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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Chemical Society
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Journal DOI :
Korean Chemical Society
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Volume & Issues
Volume 56, Issue 6 - Dec 2012
Volume 56, Issue 5 - Oct 2012
Volume 56, Issue 4 - Aug 2012
Volume 56, Issue 3 - Jun 2012
Volume 56, Issue 2 - Apr 2012
Volume 56, Issue 1 - Feb 2012
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The Radial Distribution Functions of the Scaled OSS2 Water
Lee, Song Hi ;
Journal of the Korean Chemical Society, volume 56, issue 6, 2012, Pages 669~672
DOI : 10.5012/jkcs.2012.56.6.669
Classical molecular dynamics (MD) simulations using a scaled OSS2 potential originally derived from ab initio calculations are used to study the radial distribution functions of water. The original OSS2 water potential is shown to represent a glassy or an ice at ambient temperature, but the diffusion coefficient increases on increasing the temperature of the system or decreasing the density. This suggests scaling the OSS2 potential. The O-O, O-H, and H-H radial distribution functions and the corresponding coordination numbers for the scaled OSS2 potential, obtained by MD simulation, are in good agreement with the experiment results and calculations for the SPC/E water potential over a range of temperatures.
Atmospheric Effects on Corrosion of Iron in Borate Buffer Solution
Kim, Hyun-Chul ; Kim, Younkyoo ;
Journal of the Korean Chemical Society, volume 56, issue 6, 2012, Pages 673~678
DOI : 10.5012/jkcs.2012.56.6.673
Using potentiodynamic and linear polarization method, the atmospheric effect on the corrosion of iron in borate buffer solution was investigated. The corrosion of iron was heavily influenced by the degree of oxygen concentration. The supply of reduction current was increased by the reduction of dissolved oxygen, and the corrosion potential of iron was shifted to the positive side. The
ion, which was produced through the reduction of either water or oxygen, significantly increased the
ion concentration inside of the electrical double layers of iron electrode, and facilitated the adsorption of
ion on the surface of the iron electrode. The adsorption of
ion on the iron electrode can be explained either by Langmuir isotherm or by Temkin logarithmic isotherm.
Synthesis, Characterization and Biological Activities of 4-(p-Chlorophenyl)-1-(pyridin-2-yl)thiosemicarbazide and Its Metal Complexes
Hassanien, Mohammad M. ; Mortada, Wael I. ; Hassan, Ali M. ; El-Asmy, Ahmed A. ;
Journal of the Korean Chemical Society, volume 56, issue 6, 2012, Pages 679~691
DOI : 10.5012/jkcs.2012.56.6.679
New series of metal complexes of Co(II), Ni(II), Cu(II), Zn(II), Pd(II) and Pt(II) with 4-(p-chlorophenyl)-1-(pyridin-2-yl)thiosemicarbazide (HCPTS) have been synthesized and characterized by elemental analyses, magnetic moment, spectra (IR, UV-Vis,
NMR, mass and ESR) and thermal studies. The IR data suggest different coordination modes for HCPTS which behaves as a monobasic bidentate with all metal ions except Cu(II) and Zn(II) which acts as a monobasic tridentate. Based on the electronic and magnetic studies, Co(II), Cu(II), Pd(II) and Pt(II) complexes have square - planner, Ni(II) has mixed stereochemistry (tetrahedral + square planar), while Zn(II) is tetrahedral. Molar conductance in DMF solution indicates the non-ionic nature of the complexes. The ESR spectra of solid copper(II) complex show
(2.0899) > 2.0023 indicating square-planar structure and the presence of the unpaired electron in the
orbital with significant covalent bond character. The thermal stability and degradation kinetics of the ligand and its metal complexes were studied by TGA and DTA and the kinetic parameters were calculated using Coats-Redfern and Horowitz-Metzger methods. The complexes have more antibacterial activity against some bacteria than the free ligand. However, the ligand has high anticancer activities against HCT116 (human colon carcinoma cell line) and HEPG2 (human liver hepatocellular carcinoma cell line) compared with its complexes.
A Comparative Study on Adsorption Characteristics of PCBs in Transformer Oil Using Various Adsorbents
Ryoo, Keon Sang ; Hong, Yong Pyo ; Ahn, Chun Ju ;
Journal of the Korean Chemical Society, volume 56, issue 6, 2012, Pages 692~699
DOI : 10.5012/jkcs.2012.56.6.692
The aim of the present study is to explore the possibility of utilizing loess and fly ash as well as activated carbon for the adsorptive removal of PCBs in transformer oil. Here, we investigated the effect of various factors such as temperature (5, 25, 55), contact time (30 min-3 day) and adsorbent does (1, 2.5, 5, 10 g) in detail. It was found that PCBs adsorption rate from transformer oil by activated carbon is more favored than loess at the equilibrium time of 60 minutes. The equilibrium data for both activated carbon and loess is fitted well to the Freundlich isotherm model. The rate constant and activation energy of PCBs adsorption in transformer oil on each adsorbent was analyzed by fitting a kinetic model at 5, 25 and
. From the thermodynamic parameters, the PCBs adsorption process for transformer oil/activated carbon and loess system is spontaneous and endothermic in nature.
A Comparative Study on Adsorption Characteristics of Total Nitrogen and Phosphorous in Water Using Various Adsorbents
Ryoo, Keon Sang ; Choi, Jong-Ha ;
Journal of the Korean Chemical Society, volume 56, issue 6, 2012, Pages 700~705
DOI : 10.5012/jkcs.2012.56.6.700
The present study is to explore the possibility of utilizing loess and fly ash as well as activated carbon for the adsorptive removal of T-N and T-P in water. Here, we investigated adsorption efficiency and Freundlich constants k and 1/n of each adsorbent. It was found that fly ash has not adsorptive capability for both T-N and T-P in water. Adsorption of T-N from water by loess has not occurred, but showed that adsorption efficiency for T-P reached approximately 57.5% at equilibrium time of 24 hr and room temperature. Activated carbon was shown to be an effective adsorbent for adsorption of T-N from water. Freundlich constant 1/n value of activated carbon represented that adsorptive capability of activated carbon is almost equivalent to loess.
Microwave Mediated Protection of Hindered Phenols and Alcohols
Pothi, Tejas ; Dawange, Mahesh ; Chavan, Kamlesh ; Sharma, Rajiv ; Deka, Nabajyoti ;
Journal of the Korean Chemical Society, volume 56, issue 6, 2012, Pages 706~711
DOI : 10.5012/jkcs.2012.56.6.706
Hindered phenols and alcohols were protected as their corresponding ethers using different alkylating agents in presence of KOH/DMSO under microwave irradiation.
A Simple and Clean Synthesis of Polysubstituted 2,6-Dicyanoanilines Catalyzed by KF/alumina
Jain, Shubha ; Keshwal, Balwant S. ; Rajguru, Deepika ; Bhagwat, Vasant W. ;
Journal of the Korean Chemical Society, volume 56, issue 6, 2012, Pages 712~715
DOI : 10.5012/jkcs.2012.56.6.712
A simple and clean synthesis of polysubstituted 2,6-dicyanoanilines has been developed via the reaction of arylidenemalonodinitriles with 1-arylethylidenemalonodinitriles in ethanol catalyzed by KF/alumina. Use of non-hazardous solid base as a catalyst, operational simplicity and improved product yields are the key advantages of the present protocol.
as an Efficient Catalyst for Diazotization and Diazo Coupling Reactions
Rahimizadeh, Mohammad ; Eshghi, Hossein ; Shiri, Ali ; Ghadamyari, Zohreh ; Matin, Maryam M. ; Oroojalian, Fatemeh ; Pordeli, Parvaneh ;
Journal of the Korean Chemical Society, volume 56, issue 6, 2012, Pages 716~719
DOI : 10.5012/jkcs.2012.56.6.716
Diazo coupling reactions of aromatic amines with 2-naphthol in a green, efficient and easy procedure is described. Ferric hydrogensulfate catalyses this reaction in water at room temperature and short reaction time with high yields. The antibacterial activities of the synthesized compounds against four pathogenic bacteria are also investigated.
Micellar Catalysis on 1,10-Phenanthroline Promoted Chromic Acid Oxidation of Ethane-1,2-diol in Aqueous Media at Room Temperature
Ghosh, Sumanta K. ; Saha, Rumpa ; Ghosh, Aniruddha ; Basu, Ankita ; Mukherjee, Kakali ; Saha, Indrajit ; Saha, Bidyut ;
Journal of the Korean Chemical Society, volume 56, issue 6, 2012, Pages 720~724
DOI : 10.5012/jkcs.2012.56.6.720
Under pseudo-first order conditions, the monomeric species of Cr(VI) was found to be kinetically active in the absence of phenanthroline (phen) whereas in the phen-promoted path, the Cr(VI)-phen complex undergoes a nucleophilic attack by etane-1,2-diol to form a ternary complex which subsequently experience a redox decomposition leading to hydroxy ethanal and Cr(III)-phen complex. The effect of the cationic surfactant (CPC), anionic surfactant (SDS) and neutral surfactant (TX-100) on the unpromoted and phen-promoted path have been studied. Micellar effects have been explained by considering the preferential partitioning of reactants between the micellar and aqueous phase. Combination of TX-100 and phenanthroline will be the ideal for chromic acid oxidation of ethane-1,2-diol in aqueous media.
Optophysical Properties of Hydrogel Ophthalmic Lenses Containing Gallate Group
Park, Se-Young ; Sung, A-Young ;
Journal of the Korean Chemical Society, volume 56, issue 6, 2012, Pages 725~730
DOI : 10.5012/jkcs.2012.56.6.725
HEMA (2-hydroxyethyl methacrylate), EGDMA (ethylene glycol dimethacrylate; cross-linker), MMA (methyl methacrylate) and AA (acrylic acid) were copolymerized with ethyl gallate and propyl gallate as additives in the presence of AIBN (2,2'-azobisisobutyronitrile; initiator). The measurement of physical properties of the produced copolymers exhibited that refractive index, water content, visible transmittance, tensile strength, and contact angle were in the range of 1.433-1.435, 38.71-38.99%, 85.4-88.8%, 0.2468-0.2740 kgf and
, respectively. The transmittances of the copolymers were measured to be in the range of 49.0-7.4% and 71.0-43.4% for UV-B and UV-A, respectively, indicating that the copolymers have UV-blocking effect. The produced copolymers containing ethyl gallate and propyl gallate satisfied the basic physical properties required for the fabrication of hydrogel contact lenses. The copolymers showed an increase of wettability and UV-blocking effects while having no significant change in water content compared to the gallate-free copolymers.
Science High School Students' Understandings on Chemical Cells : In Relation to Chemical Equilibrium from the Microscopic Viewpoint at Molecular Level
Kim, Hyun-Jung ; Hong, Hun-Gi ;
Journal of the Korean Chemical Society, volume 56, issue 6, 2012, Pages 731~738
DOI : 10.5012/jkcs.2012.56.6.731
The purpose of this study is to analyze the understandings of science high school students on the conception of chemical cell in relation to chemical equilibrium from the microscopic viewpoint at molecular level through questionnaires and follow-up interviews. The results show that they have high understandings on the chemical equilibrium states in the electrochemical cell and on the redox reaction taking place simultaneously when a metal electrode is immersed in the metal ion solution. However, they do not fully comprehend the development of electrical potential difference, electron movement, electrode potential measurement in the half-cells, and calculation of the net cell voltage between anode and cathode in the chemical cell because of difficulties in the microscopic understanding the interaction on the interface at the electrode and the electrolyte solution.
Analysis of the Level of Cognitive Demands about Concepts of Ionic Compounds and Molecule on Science 2 Textbooks in Junior High School (II)
Kang, Soonhee ; Bang, Dami ; Kim, Sun-Jung ;
Journal of the Korean Chemical Society, volume 56, issue 6, 2012, Pages 739~750
DOI : 10.5012/jkcs.2012.56.6.739
The purpose of this study is to analyze the cognitive demands level of the description about 'pure substance and mixture compound', 'ionic compound', 'molecule' on the 'science2' textbooks by the 2007 revised curriculum. The three types of Curriculum Analysis Taxonomy have been used to analyze the cognitive demands level of those contents on the 6 kinds of 'science2' textbooks. The first, the cognitive demand level about 'pure substance and mixture compound' on many textbooks is a late concrete operational stage because of class inclusion and hierarchical classification. And the descriptions as 'pure substance is conserved even when mixed with other pure substance' is a early formal operational stage. The second, the cognitive demand level about 'ionic compound' and 'molecule' is a early formal operational stage, because of "Formal modeling is the indirect interpretation of reality by deductive comparison from a postulated system with its own rules" and "Atoms have a structure". The third, the terms as 'ionic bonding', 'ionic compound', 'chemical formula', 'covalent bonding', 'covalent compound', and 'molecular formula' have been used on many 'science2' textbooks. Those terms would be used later on 'chemistry I' and 'chemistry II' in senior high school but not even 'science3' and 'science'.
Analyzing Career Paths and College Life Plans of Department of Chemistry Education Students in Teacher's College Examined by Their Roadmaps
Park, Jongseok ; Bae, Sungwoo ;
Journal of the Korean Chemical Society, volume 56, issue 6, 2012, Pages 751~758
DOI : 10.5012/jkcs.2012.56.6.751
In this study, we analyzed career paths and college life plans of department of chemistry education students in teacher's college examined by their roadmaps. We let students make their roadmaps and analyzed them using the PASW 18 program. There were significant differences on gender in their career paths, learning English, traveling and volunteer activity. Female students for passing the MEET(Medical Education Eligibility Test) or DEET(Dental Education Eligibility Test) were more interested in learning English and traveling than male students. In addition, female students were more interested in volunteer activity. And the lower year students, the more interested in medical paths, learning English, traveling, getting good grades, exchange student program and scholarship. On the other hand the higher year students, the more interested in group study or E-learning. Then significant differences were in learning English, traveling and getting good grades by students's career paths. Students who wish to pass the MEET or DEET were more interested in learning English and getting good grades. Those two factors were essential in passing the MEET or DEET. Students who did not specified their career paths had more traveling plans than other students for setting their directions of careers. These results show that freshman and female students don't recognize the identity of teacher's college correctly. Because of reduction in the number of teacher recruitment according to decrease of students by birth rate drop, students in teacher's college are expected to continue like this trend that students look for other paths. Therefore, it is required career counseling and guidance for students who give priority practical path choices and college life plans over original characteristics of teacher's college. And it should be reconsidered the direction of chemistry education prepared the identity of teacher's college reflected in this actuality.
The Impact of the Science Writing Heuristic Approach on Students' Use of Multiple Representations in Science Writing and Students' Recognition about Multiple Representations
Nam, Jeonghee ; Park, Jiyeon ; Lee, Dongwon ;
Journal of the Korean Chemical Society, volume 56, issue 6, 2012, Pages 759~767
DOI : 10.5012/jkcs.2012.56.6.759
The purpose of this study was to examine the impact of Science Writing Heuristic (SWH) on multiple representations in students' writing and to survey experimental group students' recognition about the use of multiple representations. For this study, Participants of this study were 158 students in 7th grade. 94 students were assigned to the experimental group and 64 students were assigned to the comparative group. The experimental group showed significantly higher mean score than comparative group at utilizing multiple representation in summary writing. Interview analysis indicated that all students who participated in interviews, regardless of solid multi-modal competency, recognized that use of multiple representations with appropriate explanations enable to communicate science information persuasively.
Monte Carlo Simulation for Diffusion-influenced Reactions on Irregular Lattices
Kim, Taejun ; Kim, Hyeonghee ; Kim, Hyojoon ;
Journal of the Korean Chemical Society, volume 56, issue 6, 2012, Pages 768~771
DOI : 10.5012/jkcs.2012.56.6.768