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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 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
Selecting the target year
Field Effect Transistors for Biomedical Application
Sohn, Young-Soo ;
Applied Chemistry for Engineering, volume 24, issue 1, 2013, Pages 1~9
As the medical paradigm is changing from disease treatment to disease prevention and an early diagonosis, the demand to develop techniques for the detection of minute concentrations of biomolecules is increasing. Among the various techniques to sense the minute concentration of biomolecules, the biosensors utilizing the matured semiconductor techniques are presented here. To understand such biosensors, the structure and working principle of a MOSFET (Metal-oxide-semiconductor field-effect transistor) which is the basic semiconductor device is firstly introduced, and then the ISFET (Ion sensitive FET), BioFET (Biologically modified FET), Nanowire FET, and IFET (Ionic FET) are introduced, and their applications to biomedical fields are discussed.
Non Conventional Energy Upgrading Process Technology
Kim, Yong Heon ; Bae, Ji Han ;
Applied Chemistry for Engineering, volume 24, issue 1, 2013, Pages 10~17
Heavy oil residue upgrading process was being used in conventional refinery process. Recently, as the importance of non conventional energy development is growing up, the commercial projects of heavy oil upgrading are getting more active than before. For having competitive business model in the resource competition, non conventional energy development should be considered as an important business strategy. In developing oil sands, extra heavy oil, and shale gas, canadian oil sands and extra heavy oil have great importance in substitution of conventional oil consumption. In oil sands development, the bitumen, which is extracted from oil sands, has great value after upgrading or refining process. Similar process is being used current conventional refinery process. The bitumen is highly viscous hydrocarbon. This bitumen includes impurities which can not be treated in conventional refinery process. As this reason, specified process is needed in bitumen or extra heavy oil upgrading process. Moreover, there will be additional specified facilities in the process of production, transportation and marketing. In oil sands, there are various kinds of commercial upgrading process. Extraction, dilution, coking and cracking method were being used commercially.
Physicochemical Characteristics of Collagen Peptide from Flatfish Skin
Jang, Boo-Sik ; Lee, Mi-Jin ; Jeong, Noh-Hee ; Kim, Tae-Young ;
Applied Chemistry for Engineering, volume 24, issue 1, 2013, Pages 18~23
In this research, the collagen peptide powder from flatfish skin (FSCP) was prepared and compared with commercial collagen peptide powder from tilapia scale (TSCP) in the aspect of physiochemical property. The physical property and nutritional components of FSCP appeared almost similarly to those of TSCP, and also in calorie. No differences in calorie between FSCP and TSCP. Amino acid contents of FSCP for example, aspartic acid, serine, histidine, tyrosine and methionine were higher than those of TSCP. In contrast, the hydroxyproline, proline, alanine contents in FSCP were lower than those in TSCP. Especially, the content of essential amino acid of FSCP, which was 22.74%, was higher than that of TSCP evaluated as 13.64%. In the distribution of molecular weight, FSCP was 1000 Da, which showed a comparatively low distribution compared with TSCP, and in emulsion property and stability both FSCP and TSCP showed an excellent trend.
Studies of Adsorption on the Anionic Surface of
by Cationic Modified Starches
Han, DongSung ; Kim, YuMi ; Kim, HanYoung ; Chi, GyeongYup ; Cho, InShik ; Kim, JongDuk ;
Applied Chemistry for Engineering, volume 24, issue 1, 2013, Pages 24~30
The adsorption characteristics of cationic starches and starch-oligomers were investigated using the quartz crystal microbalance with dissipation monitoring (QCM-D). The adsorbed amount of modified starches was higher than that of cationic surfactants such as
trimethylammonium bromide. Cationic starches did not show the tendency depending on the degree of cationic substitution and molecular weight. On the other hand, the softness of the adsorption layer increased with the molecular weight of cationic starches in a viscoelasticity terms. During the adsorption/desorption steps, the amount of adsorbed cationic surfactants was 4~9 times. On the other hand, the difference in the amount of adsorption of all the
grafted cationic starches was just 0~50%. In addition, the rigidity of the adsorption layer of cationic surfactant in the desorption step decreased, while, that of cationic starches increased at the same condition.
Texturing Multi-crystalline Silicon for Solar Cell
Ihm, DaeWoo ; Lee, Chang Joon ; Suh, SangHyuk ;
Applied Chemistry for Engineering, volume 24, issue 1, 2013, Pages 31~37
Lowering surface reflectance of Si wafers by texturization is one of the most important processes for improving the efficiency of Si solar cells. This paper presents the results on the effect of texturing using acidic solution mixtures containing the catalytic agents to moderate etching rates on the surface morphology of mc-Si wafer as well as on the performance parameters of solar cell. It was found that the treatment of contaminated crystalline silicon wafer with
solution before the texturing helps the removal of organic contaminants due to its oxidizing properties and thereby allows the formation of nucleation centers for texturing. This treatment combined with the use of a catalytic agent such as phosphoric acid improved the effects of the texturing effects. This reduced the reflectance of the surface, thereby increased the short circuit current and the conversion efficiency of the solar cell. Employing this technique, we were able to fabricate mc-Si solar cell of 16.4% conversion efficiency with anti-reflective (AR) coating of silicon nitride film using plasma-enhanced chemical vapor deposition (PECVD) and Si wafers can be texturized in a short time.
Treatment of Wastewater Containing Ethanolamine in Secondary System of Nuclear Power Plant
Lee, Han Chul ;
Applied Chemistry for Engineering, volume 24, issue 1, 2013, Pages 38~43
ETA (ethanolamine), a pH control agent, has been used as an ammonia substitute in the secondary system of nuclear power plants since 2001. It is impossible to remove ETA from the wastewater treatment system in the nuclear power plant operating currently, because it is the non-biodegradable organics in terms of the environmental. The optimum process and chemicals for the removal of chemical oxygen demand (COD) & N with the field sample were investigated. More than 95% of Ammonium ions, contained much in wastewater, was removed with a diffused aeration system. COD could be removed over 90% through the process that includes the oxidation with mixed peroxidants (sodium persulfate/sodium percarbonate) followed by the physicochemical treatment with coagulants.
Synthesis of Tungsten Doped Vanadium Dioxide and Its Thermochromic Property Studies
Hwang, Kyung-Jun ; Jo, Cho Won ; Yoo, Jung Whan ;
Applied Chemistry for Engineering, volume 24, issue 1, 2013, Pages 44~48
In this work, we have prepared tungsten doped vanadium oxide (
) particles with a low phase transition temperature.
particles were synthesized via thermolysis method using vanadyl (IV) sulfate and ammonium bicarbonate as precursors. The structure and thermochromic property of synthesized
particles were investigated by FE-SEM, EDS, XRD, XPS, and DSC analysis. The prepared
showed a nearly platy morphology, which indicates that the tungsten was successfully doped in the crystal lattices of
nanoparticles with the size of 60 nm exhibited a monoclinic crystal structure and its chemical composition and surface state were also likely to be close to that of
. In addition, the phase transition temperature of
, which was approximately
lower than that of pure
), indicating that the prepared sample had a good reversible thermochromic stability.
Enhancement of Selective Removal of Nitrate Ions from a Mixture of Anions Using a Carbon Electrode Coated with Ion-exchange Resin Powder
Yeo, Jin-Hee ; Choi, Jae-Hwan ;
Applied Chemistry for Engineering, volume 24, issue 1, 2013, Pages 49~54
We fabricated a composite carbon electrode to remove nitrate ions selectively from a mixed solution of anions. The electrode was fabricated by coating the surface of a carbon electrode with the nitrate-selective anion exchange resin (BHP55, Bonlite Co.) powder. We performed capacitive deionization (CDI) experiments on a mixed solution containing chloride, nitrate, and sulfate ions using a BHP55 cell constructed with the fabricated electrode. The removal of nitrate ions in the BHP55 cell was compared to that of a membrane capacitive deionization (MCDI) cell constructed with ion exchange membranes. The total quantity of ions adsorbed in BHP55 cell was
, which is 31% greater than that of MCDI cell. In addition, the number of nitrate adsorption in the BHP55 cell was
(42% of total adsorption), 2.1 times greater than the adsorption in the MCDI cell. The results showed that the fabricated composite carbon electrode is very effective in the selective removal of nitrate ions from a mixed solution of anions.
Polymerization of Ethylene over
Catalyst Supported on Montmorillonite
Ahn, Sung-Hyun ; Lee, Sung-Ho ; Choi, Moo-Seok ; Im, Jun-Seop ; Sheikh, Rizwan ; Cho, Deug-Hee ; Park, Yeung-Ho ;
Applied Chemistry for Engineering, volume 24, issue 1, 2013, Pages 55~61
Heterogeneous metallocene catalysts supported on montmorillonite (MMT), [
+ MAO/MMT], were prepared with three different methods of immobilization and tested for ethylene polymerization. The heterogeneous catalysts immobilized on organo clay (30B-MMT) showed the higher metal loading and polymerization activity than those immobilized on natural clay
. These results suggest that the hydroxyl groups of organo clay interlayers react with the MAO and catalyst through the chemical bond. The metallocene catalyst supported directly on MMT showed lower activity for ethylene polymerization compared to the homogeneous systems, while MMT/MAO/
, catalysts treated with MAO before impregnation, showed a higher activity. The polymers obtained from MMT-supported catalysts have higher melting point, molecular weight and molecular weight distributions than those of homogeneous catalysts. The polymer particles with increasing significant size. Ethylene polymerization over 30B-MMT/MAO/
catalyst was also performed varying the process variables to optimize the process conditions.
Physicochemical Characteristics of Carrot Glycoprotein
Lee, Mi-Jin ; Jang, Boo-Sik ; Jeong, Noh-Hee ;
Applied Chemistry for Engineering, volume 24, issue 1, 2013, Pages 62~66
This study was performed to investigate the physicochemical characteristics of glycoprotein extracted from carrot. We manufactured glycoprotein using natural vegetable raw materials carrots, and then analyzed it's physicochemical properties. The results showed that the nutritional composition of carrot glycoprotein (CG) consisted of 2.35% carbohydrate and 94.2% glycoprotein. There were small amounts of hydroxyproline and glycine known as characteristics of collagen peptide in the amino acid of CG, but there were large amount of glutamic acid and aspartic acid involved in the metabolism of glucose and fat. The calories of CG was 342.1 kcal/100 g and the molecular weight appeared less than 594 Da average molecular weight distribution.
Regeneration of Waste Ferric Chloride Etchant Using HCl and
Lee, Hoyeon ; Ahn, Eunsaem ; Park, Changhyun ; Tak, Yongsug ;
Applied Chemistry for Engineering, volume 24, issue 1, 2013, Pages 67~71
has been used as an etchant for metal etching such as Fe, Cu, and Al. In the process of metal etching,
is reducted to
and the etching rate becomes slow and etching efficiency decreased. Waste
etchant needs to be regenerated because of its toxicity and treatment cost. In this work, HCl was initially mixed with the waste
and then, strong oxidants, such as
, were added into the mixed solution to regenerate the waste etchant. During successive etching and regeneration processes, oxygen-reduction potential (ORP) was continuously measured and the relationship between ORP and etching capability was investigated. Regenerated etchant using a two vol% HCl of the total etchant volume and a very small amount of
was very effective in recovering etching capability. During the etching-regeneration process, the same oxygen-reduction potential variation cannot be repeated every cycle since concentrations of
ions were continuously changed. It suggested that the control of etching-regeneration process based on the etching time becomes more efficient than that of the process based on oxygen reduction potential changes.
Eco-friendly Esterification of Dicarboxylic Acid Using Recovered Boric Acid
Park, Jun-Seong ; Woo, Je-Wan ;
Applied Chemistry for Engineering, volume 24, issue 1, 2013, Pages 72~76
In this study, the boric acid which is a by-product in the esterification process to obtain norbornene diester derivatives was recovered, and then its reusability for esterification of norbornene was investigated. Four types of trialkyl borate (tributyl borate, tripentyl borate, and triisopentyl borate, trihexyl borate) were synthesized through the esterification with boric acid and four types of alcohol. Then, diester derivatives were synthesized by esterification with the synthesized trialkyl borate and norbornene dicarboxylic acid. The conversion of norbornene dicarboxylic acid is 89.50~99.31%. The boric acid which is a by-product in the esterification were recovered with NaCl salt and used for synthesizing trialkyl borate. The recovery rate was 92.43~99.35 %. When the recovered trialkyl borate was used in esterification, there are little losses of the yield. Since boric acid which is a major by-product is able to be recovered, the process is expected to be a clean technology to prevent an environmental pollution by the emission of chemical compounds.
Effect of Halogen-phosphours Flame Retardant Content on Properties of Rigid Polyurethane Foam
Kim, Chang Bum ; Kim, Sang Bum ;
Applied Chemistry for Engineering, volume 24, issue 1, 2013, Pages 77~81
In this study, the effect of halogen-phosphorus flame retardant on the flame retardancy and the mechanical properties of the rigid polyurethane foam (PUF) were studied. The reduced compressive strength and glass transition temperature of PUF decreased as contents of the flame retardant increased. After aging, the reduced compressive strength and glass transition temperature of PUF increased due to the reaction of unreacted isocyanate. The cell morphology effect of these flame retardants was also investigated using scanning electron microscope. The results of TCEP added to PUF showed an unstable and uneven cell morphology, leading to the increase of in thermal conductivity. The flame retardancy of vacuum aged PUF decreased compared to that of fresh PUF.
Preparation of Palladium on Carbon for Hydrogenation Catalyst Using [Bmim][
] as an Effective Solvent
Tae, Hyunman ; Jeon, Seung Hye ; Yoo, Kye Sang ;
Applied Chemistry for Engineering, volume 24, issue 1, 2013, Pages 82~86
Palladium particles were synthesized with 1-buthyl-3-methylimidazolium trifluoromethanesulfonate ([Bmim][
]) as an effective solvent during the synthesis. The morphology of the particles was affected by the concentration of [Bmim][
]. Furthermore, the palladium on carbon powder was prepared with various [Bmim][
] concentrations and calcinations temperatures as a catalyst for hexafluoropropylene hydrogenation. Catalytic activity was varied by both conditions significantly. Under the identical condition, the catalyst prepared by the same mole ratio of [Bmim][
] and palladium, and calcined at
was the most active in this reaction.
Degradation of Pesticides in Wastewater Using Plasma Process Coupled with Photocatalyst
Jang, Doo Il ; Kim, Kil-Seong ; Hyun, Young Jin ;
Applied Chemistry for Engineering, volume 24, issue 1, 2013, Pages 87~92
Nonthermal plasma hybridized with photocatalysts is proven to be an effective tool to degrade toxic organics in wastewater. In this study, a specially designed dielectric barrier discharge (DBD) plasma system combined with photocatalysts was applied to decompose pestiticides such as dichlorovos, carbofuran and methidathon, which are frequently used in the golf courses and the orange plantations. The degradations of the pesticides in single and coupled systems were evaluated. The single system was used with ozone plasma which consisted of electrons, radicals, ions produced by oxygen gas and air, with and without ultra-violet (UV) irradiation, respectively. The coupled systems utilized the air-derived ozone plasma combined with zinc oxide, titanium dioxide and graphite oxide photocatalyst activated by UV. The graphite oxide was synthesized by a modified Hummer's method and characterized using FTIR spectrometer. It was elucidated that the plasma reaction with graphite oxide (0.01 g/L) brought about almost 100% of degradation degrees for dichlorovos and carbofuran in 60 min, as compared with the performances showed by no catalyst condition. The photocatalyst-hybridized plasma in the presence of UV irradiation was proven to be an effective alternative for degrading pesticides.
Synthesis and Photovoltaic Properties of Conducting Polymers Based on Phenothiazine
Yoo, Han-Sol ; Park, Yong-Sung ;
Applied Chemistry for Engineering, volume 24, issue 1, 2013, Pages 93~98
In this paper, four conducting polymers (poly[(N-butyl-phenothiazine)-sulfide] (PBPS), poly[(N-hexyl-phenothiazine)-sulfide] (PHPS), poly[(N-decyl-phenothiazine)-sulfide] (PDPS), and poly[(N-(2-ethylhexyl)-phenothiazine)-sulfide] (PEHPS)) were synthesized with a high temperature and high pressure reaction. The structures of synthesized polymers were confirmed by
and characterized by UV-Vis, cyclic voltammetry, and GPC. From the UV-Vis absorption spectra, the
values of PBPS, PHPS, PDPS, and PEHPS were 338, 341, 340, and 334 nm, respectively and their optical band gaps were 3.11, 3.13, 3.16, and 3.05 eV, respectively. To evaluate the feasible applicability as a photovoltaic cell, the devices composed of for example, ITO/PEDOT : PSS/polymer (PBPS, PDPS) :
(1 : 3, w/w)/
/Ba/Al were fabricated using the blends of the PBPS and PDPS as a donor, and
as an acceptor. Then, the power conversion efficiencies (PCE) of devices were estimated as 0.076% of PBPS and 0.136% of PDPS by solar simulator.
Preparation of Enzyme Electrodes for Biofuel Cells Based on the Immobilization of Glucose Oxidase in Polyion Complex
Nguyen, Linh Thi My ; Li, Nan ; Yoon, Hyon Hee ;
Applied Chemistry for Engineering, volume 24, issue 1, 2013, Pages 99~103
An emzymatic bioanode for a glucose/oxygen biofuel cell was prepared by the sequential coating of carbon nanotube (CNT), charge transfer complex (CTC) based on tetracyanoquinodimethane (TCNQ) and tetrathiafulvalene (TTF), glucose oxidase (GOx), and polyion complex (mixture of poly-L-lysine hydrobromide and poly (sodium 4-styrenesulfonate)) on a glassy carbon electrode. A biocathode was also prepared by the sequential coating of CNT, bilirubin oxidase (BOD), 2,2'-Azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS), and polyion complex. The effect of CNT and CTC on the electrochemical performance was investigated. The biofuel cell exhibited a promising performance with maximum power densities of 3.6, 10.1, and
at 5, 20, and 200 mM of glucose concentration, respectively. The result indicates that the biofuel cell architecture prepared in this study can be used in the development of biofuel cells and biosensors.
Modification of PLA/PBAT Blends and Thermal/Mechanical Properties
Kim, Dae-Jin ; Min, Chul-Hee ; Park, Hae-Youn ; Kim, Sang-Gu ; Seo, Kwan-Ho ;
Applied Chemistry for Engineering, volume 24, issue 1, 2013, Pages 104~111
Poymer blends of two degradable aliphatic polyesters, relatively expensive material polylactic acid (PLA) and relatively inexpensive material poly(butylene adipate-co-terephthalate) (PBAT), were used in this study. Three different kinds of modifiers were used with various amounts. Diisocyanate type methylenediphenyl 4,4'-diisocyanate (MDI) and hexamethylene diisocyanate (HDI) were used as modifiers and epoxy type coupling agents also used. The melt flow index (MFI) and dynamic viscoelasticity of various compositions of PLA/PBAT blends were studied. The mechanical property and morphology with respect to the fracture surface of PLA/PBAT blends were also investigated using tensile test and field emission scanning electronic microscopy, respectively. These tests were also used to verify the compatibility of PLA/PBAT and the effect of mechanical properties due to the use of modifiers. Tensile properties of PLA/PBAT blends modified with HDI were improved remarkably.