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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean Chemical Engineering Research
Journal Basic Information
Journal DOI :
The Korean Institute of Chemical Engineers
Editor in Chief :
Volume & Issues
Volume 48, Issue 6 - Dec 2010
Volume 48, Issue 5 - Oct 2010
Volume 48, Issue 4 - Aug 2010
Volume 48, Issue 3 - Jun 2010
Volume 48, Issue 2 - Apr 2010
Volume 48, Issue 1 - Feb 2010
Selecting the target year
Development of Anti-Wrinkle Agent from Nelumbo nucifera Root Extract
Kim, Hee-Jin ; Kim, Ta-Gon ; Kang, Whan-Yul ; Baek, Hyun ; Cheon, Hae-Young ; Kim, Bo-Young ; Kim, Dong-Uk ;
Korean Chemical Engineering Research, volume 48, issue 4, 2010, Pages 413~416
In this research, root extracts of Nelumbo nucifera was tested to see the possibility for functional cosmetic agent. 70-100% ethanol was used as solvent and nuciferin was confirmed as active component. To test cosmetic effect of root extracts of Nelumbo nucifera, safety effect(MTT assay), anti-wrinkle effect(elastase inhibition assay) and antioxidation effect(DPPH free radical scavenging assay) were measured. When 100% ethanol was used as extracting solvent, cell viability was over 80% at
, which indicated that root extract of Nelumbo nucifera was suitable for cosmetic agent. Root extract of Nelumbo nucifera showed 40~50% elastase inhibition at
so that it had good anti-wrinkle characteristics. 50% antioxidation capacity(
and root extract of Nelumbo nucifera showed excellent antioxidation effect. From the research, root extracts of Nelumbo nucifera showed strong possibility for anti-wrinkle functional cosmetic agent.
Synthesis of Titanium Dioxides from Peroxotitanate Solution Using Hydrothermal Method and Their Photocatalytic Decomposition of Methylene Blue
Jung, Won-Young ; Lee, Seung-Ho ; Kim, Dae-Sung ; Lee, Gun-Dae ; Park, Seong-Soo ; Hong, Seong-Soo ;
Korean Chemical Engineering Research, volume 48, issue 4, 2010, Pages 417~422
particles were prepared by hydrothermal method from the aqueous peroxotitanate solution using the different carboxylic acids as an additives. The physical properties of prepared nanosized
particles were investigated and we also examined the activity of
particles as a photocatalyst on the decomposition of methylene blue. The major phase of all the prepared
particles was an anatase structure regardless of carboxylic acids and a rutile peak was observed above
. The photocatalytic activity increased with an increase of hydrocarbon number of carboxylic compounds and the highest activity was shown on the catalysts which was prepared using succinic acid as an additive and calcined at
Support Effect of Nano Structured Carbon Nano Sphere and Nano Bowl of Carbon in the Phenol Hydroxylation and its Solvent Dependence
Kwon, Song-Yi ; Yoon, Song-Hun ; Kim, Hui-Yeong ; Lee, Jae-Wook ; Lee, Chul-Wee ;
Korean Chemical Engineering Research, volume 48, issue 4, 2010, Pages 423~427
Carbon nano sphere(CNS) and nano bowl of carbon(NBC) containing 1.0 wt% copper were prepared by impregnation method and their catalytic activity was compared in the phenol hydroxylation with hydrogen peroxide in the presence of water and acetonitrile as a solvent, respectively. Cu content of catalysts was determined by EDS, and BET, pore volume, pore size and pore size distribution were compared. For both catalysts, phenol conversion,
efficiency and yield of catechol and hydroquinone were higher in the presence of water as a solvent than those in the presence of actonitrile. And catalytic activity such as phenol conversion and
efficiency of 1.0 Cu/CNS is about two times higher than that of 1.0 Cu/NBC in water solvent.
Preparation of Waterborne Polyurethane/Silica Nanocomposites Using Tetraethylorthosilicate
Shin, Yong-Tak ; Hong, Min-Gi ; Choi, Jin-Joo ; Lee, Won-Ki ; Lee, Gyoung-Bae ; Yoo, Byung-Won ; Lee, Myung-Goo ; Song, Ki-Chang ;
Korean Chemical Engineering Research, volume 48, issue 4, 2010, Pages 428~433
Waterborne polyurethane(WPU) was synthesized from isophorone diisocyanate(IPDI), poly(tetramethylene glycol)(PTMG), dimethylol propionic acid(DMPA), triethylamine(TEA), ethylenediamine(EDA) and 3-aminopropyl triethoxysilane(APS) as a coupling agent. Subsequently, WPU/silica nanocomposites with different silica contents(0 to 8 wt%) were prepared by performing sol-gel reactions with tetraethylorthosilicate in the WPU matrix. The average particle size of the nanocomposite solutions increased with increasing TEOS content. Also, the prepared nanocomposites showed better thermal stability than pure WPU.
Preparation and Properties of Aminosilane Terminated Waterborne Polyurethane
Shin, Yong-Tak ; Hong, Min-Gi ; Choi, Jin-Joo ; Lee, Won-Ki ; Lee, Gyoung-Bae ; Yoo, Byung-Won ; Lee, Myung-Goo ; Song, Ki-Chang ;
Korean Chemical Engineering Research, volume 48, issue 4, 2010, Pages 434~439
NCO terminated polyurethane prepolymers were synthesized from isophorone diisocyanate(IPDI), poly(tetramethyleneglycol)(PTMG) and dimethylol propionic acid(DMPA). Subsequently, aminosilane terminated prepolymers were prepared by capping the NCO groups of polyurethane prepolymers with different moles of aminopropyl triethoxysilane(0~0.02 mole) as a coupling agent. The average particle size of the silylated polyurethane solutions increased with increasing APS content. Also, the prepared coating films showed better thermal stability and pencil hardness than pure waterborne polyurethane.
Supercapacitive Properties of a Hybrid Capacitor Consisting of Co-Mn Oxide Cathode and Activated Carbon Anode
Kim, Yong-Il ; Yoon, Je-Kook ; Kown, Je-Sung ; Ko, Jang-Myoun ;
Korean Chemical Engineering Research, volume 48, issue 4, 2010, Pages 440~443
A hybrid supercapacitor consisting of Co-Mn oxide as a cathode, activated carbon as an anode, and 6 M KOH as a electrolyte was fabricated and its supercapacitor performance was investigated by means of cyclic voltammetry. The prepared supercapacitor showed the specific capacitance of 67.3 F/g, energy density of 18.3 Wh/kg, and power density of 237.7 kW/kg, respectively. It means that the supercapacitor can be used for the practical applications.
Effects of Sulfonation Ratio in Petroleum Sulfonate Synthesis on Interfacial Properties and on Fluidity Properties of Cement Mortar
Kim, Young-Ho ;
Korean Chemical Engineering Research, volume 48, issue 4, 2010, Pages 444~449
In this study, the petroleum sulfonate(PS) was synthesized from pyolyzed fuel oil by sulfonation reaction with sulfuric acid. The PS synthesized had surfactant behaviors relating to the interfacial properties such as surface tension, surface adsorption, and wetting, etc. These interfacial properties were affected by the sulfonation ratio in the synthesis. As the sulfonation ratio increased, the surface tension of the PS aqueous solution decreased. However, when the ratio was too high, the surface tension was increased due to the extremely higher value of hydrophilicity of PS. At the optimum sulfonation ratio, the PS had a good wettability on the cement particles and a good fluidity of the cement mortar with a high adsorption.
A Study on the Features of the Velocity Distribution and the Static Pressure Distribution of Oil on a Low-velocity Piston
Park, Hei-Jae ; Choi, Jae-Wook ; Kim, Sang-Do ;
Korean Chemical Engineering Research, volume 48, issue 4, 2010, Pages 450~456
This study was conducted in order to design a piston, part of a shock absorber, and the findings after examining the features of the velocity distribution and the static pressure distribution of oil on a low-velocity piston are as follow. The compression speed of oil passing through an 0.9 mm orifice was 0.0156~0.0642 m/s, and the velocity vector of the velocity distribution and the static pressure distribution had a greater tendency to rotate when the velocity increased. In case of the velocity vector of the velocity distribution and the static pressure distribution with an 0.8mm orifice, the speed changed secondarily, the second pressure-drop was observed and as for the distribution of the streamline around the orifice, a vortex was produced around the center. As for the velocity distribution of oil passing from the compression cylinder to the compact pipe, the velocity was greater in orifice of small diameter. Also, the greater the pressure difference was between the compression cylinder and the compact cylinder, the greater the force it was upon the piston.
A Study on Safety Evaluation of Chemical Fiber Rope Manufacture
Park, Hei-Jae ; Mok, Yun-Soo ; Choi, Jae-Wook ; Lim, Woo-Sub ;
Korean Chemical Engineering Research, volume 48, issue 4, 2010, Pages 457~461
After the industrial revolution, quantity production system has made the life of mankind rich and to fulfill the consumer's desire competitive power of the enterprise constantly make has made effort in quality, price and engineering department not remaining simple manufactures. But in such a change production lacked safety. Consequently, the main study studied in return domestic organization which produces a chemistry fiber rope to be used fact vessel or as a athletic equipment safety countermeasure. One of the assesment method on product liability, Checklist is showed that It can be used not as an evaluation but as a development factor of company. Also, checklist that used a study could expect that assist the company of management structure as well as improvement of product safety.
Analysis of Terminal Velocity, Drag Coefficient and Shape of Bubble Rising in High Viscous Fluid
Kim, Jin-Hyun ; Kim, Jung-Hyeun ;
Korean Chemical Engineering Research, volume 48, issue 4, 2010, Pages 462~469
Gas-liquid 2 phase processes are usually used in chemical, biochemical, environmental engineering and food process. For optimizing these processes, understanding bubble's precise movement and shape are needed. Bubble's movement and shape are effected by liquid's properties-viscosity, surface tension and bubble's properties-size, velocity. This paper deals with experimental data of bubble's movement and shape in high viscous silicone oil. Also, drag coefficient and deformation factor given by other researcher's papers and books are used to predicting and comparing bubble's terminal velocity, drag coefficient, deformation factor and shape with experimental value. Experimental data show that bubble moves faster when it moves in lower viscous silicone oil and it's drag coefficient is bigger when it moves in high viscous silicone oil. Bubble's shape is close to sphere when moving in high viscous silicone. Formulas proposed by Batchelor expect most accurate prediction for bubble's velocity and drag coefficient. Bubble's 2D shape predicted by Batchelor's energy balance, drag coefficient and deformation factor show excellent agreement with experimental bubble's 2D shape.
In situ Microfluidic Method for the Generation of Uniform PEG Microfiber
Choi, Chang-Hyung ; Jung, Jae-Hoon ; Lee, Chang-Soo ;
Korean Chemical Engineering Research, volume 48, issue 4, 2010, Pages 470~474
In this study, we presents a simple microfluidic approach for generating uniform Poly(ethylene glycol)(PEG) microfiber. Elongated flow pattern of monomer induced by sheath flow of immiscible oil as continuous phase is generated in Y-shape junction and in situ polymerization by UV exposure. For uniform microfiber, we investigate the optimized flow condition and draw phase diagram as function of Ca and Qd. At the region for stable elongated flow pattern, the microfiber generated in microfluidic chip is very uniform and highly reproducible. Importantly, the thickness of microfibers can be easily controlled by flow rate of continuous and disperse phase. We also demonstrate the feasibility for biological application as encapsulating FITC-BSA in PEG microfiber.
Soft Sensor Design Using Image Analysis and its Industrial Applications Part 1. Estimation and Monitoring of Product Appearance
Liu, J. Jay ;
Korean Chemical Engineering Research, volume 48, issue 4, 2010, Pages 475~482
In this work, soft sensor based on image anlaysis is proposed for quantitatively estimating the visual appearance of manufactured products and is applied to quality monitoring. The methodology consists of three steps; (1) textural feature extraction from product images using wavelet transform, (2) numerical estimation of the product appearance through projection of the textural features on subspace, and (3) use of latent variables of textural features (i.e., numerical estimates of product appearance). The focus of this approach is on the consistent and quantitative estimation of continuous variations in visual appearance rather than on classification into discrete classes. This approach is illustrated through the application to the estimation and monitoring of the appearance of engineered stone countertops.
Soft Sensor Design Using Image Analysis and its Industrial Applications Part 2. Automatic Quality Classification of Engineered Stone Countertops
Ryu, Jun-Hyung ; Liu, J. Jay ;
Korean Chemical Engineering Research, volume 48, issue 4, 2010, Pages 483~489
An image analysis-based soft sensor is designed and applied to automatic quality classification of product appearance with color-textural characteristics. In this work, multiresolutional multivariate image analysis (MR-MIA) is used in order to analyze product images with color as well as texture. Fisher's discriminant analysis (FDA) is also used as a supervised learning method for automatic classification. The use of FDA, one of latent variable methods, enables us not only to classify products appearance into distinct classes, but also to numerically and consistently estimate product appearance with continuous variations and to analyze characteristics of appearance. This approach is successfully applied to automatic quality classification of intermediate and final products in industrial manufacturing of engineered stone countertops.
Optimum Design of Rubber Injection Molding Process for the Preparation of Anti-vibration Rubber
Lim, Kwang-Hee ;
Korean Chemical Engineering Research, volume 48, issue 4, 2010, Pages 490~498
The optimum mold design and the optimum process condition were constructed upon executing process simulation of rubber injection molding with the commercial CAE program of MOLDFLOW(Ver. 5.2) in order to solve the process-problems of K company relating to air-traps and short-shots. The former occurs at the cavity edge of torquerod-bush and the latter takes place for the injection molding of dynamic dampers. As a result the process problem relating to air traps was solved by optimizing edge-angle and the number of gates to prevent the flow congestion of flow-front and to make the flow-front movement unaffected by congestion. For dynamic dampers of K company the unmolded flaw caused by their unfilled cavity was corrected by installing the air-vent at the confronting locations of both upstream and downstream of flow-front where air traps frequently occur. Besides the unmolded flaws were rectified by altering the position of gate from the upper to the middle or by increasing the number of gates. Thus the process problems of K company relating to air-traps and short-shots of torque-rod-bush and dynamic dampers, respectively, were solved by proper altering of mold design with process simulation of rubber injection molding.
Study of Hydrodynamics and Reaction Characteristics of K-based Solid Sorbents for
Capture in a Continuous System Composed of Two Bubbling Fluidized-bed Reactors
Kim, Ki-Chan ; Kim, Kwang-Yul ; Park, Young-Cheol ; Jo, Sung-Ho ; Ryu, Ho-Jung ; Yi, Chang-Keun ;
Korean Chemical Engineering Research, volume 48, issue 4, 2010, Pages 499~505
In this study, hydrodynamics and reaction characteristic of K-based solid sorbents for
capture were investigated using a continuous system composed of two bubbling fluidized-bed reactors(1.2 m tall bed with 0.11 m i.d.). Potassium-based dry sorbents manufactured by the Korea Electric Power Research Institute were used, which were composed of
of 35% for
absorption and supporters of 65% for mechanical strength. The continuous system consists of two bubbling fluidized-bed reactors, solid injection nozzle, riser, chiller, analyzer and heater for regeneration reaction. The minimum fluidizing velocity of the continuous system was 0.0088 m/s and the solid circulation rate measured was 10.3 kg/
at 1.05 m/s velocity of the solid injection nozzle. The
concentration of the simulated gas was about 10 vol% in dry basis. Reaction temperature in carbonator and regenerator were maintained about
, respectively. Differential pressures, which were maintained in carbonator and regenerator, were about
, respectively. In order to find out reaction characteristics of dry sorbents, several experiments were performed according to various experimental conditions such as
content(7.28~19.66%) in feed gas, velocity (0.053~0.103 m/s) of simulated gas, temperature(
) of a carbonator, temperature(
) of a regenerator and solid circulation rate(7.0~10.3 kg/
). The respective data of operating variables were saved and analyzed after maintaining one hour in a stable manner. As a result of continuous operation,
removal tended to increase by increasing
content in feed gas, temperature of a regenerator and solid circulation rate and to decrease by increasing temperature of a carbonator and gas velocity in a carbonator.
Enhancement of Conversion Efficiency of Dye-Sensitized Solar Cells(DSSCs) by
Park, Seon-Yeong ; Jung, Su-Kwon ; Kim, Jung-Hyeun ;
Korean Chemical Engineering Research, volume 48, issue 4, 2010, Pages 506~510
Electron recombinations in electrolyte solution reduce light-to-energy conversion efficiency at the nanoporous electrode surface of dye sensitized solar cells. In this study, we improved the conversion efficiency using an energy barrier at the nanoporous electrode surface to control the recombination process. The energy barrier was formed by coating nanoporous
material. We investigated the influence of energy barrier on the cell efficiency depending on the coating thickness. Nanoporous
electrode was coated about 5 nm thickness by 12 times coatings, and so the coating layer was grown about 0.417 nm for every time. Enhancement of conversion efficiency from 2.55% to 4.25% was achieved at 0.834 nm coating thickness, and it was believed as the optimum thickness for minimizing the electron recombination process in our experimental system.
Influence of Perfluorinated Polymer Passivation on AlGaN/GaN High-electron-mobility Transistors
Jang, Soo-Hwan ;
Korean Chemical Engineering Research, volume 48, issue 4, 2010, Pages 511~514
) was deposited on selective area of AlGaN/GaN HEMT structure using low cost and simple spin-coating method, and the electrical characteristics of the device was analyzed for application of passivation layer on semiconductors. Gate lag measurement results of
passivated and unpassivated HEMT were compared. Passivated device shows improved 65 % pulsed drain current of dc mode value. Rf measurements were also performed.
passivated HEMT have similar rf performance to PECVD grown
passivation layer may play an important role in mitigating surface state trapping in the region between gate and drain.
Separation of Tryptophan Enantiomers by using
T HPLC Column
Song, Sung-Moon ; Rang, Moon-Jung ; Kim, In-Ho ;
Korean Chemical Engineering Research, volume 48, issue 4, 2010, Pages 515~518
D,L-tryptophans were separated by using
T HPLC column. Mobile phases were the mixture of methanol and water(70:30, 80:20, 90:10, v/v). Experimental temperatures were adjusted as 25, 40 and
in order to compare retention times. Difference in D,L-tryptophan retention times was studied in terms of the interaction between stationary phase and tryptophans. Selectivity, resolution and efficiency of column were utilized to find an optimum separation condition. Retention times were shortened by increasing the amount of methanol in mobile phase and the temperature of column. The best selectivity and resolution was obtained with the temperature(
) and the ratio of mobilephase(70/30 v/v%).
Measurements and Modeling of the Activity Coefficients and Solubilities of L-alanine in Aqueous Electrolyte Solutions
Lee, Bong-Seop ; Kim, Ki-Chang ;
Korean Chemical Engineering Research, volume 48, issue 4, 2010, Pages 519~533
Activity oefficients and solubilities of L-Alanine in aqueous solutions containing each of four electrolytes(NaCl, KCl,
) were measured at 298.15 K. The measurements of activity coefficients were carried out in the electrochemical cell coupled with two ion-selective electrodes(cation and anion), and the solubilities were measured by the gravimetric analysis of saturated solutions in equilibrium with the solid phase of L-alanine. To model the activity coefficients and solubilities of amino acid in the amino acid/electrolyte aqueous solutions, thermodynamic relations of the residual Helmholtz free energy in the amino acid/electrolyte aqueous solutions were developed based on the perturbed-chain statistical associating fluid theory(PC-SAFT) combined with the primitive mean spherical approximation(primitive-MSA). In the present model, it is assumed that the zwitterions of L-alanine are associated with each other and cross-associated with water molecules, and also cross-associated with the cation and anion dissociated from an electrolyte(inorganic salt). The activity coefficients and solubilities of L-Alanine calculated from the theoretical model proposed in this work are found to be well agreeable with experimental data.
Comparative Study on Adsorptive Removal of Organic Sulfur Compounds over Cu-Exchanged NaY Zeolites
Jung, Gap-Soon ; Lee, Suk-Hee ; Cheon, Jae-Kee ; Park, Dong-Ho ; Woo, Hee-Chul ;
Korean Chemical Engineering Research, volume 48, issue 4, 2010, Pages 534~539
The adsorptive removal of organic sulfur compounds including tert-butylmercaptane(TBM), tetrahydrothiophene(THT) and dimethylsulfide(DMS) in methane was investigated over NaY and copper-exchanged NaY(CuNaY) zeolites at 303 K and atmospheric pressure. In the ternary adsorption system, the preferential adsorption of THT over other sulfur compounds on NaY and the concurrent adsorption of all sulfur compounds on CuNaY were achieved, which could be explained by the breakthrough curve, the temperature-programmed desorption, and the apparent activation energy for desorption. The sulfur uptake capacity of CuNaY(2.90~3.20 mmol/g) was much higher than that of NaY(0.70~0.90 mmol/g). A comparative study indicated that the
sites and acidity of CuNaY were probably responsible for the strong interaction with sulfur atom and high sulfur uptake abilities.
A Study on Removal of
by Low Temperature Plasma
Park, Hei-Jae ; Lee, Nae-Woo ; Choi, Jae-Wook ; Lim, Woo-Sub ;
Korean Chemical Engineering Research, volume 48, issue 4, 2010, Pages 540~543
In this study, we made low temperature plasma reactor in order to treat safely
which included in the gas. We investigated experimently and inspected efficiency characteristics of equipment about flow rate of reactant material and discharge input power which supplied into reactor. As a reaction gas, by using mixture gas of NO/
, we setted up initial NO concentration and supplied the speed of a current to 1~4 l/min. When the amount of flow increased, reduction rate of NO was low. Also when discharge input power was high, decomposition of NO was easy. Also the longer delay time of reaction material and the higher discharge input power was, the higher decomposition energy efficiency was. And when the amount of flow was much, and the more discharge input power increased, the more ozone generated.