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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Applied Chemistry for Engineering
Journal Basic Information
Journal DOI :
The Korean Society of Industrial and Engineering Chemistry
Editor in Chief :
Volume & Issues
Volume 23, Issue 6 - Dec 2012
Volume 23, Issue 5 - Oct 2012
Volume 23, Issue 4 - Aug 2012
Volume 23, Issue 3 - Jun 2012
Volume 23, Issue 2 - Apr 2012
Volume 23, Issue 1 - Feb 2012
Selecting the target year
Antimicrobial Peptide as a Novel Antibiotic for Multi-Drug Resistance "Super-bacteria"
Park, Seong-Cheol ; Nah, Jae-Woon ;
Applied Chemistry for Engineering, volume 23, issue 5, 2012, Pages 429~432
According to the requirement of novel antimicrobial agents for the rapidly increasing emergence of multi-drug resistant pathogenic microbes, a number of researchers have found new antibiotics to overcome this resistance. Among them, antimicrobial peptides (AMPs) are host defense molecules found in a wide variety of invertebrate, plant, and animal species, and are promising to new antimicrobial candidates in pharmatherapeutic fields. Therefore, this review introduces the antimicrobial action of antimicrobial peptide and ongoing development as a pharmetherapeutic agent.
Synthesis and Characterization of Interfacial Properties of a Cationic Surfactant Having Three Hydroxyl Groups
Lee, Byung Min ; Kim, Ji-Hyun ; Kim, Sung Soo ; Lim, Jong Choo ;
Applied Chemistry for Engineering, volume 23, issue 5, 2012, Pages 433~439
In this study, a cationic surfactant BHMAS (N,N-bis-(3'-n-dodecyloxy-2'-hydroxypropyl)-N-methyl-2-hydroxyethylammonium methyl sulfate) having two lauryl and three hydroxyl groups was synthesized by the reaction of n-dodecyl glycidyl ether and 2-aminoethanol followed by the quarternization with dimethyl sulfate. The structure of the product was elucidated by
and FT-IR. The CMC (critical micelle concentration) and surface tension of BHMAS at CMC condition were found to be
mol/L and 28.71 mN/m respectively. Dynamic surface tension measurements using a maximum bubble pressure tensiometer indicated that a relatively long time was required to saturate the interface between air and aqueous surfactant solution. The interfacial tension measured between 1 wt% surfactant solution and n-decane reached an equilibrium value of 0.045 mN/m in 5 min. The adsorption capacity of the synthesized surfactant was observed to be excellent, which suggests that the surfactant can be used as a softening agent during a laundry process.
A Study on Pyrolysis Characterization and Heating Value of Semi-carbonized Wood Chip
Kim, Ki-Seok ; Choi, Eun-A ; Ryu, Jeong-Seok ; Lee, Yong Pyo ; Park, Jong-Yeon ; Choi, Seung-Ho ; Park, Soo-Jin ;
Applied Chemistry for Engineering, volume 23, issue 5, 2012, Pages 440~444
In this work, a semi-carbonized wood chip (SC-WC) was prepared by heat-treatment at low carbonization temperature. The pyrolysis characterization and heating value of the SC-WC at different heat-treatment temperature were evaluated. The pyrolysis characterization and heating value of the SC-WC were determined using thermal gravimetric analyzer (TGA) in
atmosphere and calorimeter, respectively. From the TGA results, the thermal decomposition reaction of the SC-WC treated at by low temperature was similar to pure wood chip and the reaction was most actively occurred in the range of
, whereas the initial thermal decomposition temperature of the SC-WC increased with the increasing heat-treatment temperature. In addition, the heating value of the SC-WC showed a similar trend as to the decamposition temperature behavior. This is probably attributed to increased carbon content of SC-WC by the localized carbonization of the wood chip which consisted of cellulose, hemi-cellulose, and lignin.
Application of CV Cycling to the Activation of the Polymer Electrolyte Membrane Fuel Cell
Cho, Ki-Yun ; Jung, Ho-Young ;
Applied Chemistry for Engineering, volume 23, issue 5, 2012, Pages 445~449
The activation process of the membrane-electrode assembly (MEA) is important for the mass production of the polymer electrolyte membrane fuel cell. The conventional activation process for the MEA requires excessive time and hydrogen gas and it might become the barrier for the commercialization of the fuel cell. The conventional activation process is based on hydrolysis of ion conducting membrane. In the study, we suggest the cyclic voltammetry (CV) technique as an on-line activation process and the CV activation process consists of two steps : 1) the humidification of the polymer electrolyte membrane and the electrode with 100% RH humidified nitrogen (
) gas, and 2) the removal step of the oxide layer on the surface of the Pt catalyst with CV cycling. The cycling reduces the activation time of the MEA by 2.5 h and use of hydrogen gas by 1/4.
Study of Equilibrium, Kinetic and Thermodynamic Parameters about Fluorescein Dye Adsorbed onto Activated Carbon
Lee, Jong-Jib ; Um, Myeong Heon ;
Applied Chemistry for Engineering, volume 23, issue 5, 2012, Pages 450~455
The paper includes the utlization of an activated carbon as a potential adsorbent to remove a hazardous fluorescein dye from an aqueous solution. Batch adsorption experiments were carried out for the removal of fluorescein dyes using a granular activated carbon as an adsorbent. The effects of various parameters such as pH, amount of adsorbent, contact time, initial concentration and temperature of the adsoprtion system were investigated. The experimental results revealed that activated carbon exhibit high efficiencies to remove fluorescein dyes from the aqueous solution. The equilibrium process can be well described by Freundlich isotherm in the temperature range from 298 K to 318 K. From adsorption kinetic experiments, the adsorption process followed a pseudo second order kinetic model, and the adsorption rate constant (
) decreased with increasing the initial concentration of fluorescein. The free energy of adsorption
), and entropy (
) change were calculated to predict the nature adsorption. The estimated values for
were -17.11~-20.50 kJ/mol over an activated carbon at 250 mg/L, indicated toward a spontaneous process. The positve value for
, 33.2 kJ/mol, indicates that the adsorption of fluorescein dyes on an activated carbon is an endothermic process.
Combustion Chracteristics of Biomass and Refuse Derived Fuel
Gu, Jae-Hoi ; Oh, Sea Cheon ;
Applied Chemistry for Engineering, volume 23, issue 5, 2012, Pages 456~461
To verify the utilization of biomass as energy, the combustion characteristic has been studied by an experimental combustion furnace under an isothermal and non-isothermal combustion. The wood pellet, rice straw and rice husk were used as biomass samples in this work. The characteristics of emission gases, dusts and residues from biomass combustion have been analyzed and compared with those of reuse derived fuel (RDF). From isothermal combustion experiments, it was found that the incomplete combustion of rice straw was greater that that of rice husk, wood pellet and RDF. This is due to the fact that the combustion reaction rate of the rice straw was faster than that of other samples, and the oxygen concentration in rice straw combustion was rapidly decreasing. It was also found that
concentration of emission gas from wood pellet combustion was the lowest. From non-isothermal combustion experiments, it was found that all samples were burned before
. Also, the temperature range of
emission was similar to that of CO emission, on the other hand,
was emitted at a higher temperature than that of CO emission.
Preparation and Characterizations of Complex Composed of
-Cyclodextrin Polymer/Cinnamic Acid
Mok, Eun Young ; Cha, Hyun Ju ; Kim, Jin-Chul ;
Applied Chemistry for Engineering, volume 23, issue 5, 2012, Pages 462~466
-CD) polymers were prepared in a strong alkali condition solution (NaOH solution 30% (w/v)) using epichlorohydrin (EPI) as a cross-linker, and the molar ratio of EPI to
-CD was 10 : 1. The
-CD content in
-CD polymers is about 52%. In order to get the photo-responsible and pH-responsible, cinnamic acid was added to be inserted into the cavities of
-CD due to the hydrophobic interaction. The complex formation was confirmed using transmission electron microscope. The dimerization degree of complexes increased under UV irradiation at
= 365 nm but decreased under the UV irradiation at
= 254 nm. Dynamic light scattering analysis of particle sizes showed that the sizes of complexes did not change with different UV wavelength. Moreover, the complexes were pH-responsible because of the carboxyl group of cinnamic acid, but the size and zeta potential of the complex did not change in strong acid and alkali conditions.
Formation and Stability of Nanoemulsion Containing CoQ10 by Mechanical Emulsification
Yoo, In-Sang ;
Applied Chemistry for Engineering, volume 23, issue 5, 2012, Pages 467~473
Coenzyme Q10 (CoQ10) is a natural lipid cofactor with antioxidant and anti-aging properties as cosmetic and food ingredients, involved in cellular energy metabolism. Here, nano-emulsions with CoQ10 were fabricated with lecithin, ethanol, oil, and sorbitan monostearate (Arlacel 60), as major components. Phase inversion emulsion method with ultrasonicator was utilized in producing CoQ10 solution, and stabilization effects from lecithin and ethanol and other diverse perturbation factors were evaluated over time. Physical properties of the emulsion were characterized such as its size, surface charges by zeta-potential, and the overall structures. Optimal concentrations of CoQ10 and Arlacel 60 were 0.8% and 3%, respectively, for producing the smallest sizes of nanoemersions in a 100 nm diameter with best morphology. No notable changes in the size were observed over 7 days from Ostwald ripening, when the concentration of Arlacel 60 was higher than 2%. Even after 270 days at room temperature, the size of nanoemulsions maintained as 115 nm in diameter, revealing only a 10% increase with high degrees of long termed stability and substantiality. In addition, changes in the surface potential occurred possible due to the flocculation effect on the nanoparticles.
Selective Removal of Calcium Ions from a Mixed Solution using Membrane Capacitive Seionization System
Kim, Yu-Jin ; Choi, Jae-Hwan ;
Applied Chemistry for Engineering, volume 23, issue 5, 2012, Pages 474~479
Possibility of the selective removal of
ions from a mixed solution of
ions using membrane capacitive deionization (MCDI) was investigated. Adsorption equilibrium experiments were conducted to determine the selectivity of the CMX cation-exchange membrane toward
ions. In addition, desalination experiments for a mixed solution (5 meq/L NaCl + 2 meq/L
) were performed using an MCDI cell. The adsorption equilibrium of CMX membrane showed that the equivalent fraction of
ions in the solution and the CMX membrane were 28.6 and 87.2%, respectively, which indicates the CMX membrane's high selectivity toward
ions. Desalination experiments were performed by applying a constant current to the MCDI cell until the cell potential reached 1.0 V. The amount of ions adsorbed did not significantly change as the applied current was changed. However, the equivalent fractions of
ions among the adsorbed ions were inversely proportional to the applied currents: 81.4, 78.4, 77.0, and 74.5% at 200, 300, 500, and
of applied current density, respectively. This result is attributed to the increased fraction of
ions adsorbed by the CMX membrane at lower applied current densities.
Study on Anti-Washout Properties and Shear-Thickening Behaviors of Surfactant Added Cement Grouts
Jang, In-Kyu ; Seo, Seung-Ree ; Park, Seung-Kyu ;
Applied Chemistry for Engineering, volume 23, issue 5, 2012, Pages 480~484
Concrete, the mixture of cement, sand, gravel and water, is a suspension substance extensively used to construct building materials. When a concrete mortar is applied to the underwater construction, the rheology of concrete is of great importance to its flow performance, placement, anti-washout and consolidation. In this research, the anti-washout and rheological properties of concrete have been investigated with concrete admixtures prepared by adding anionic surfactants, cationic surfactants, and polymeric thickeners. The concrete mortar formulated by pseudo-polymeric systems with the electrostatic association of anionic and cationic surfactants, showed high viscosities and suitable anti-washout properties, but poor pumpabilities. The addition of poly methyl vinyl ether to the mixed surfactant system exhibits synergistic effects by improving the concrete mortar properties of the concrete mortar such as fluidity, visco-elastic property, self-leveling, and anti-washout.
Effect of Vanadium Oxide Loading on SCR Activity and
Commercial De-NOx Catalysts
Park, Kwang Hee ; Cha, Wang Seog ;
Applied Chemistry for Engineering, volume 23, issue 5, 2012, Pages 485~489
We investigated vanadium (V) loading effects on selective catalytic reduction (SCR) activity and
resistance using commercial SCR catalysts applied on a power plant and incinerator with different amounts of V loading. These catalysts were characterized using XRD, Raman, ICP, BET analysis and found to contain
. The SCR activity of the catalysts increased by increasing either the
loading amounts; the SCR activity of the catalysts added
is higher than that of
-free catalysts. As the V loading amount in the catalyst increased, the
durability decreased. The
inhibits the deactivation process by
resistance of catalysts added
is higher than that of catalysts added
A Study on the Decomposition of Dissolved Ozone and Phenol using Ozone/Activated Carbon Process
Choi, Jae Won ; Lee, Hak Sung ;
Applied Chemistry for Engineering, volume 23, issue 5, 2012, Pages 490~495
The catalytic effect induced by activated carbon (AC) was evaluated during the phenol treatment using an ozone/AC (
) process. In the case of the addition of AC to the ozone only process, the decomposition efficiency of dissolved ozone and phenol increased with increasing the amount of AC input. It was that the OH radical generated from the decomposition of dissolved ozone by AC had an effect on the removal of phenol. It was shown as the catalytic effect of AC ([
) in this study. The maximum catalytic effect was approximately 2.13 under 10~40 g/L of AC input. It approached to the maximum catalytic effect after 40 min of reaction with 10 and 20 g/L of AC input, while the reaction time reached to the maximum catalytic effect under 30 and 40 g/L of AC input was approximately 20 min. Moreover, the removal ratios of total organic carbon (TOC) for ozone only process and ozone/AC process were 0.23 and 0.63 respectively.
Characterization of Arthrospira platensis Mutants Generated by UV-B Irradiation
Park, Hyun-Jin ; Kim, Young-Hwa ; Lee, Jae-Hwa ;
Applied Chemistry for Engineering, volume 23, issue 5, 2012, Pages 496~500
Arthrospira platensis (A. platensis) is an economically important filamentous microalgae. The isolation of mutants by chemical or physical mutagen is a clue for the strain improvement. In this study, effects of ultraviolet-B (UV-B) radiation on A. platensis were investigated. Cells (or microalgae) were exposed to UV-B (15 Watt, 254 nm) for 1, 3, 5, and 10 min, and resulting mutants were designated UM1, UM3, UM5, and UM10, respectively. Especially, the lipid content of UM5 mutant was considerably increased by 8~11 fold compared to that of wild types. Moreover, the carotenoid content and antioxidant enzyme (peroxidase and superoxide dismutase) activity were increased. It was shown that UV-induced mutants can accumulate bioactive compounds, which will be useful for the industrial production of valuable products.
Controllable Patterning of an Al Surface by a PDMS Stamp
Park, Gayun ; Kim, Kyungmin ; Lee, Hoyeon ; Park, Changhyun ; Kim, Youngmin ; Tak, Yongsug ; Choi, Jinsub ;
Applied Chemistry for Engineering, volume 23, issue 5, 2012, Pages 501~504
In this study, etched Al electrodes with ordered arrays of pits and high aspect ratios were successively obtained using a patterned protect layer on the Al surface prepared with soft lithography method. Various methods were applied to fabricate a well ordered protect layer on the Al surface and the difference of etched Al surfaces with and without a protect layer was investigated by using SEM. It was found that the etched Al surfaces were affected by using either a protect layer or a non protect layer. As a result, the Al surface with the well ordered pits could be achieved by protect layer. However, the etched Al with nonuniform pits can be obtained without any protect layers.
Use of Carbon Nanotube Electrode and Squarewave Anodic Stripping Voltammetry for the Detection of Lead Heavy Metal
Choi, Changkun ; Seok, Jonghyuk ; Kwon, Yongchai ;
Applied Chemistry for Engineering, volume 23, issue 5, 2012, Pages 505~509
In this study, we investigate the use of new carbon nanotube paste electrode (CNPE) for promoting the detection of lead (Pb) heavy metal in the a drinkable water, which negatively affects human brain and nerve system. For the evaluations, CNPE is served as a working electrode, while sensitivity and limit of detection (LOD) of Pb are measured in DI and tap water based electrolytes using squarewave anodic stripping voltammetry (SWASV). As a result of that, in the 25~150 ppb range of
ions, its sensitivity and calculated LOD are
and 26 ppb in DI water based 0.1 M
electrolyte while they are
and 38 ppb electrolytes respectively. In addition, experimentally measured LOD values of Pb are 4 ppb and 10 ppb in the two water electrolytes. The stripping of
ion is also controlled by surface reaction. Our experimental data are then compared with those of other already published references. With the comparison, it is proved that our electrode outperforms other electrodes in terms of the sensitivity and LOD of trace Pb metal.
Effect of the Cation Part of Imidazolium Ionic Liquids on Synthesis of Palladium Particle
Kim, Chang Soo ; Ahn, Byoung Sung ; Tae, Hyunman ; Jeon, Seung Hye ; Yoo, Kye Sang ;
Applied Chemistry for Engineering, volume 23, issue 5, 2012, Pages 510~513
Palladium particles were synthesized by conventional chemical reduction method with ionic liquids. The size and shape of palladium particles were significantly affected by the cation parts of ionic liquids. This is mainly attributed to the different stabilities of the ionic liquid structure formed by the physical bond between the cation parts. Among ionic liquids with [
] as an anion part, the hexyl substituent in the cation parts was more effective to synthesize palladium particles with the smaller size and more uniform shape.