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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Applied Chemistry for Engineering
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Journal DOI :
The Korean Society of Industrial and Engineering Chemistry
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Volume & Issues
Volume 21, Issue 6 - Dec 2010
Volume 21, Issue 5 - Oct 2010
Volume 21, Issue 4 - Aug 2010
Volume 21, Issue 3 - Jun 2010
Volume 21, Issue 2 - 00 2010
Volume 21, Issue 1 - 00 2010
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Zeolite and Zeolite/Polymer Composite Membranes: Promises and Challenges
Jeong, Hae-Kwon ;
Applied Chemistry for Engineering, volume 21, issue 5, 2010, Pages 481~487
Recently membrane-based gas separation has attracted a great deal of research interests due to the growing demands on greener technologies. Current membrane-based gas separation is dominant by polymer membranes and limited mostly to non-condensable gases even though condensable gases such hydrocarbon isomers are much more attractive. This is primarily due to the limitations of polymer materials. Zeolites and their composites with polymer can offer alternative to current polymeric membranes owing to their superior separation and chemical/thermal properties. This review is intended to provide a brief overview on zeolite and zeolite/polymer composite membranes for gas separation applications.
Evaluation on the Possibility of Preparation of Nanosized Alumina Powder under W/O Emulsion Method Using Homogenizer
Lee, Yoong ; Hahm, Yeong-Min ;
Applied Chemistry for Engineering, volume 21, issue 5, 2010, Pages 488~494
Under W/O emulsion method using a homogenizer,
-alumina powder was prepared to evaluate the effects of experimental conditions on its properties, such as particle shape, extent of aggregation, average particle size and distribution. The experimental parameters were the change of type, quantity and composition of emulsifiers as well as the change of O : W volumetric ratio and agitation rate. As results, in the case of the use of single surfactant of SP80, sphere-like particles could be prepared and the average particle size was hardly affected by the agitation speed more than 16000 rpm regardless of SP80 quantity used. When the extent of aggregation among sphere-like particles prepared using
= 5 of [SP80 & TW80] was compared with that prepared using SP80 at the same vol% surfactant and agitation speed, the former showed more or less low aggregation phenomena and average particle size was slightly reduced. In addition, the fraction of nano-sized particles with low aggregation was increased by the use of 0.1 vol% n-butanol, as a co-surfactant, with
= 5 of [SP80 & TW80].
Preparation of Bio-Chemical Sensor Electrodes by Using Electrical Impedance Properties of Carbon Nanotube Based Bulk Materials
So, Dae-Sup ; Huh, Hoon ; Kim, Hee-Jin ; Lee, Hai-Won ; Kang, In-Pil ;
Applied Chemistry for Engineering, volume 21, issue 5, 2010, Pages 495~499
To develop chemical and biosensors, this paper studies sensing characteristics of bulk carbon nanotube (CNT) electrodes by means of their electrical impedance properties due to their large surface area and excellence chemical absorptivity. The sensors were fabricated in the form of film and nano web style by using composite process for mass production. The bulk composite electrodes were fabricated with singlewall and multi-wall carbon nanotubes based on host polymers such as Nafion and PAN, using a solution-casting and an electrospinning technique. The resistance and the capacitance of electrodes were measured with LCR meter under the various amounts of buffer solution to study the electrical impedance change properties of them. On the experimental of sensor electrode, impedance characteristics of the composite electrode are affected by its host polymer and nanofiller and its sensing response showed saturated result after applying some amounts of buffer solution for test chemical. Especially, the capacitance values showed drastic changes while the resistance values only changed within few percent range. It is deduced that the ions in the solution penetrated and diffused into the electrodes surface changed the electrical properties of the electrodes much like a doping effect.
Dispersity and Electro-Conductivity of PU Grafted MWCNT/PU Composite via Simple Blending Method
Yun, Sung-Jin ; Im, Hyun-Gu ; Kim, Joo-Heon ;
Applied Chemistry for Engineering, volume 21, issue 5, 2010, Pages 500~504
The PU-g-MWNTs/PU film was synthesized by simple blending method to fabricate composites which have excellent mechanical and electrical properties. PU-g-MWNTs based composite revealed much enhanced dispersity than pristine MWNTs composite because of interfacial interaction related with interfacial compatibility between polymer matrix and PU on the MWNTs surface. The electro-conductivity of composite was measured as a function of PU-g-MWNTs concentration. The results were correlated with percolation threshold theory. As a result, the critical concentration and exponent of electro-conductivity behavior was equal to 0.78 wt% and 0.945.
Study on Desorption Reaction of VOC Produced from Manufacturing of Chemical Products
Park, Kuny-Ik ; Yoon, Sung-Min ; Kim, Joo-Yeon ; Kil, In-Sub ; Park, Hi-Jae ; Rhee, Young-Woo ;
Applied Chemistry for Engineering, volume 21, issue 5, 2010, Pages 505~508
The characteristics of desorption reaction for spent activated carbon produced from the manufacture of other chemical products in Shiwha/Banwal industrial complex were investigated. TGA (Thermogravimetric Analyzer) was used to study for characteristics of desorption and kinetics. Then Friedman method and Freeman-carroll method were used to find the activation energy and the order of reaction. Activation energy by Friedman method was 24.82~46.49 kJ/moL. And then activation energy and order of reaction by Freeman-carroll method were 8.77~32.26 kJ/moL and 0.11~1.69.
Extraction of Yttrium and Europium with Fatty Acids as Extractants
Bang, Kyung-Mo ; Ryu, Ho-Jin ; Choi, Min-Bae ; Kang, Ho-Cheol ;
Applied Chemistry for Engineering, volume 21, issue 5, 2010, Pages 509~513
Recently, an amount of waste electronic devices such as LED and trichromatic fluorescent lamp has increased with the development of electronic industry. Reportedly, rare earth metals such as yttrium and europium have been discovered in the waste electronic devices. In order to improve the selectivity of yttrium and europium, the effects of the following factors on recovery experiment have been considered : i) fatty acids with various alkyl chain lengths, ii) the concentration of extractant, and iii) pH. The results show that the extraction efficiencies decrease at the same pH with decreasing the concentration of extractant and so
(That value of pH in an aqueous phase at which the distribution ratio is unity at equilibrium: 50% of the solute is extracted (E = 0.5) only when the phase ratio is unity.) moves into higher pH. The highest selectivity of yttrium and europium was obtained with tetradecanoic acid as extractant. The extraction mechanism of yttrium and europium was varied with the change of concentration of the tetradecanoic acid.
single-species was formed from the yttrium and europium ion in the extractant concentration less than 0.1 M. On the other hand, the yttrium or europium ion is solvated with three molecules of tetradecanoic acid monomer like
3RH in the extractant concentration more than 0.1 M.
Silica/polymer Nanocomposite Containing High Silica Nanoparticle Content : Change in Proton Conduction and Water Swelling with Surface Property of Silica Nanoparticles
Kim, Ju-Young ; Kim, Seung-Jin ; Na, Jae-Sik ;
Applied Chemistry for Engineering, volume 21, issue 5, 2010, Pages 514~521
A new one-shot process was employed to fabricate proton exchange membranes (PEMs) over conventional solvent-casting process. Here, PEMs containing nano-dispersed silica nanoparticles were fabricated using one-shot process similar to the bulk-molding compounds (BMC). Different components such as reactive dispersant, urethane acrylate nonionmer (UAN), styrene, styrene sulfuric acid and silica nano particles were dissolved in a single solvent dimethyl sulfoxide (DMSO) followed by copolymerization within a mold in the presence of radical initiator. We have successfully studied the water-swelling and proton conductivity of obtained nanocomposite membranes which are strongly depended on the surface property of dispersed silica nano particles. In case of dispersion of hydrophilic silica nanoparticles, the nanocomposite membranes exhibited an increase in water-swelling and a decrease in methanol permeability with almost unchanged proton conductivity compared to neat polymeric membrane. The reverse observations were achieved for hydrophobic silica nanoparticles. Hence, hydrophilic and hydrophobic silica nanoparticles were effectively dispersed in hydrophilic and hydrophobic medium respectively. Hydrophobic silica nanoparticles dispersed in hydrophobic domains of PEMs largely suppressed swelling of hydrophilic domains by absorbing water without interrupting proton conduction occurred in hydrophilic membrane. Consequently, proton conductivity and water-swelling could be freely controlled by simply dispersing silica nanopartilces within the membrane.
Heat Storage Material by Using Phase Change Materials to Control Buildings Thermal Environment Characteristics
Yun, Huy-Kwan ; Han, Seong-Kuk ; Shim, Myeong-Jin ; Ahn, Dae-Hyun ; Lee, Woong-Mok ; Park, Jong-Soon ; Kim, Jae-Yong ;
Applied Chemistry for Engineering, volume 21, issue 5, 2010, Pages 522~526
Heat storage application techniques can be categorized into the sensible heat storage and the latent heat storage according to the method of heat storage. Heat storage is the way of saving remaining heat when heating and cooling loads are light, and then using it when the heating and cooling loads are heavy. Latent heat storage is defined as the method of saving heat by using substances which have high potential heat when phase change is in the range of a certain temperature and when heat storage space is small, compared to those of sensible heat storage and it is possible that absorption and emission of heat at a certain temperature. This study is conducted to save energy when either air-conditioning or heating is operated in a building. We have tried to find out the essential properties of matter and the optimum mixing rate about cement and gypsum for building materials, which have been widely used for proper phase change materials (PCM), when thermal environment property is applied. So we obtained the result of the cooling delay effect about 19% with heat storage mortar containing 3 wt% of PCM.
Preparation of EMI Shielding Sheet by PVD Method and Its Characteristic of EMI Shielding Efficiency
Chae, Seong-Jeong ; Hong, Byung-Pyo ; Lee, Byoung-Soo ; Byun, Hong-Sik ;
Applied Chemistry for Engineering, volume 21, issue 5, 2010, Pages 527~531
The optimized sheet for EMI shielding was prepared by metal power with Fe series. Then various metal powders were deposited on the sheet by PVD method. Moreover, the PVdF nanofiber membrane was used to compare the characteristic of EMI shielding efficiency of various metal powders. The electrical property was measured by the 4-point probe method. The result from EDS confirmed that the metal powder existed on the sheet. EMI shielding efficiency was analysed by EMI shielding measurement apparatus. The lowest electrical resistance,
, was obtained with
deposition of Cu on the sheet. It was revealed that the EMI shielding efficiency increased with increase of the metal deposition thickness. The sheet deposited by Cu with
showed the highest EMI shielding efficiency, 32.5 dB.
Effect of Solvent Extraction on the Low Molecular Weight and Volatile Organic Compounds of Polycarbonate
Choi, Su-Jung ; Yoon, Kyung-Hwa ; Hwang, In-Hye ; Lee, Chang-Young ; Kim, Hee-Seung ; Yoo, Seung-Yoon ; Kim, Youn-Cheol ;
Applied Chemistry for Engineering, volume 21, issue 5, 2010, Pages 532~536
A study on the volatile organic compounds (VOCs) and low molecular weight (LMW) amount which is contained within bisphenol A polycarbonate (PC) was performed by the solvent extraction with ketone type solvents (acetone, butanone, pentanone). The LMW amount of untreated PC was 2.6 wt%, but the values of treated samples with acetone and pentanone were 0.96 and 1.53 wt%, respectively. Acetone is a more effective solvent than pentanone on the LMW extraction. Methylene chloride (MC) and toluene were certified and quantified by GC-Mass experiments, and the quantitative results indicated the fact that the pentanone was the effective solvent on VOC extraction. Focused on the change of VOCs and LMW amount, the use of co-solvent might be more useful, and the experimental results of co-solvent extraction showed that the optimum condition was 50 : 50 volume percent.
Synthesis of Pt-Sn/Carbon Electrodes by Reduction Method for Direct Methanol Fuel Cell
Jung, So-Mi ; Shin, Ju-Kyung ; Kim, Kwan-Sung ; Baeck, Sung-Hyeon ; Tak, Yong-Sug ;
Applied Chemistry for Engineering, volume 21, issue 5, 2010, Pages 537~541
Pt-Sn with various ratios was supported on carbon black after pretreatment in an acidic solution by a reduction method. The Pt/Sn ratio was controlled by varying the concentration of each component in the solution, and the influence of the composition on the electrocatalytic activities was investigated. The crystallinity of the synthesized materials was investigated by XRD (X-ray Diffraction), and the oxidation states of both the platinum and tin were determined by XPS (X-ray Photoelectron Spectroscopy). SEM (Scanning Electron Microscopy)-EDS (Energy Dispersive Spectroscopy) was utilized to examine the morphology and composition of the synthesized electrode, and the particle size of the Pt-Sn was analyzed by TEM (Transmission Electron Microscopy). The electrocatalytic activity for oxygen reduction was evaluated in a 0.5 M
solution using a rotating disk electrode system. The activity and stability were found to be strongly dependent on the electrode composition (Pt/Sn ratio). The catalytic activity and stability for methanol oxidation were also measured using cyclic voltammetry (CV) in a mixture of 0.5 M
and 0.5 M
aqueous solution. The addition of proper amount of Sn was found to significantly improve both catalytic activity and stability for methanol oxidation.
Synthesis of Poly(alkyl methacrylate)s Containing Various Side Chains for Pour Point Depressants
Hong, Jin-Sook ; Kim, Young-Wun ; Chung, Keun-Wo ; Jeong, Soo-Hwan ;
Applied Chemistry for Engineering, volume 21, issue 5, 2010, Pages 542~547
n-Paraffin and saturated fatty acid methyl esters in the diesel and bio-diesel fuel crystallize at low temperature. Many articles have addressed various solutions for the low temperature crystallization problem and one of them is the use of methacrylate copolymers. In this work, we synthesized a series of copolymers in the reaction condition of 70 : 30 molar ratio of lauryl methacrylate (LMA) (or stearyl methacrylate (SMA)) and alkyl methacrylates. The structures of the copolymers were characterized by
-NMR and FT-IR spectroscopy, and the molecular weight of copolymers were obtained from Gel Permeation Chromatography (GPC) method. The concentrations of additives were 500~1000 ppm and 1000~10000 ppm in diesel fuels and bio-diesel fuel (BD5 and BD20), respectively. The addition of copolymers changes the many properties of fuel such as the pour point (PP), cloud point (CP) and cold filtering plugging point (CFPP). For example, the low temperature properties of the copolymers containing SMA (
) were excellently improved about 15, 7, and
for PP, CP and CFPP, respectively.
Development of Selective Adsorption Process with Various Pore Size A-type Zeolite on Removal of Acetylenes for Isoprene Purification
Jun, Kyung-Jin ; Ahn, Byoung-Sung ; Yoo, Kye-Sang ;
Applied Chemistry for Engineering, volume 21, issue 5, 2010, Pages 548~552
This study focused on the development of effective adsorbent to remove acetylenes for the purification of isoprene. The adsorbents with various pore sizes from
were prepared to investigate the effect of pore size on selective adsorption of acetylene as an impurity. The pore size of zeolite A was adjusted by ion-exchange between Na and Ca ions. The pore size of adsorbents has affected the removal of acetylenes selectively because of the kinetic diameter of acetylenes, such as 2-methyl-1-butyne-3-yen (IPA) and 2-butyne. In a batch adsorption experiment, 5A zeolite with pore size of
showed the highest removal capacity of 2-butyne. However, IPA was hardly removed from isoprene by the A-type zeolites. For the adsorption isotherm, modified Langmuir model was well fitted with 2-butyne adsorption. Moreover, the regeneration of adsorbent was carried out to determine optimum method. The adsorbent heated for 12 h at
was regenerated significantly.
Circulating Fluidized Bed Combustion of Korean Anthracite and Fabricated Anthracite Fines
Shun, Do-Won ; Bae, Dal-Hee ; Oh, Chang-Sup ; Kim, Heon-Chang ;
Applied Chemistry for Engineering, volume 21, issue 5, 2010, Pages 553~558
To solve the problems of the low combustion activity of Korean anthracite and the abundant loss of unburned carbon in fly ash, pellet coal was fabricated from coal fines and fly ash, and the mixed combustion of coarse coal with the pellet coal was examined in the circulating fluidized bed combustor of a 0.1 MW scale test unit. In the combustion of the raw coal only, the significant amount of coal fines was entrained, resulting in overheat at the top of the combustor. With the coarse coal that most fines were eliminated, however, the combustion temperature was maintained stable. The mixed combustion of coarse and raw coals was also feasible even though it often went unstable. The mixed combustion of the coarse coal with the pellet coal was as stable as the coarse coal combustion, showing a promise that the combustion of the Korean anthracite in commercial circulating fluidized bed boilers could be further enhanced.
Presentation of Target Color with Extraction Variables in Natural Dyes Extraction
Tak, Eun-Soo ; Bae, Min-Woo ; Kang, Seung-Hyeon ; Bae, You-Jin ; Kang, Su-Yeon ; Jung, Soo-Kyung ; Hong, In-Kwon ;
Applied Chemistry for Engineering, volume 21, issue 5, 2010, Pages 559~563
The representation of color with natural dyes is closely related with the modern well-being life. This study is focused on the representation of target color of the blue, yellow, and red color system, these color sources were originated from the green tea, gardenia, and black rice respectively. The quantitative numerical value of brightness (L), color coordinates (a, b) were designated for the target color, the optimum color nearest to the target value was extracted with the solvent pH, temperature, and extraction time. The longer the extraction time had more thickening color in case of the gardenia. The L-a-b coordinate of extracted color were analyzed with the color difference meter and compared with the target color. The experimental variables were optimized to extract the color of the smallest
with the target color. As a result, the CIE standard value was proposed and the color was represented.
Change of Anti-reflective Optical Property by Nano-structural Control of Alumina Layer through Hydro-thermal Process
Lee, Yun-Yi ; Son, Dae-Hee ; Lee, Seung-Ho ; Lee, Gun-Dae ; Hong, Seong-Soo ; Park, Seong-Soo ;
Applied Chemistry for Engineering, volume 21, issue 5, 2010, Pages 564~569
Highly anti-reflective optical property has been focussed in the field of thin film and display because of increasing demands to the high transparency and clearness of optical component. In this study, to obtain anti-reflective property, the formation of aluminium oxide with nanoscaled flowerlike frame structure was introduced as oxide material monolayer on the substrate by hydrothermal synthesis through sol-gel method. The properties of coating layer were measured by the means of UV-Vis spectroscopy, FT-IR spectroscopy, XRD, and FE-SEM. The morphology of coating layer in alumina-sol coated samples was controlled by hydrothermal temperature and time with aid of ultrasound. It was found that high transparency and anti-reflective optical properties were obtained the formation of flowerlike nanoframe structure.
Thermal Environment Characteristic of the Heat Storage Gypsum Board Included with Phase Change Material
Kwon, Oh-Hoon ; Yun, Huy-Kwan ; Han, Seong-Kuk ; Ahn, Dae-Hyun ; Shim, Myeong-Jin ; Cho, Sung-Woon ; Park, Jong-Soon ; Kim, Jae-Yong ;
Applied Chemistry for Engineering, volume 21, issue 5, 2010, Pages 570~574
The main function of conventional insulation materials is only to block the heat transfer and reduce heat loss from the building. On the other hand, thermal storage materials can work as an energy saver by absorbing or emitting heat within a specific temperature range. Thermal storage materials for building can maintain a constant temperature by effectively regulating the cycle of indoor temperature. As a result, we can enhance the performance of a cooling and heating system efficiently. In this study, phase change materials (PCMs) were added as thermal storage materials into gypsum boards which are extensively used for building material and we found out the thermal environmental characteristics. In addition, we checked out some problems when applying the thermal storage materials to buildings. Finally, This study set out to examine the degree of environmental-friendly characteristics of thermal storage building materials by analyzing the amount of TVOC and HCHO contents with the possibility of pollutants emission.
Pyrolysis and Combustion Characteristics of an Oriental Oak Leaf
Seo, Young-Hoon ; Park, Jin-Mo ; Lee, Myung-Wook ; Kim, Jin-Soo ; Kim, Seung-Soo ;
Applied Chemistry for Engineering, volume 21, issue 5, 2010, Pages 575~580
Forest fires in Korea, having forest coverage of 70%, have kept increasing in number and scale since the middle of 1990's. Although deposited fallen leaves in forests such as herbaceous plants, conifers, and broadleaf trees are used as a medium for forest fires, the pyrolysis and combustion characteristics of the various species of trees are hardly studied. Oriental oak is the representative broadleaf tree in domestic forests, and pyrolysis and combustion of oriental oak leaf were carried out by thermogravimetic analysis (TGA). The leaf of oriental oak was ignited at
whereas pyrolysis started at
. The corresponding kinetic parameters including activation energy and pre-exponential factor were determined by differential method over the degree of conversions. The values of activation energies for pyrolysis were increased as the conversion increases from 10% to 80%, whereas those of values were decreased during combustion.
Preparation and Properties of Polyorganosiloxane Modified Maleated EPDM/EPDM Rubber Vibration Isolator
Kang, Doo-Whan ; Kim, So-Mi ;
Applied Chemistry for Engineering, volume 21, issue 5, 2010, Pages 581~585
The surface of Alnico, one of the industrial dust waste, was treated with 1,3,5-trivinyl-1,3,5-trimethylcyclotrisilazane (VMS) as a surface treating agent and used as the filler for vibration isolator rubber. Maleated EPDM prepared from bulk polymerization of EPDM with maleic anhydride was copolymerized with
-bis(3-aminopropyl)polydimethylsiloxane to obtain maleated EPDM-polydimethylsiloxane copolymer (MEPDM-PDMS). EPDM/Alnico/MEPDM-PDMS vibration isolator rubber was prepared from compounding with Alnico treated with surface treating agent, 25 and 50 phrs to EPDM, respectvely based on 1 to 10 wt% of MEPDM-PDMS to EPDM. From the measurement of the thermal properties to the rubber, the glass transition temperatures (Tg) for the rubber containing maleated EPDM-PDMS copolymer was slightly lower temperature,
than EPDM rubber, and also DMA results showed higher tan
peak to the rubber prepared from compounding with EPDM-PDMS copolymer. From the results, rubber prepared using EPDM-PDMS copolymer had better vibration isolator property.
Theoretical Study of Solvent Effect on Yield of Oxidative Addition Reaction
Lee, Chul-Jae ; Kim, Byung-So ;
Applied Chemistry for Engineering, volume 21, issue 5, 2010, Pages 586~589
In present work, oxidative addition reaction of 1,3-cycleohexandion (1,3-CHD) with ethyl vinyl ether (EVE) was attempted utilizing
/celite (SC) reagent. In order to optimize reaction conditions, we surveyed several solvents for the production of dihydrofuran with the (SC) system. The yield of the acetonitrile (AN), dimethyl sulfoxide (DMSO), benzene (BZ), and heptane (HT) are given 78, 40, 15, and 10%, respectively. Therefore, we studied the solvent effects on yields by using PM3 and ZINDO/1 parameter of semi-empirical method of HyperChem7.0 molecular modeling program.
Hydrothermal Synthesis of Li-Mn Spinel Nanoparticle from K-Birnessite and Its Electrochemical Characteristics
Kim, Jun-Il ; Lee, Jae-Won ; Park, Sun-Min ; Roh, Kwang-Chul ; Sun, Yang-Kook ;
Applied Chemistry for Engineering, volume 21, issue 5, 2010, Pages 590~592
Li-Mn spinel (
) is prepared by a hydrothermal process with K-Birnessite (
) as a precursor. The K-Birnessite obtained via a hydrothermal process with potassium permanganate [
] and urea [
] as starting materials are converted to Li-Mn spinel nanoparticles reacting with LiOH. The molar ratio of LiOH/K-Birnessite is adjusted in order to find the effect of the ratio on the structural, morphological and electrochemical performances of the Li-Mn spinel. X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDS), and thermogravimetry (TG) are used to investigate the crystal structure and morphology of the samples. Galvanostatic charge and discharge are carried out to measure the capacity and rate capability of the Li-Mn spinel. The capacity shows a maximum value of
when the molar ratio of LiOH/K-Birnessite is 0.8 and decreases with the increase of the ratio. However the rate capability is improved with the increase of the ratio due to the reduction of the particle size.