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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
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Volume & Issues
Volume 26, Issue 6 - Dec 2015
Volume 26, Issue 5 - Oct 2015
Volume 26, Issue 4 - Aug 2015
Volume 26, Issue 3 - Jun 2015
Volume 26, Issue 2 - Apr 2015
Volume 26, Issue 1 - Feb 2015
Selecting the target year
Research Trends in Ion Exchange Membrane Processes and Practical Applications
Kim, Deuk Ju ; Jeong, Moon Ki ; Nam, Sang Yong ;
Applied Chemistry for Engineering, volume 26, issue 1, 2015, Pages 1~16
DOI : 10.14478/ace.2015.1008
In this review, we summarized some of membrane processes using the ion exchange membrane typically used in energy applications. Ion exchange membranes are classified according to their functions, formations (e.g. heterogeneous, homogeneous), and polymer type. Furthermore, various methods to prepare cation exchange membranes and anion exchange membranes were discussed in detail and also illustrated through a thorough review of the literature works. There are numerous reports highlighting recent research trends in the ion exchange membrane fabrication, however, in this review we will focus more on discussing the development made in ion exchange membranes and their potential usages in future technologies.
Liquid-phase Microextraction Pretreatment Techniques for Analysis of Chemical Warfare Agents and Their Degradation Byproducts in Environmental Aqueous Samples
Kim, Dongwook ; Chung, Wooyoung ; Kye, Youngsik ;
Applied Chemistry for Engineering, volume 26, issue 1, 2015, Pages 17~22
DOI : 10.14478/ace.2015.1010
International interests in chemical warfare agents (CWAs) have been increased recently because of the use of sarin (GB) in Syrian civil war which caused around 1,300 casualties in 2013. After exposing to natural environments, CWAs undergo hydrolysis or photodegrade to non-toxic degradation byproducts. Generally, CWAs and their degradation byproducts are present at very low concentration (e.g. several ppb), thus pretreatment processes including separation, extraction and concentration are required prior to any analyses. Liquid-liquid extraction and solid-phase extraction (SPE) are common techniques to pretreat environmental samples. Recently, a novel pretreatment method, liquid phase miecoextraction (LPME), has been applied to CWAs analysis, which could reduce amounts of solvent used but promote analytical efficiencies. Fundamental backgrounds of LPME and its application to CWAs analysis were reviewed.
Properties of LDPE Composite Films Using Polyurushiol (YPUOH) for Functional Packaging Applications
Jung, Suyeon ; Kim, Dowan ; Seo, Jongchul ;
Applied Chemistry for Engineering, volume 26, issue 1, 2015, Pages 23~28
DOI : 10.14478/ace.2014.1088
Lacquer sap extracted from lacquer trees exhibits good thermal stabilities and antimicrobial properties. To apply these superior properties to functional packaging, polyurushiol (YPUOH) powders were prepared and blended into LDPE (low density polyethylene) to prepare three different LDPE/YPUOH composite films via a twin screw extruder system. Their morphology, thermal and antimicrobial properties as well as barrier properties of the LDPE/YPUOH composite films were thoroughly investigated to find out applicablities of the films as functional packaging materials. Although the interfacial interaction between LDPE and YPUOH was relatively weak, LDPE/YPUOH composite films exhibited good dispersion of YPUOH in LDPE, resulting in the enhanced thermal stability with YPUOH loading. Due to the good antibacterial property of as-prepared YPUOH, LDPE/YUOH composite films also showed an excellent antibacterial activity (R) of 99.9% against E. coli. Furthermore, the moisture barrier property of LDPE/YPUOH composite films increased with increasing YPUOH contents. Incorporating the relatively low amount of YPUOH in LDPE resulted in the apparent enhancement in thermal stabilities, antibacterial and moisture barrier properties, which made them promising candidates as a functional filler for packaging materials.
Synthesis and Antioxidative Activities of N,N'-Diferuloyl-putrescine (DFP) and Its Derivatives
Hwang, Jun Pil ; Ha, Ji Hoon ; Kim, Myung Kyoo ; Park, Soo Nam ;
Applied Chemistry for Engineering, volume 26, issue 1, 2015, Pages 29~34
DOI : 10.14478/ace.2014.1093
N,N'-Diferuloyl-putrescine (DFP) present in plants such as Sophora japonica has been reported to have skin depigmentative and antioxidative activities. In this study, DFP, usually presents in nature a very little amount and its derivative (DFP-D) were synthesized in a large quantity for the use as functional cosmetical materials. The antioxidative activities of synthesized DFP and DFP-D were evaluated by the 1,1-diphenyl-2-picrylhydrazyl (DPPH) assay, chemiluminescence assay, and cell protective effect induced by
, stress. DFP and DFP-D showed DPPH radical scavenging activities (
, respectively. ROS (reactive oxygen species) scavenging activities (
) in the
system of DFP and DFP-D were 2 times (
) and 13 times (
), respectively higher than that of L-ascorbic acid.
, one of ROS playing a key role in the skin photo-aging, induces cellular membrane damages. DFP-D (
) showed good cell protective effects (
) about 2 times more than that of (+)-
). These results suggest that the great antioxidative activities of DFP and DFP-D could be applied to cosmetic industries as functional cosmetic materials.
Effect of the Addition of Propanol to PVC Solution on the Structure of Thin Film and its Surface Property
Park, Jae Nam ; Shin, Young Sik ; Lee, Won Gyu ;
Applied Chemistry for Engineering, volume 26, issue 1, 2015, Pages 35~39
DOI : 10.14478/ace.2014.1095
Polyvinylchloride (PVC) thin films having a microporous structure could be prepared by using the solubility difference in solvents. PVC thin film with a water contact angle of
or more was obtained from the PVC solution consisting of the mixture of tetrahydrofuran as a solvent and propanol as a non-solvent. In the drying process of dip-coated PVC film, the increase of drying temperature reduced the tendency of roughened surface, which led the decrease of surface hydrophobicity. As the addition of propanol in the solution with 1 wt% PVC increased, the uniformity of surface roughness was improved. In the case of oxygen plasma treatments, even though the surface structure of PVC thin film was not notably changed, the surface property of the film was changed from the super-hydrophobicity to hydrophilicity as a function of the plasma exposing time.
Preparation and Characterization of Functional Microcapsules Containing Suspensions of Conducting Materials
Ihm, DaeWoo ; Kwon, Won Ho ;
Applied Chemistry for Engineering, volume 26, issue 1, 2015, Pages 40~46
DOI : 10.14478/ace.2014.1112
Microcapsules containing the suspension of conducting materials such as carbon nanotube (CNT) or polyaniline (PANI) were prepared by in-situ polymerization of melamine and formaldehyde. Stable microcapsules were prepared and the mean diameter of the observed microcapsules was in the range of
. The surface morphology and chemical structure of microcapsules were investigated using optical microscope (OM), scanning electron microscope (SEM), and Fourier transform infrared spectroscopy (FT-IR). The thermal properties of samples were investigated by thermogravimetric analysis (TGA). The conductivity of ruptured microcapsule containing the suspension of CNTs or PANIs in tetrachloroethylene and Isopar-G was measured. As the amount of CNTs and PANIs in the core of microcapsules increased, the measured current increased. Conductivity measurement results suggest that poly (melamine-formaldehyde) based core-shell microcapsules could be applied to self-healing electronic materials systems, where CNTs or PANIs bridge a broken circuit upon release.
Effects of the Graphene Oxide on Glucose Oxidase Immobilization Capabilities and Sensitivities of Carbon Nanotube-based Glucose Biosensor Electrodes
Park, Mi-Seon ; Kim, Do Young ; Jung, Min-Jung ; Lee, Young-Seak ;
Applied Chemistry for Engineering, volume 26, issue 1, 2015, Pages 47~52
DOI : 10.14478/ace.2014.1114
To improve both the GOD immobilization capability and sensitivity of MWCNTs-based biosensor electrode, the electrode was prepared by adding different quantities of GO. The addition of GO increased hydrophilicity and the surface free energy of electrodes for glucose sensing as well as the dispersion of MWCNTs. In addition, the GOD immobilization capability was enhanced and the sensitivity was improved up to
even though having a high
value (0.105) when adding 0.05 g GO to 0.05 g MWCNTs. These experimental results were attributed to the fact that the improvement in dispersion stability for MWCNTs, hydrophilicity, and surface free energy of electrode surface due to the addition of GO affected GOD immobilization capability.
Effects of the Degree of GO Reduction on PC-GO Chemical Reactions and Physical Properties
Park, Ju Young ; Shin, Jin Hwan ; Kim, Youn Cheol ;
Applied Chemistry for Engineering, volume 26, issue 1, 2015, Pages 53~58
DOI : 10.14478/ace.2014.1116
Polycarbonate (PC)/graphene oxide (GO) composites with 3 phr of GO were prepared by using a twin screw extruder at 240, 260, and
after mixing the solution with chloroform. It was confirmed by DSC and TGA that the glass transition temperature (
) of PC/GO composites were not changed and the thermal stability was the best in case of the extrusion temperature at
. Thermo mechanical properties of PC/GO composites according to extrusion temperatures were measured by dynamic mechanical analysis (DMA). Storage moduli of PC/GO composites were higher than that of pure PC and there was no detectable changes at varying the extrusion temperature. Based on these results, the extrusion temperature of PC/GO composites was fixed at
. The degree of the chemical reaction of PC/GO composites with respect to the GO reduction time was confirmed by the C-H stretching peak at
and the degree of the chemical reaction was similar to that of GO when the reduction time was 1 h. A decrease in the complex viscosity as a function of the GO reduction time was detected by dynamic rheometer, which may be originated from the enhancement of GO dispersion by PC-GO reaction. The GO dispersion was confirmed by scanning electron microscope (SEM).
Preparation of Flexible and Light Thermal Insulating Ceramic Composites Using Foaming Technology
Lee, Chul-Tae ;
Applied Chemistry for Engineering, volume 26, issue 1, 2015, Pages 59~66
DOI : 10.14478/ace.2014.1115
A new concept of an inorganic foaming process at low temperature was demonstrated for the production of inorganic thermal insulating materials with the properties of flexible light-weight, the advantages of organic-based thermal insulation material. The foaming process was proceeded by establishing a skeleton of the foam body by using inorganic fibrous sepiolite and aluminum silicate. A cavity was formed by the expansion of fibrous skeleton body, by the gas which was generated from foaming agent at low temperature. Then the multi-vesicular expanded perlite with low thermal conductivity was filled into the cavity in a skeleton of the foam body. Finally through these overall process, a new inorganic foamed body could be obtained at low temperature without the hot melting of inorganic materials. In order to achieve this object, various preparations such as fibrous sepiolite fibrillation process, heat treatment process of the fibrous slurry were needed, and the optimal compositional condition of slurry was required. The foam body produced showed the properties of flexible light-weight thermal insulation materials such as bulk density, yield strength, flexural strength, and high heat resistance.
Numerical Studies of Flow Characteristics and Particle Residence Time in a Taylor Reactor
Lee, Hyeon Kwon ; Lee, Sang Gun ; Jeon, Dong Hyup ;
Applied Chemistry for Engineering, volume 26, issue 1, 2015, Pages 67~73
DOI : 10.14478/ace.2014.1117
Using a computational fluid dynamics technique, the flow characteristics and particle residence time in a Taylor reactor were studied. Since flow characteristics in a Taylor reactor are dependent on the operating conditions, effects of the inlet flow velocity and reactor rotational speed were investigated. In addition, the particle residence time of
(NMC), which is a cathode material in lithium-ion battery, is estimated in the Taylor vortex flow (TVF) region. Without considering the complex chemical reaction at the inlet, the effect of Taylor flow was studied. The results show that the particle residence time increases as the rotating speed increased and the flow rate decreased.
Eco-friend Synthesis of Isoindoline Yellow Compound and its Properties
Kim, Song Hyuk ; Kim, Jae Hwan ; Yang, Seok Won ; Lee, Won-Ki ; Lee, Gun-Dae ; Park, Seong Soo ;
Applied Chemistry for Engineering, volume 26, issue 1, 2015, Pages 74~79
DOI : 10.14478/ace.2014.1118
In this study, to obtain isoindoline compounds with the high thermal resistance and reddish yellow color using an environmental friendly method without the use of any surfactants, isoindoline derivatives with different structures were added at various reaction temperatures for the synthesis and the product was then crystallized by controlling temperatures and times in autoclave. Chemical structures, particle sizes, color differences, and optical properties were evaluated by the means of FT-IR, FE-SEM, UV-Vis spectroscopy, PSA (particle size analyzer) and Zeta potential analyzer. The samples with an enhanced dispersibility, highly thermal resistance, uniform particle sizes were achieved possibly due to the addition of isoindoline derivatives into the crystallization processing mixtures. The color change trend was also observed depending upon synthesis conditions.
Electrochemical Characteristics of Silicon/Carbon Composites for Anode Materials of Lithium Ion Batteries
Park, Ji Yong ; Jung, Min Zy ; Lee, Jong Dae ;
Applied Chemistry for Engineering, volume 26, issue 1, 2015, Pages 80~85
DOI : 10.14478/ace.2014.1119
Silicon/carbon composites as anode materials for lithium-ion batteries were examined to find the cycle performance and capacity. Silicon/carbon composites were prepared by a two-step method, including the magnesiothermic reduction of SBA-15 (Santa Barbara Amorphous material No. 15) and carbonization of phenol resin. The electrochemical behaviors of lithium ion batteries were characterized by charge/discharge, cycle, cyclic voltammetry and impedance tests. The improved electrochemical performance attributed to the fact that silicon/carbon composites suppress the volume expansion of the silicon particles and enhance the conductivity of silicon/carbon composites (30 ohm) compared to that of using the pure silicon (235 ohm). The anode electrode of silicon/carbon composites showed the high capacity approaching 1,348 mAh/g and the capacity retention ratio of 76% after 50 cycles.
Synthesis of Phospholene Oxide Catalysts for Hydrolysis Stabilizers
Lee, Jin-Ha ; Lee, Chang-Young ;
Applied Chemistry for Engineering, volume 26, issue 1, 2015, Pages 86~91
DOI : 10.14478/ace.2014.1124
The MPPO (3-methyl-1-phenyl-2-phospholene-1-oxide) was prepared by using various polymerization inhibitors such as BHT (2,6-di-tert-butyl-4-methylphenol), TBC (4-tert-butylcatechol), and copper stearate. The MPPO was confirmed by the analysis using FTIR,
-NMR, and GC/MS regardless of the type of inhibitors. The yield of MPPO increased with the increase of reaction time, whereas the purity of MPPO decreased slightly. The yield and purity of MPPO increased with temperature, but the MPPO prepared by using copper stearate as a polymerization inhibitor exhibited no changes in the purity. The amount of inhibitors had no effect on the yield of MPPO. The purity of MPPOs increased with the amount of inhibitors, but the MPPO prepared by using BHT showed no changes of the purity. We found that the MPPO prepared by using copper stearate exhibited the highest catalytic activity for diphenylcarbodiimide synthesis.
Effects of the Fluorination of Activated Carbons on the Chromium Ion Adsorption
Kim, Min-Ji ; Jung, Min-Jung ; Choi, Suk Soon ; Lee, Young-Seak ;
Applied Chemistry for Engineering, volume 26, issue 1, 2015, Pages 92~98
DOI : 10.14478/ace.2014.1126
In this study, phenol-based activated carbons (ACs) were fluorinated at various fluorine partial pressures (0.01~0.03 MPa) and the
ion adsorption of fluorinated ACs was investigated. According to BET and XPS results, the specific surface area and total pore volume of fluorinated ACs increased by 24.7 and 55.8%, respectively, and fluorine functional groups were introduced to AC surface. The most optimized condition of
ion adsorption was confirmed at the fluorine partial pressure of 0.02 MPa. And also the removal efficiency of
ion was up to 98% at 300 mg/L of the initial concentration, and these results showed an approximately three-fold increase compared to that of using untreated ACs. Furthermore, the
ion adsorption of fluorinated ACs was completed in less than 30 min in contrast with untreated ACs, which was expected to be an increase of the affinity between
ions and ACs surfaces by fluorination.
Comparative Studies on Three Kinds of Reductants Applicable for the Reduction of Graphene Oxide
Park, No Il ; Park, Wan-Su ; Lee, Seul Bi ; Lee, Seong Min ; Chung, Dae-Won ;
Applied Chemistry for Engineering, volume 26, issue 1, 2015, Pages 99~103
DOI : 10.14478/ace.2014.1127
We conducted reduction reactions of graphene oxide (GO) using three selected reductants. The conductivity and solubility of three kinds of the reduced graphene oxides (RGOs) were examined based on the degree of reduction. When the ethylene glycol (EG) was used as a reductant, the reduction reaction did not sufficiently progress and as a result the conductivity of RGOs was observed to be relatively low. For RGOs made by hydrazine (HZ) and thiourea dioxide (TU), we observed no significant differences in the degree of the reduction, conductivity and dispersity in water. However, RGO prepared by TU showed an exceptionally good solubility in N-methylpyrrolidone, and the solution was stable for more than 4 months.
Characteristics of Polyester Polymer Concretes Using Spherical Aggregates from Industrial By-Products (III) (Using an Atomizing Steel Slag as a Filler and Fine Aggregate)
Hwang, Eui-Hwan ; Kim, Jin-Man ;
Applied Chemistry for Engineering, volume 26, issue 1, 2015, Pages 104~110
DOI : 10.14478/ace.2014.1131
It is known that polymer concretes are 8~10 times more expensive than ordinary Portland cement concretes; therefore, in the production of polymer concrete products, it is very important to reduce the amount of polymer binders used because this occupies the most of the production cost of polymer concretes. In order to develop a technology for the reduction of polymer binders, smooth and spherical aggregates were prepared by the atomizing technology using the oxidation process steel slag (electric arc furnace slag, EAFS) and the reduction process steel slag (ladle furnace slag, LFS) generated by steel industries. A reduction in the amount of polymer binders used was expected because of an improvement in the workability of polymer concretes as a result of the ball-bearing effect and maximum filling effect in case the polymer concrete was prepared using the smooth and spherical atomized steel slag instead of the calcium carbonate (filler) and river sand (fine aggregate) that were generally used in polymer concretes. To investigate physical properties of the polymer concrete, specimens of the polymer concrete were prepared with various proportions of polymer binder and replacement ratios of the atomized reduction process steel slag. The results showed that the compressive strengths of the specimens increased gradually along with the higher replacement ratios of the atomized steel slag, but the flexural strength showed a different maximum strength depending on the addition ratio of polymer binders. In the hot water resistance test, the compressive strength, flexural strength, bulk density, and average pore diameter decreased; but the total pore volume and porosity increased. It was found that the polymer concrete developed in this study was able to have a 19% reduction in the amount of polymer binders compared with that of the conventional product because of the remarkable improvement in the workability of polymer concretes using the spherical atomized oxidation steel slag and atomized reduction steel slag instead of the calcium carbonate and river sand.
Stereoselective Synthesis of Novel Bestatin Analogs
Seo, Youngran ; Lee, SooBeom ; Kim, Young Gyu ;
Applied Chemistry for Engineering, volume 26, issue 1, 2015, Pages 111~115
DOI : 10.14478/ace.2014.1134
Two new analogs of bestatin were prepared from
-valine in a stereoselective and efficient way. An aminopeptidase inhibitor bestatin shows significant biological effects on immunomodulation and is marketed for the treatment of acute myelocytic leukemia. The key intermediates, trans-oxazolidine methyl esters 2a and 2b, were obtained with more than 20 to 1 stereoselectivity in a one-pot procedure by the three cascade reactions between N-hydroxymethyl protected
-amino aldehydes (4a and 4b) and phenylsulfonylnitromethane (
) and the following in-situ ozonolysis. Basic hydrolysis of 2a and 2b, and then the peptide coupling with
-Leu-OMe produced the protected derivatives of two new bestatin analogs, 3a and 3b, respectively. The new isobutyl and isopropyl analogs of bestatin (1a and 1b) were produced in overall 51% and 38% yields, respectively, with high stereoselectivity from the corresponding protected
-amino aldehydes 4 in a six-step process.
Optimization for Higher Sensitive Measurements of FET-type Sensors
Sohn, Young-Soo ;
Applied Chemistry for Engineering, volume 26, issue 1, 2015, Pages 116~119
DOI : 10.14478/ace.2014.1122
Field-effect transistor (FET)-based ion or biosensors have been intensively studied so far. Among many measurement methods, the variation of the drain current can be induced when ions or biomolecules are interacted with sensing membranes located on the gate insulator of FET. One of typical FET-type sensors is an ion-sensitive field-effect transistor (ISFET) utilized in this study. In ISFET, the voltage is usually applied to the reference electrode instead of the gate voltage. Firstly, the voltage applied to the reference electrode versus the drain current was observed, and the steepest slope in this graph was found. Using this point, the optimized condition was established for the larger variation of the drain current in the saturated region in response to the variation of the input in the dynamic range.