily notice that thermally crosslinked Cross-PPV can be used for hole injection layer effectively. Bilayer structured device (ITO/crosslinked Cross-PPV/PM-PPV/Al) was fabricated using poly(1,4-phenylenevinylene-(4-dicyanomethylene-4H-pyran)- 2,6-vinylene-1,4-phenylenevinylene-2,5-bis(dodecyloxy)-1,4-phenylenevinylene (PM-PPV) as the emitting layer, which have HOMO and LUMO energy levels of -5.44 eV and -3.48 eV, respectively. The bilayered device had much enhanced the maximum efficiency (0.024 cd/A) and luminescence (45 cd/m2) than those of a single layer device (ITO/PM-PPV/Al, 0.003 cd/A, 3 cd/m2). The enhanced performance originated from that fact that cross-linked Cross-PPV facilitatse the hole injection to the emissive layer and the injected hole and electron from ITO and Al are recombined in emitting layer (PM-PPV) effectively.
Adsorption of Uranium (VI) Ion on the 1-Aza-12-Crown-4-Styrene-DVB Synthetic Resin Adsorbent
Kim, Joon-Tae ;
Applied Chemistry for Engineering, volume 19, issue 3, 2008, Pages 304~309
Cryptand series ion exchange resins were synthesized with 1-aza-12-crown-4 macrocyclic ligand attached to styrene (4 series dangerous matter) divinylbenzene (DVB) copolymer with crosslink of 1％, 2％, 4％ and 8％ by a substitution reaction. The synthesis of these resins was confirmed by content of chlorine, element analysis, electron micrograph, and IR-spectrum. The effects of pH, time, dielectric constant of solvent and crosslink on adsorption of uranium (UO22+) ion were investigated. The uranium ion showed a fast adsorption on the resins above pH 3. The optimum equilibrium time for adsorption of metallic ions was about two hours. The adsorption selectivity determined in ethanol was in increasing order uranium (UO22+) > nickel (Ni2+) > gadolinium (Gd3+) ion. The adsorption was in order of 1％, 2％, 4％, and 8％ crosslinked resin and adsorption of resin decreased in proportion to order of dielectric constant of solvents.
Tailoring of the Chemical Resistance of Chrome Yellow Particles by Silica Coating
Lee, See-Woo ; Kim, Seong-Soo ; Kim, Dong-Uk ; Wang, Lin ; Choi, Hee-Kyu ;
Applied Chemistry for Engineering, volume 19, issue 3, 2008, Pages 310~315
Herein, we synthesized silica-coated chrome yellow particles having improved chemical resistance. The intermediate with a good dispersion stability was prepared and the chemical resistance of the final product was investigated. The effects of pH and temperature, as the main parameters influencing the formation of particles, the reduced particle size by homogenizer on the silica coating were investigated. The change in the particle morphology by temperature and pH was also studied. As the results, small and monodisperse particles were achieved at low pH and high temperature. Good silica coating was obtained when used reduced size of the particles by homogenizer. Furthermore, the sufficient silica coating by microencapsulation was obtained at 9 10 pH and the temperature above 90 .
Synthesis of Monodispersed Magnetic Polymer Particle
Ahn, Byung-Hyun ;
Applied Chemistry for Engineering, volume 19, issue 3, 2008, Pages 316~321
Monodispersed particles of poly(styrene-co-4-vinylpyridine), poly(st-co-4vp) were prepared by soapless emulsion polymerization. Iron oxide was formed on the surface and inside of the poly(st-co-4vp) particles by thermal decompostion of iron pentacarbonyl. The obtained magnetic poly(st-co-4vp) particles was mondispersed and the average size was 250 nm. The magnetic poly(st-co-4vp) particles had 14% of iron oxide, which was identified as Fe3O4 by XRD. The magnetic poly(st-co-4vp) particles had superparamagnetism according to superconducting susceptometer (SQUID).
Deposition of Amorphous Carbon Layer by PECVD
Jung, Il-Hyun ;
Applied Chemistry for Engineering, volume 19, issue 3, 2008, Pages 322~325
Variation of Characteristics of Nonstoichiometric Apatite Induced by Sodium Salt
Jung, Jae-Young ; Han, Ju-Yun ; Choi, Sun-Mi ; Lee, Woo-Kul ;
Applied Chemistry for Engineering, volume 19, issue 3, 2008, Pages 326~331
The purpose of this work is to develope sodium-containing nonstoichiometric apatitic coatings on solid substrate. The apatitic coatings prepared at different concentrations of sodium salt indicated that the presence of sodium ions exerted significant effects on the physicochemical properties of the apatitic coating including surface morphology, chemical state, and Ca/P ratio. The variation of these properties was sustained up to 0.01 mM of sodium ion concentration. The ratio of calcium to phosphorus was varied from 2.18 to 2.03 which indicated the apatitic coating prepared in this study was calcium-rich nonstoichiometric apatite. The structure of all the samples appeared to be low crystalline. In the presence of sodium ion within the apaptitic coating, the adhesion of human osteoblast-like SaOS-2 cells was significantly promoted. On the other hand, the proliferation of the cells on the apatitic coatings was decreased with the increase of sodium ions. This reverse response of SaOS-2 cells indicates that the interaction between SaOS-2 and apatitic surface triggered considerable changes in intracellular mechanisms including cellular signal transductions.
Study on the Synthesis of Low Molecular Weight Silicones Modified with Polyethers
Chung, Dae-Won ;
Applied Chemistry for Engineering, volume 19, issue 3, 2008, Pages 332~337
Hydrosilylation reaction of 1,1,1,3,5,5,5-heptamethyl trisiloxane (HMTS) and unsaturated poly(oxyethylene) (UPOE) was carried out in the presence of Speier's catalyst. The effect of molar ratio of two reagents on the reactivity and the structure of the product (HMTS-POE) were investigated by FT-IR and 1H-NMR. The pure HMTS-POE without containing unreacted HMTS or UPOE could be obtained by the reaction with excess amount of HMTS and followed by removing unreacted HMTS under vacuum. Under the same reaction conditions, various HMTS-POEs composed of UPOEs with a different molecular weight were synthesized, and the surface tensions of HMTS-POEs were analyzed. HMTS-POE, whose EO contents are in the range of 49 57%, exhibited lower surface tension and a potential application for low molecular weight silicone modified with polyethers.
A Study on Improvement of Performance of Absorber in Absorption Heat Pump
Min, Byong-Hun ;
Applied Chemistry for Engineering, volume 19, issue 3, 2008, Pages 338~344
The improvement of energy conservation is mandatory to decrease consumption of fossil fuels and to minimize negative impacts on the environment which originates from large cooling and heating demand. The absorption heat pump technology has a large potential for energy-saving in this respect. Absorption heat pump is a means to upgrade waste heat without the addition of extra thermal energy. The higher performance of absorber is of great importance for absorption heat pump cycle. In this study, in order to improve the performance of absorber, the absorber of tangential feed of a liquid phase with spiral tube has been investigated using methanol-glycerine as a working fluid. The spiral tube and tangential feeding generate the turbulence into the liquid flow while increasing the mass and heat transfer coefficients. The simultaneous heat and mass transfer were found to take place in a liquid turbulent film in the absorber with the spiral tube during the process of gas absorption. By calculating mass and heat transfer coefficients by measurement of the concentration and the temperature of each position in the absorber, the entrance was found to be more effective in enhancing mass and heat transfer.
Physical Properties of Polymer Impregnated Concrete Prepared using Microwave Radiation
Ku, Du-Hyun ; Park, Jung-Soon ; Park, Heon-Young ; Hur, Myung-Jun ; Lee, Won-Mook ;
Applied Chemistry for Engineering, volume 19, issue 3, 2008, Pages 345~350
Polymer Impregnated Concrete (PIC) prepared from Ordinary Portland Cement Concrete (OPC) has excellent mechanical properties as well as physico-chemical properties. For the manufacturing of PIC, drying process of basis concrete (precast concrete), impregnation process with evacuation system and ultrasonic vibration system, polymerization process of monomers are essential. Modified microwave reactor using magnetron was used for polymerization of styrene/MMA (1 : 1) impregnated in pore volume of basis concrete. From the experimental results, the degree of polymerization increased up to 30% and more homogeneous PIC was prepared as compared to the conventional thermal method. Also the mechanical strengths increased more than 400% (800 1200 kgf/cm2) and the resistance for corrosion to acids was improved up to 25%. AIBN and BPO as initiators for polymerization were used at the concentration less than 1%. Optimum conditions for polymerization were obtained at the frequency of microwave of 400 W and 2450 MHz, and optimum reaction temperature was 120 at an atmospheric pressure.
Synthesis of Titanium Dioxides by Microemulsion Method and Their Photocatalytic Degradation of p-Nitrophenol
Jung, Won-Young ; Han, Yeon-Hee ; Lee, Gun-Dae ; Park, Seong-Soo ; Hong, Seong-Soo ;
Applied Chemistry for Engineering, volume 19, issue 3, 2008, Pages 351~356
Titania nanoparticles were prepared by controlled hydrolysis of titanium tetraisopropoxide (TTIP) in water-in-oil (W/O) and microemulsion stabilized with a nonionic surfactant, N P-10 (Polyoxyethylene Nonylphenol Ether: C9H19C6H4 (OCH2 CH2)10OH)). The nanosized particles prepared in W/O microemulsion were characterized by FT-IR, TEM, XRD, TGA, and DTA. In addition, the photocatalytic degradation of p-nitrophenol has been studied by using a batch reactor in the presence of UV light in order to compare the photocatalytic activity of prepared nanosized titania. The nanaosized titania particles calcined at 300 600 showed an anatase structure, but it transformed to a rutile phase above 700 of calacination temperature. With an increase of Wo ratio, the crystallite size increased but photocalytic activity decreased. The titania synthesized at Wo = 5, R = 2, and calcined at 400 500 showed the highest activity on the photocatalytic degradation of p-nitrophenol.