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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 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
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Preparation of Three-Dimensional Graphene/Metal Oxide Nanocomposites for Application of Supercapacitors
Kim, Jung Won ; Choi, Bong Gill ;
Applied Chemistry for Engineering, volume 26, issue 5, 2015, Pages 521~525
DOI : 10.14478/ace.2015.1101
Graphene-based electrode materials have been widely explored for supercapacitor applications due to their unique two-dimensional structure and properties. In particular, Three-dimensional (3D) graphene materials are of great importance for preparing electrode materials because they can provide large surface area, efficient and rapid electron and ion transfer, and mechanical stability. Recently, a number of 3D hybrid architecture of graphene/metal oxides have been developed to increase simultaneously energy and power densities of supercapacitors. This review presents the recent progress of 3D nanocomposites based on graphene and metal oxides. Preparation methods and structures of these 3D nanocomposites and their great potential in supercapacitor applications have been summarized.
III-V Tandem, CuInGa(S,Se)
, and Cu
Compound Semiconductor Thin Film Solar Cells
Jeong, Yonkil ; Park, Dong-Won ; Lee, Jae Kwang ; Lee, Jaeyoung ;
Applied Chemistry for Engineering, volume 26, issue 5, 2015, Pages 526~532
DOI : 10.14478/ace.2015.1089
Solar cells with other alternative energies are being importantly recognized related with post-2020 climate change regime formation. In a point of view of materials, solar cells are classified to organic and inorganic solar cells which can provide a plant-scale electricity. In particular, recent studies about compound semiconductor solar cells, such as III-V tandem solar cells, chalcopyrite-series CIGSSe solar cells, and kesterite-series CZTSSe solar cells were rapidly accelerated. In this report, we introduce a research trend and technical issues for the compound semiconductor solar cells.
Isolation of Chlorella vulgaris Mutants Producing High Lipid and their Characterization
Choi, Soo-Jeong ; Park, Hyun-Jin ; Lee, Jae-Hwa ;
Applied Chemistry for Engineering, volume 26, issue 5, 2015, Pages 533~537
DOI : 10.14478/ace.2014.1135
Micro-algae Chlorella vulgaris (C. vulgaris) is an important source for bio-diesel because of the high content of neutral lipids. In this study, we intended to induce mutants of C. vulgaris by UV-B irradiation. C. vulgaris was first exposed to UV-B for 1, 2, 3, 4, 5 min. As the UV-B exposure time increased, the cell viability and pigment content were decreased. Mutants of C. vulgaris were also induced through ultraviolet irradiation and two strains were selected with respect to lipid contents, where were named as 'UM10', 'UM15'. They were then cultivated in the same way as to the wild type. After 21 days of cultivation, the cell growth, dry cell weight, pigment contents, and lipid contents were measured for investigating characteristics of mutants. As a result, the cell growth and dry cell weight of both mutants increased about 1.4 and 1.5 times, respectively compared with those of wild type. In addition, chlorophyll and carotenoid contents were measured in order to investigate pigment contents in micro-algae through photosynthesis. It was shown that chlorophyll and carotenoid contents of both mutants decreased about 10% compared to those of wild type. Lipid contents in UM10 and UM15 increased about 1.2 and 1.5 times, respectively compared to that of wild type.
Studies on Cure Kinetics and Thermal Stability of Epoxy/Nylon 6 Blend
Kim, Dong-Kyu ; Kim, Kwan-Woo ; Han, Woong ; Kwac, Lee-Ku ; Kim, Byung-Joo ;
Applied Chemistry for Engineering, volume 26, issue 5, 2015, Pages 538~542
DOI : 10.14478/ace.2015.1017
In this work, effects of the blend composition composed of 0, 10, 20, 30 and 40 wt% of nylon 6 to epoxy (diglycidylether of bisphenol-A, DGEBA) resin were investigated in terms of cure kinetics and thermal stability by differential scanning calorimeter (DSC) and thermogravimetric analysis (TGA). As the content of the nylon 6 increased, the maximum exothermic temperature (
) and the value of cure activation energy (
) decreased. The maximum exothermic temperature of the blending samples decreased with increasing in nylon 6 content, resulting in the decrease in curing activation energy of them due to the rapid curing reaction with epoxy resin in this system. From TGA analysis results of the DGEBA/nylon 6, the thermal stability based on the thermal stability index (
) and integral procedure decomposition temperature (IPDT) increased with increase in the nylon 6 content. This was because of the combination of DGEBA and nylon 6 having good heat resistance, resulting in improving thermal stability of the DGEBA/nylon 6.
Synthesis and Electrochemical Characteristics of Mesoporous Silicon/Carbon/CNF Composite Anode
Park, Ji Yong ; Jung, Min Zy ; Lee, Jong Dae ;
Applied Chemistry for Engineering, volume 26, issue 5, 2015, Pages 543~548
DOI : 10.14478/ace.2015.1056
Si/C/CNF composites as anode materials for lithium-ion batteries were examined to improve the capacity and cycle performance. Si/C/CNF composites were prepared by the fabrication process including the synthesis and magnesiothermic reduction of SBA-15 to obtain Si/MgO by ball milling and the carbonization of phenol resin with CNF and HCl etching. Prepared Si/C/CNF composites were then analysed by BET, XRD, FE-SEM and TGA. Among SBA-15 samples synthesized at reaction temperatures between 50 and
, the SBA-15 at
showed the largest specific surface area. Also the electrochemical performances of Si/C/CNF composites as an anode electrode were investigated by constant current charge/discharge test, cyclic voltammetry and impedance tests in the electrolyte of LiPF6 dissolved in mixed organic solvents (EC : DMC : EMC = 1 : 1 : 1 vol%). The coin cell using Si/C/CNF composites (Si : CNF = 97 : 3 in weight) showed better capacity (1,947 mAh/g) than that of other composition coin cells. The capacity retention ratio decreased from 84% (Si : CNF = 97 : 3 in weight) to 77% (Si : CNF = 89 : 11 in weight). It was found that the Si/C/CNF composite electrode shows an improved cycling performance and electric conductivity.
Preparation of Porous Anti-Insect Repellent Powder Using Spray Drying of Medicinal Herbal Extracts Anti-Insect Repellent Silica Sol
Park, Hee Young ; Hwang, KiSeob ; Kim, Jung-Hyeon ; Lee, Jun-Young ;
Applied Chemistry for Engineering, volume 26, issue 5, 2015, Pages 549~556
DOI : 10.14478/ace.2015.1067
Anti-insect repellent silica sol from mixture with silica and anti-insect repellent solution extracted from medicinal herbs was prepared. The micron size porous sphere powder with anti-insect repellent solution was prepared by the spray drying method. The characteristic of anti-insect repellent powder using spray drying method was analyzed by FE-SEM, PSA, TGA with the concentration of anti-insect repellent sol (anti-insect repellent solution and silica) and conditions of spray drier. The average particle size of 4, 7 wt% and 10 wt% of anti-insect repellent sol concentration were 8.3,
, respectively. The particle size is increasing with high concentration of anti-insect repellent sol. Other hands, particle size as the temperature of inlet nozzle and velocity of sol injection were nearly same at high velocity of gas injection. Also, Anti-insect repellent impregnation in porous sphere powder were confirmed by TGA methode and its thermal property was stable up to
. We expect that anti-insect repellent powder is applied for plastic compound and process of film manufacture.
Desulfurization Characteristics of Domestic Limestones through Simultaneous Calcination and Desulfurization Reaction
Shin, Ji Hoon ; Kim, Yea Ra ; Kook, Jin Woo ; Kwak, In Seop ; Park, Kyoung-Il ; Lee, Jong-Min ; Lee, See Hoon ;
Applied Chemistry for Engineering, volume 26, issue 5, 2015, Pages 557~562
DOI : 10.14478/ace.2015.1071
In order to analyze and compare the desulfurization characteristics of five different kinds of domestic limestons, a thermogravimetric analyzer (TGA) was used in this study. Calcium carbonate contents of the domestic limestone varied from 91 to 96 wt%. Experimental temperature and sulfur dioxide concentration of
and 2,750 ppm, respectively were selected to simulate commercial operation conditions. In this study, the calcination and desulfurization reaction of limestones were simultaneously occurred and investigated to simulate in-situ desulfurization reaction in commercial circulating fluidized bed combustors. In addition, desulfurization reactivities of limes having the average particle sizes of 37.5, 90.5, 159, 356 and
were investigated. Desulfurization reactivities via simultaneous calcination and desulfurization reactions were 5-20% lower than those of using general desulfurization reactions.
Characterization and Transdermal Delivery of Ethosomes Loaded with Liquiritigenin and Liquiritin
Im, Na Ri ; Kim, Hae Soo ; Lim, Ji Won ; Kim, Kyeong Jin ; Noh, Geun Young ; Park, Soo Nam ;
Applied Chemistry for Engineering, volume 26, issue 5, 2015, Pages 563~568
DOI : 10.14478/ace.2015.1072
Liquiritin and its aglycone, liquiritigenin are flavonoid found in licorice that show anti-oxidant and anti-aging properties. In this study, ethosomes loaded with hydrophobic liquiritigenin or liquiritin were prepared as a transdermal delivery system. The particle size, entrapment efficiency, and skin permeability of ethosomes were evaluated. Ethosome containing liquiritigenin was stable up to 2 mM and ethosome containing liquiritin was stable up to 0.75 mM concentration. The particle size of ethosomes containing 0.75 mM liquiritigenin and liquiritin was 143.85 and 158.90 nm, respectively and the entrapment efficiency was 47.51 and 54.61%, respectively. The entrapment efficiency was improved with increasing concentrations of drugs. Ethosomes loaded with liquiritigenin or liquiritin were superior in skin permeation ability compared to that of 20% ethanol solution and conventional liposomes. These results suggest that ethosomes containing 0.50 mM liquiritigenin or liquiritin are effective for the skin permeation and may be used as an antiaging and antioxidant ingredient in cosmetic formulation.
Isolation of an Arthrospira platensis Mutant Induced by Electron Beam Irradiation and its Characterization
Choi, Soo-Jeong ; Lee, Jae-Hwa ;
Applied Chemistry for Engineering, volume 26, issue 5, 2015, Pages 569~574
DOI : 10.14478/ace.2015.1076
Arthrospira platensis has high lipid and pigment (such as chlorophyll and carotenoid) contents and thus evaluated as an important resource in functional food production. The cell growth rate and pigment concentration of EM24 increased by approximately 1.2-fold than those of the wild-type strain (WT). Fluorescence intensity levels in EM24, which were quantified with a lipid triolein standard curve, also increased by approximately 1.5-fold than those in WT (62.9 mg/Lvs. 38.9 mg/L). The analysis of fatty acid profiles indicated that the gamma-linoleic acid level in EM24 increased by 1.5-fold than that in WT.
Effect of Preparation Method for Pd/C Catalysts on Pd Characterization and their Catalytic Activity
Kim, Ji Sun ; Hong, Seong-Soo ; Kim, Jong-Hwa ; Lee, Man Sig ;
Applied Chemistry for Engineering, volume 26, issue 5, 2015, Pages 575~580
DOI : 10.14478/ace.2015.1080
Pd/C catalysts were prepared by various preparation methods such as ion exchange, impregnation and polyol method and also characterized by nitrogen adsorption-desorption isothermal, XRD, FE-TEM and CO-chemisorption. The activities of these catalysts were tested in the hydrogenation of cyclohexene to cyclohexane. Catalytic activities of Pd/C catalysts were found to be effected by the chosen preparation methods. Pd dispersions of each Pd/C catalysts prepared by ion exchange, impregnation and polyol method were 17.55, 13.82% and 1.35%, respectively, confirmed by CO-chemisorption analysis. These were also in good agreement with the FE-TEM results. The Pd/C catalyst prepared by ion exchange method exhibits good performance with the cyclohexene conversion rate of 71% for 15 min. These results indicate that Pd/C catalyst having higher dispersion and lower particle size is in favor of hydrogenation cyclohexene and also Pd dispersion increases with the increment of catalytic activity.
Equilibrium, Kinetics and Thermodynamics Studies about Adsorption of Safranin by Granular Activated Carbon
Lee, Jong Jib ;
Applied Chemistry for Engineering, volume 26, issue 5, 2015, Pages 581~586
DOI : 10.14478/ace.2015.1081
Adsorption of Safranin using granular activated carbon from aqueous solution was investigated. Batch experiments were carried out as a function of adsorbent dose, initial concentration, contact time and temperature. The equilibrium adsorption data were fitted to Langmuir, Freundlich and Dubinin-Radushkevich isotherm models. Based on an estimated Langmuir separation factor,
and a Freundlich separation factor, 1/n = 0.518~0.547, this process could be employed as an effective treatment method. Adsorption data were also modeled using the pseudo-first and second-order kinetic equations. It was shown that the pseudo-second-order kinetic equation could best describe the adsorption kinetics. The negative Gibbs free energy (
) and positive enthalpy (
) indicated that the adsorption process was spontaneous and endothermic.
Adsorption Characteristics of Toluene Gas Using Fluorinated Phenol-based Activated Carbons
Kim, Min-Ji ; Jung, Min-Jung ; Kim, Min Il ; Choi, Suk Soon ; Lee, Young-Seak ;
Applied Chemistry for Engineering, volume 26, issue 5, 2015, Pages 587~592
DOI : 10.14478/ace.2015.1083
Activated carbons (ACs) were treated by fluorination to improve the adsorption property of toluene gas among volatile organic compounds (VOCs). The pore characteristics and surface properties of these activated carbons were evaluated by BET and XPS and the adsorption property and removal efficiency of toluene gas was investigated by gas chromatography. The breakthrough time of fluorinated ACs was increased about 27% compared to that of untreated ACs when the toluene gas of 100 ppm was flowed at a flow rate of
. Fluorinated AC of 0.1 g adsorbent totally adsorbed toluene gas in 100 ppm to 100 % during the adsorption time in 19 h. These results can be used as a treatment technology or removal of carcinogenic materials such as toluene.
A Study on the Synthesis of Tricyclopentadiene Using Ionic Liquid Catalysts
Kim, Su-Jung ; Han, Jeongsik ; Jeon, Jong-Ki ; Yim, Jin-Heong ;
Applied Chemistry for Engineering, volume 26, issue 5, 2015, Pages 593~597
DOI : 10.14478/ace.2015.1084
Tricyclopentadiene (TCPD) as a next generation high density fuel was synthesized by Diels-Alder oligomerization reaction of DCPD. TCPD was prepared by ionic liquid (IL) catalysts with combination of cationic and anionic precursors. Two kinds of anionic precursors such as copper(I) chloride (CuCl) and iron(III) chloride (
) and cationic precursors such as triethylamine hydrochloride (TEAC) and 1-butyl-3-methylimidazolium chloride (BMIC) were used. The preparation of TCPD using IL catalyst was superior to that using Diels-Alder reaction in terms of DCPD conversion and TCPD yield. In addition, TCPD yield was correlated with Lewis acidity by changing the ratio of anionic and cationic precursors. The TCPD yield was higher when using CuCl as anionic precursor than that of using
. Control of Lewis acidity by changing the molar ratio of anionic and cationic precursors could further improve TCPD yield as well.
Influence of Textural Structure by Heat-treatment on Electrochemical Properties of Pitch-based Activated Carbon Fiber
Kim, Kyung Hoon ; Park, Mi-Seon ; Jung, Min-Jung ; Lee, Young-Seak ;
Applied Chemistry for Engineering, volume 26, issue 5, 2015, Pages 598~603
DOI : 10.14478/ace.2015.1085
In this study, electrochemical properties of pitch-based activated carbon fibers (ACFs) were investigated by different heat-treatment temperature of the pitch-based ACFs in order to improve the specific capacitance of electric double-layer capacitor (EDLC). The ACFs were prepared by different heat-treatment temperatures of 1050 and
, after activation with 4 M KOH at
using stabilized pitch fiber. The specific surface area of prepared ACFs increased from
, also the micropore and mesopore volumes of prepared ACFs were increased. These results because pore was produced by desorbing oxygen and hydrogen elements within the ACFs, and pore size was increased by contraction ACFs by heat-treatment process. Because of the porous properties, the specific capacitance was increased from 73 F/g to 119 F/g using cyclic voltammetry with 1 M
at scan rates of 5 mV/s.
Enhancement of Nitrate Removal Ability in Aqueous Phase Using Ulmus davidiana Bark for Preventing Eutrophication
Choi, Suk Soon ; Choi, Jung Hoon ; Kim, Min-Ji ; Lee, Young-Seak ; Ha, Jeong Hyub ; Cha, Hyung Joon ;
Applied Chemistry for Engineering, volume 26, issue 5, 2015, Pages 604~608
DOI : 10.14478/ace.2015.1086
In the present work, the improvement of nitrate removal ability was investigated to resolve a eutrophication problem by using Ulmus davidiana (U. davidiana) bark generated from Gangwon province. When the initial pH of aqueous solution was adjusted to 3.5 in batch experiments, the removal efficiencies for 10 and 20 mg/L nitrate increased up to 43 and 37%, respectively. In addition, when U. davidiana bark of 1.0 g/100 mL was used for 8 h, the removal efficiency for 20 mg/L nitrate was 68%. Moreover, when reforming reaction of U. davidiana bark was performed under oxyfluorination conditions, the optimal ratio of partial pressure between fluorine and oxygen was 1 : 9 for an enhanced nitrate adsorption amount. When reformed U. davidiana bark was used for 8 h operation under the optimal oxyfluorination condition, removal efficiencies for 10, 20 and 40 mg/L nitrate were found to be 96, 95 and 59%, respectively. Collectively, these results suggest that our water treatment technology can be effectively utilized to treat high concentrations of nitrate in water bodies.
Emission of Carbon Monoxide and Carbon Dioxide Gases during Fire Tests of Specimens Treated with Phosphorus-Nitrogen Additives
Chung, Yeong-Jin ;
Applied Chemistry for Engineering, volume 26, issue 5, 2015, Pages 609~614
DOI : 10.14478/ace.2015.1088
This study was to investigate the production of combustion toxic gases of pinus rigida specimens treated with pyrophosphoric acid (PP)/4ammonuium ion (
), methylenepiperazinomethyl-bis-phosphonic acid (PIPEABP) and PIPEABP/
. Each pinus rigida plates was painted in three times with 15 wt% in the aqueous solution followed by drying the species at room temperature. Emission of combustion toxic gases was examined by the cone calorimeter (ISO 5660-1). First-time to peak mass loss rate (1st-
) treated with chemicals was delayed upto 66.7~250.0% compared to those of untreated specimens. For test pieces treated with the chemicals, the emission of peak carbon monoxide (
) values of 0.0136~0.0178% and peak carbon dioxide (
) value of 0.04432~0.3648% were obtained, which were higher than those for the virgin plate. In particular, oxygen emission is much higher than the level of 15% which can be fatal to humans. Therefore, the resulting risk could be eliminated. However it is supposed that the combustion-toxicities were partially increased compared to those of virgin plate.
Effect of the Compatibilizer on Physical Properties of Polypropylene (PP)/Bamboo Fiber (BF) Composites
Lee, Jong Won ; Ku, Sun Gyo ; Lee, Beom Hee ; Lee, Ki-Woong ; Kim, Cheol Woo ; Kim, Ki Sung ; Kim, Youn Cheol ;
Applied Chemistry for Engineering, volume 26, issue 5, 2015, Pages 615~620
DOI : 10.14478/ace.2015.1091
Polypropylene (PP)/bamboo fiber (BF) composites were fabricated by twin screw extruder in order to investigate effects of the compatibilizer on physical properties of PP/BF composites. The content of BF changed from 10 to 25 wt% and that of the compatibilizer was fixed at 3 wt%. Maleic anhydride grafted PP (PP-g-MAH) was used to increase the compatibility between PP and BF as a compatibilizer. Chemical structures of the composites were confirmed by the existence of carbonyl group (C=O) stretching peak at
in FT-IR spectrum. Considering the degradation and mechanical properties, the optimum extrusion conditions were selected to be
and 100 rpm, respectively. There was no distinct changes in melting temperature of the composites, but the crystallization temperature increased by
owing to the heterogeneous nuclei of BF. It was checked that the optimum BF content was in the range of 15-20 wt% from the results of tensile and flexural properties of the composites. The effect of the compatibilizer on mechanical properties was confirmed by SEM images of fractured surface and contact angles.
Recovery of MFB Generated from Dimethyl Terephtalate Production Process
Kim, Sun Ho ; Ryu, Young ; Kim, Jong Cheon ; Kim, Seok Chan ;
Applied Chemistry for Engineering, volume 26, issue 5, 2015, Pages 621~623
DOI : 10.14478/ace.2015.1045
This article describes a purification method yielding high purity of MFB produced from DMT production process. Aldehyde functional group of MFB included in side-products were converted to acetal compound via reacting with methanol and further separated. Hydrolysis process of the acetal product was continued under acidic condition and highly pure MFB were obtained with 90% yield. The structure of MFB was analyzed by
NMR spectroscopy. Also, the purity of MFB was estimated to be over 99% by GC analysis.
Hydrogen Peroxide Sensitive Biosensors Based on Mugwort-Peroxidase Entrapped in Carbon Pastes
Yoon, Kil Joong ;
Applied Chemistry for Engineering, volume 26, issue 5, 2015, Pages 624~629
DOI : 10.14478/ace.2015.1075
A biosensor including the homogenized tissue of mugwort embedded in carbon paste, which senses hydrogen peroxide, was constructed and its electrochemical properties were validated using voltammetry. The good linearity of Hanes-Woolf plot implied that the reduction reaction of substrate was catalyzed by mugwort peroxidase at the electrode surface. Also the small value of symmetry factor, 0.28, indicated that electrochemical kinetics of the sensor is very sensitive to the change of electrode potential. Many experimental results collected above proved that the dissociation of hydrogen peroxide is dependent on the catalytic power of mugwort peroxidase qualitatively and quantitatively at the surface of the mugwort electrode. It is our firm belief that the marketed HRP can be replaced with mugwort tissue.