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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Applied Chemistry for Engineering
Journal Basic Information
Journal DOI :
The Korean Society of Industrial and Engineering Chemistry
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Volume & Issues
Volume 24, Issue 6 - Dec 2013
Volume 24, Issue 5 - Oct 2013
Volume 24, Issue 4 - Aug 2013
Volume 24, Issue 3 - Jun 2013
Volume 24, Issue 2 - Apr 2013
Volume 24, Issue 1 - Feb 2013
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Biosensor Electrode Manufacturing Technology Using Nano-carbon Materials
Kim, Ji-Hyun ; Bae, Tae-Sung ; Lee, Young-Seak ;
Applied Chemistry for Engineering, volume 24, issue 2, 2013, Pages 113~120
Due to human life expectancy of the recent development of medical technology recently, it leads to increase the desire for improving the quality of human life, and grow health concerns and needs. Therefore, in order to prevent the occurrence of disease and to check up a disease quickly, research on the development of a biosensor has been actively processed. One of them, the nano-carbon materials, are very suitable for manufacturing biosensor due to their excellent electrical/mechanical properties. In this review, we introduced the recent studies about preparation methods of carbon electrodes using the carbon nano-materials for biosensors as well as its technological applications.
Preparation and Electrical Properties of Carbon Paper Using Chopped Carbon Fiber
Lee, Ji-Han ; Yoo, Yoon-Jong ; Park, Soo-Jin ;
Applied Chemistry for Engineering, volume 24, issue 2, 2013, Pages 121~125
In this work, we prepared the carbon paper from chopped carbon fibers using a gas diffusion matrix in polymer electrolyte membrane fuel cells by wet processing. The process of making carbon paper using wet processing is consisted of the three steps involving the dispersion of chopped carbon fibers, the preparation of the carbon fiber web, the impregnating of phenol resin. This work was focused on finding the optimal surfactant to make the carbon paper with 2D orientation of carbon fibers by investigating the dispersion state of carbon fibers in different dispersion solutions. Furthermore, the effect of phenol resin and carbon black contents on properties of electric conductivity was analyzed. As a result, it is confirmed that the carbon fiber was well dispersed when using sodium dodecyl sulfate as a surfactant, and the carbon paper with 8 wt% of phenol and 5 wt% of carbon black contents showed the most excellent electrical property.
Characteristics of BGsome-Coated Illite as a Face Powder
Lim, Jin Kyong ; Jin, Byung Suk ;
Applied Chemistry for Engineering, volume 24, issue 2, 2013, Pages 126~131
BGsome coating on the surface of illite powder was attempted to impart skin affinity and improve various characteristics of the powder for makeup cosmetics. BGsome is a type of hydrated liquid crystalline vesicles prepared by the hydration of 1,3-butylene glycol (BG) dissolved lecithin. BGsome droplets were coated through wet process and the coated powders were analyzed by TGA, SEM, and particle size measurements. Effect of BGsome coating on the physical properties, such as flow-ability, dispersibility, spreadability, and adhesion, were examined. The repose angle of BGsome-coated illite was decreased, which means that BGsome coating improves the flowability of the powder. Dispersibility, spreadability, and adhesion of the coated illite were also improved remarkably. The result of adhesion tests showed that the BGsome-coated illite was evenly adhered onto artificial leather surface with almost no lumps. The flowability, dispersibility, spreadability and adhesion of face powders containing the BGsome-coated illite were also improved.
A Study on Entrapment Efficiency of Rosmarinic Acid Using Liquid Crystal Phosphatidylcholin
Kang, Ki-Chun ;
Applied Chemistry for Engineering, volume 24, issue 2, 2013, Pages 132~137
The liquid crystal form with phosphatidylcholine contents containing in the hydrogenated lecithin was confirmed. Composition ingredients of the liquid crystal vesicle were phospholipid, ethanol and water and the rosmarinic acid was encapsulated as index material. The mean particle size of the liquid crystal vesicle appeared to form various particles form 480 nm to
depending upon the lipid composition and ultrasonic handling time. The liquid crystal vesicle compared with the liposome showed a very high encapsulation efficiency. The quantity of liquid crystal vesicle increased with respect to the increased quantity of lipid contents in the hydrogenated lecithin. The result from release experiments of the liquid crystal vesicle containing rosmarinic acid showed that the liquid crystal vesicle releases much less than that of liposome.
A Study on the Relationship of Change of Mechanical Properties and Carbonyl Index Induced through Short-wavelength Ultraviolet Radiation (254 nm) for High Density Polyethylene
Kim, Chang-Hwan ; Shin, Jin-Yong ;
Applied Chemistry for Engineering, volume 24, issue 2, 2013, Pages 138~143
This paper studied the possibility to predict a mechanical property variation from changes in created carbonyl bands by irradiating the surface of high-density polyethylene with short-wavelength ultraviolet radiation of 254 nm to induce a fast chemical degradation. The meaning of this study lies in checking whether a mechanical property change with the same chemical property as the induced optical deterioration is caused by using a UVC lamp with high photon energy instead of optical deterioration via xenon arc light source and outdoor exposure test via natural sunlight requiring a long time. The mechanical strength of high-density polyethylene checked by a tensile test and a creep destruction test showed a similar tendency with CI changes. In particular, the yield strength and elongation had a close relationship with the exposure time to ultraviolet radiation. Accordingly, this paper presented a method to grasp the mechanical property change outdoors requiring a long time more fast through the relationship between the mechanical property change and the carbonyl index using a UVC lamp causing the fast surface degradation.
The Correlation of Sweating of Oil/wax Structure and Thermal Property
Yun, Seiyoung ; Kim, Jungil ;
Applied Chemistry for Engineering, volume 24, issue 2, 2013, Pages 144~147
Sweating, which is the excretion of oil on the surface of a solid product containing several kinds of pigments in oil and is also solidified with wax, is a unique phenomenon often observed on the surface of cover make-up or lipstick. The cause of sweating is an imbalanced formula. Many studies have been conducted to decrease the symptoms of sweating in the field of cosmetics. Differential scanning calorimetry (DSC) is a thermo-analytical technique that measures the amount of heat required to increase the temperature of a sample as a function of temperature or time under certain conditions. DSC has been used to determine the thermal properties of oil/wax structures. This study investigates how the thermal characteristics correlate with the sweating symptoms. An oil/wax formulation with an optimal melting point was studied in an attempt to make a stable product by considering the thermal properties that represent minimal structural changes with temperature variation. In addition, the sweating of the oil/wax formulation was observed over a various temperature range. As a result, it was found that sweating was minimized when the structure remained static or little bit changed over a variety of temperatures.
Synthesis and Adhesion Properties of UV Curable Acrylic PSAs for Semiconductor Manufacturing Process
Lee, Seon Ho ; Lee, Sang Keon ; Hwang, Taek Sung ;
Applied Chemistry for Engineering, volume 24, issue 2, 2013, Pages 148~154
UV curable acryl resin, pressure-sensitive adhesives (PSAs), are used in many different parts in the world. In particular, PSAs has been used in the wafer manufacturing process of semiconductor industry. As wafers become much thinner, UV curable PSAs require more proper adhesion performance. In this study, acrylic PSAs containing hydroxyl groups were synthesized using monomers of 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, styrene monomer and 2-hydroxyethyl acrylate. Isocyanate modified UV curable PSAs were then prepared by the adduct reaction that facilitates the UV curing property via controlling the amount of methacryloyloxyehtyl isocyanate. The proper adhesion performance and UV curing behavior of UV curable PSAs with various hydroxyl values were studied, and experimental conditions were then optimized to raise the efficiency of wafer manufacturing process. It was found that in case of using the equivalent ratio of 1 : 1 isocyanate hardener used in the UV curable PSAs, the peel strength before the UV curing process decreased as the amount of hydroxyl groups increased in the PSAs. The peeling adhesive strength was also decreased with increasing UV dose due to high curing characteristics.
UV-induced Mutagenesis of Nannochloropsis oculata for the Increase of Lipid Accumulation and its Characterization
Kim, Jong-Hun ; Park, Hyun-Jin ; Kim, Young-Hwa ; Joo, Hyun ; Lee, Sang-Hoon ; Lee, Jae-Hwa ;
Applied Chemistry for Engineering, volume 24, issue 2, 2013, Pages 155~160
Research on mutant generation and isolation for microalgae yielding enhanced lipid accumulation is an important issue for the production of economic biodiesel. In the present study, ultraviolet (UV-B type) ray induced mutant generation was tried using a photosynthetic microalgae, Nannochloropsis oculata (N. oculata), for the production of biodiesel. The resulting colonies were isolated and further cultured with both liquid and solid state f/2 media. After a few week cultivation, changes of cell growth rate, dry cell weight, and several important intracellular components (chlorophyll, carotenoid, and lipid) were investigated. Two mutants among thousands colonies showed an increased cell growth and high lipid accumulation as compared to those of wild type. It was also observed that the increased cell growth rate is associated with the overexpressed intracellular proteins. However, the mutants showed a decrease in the chlorophyll biosynthesis.
A Study on the Charateristics for Ozone Decomposition over Recovered Mn from Spent Betteries
Kim, Geo Jong ; Hong, Sung Chang ;
Applied Chemistry for Engineering, volume 24, issue 2, 2013, Pages 161~164
In this study, the application of recovered metals from spent batteries by extraction was investigated for ozone decomposition as a catalyst. Among the recovered metals, Mn contents was the most important factor for ozone decomposition. It was also found that the deactivation rate of the catalyst was dependent on the Zn contents, while K contents and activities were not perfectly correlated for ozone decomposition. In addition, the catalytic activity the
added catalyst was decreased, due to the reduction of Mn contents. The structural characteristics of maganase oxide was not associated with the catalytic activity for ozone decomposition.
Dispersion Characteristics of Carbon Black Particles in a High Viscous Simulated Solution
Jeong, Kyung-Chai ; Eom, Sung-Ho ; Kim, Yeon-Ku ; Cho, Moon Sung ;
Applied Chemistry for Engineering, volume 24, issue 2, 2013, Pages 165~170
An external gelation method in place of an internal gelation method applied to the fabrication process of an intermediated compound of Uranium Oxy-Carbide (UCO) kernel spheres for Very High Temperature Reactor (VHTR) fuel preparation is under development in Korea. For the preliminary experiments of the UCO kernel sphere preparation using an external gelation method, the carbon black dispersion experiments were carried out using a simulated broth solution. From the selection experiments of various kinds of carbon black through dispersion experiments in a viscous metal salt solution, Cabot G carbon black was selected owing to its dispersion stability, and the homogeneous dispersing state of carbon black particles in our system. For the effective dispersion of nano-size aggregated carbon black particles in a high viscous liquid, the carbon black particles in a metal salt solution were first de-aggregated with ultrasonic force. The mixed solution was then dispersed secondly by the use of the extremely high-speed agitation with a mechanical mixer of 6000 rpm after feeding the Poly Vinyl Alcohol (PVA) in the solution. This results in the broth solution with good stability and homogeneity alongside no further changes in physical properties.
A Study on the Synthesis of Acrylic Phenol Resins and Their Properties as a Paint
Hwang, Sue In ; Kim, Young Jin ; Kim, Dong Kwon ;
Applied Chemistry for Engineering, volume 24, issue 2, 2013, Pages 171~176
The need of volatile organic compound (VOC) free coating material has been increased to solve environmental problems such as the global warming. Nowadays, about 70~80% of coating materials used in the worldwide are a liquid type. Therefore, the development of non-solvent coating material that can minimize VOCs emissions is necessary to solve the global warming problem. In this study, acrylic monomers were added to develop non-solvent paints in order to improve disadvantages of the poor adhesion of a conventional phenolic resin caused by acidification. As a result, the blend resins of 2.818 Mpa phenol- formaldehyde resin/poly methyl methacrylate (PE/PMMA) has the best properties and performances for the adhesives.
Antioxidative Activity and Component Analysis of Broussonetia kazinoki SIEB Extracts
Park, Su Ah ; Ha, Ji Hoon ; Park, Soo Nam ;
Applied Chemistry for Engineering, volume 24, issue 2, 2013, Pages 177~183
In this study, the antioxidative activities and component analysis of Broussonetia kazinoki SIEB (B. kazinoki). extracts were investigated. B. kazinoki extract showed the effective free radical (1,1-diphenyl-2-picrylhydrazyl, DPPH) scavenging activity (
). Reactive oxygen species (ROS) scavenging activity (
) of the ethyl acetate fraction of B. kazinoki. extracts in the luminol-dependent
. The ethyl acetate fraction of B. kazinoki. extracts also exhibited more prominent cellular protective effects (
, 183.3 min at
) than that of typical antioxidant
= 38.00 min) in the
-induced photohemolysis of human erythrocytes. Components of the ethyl acetate fraction obtained from B. kazinoki extracts were analyzed by TLC, HPLC chromatogram, LC/ESI-MS/MS and
-NMR. Consequently, Components, components were identified as the kazinol J of kazinol series and luteolin (2-(3,4-dihydroxyphenyl)-5,7-dihydroxy-4-chromenone) of flavonoid series having antioxidant activities. These results indicate that extract/ fraction of B. kazinoki can be used as antioxidants in biological systems, particularly skins exposed to UV radiation by quenching and/or scavenging
and other ROS, and protecting cellular membranes against ROS. Thus, the extract/fraction of B. kazinoki could be applicable to new cosmeceuticals.
Adsorption Equilibrium, Kinetics and Thermodynamics Studies of Malachite Green Using Granular Activated Carbon
Lee, Jong-Jib ;
Applied Chemistry for Engineering, volume 24, issue 2, 2013, Pages 184~189
In the present study, batch experiments were carried out for the utilizatioin of activated carbon as a potential adsorbent to remove a hazardous malachite green from an aqueous solution. The effects of various parameters such as temperature, contact time, initial concentration on the adsorption system were investigated. On the basis of adsorption data Langmuir and Freundlich adsorption isotherm model were also confirmed. The equilibrium process was described well by Langmuir isotherm model. From determined separation factor, the activated carbon could be employed as an effective treatment for removal of malachite green. From kinetic experiments, the adsorption process followed the pseudo second order model, and the adsorption rate constant (
) decreased with increasing both the initial concentration of malachite green and the adsoprtion temperature. Thermodynamic parameters like that activation energy, change of free energy, enthalpy, and entropy were also calculated to predict the adsorption nature. The activation energy calculated from Arrhenius equation indicated that the adsortpion of malachite green on the zeolite was physical process. The negative Gibbs free energy change (
G = -3.68~-7.76 kJ/mol) and the positive enthalpy change (
H = +26.34 kJ/mol) indicated the spontaneous and endothermic nature of the adsorption in the temperature range of 298~318 K.
Ethosome Formulation for Enhanced Transdermal Delivery of Artemisia princeps Pampanini Extracts
Yang, Hyun Gab ; Kim, Hye Jin ; Kim, Hae Soo ; Park, Soo Nam ;
Applied Chemistry for Engineering, volume 24, issue 2, 2013, Pages 190~195
In our previous studies, the antioxidant, anti-aging, and antibacterial activities of Artemisia princeps Pampnini (A. princeps Pamp.) extract were reported. In this study, ethosome formulations for the enhanced transdermal delivery of A. princeps Pamp. extract were prepared. The particle size, loading efficiency and skin permeation of them were evaluated. The ethosome loaded with 0.06% ethyl acetate fraction of A. princeps Pamp. extract was more stable and maintained the constant particle size for 3 weeks after being prepared. The particle size of ethosome containing 0.06% ethyl acetate fraction was
and the loading efficiency was
. The ethosome formulation exhibited the greater enhancement of skin permeation than of general liposome and 20% ethanol solution in skin permeability experiments.
Study on the Synthesis of the Binder for Antistatic Coating Applicable under High Voltage
Kim, Jae Young ; Yang, Hee Jun ; Pak, Na Young ; Choi, Young Ju ; Lee, Seong Min ; Chung, Dae-Won ;
Applied Chemistry for Engineering, volume 24, issue 2, 2013, Pages 196~200
We conducted investigation on polymeric binders for anti-static coating agent which can maintain stability under the high-voltaic condition. Various polyesters composed of polyethylene glycol (PEG) and polypropylene glycol (PPG) were synthesized and studied in term of the variation in the surface resistance of the film made from coating solution composed of a conductive polymer and these polyesters as a binder. We found that the surface resistance displayed
regardless of chemical composition of binders under the potential of 10 V. Whereas, the surface resistance surged to higher than
when 1000 V was applied, rendering it improper for anti-static purpose. When 1,4 butanediol (BD) was incorporated into polyesters ([PEG]/[PPG]/[BD] = 25.0/67.5/7.5), the surface resistance showed
under 1000 V, acceptable for anti-static application. These observations may indicate that the hydrophobic nature of BD makes a significant contribution to the surface resistance at a high positive potential.
Effect of Boric Acid Treatment on the Electrochemical Properties of the Phenol-Based Activated Carbon
Jung, Min-Jung ; Yu, Hye-Ryeon ; Lee, Dayoung ; Lee, Young-Seak ;
Applied Chemistry for Engineering, volume 24, issue 2, 2013, Pages 201~207
In this study, the surface of a phenol based activated carbon (AC) used as an electrode in an electric double layer capacitor was modified via boric acid treatment for the capacitance investigation. The effect of boric acid treatment on electrochemical performance was also investigated. The AC surface functional groups ratio of quinone-like (O=C) which is electrochemical active functional groups was increased after the boric acid treatment. And, boric acid treated AC showed an increase in the specific surface area, total pore volume, and micropore volume. In case of optimum boric acid treated AC, its specific capacitance increased by 20% in comparison to that of untreated AC. These results demonstrate that a boric acid treated carbon surface-based electric double layer capacitor electrode effectively enhances specific capacitance.
Effect of Flame Retardants on Flame Retardancy of Flexible Polyurethane Foam
Kwon, Ohdeok ; Lee, Ju-Chan ; Seo, Ki-Seog ; Seo, Chung-Seok ; Kim, Sang Bum ;
Applied Chemistry for Engineering, volume 24, issue 2, 2013, Pages 208~213
In this study, the effect of phosphorus flame retardants on the flame retardancy of the flexible polyurethane foam (PUF) was investigated. Tetramethylene bis(orthophosphorylurea) [TBPU] and phosphinyl alkylphosphate ester [CR-530], resorcinol bis diphenylphosphate [RDP], triethyl phosphate [TEP] were used as flame retardants. The results of thermogravimetric analysis (TGA) indicate that TBPU added PUF produces more charred residues than the other flame retardant added PUF. It was found that TBPU added PUF exhibits low mean heat release rate (HRR), peak HRR, effective heat of combusion (EHC), mass loss rate (MLR), CO yield and
compared to those other flame retardants.
Study on the Physical and Rheological Properties of Nylon66/MWCNT Composites
Kim, Do Eui ; Kim, Youn Cheol ;
Applied Chemistry for Engineering, volume 24, issue 2, 2013, Pages 214~218
Nylon66/multi-walled carbon nano tube (MWCNT) composites were fabricated by twin screw extruder. The contents of MWCNT were 1, 3, 5, and 7 wt%. Thermal properties, dispersion, rheological and impact properties were measured by DSC, TGA, X-ray diffraction (XRD), SEM, Dynamic rheometer, and Izod impact tester. The effect of MWCNT on the non-isothermal crystallization of Nylon66 was confirmed by DSC. The complex viscosity at low frequency and the shear thinning tendency of the composites increased with MWCNT content. An increase in the elasticity was confirmed from the decrease in the slop of G'-G" plot. Izod impact strengths of the composites were analyzed as a measure of mechanical properties, which indicated that the composites exhibit a 60% enhancement for the impact strength when 3 wt% MWCNT was added. The dispersion of MWCNT within Nylon66/MWCNT composites was also checked by SEM.