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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 15, Issue 6 - Dec 1971
Volume 15, Issue 5 - Oct 1971
Volume 15, Issue 4 - Aug 1971
Volume 15, Issue 3 - Jun 1971
Volume 15, Issue 2 - Apr 1971
Volume 15, Issue 1 - Feb 1971
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Statistical Thermodynamical Properties and Adsorption Characteristics of Heavy Water
Chang-Hyun Jho ; Hyungsuk Park ; Seihun Chang ;
Journal of the Korean Chemical Society, volume 15, issue 6, 1971, Pages 285~293
The statistical thermodynamical properties of heavy water are calculated according to the transient state theory of significant liquid structure. The calculated values are shown to be in good agreement with the observed ones. The grand canonical ensemble partition function for the adsorbed phase of heavy water on graphite surface is derived using the theory. The adsorption isotherm, the surface pressure, the molar entropy and the molar internal energy for the adsorbed phase and then the molar heat of adsorption are calculated according to the derived partition function. The thermodynamic properties of the adsorbed water are also calculated and the results are compared with those of heavy water and discussed in view of the experimentally observed phenomena.
Kinitics of Thixotropy of Aqueous Bentonite Suspension
Kisoon Park ; Taikyue Ree ;
Journal of the Korean Chemical Society, volume 15, issue 6, 1971, Pages 293~303
The theological properties of aqueous suspensions of Black Hills bentonite were measured by using a Couette-type viscometer. Three kinds of flow units in aqueous bentonite suspension were postulated. Each has a different average relaxation time, one Newtonian. One of the non-Newtonian types is thixotropic, and the other is non-thixotropic. The thixotropic non-Newtonian unit is transformed to a Newtonian unit by shear stress. If the stress is relieved, the transformed unit returns to its original state. Two flow equations were derived by introducing chemical kinetics consideration for such a transition into the generalized theory of viscous flow. One equation describes the "upcurve," a diagram of rate of sheat versus shear stress, obtained by increasing the rate of shear, and the other relates to the "downcurve" obtained by decreasing the shear rate. The equations satisfactorilly describe the experimental thixotropic hysteresis of bentonite suspensions. The equations also were successfully applied to the flow curves of the suspensions containing various amounts of monovalent electrolyte (KCI).
Ettect of Electrolytes on Flow Properties of Aqueous Bentonite Suspension
Kisoon Park ; Taikyue Ree ; Henry Eyring ;
Journal of the Korean Chemical Society, volume 15, issue 6, 1971, Pages 303~312
Dependence of the flow behavior of aqueous suspension of Black Hills bentonite on the concentration and the types of electrolytes was stydied. The flow properties were measured with a Couette-type totational viscometer. On addition of monovalent cations, the apparent viscosity determined from the reproducible flow curves (shear rate vs. shear stress) decreased followed by a rise as the ionic concentration further increased. Addition of multivalent cations (di- and tri-) resulted in the viscosity which increased to a maximum then decreased to a constant value. Anions of different chatges produced essentially the same relationship between viscosity and electrolyte concentration. The flow behavior of the electrolyte-containing suspensions was rationalized in terms of the Derjaguin-Landau-Verwey-Overbeek theory of colloidal stability and the generalized theory of viscosity.
The Complexes of Iodine with Ortho-Substituted Anilines in Carbon Tetrachloride
Bu Yong Lee ; Sang Up Choi ;
Journal of the Korean Chemical Society, volume 15, issue 6, 1971, Pages 312~317
The interactions of aniline, o-toluidine, o-ethylaniline and o-chloroaniline with iodine in carbon tetrachloride solution have been examined through spectrophotometric measurements. The results indicate that both aniline and the o-substituted anilines examined form one-to-one complexes with I2in solution. The formation constants of the complexes measured at room temperature are 12.8, 9.31, 3.15 and 0.576 l
, respectively. Comparison of these results with previous experimental results indicates that the relative stabilities of the
-amine complexes decrease in the following order: $C_6H_5N(C_2H_5)_2 >C_6H_5N(CH_3)_2 >C_6H_5NH_2 >o-CH_3C_6H_4NH_2 >o-C_2H_5C_6H_4NH_2 >o-ClC_6H_4NH_2$. This may support the conclusion that the relative stabilities of these complexes are explained by the inductive effect and steric hindrance of the substituents.
Reactions of Trimethylsilyldiphenylphosphine with Isocyanates
Song Yoon Han ; Tae Jin Min ; Dong Yul Lee ; Il Kyu Lee ;
Journal of the Korean Chemical Society, volume 15, issue 6, 1971, Pages 318~323
Reactions of trimethylsilyldiphenylphosphine with phenylisocyanate and ethylisocyanate were studied at various temperatures for 3 days. Trimethylsilyldiphenylphosphine gave cyclic dimer, cyclic trimer and diphenylcarbodiimide from phenylisocyanate, but gave cyclic trimer, triethylisocyanurate, only from ethylisocyanate. In these reactions, it is suggested that trimethylsilyldiphenylphosphine was used to be an effective catalyst for cyclization of isocyanates.
Anodic Oxidation of Iodate to Periodate by Lead Peroxide Anode
Chong Woo Nam ; Hak Joon Kim ;
Journal of the Korean Chemical Society, volume 15, issue 6, 1971, Pages 324~329
In order to evaluate the mechanism of electrolytic oxidation of iodate and to determine the optimum conditions for the electrolysis, studies were made using the cells without diaphragm and the lead peroxide anode. Results are summarized as followings: 1) Current density vs. anode potential curve by lead peroxide electrode had the different limiting current densities from platinum electrode and was more positive than platinum electrode. 2) Additions of potassium bichromate in the electrolyte contribute to maintain high current efficiency. 3) In the acid and alkaline regions, the current efficiencies decreased by reduction of iodate and discharge of hydroxyl ion, so maximum current efficiency was shown at pH 7. 4) Higher current density lowered the current efficiency in the region of 60-80% conversion of iodate. 5) Influence of the conversion on current efficiency in the region of 60-80% conversion of iodate.
Combustibility Improving Effect of Organometallic Salt for Fuel Oil
Yong Shik Kang ;
Journal of the Korean Chemical Society, volume 15, issue 6, 1971, Pages 330~347
Catalytic effects of metallic salts on the combustion of diesel fuel oil have been studied. In the case of organometallic salt, the active species are the metallic oxides resulted from combustion of the salts. The oxides act only on the residual solid carbon produced from the fuel oil combustion. The catalytic activity can be explained with the semiconductor theory just as in the case of the gas phase reaction. The chemical rate constant of the combustion of carbon, the soot from diesel fuel oil, is found to be
. By addition of metallic oxides, the rate constant increases remarkably. This work has substantiated the belief that the effect of the metallic salts on the fuel oil combustion can conveniently be studied by checking directly the effect of the corresponding metallic oxide on the soot carbon.
Study on the Charging Characteristics of a Sealed Type Ni-Cd Cell
Yung Woo Park ; Chai Won Kim ; Mu Shik Jhon ;
Journal of the Korean Chemical Society, volume 15, issue 6, 1971, Pages 347~352
The variations of the positive and negative electrode potentials, and of internal pressure were measured during the charge of the sealed type Ni-Cd cell. Both polarization characteristics of a paste type Cd-electrode as a gas diffusion electrode in 30% KOH solution and the effects of active carbon electrode as an oxygen consuming auxiliary electrode of the Ni-Cd cell on the charging characteristics of the cell were studied. Peak voltage at the end of charge of the cell is ascribed to the peak at the negative electrode potential, which is due to the concentration polarization by the lack of
ion and oxygen concentration. And the recovery of the negative electrode potential is resulted from depolarization by the increasing diffusion limiting current density with the increasing oxygen pressure. The active carbon electrode was effective as an oxygen consuming auxiliary electrode. The internal pressure of the cell could be maintained below 200mmHg even at one hour rate charge and overcharge by the use of active carbon electrode as an auxiliary electrode.
Interactions between Dimethylsulfoxide and Some Organic Molecules
Si-Joong Kim ; Doo-Soon Shin ;
Journal of the Korean Chemical Society, volume 15, issue 6, 1971, Pages 352~358
The interaction between dimethylsulfoxide molecules and some organic molecules, i.e.nitrobenzene, m-dinitrobenzene, o-dinitrobenzene, 1,3,5-trinitrobenzene, m-xylene, mesitylene, bibenzyl, biphenyl, o-phenanthrene, naphthalene, has been studied. The organic molecules exhibit negative deviation from Raoult's law due to the formation of the charge transfer complexes with dimethylsulfoxide. The stability constants of the complexes were determined spectrophotometrically, and also some thermodynamic functions were calculated. The binding energies of the complexes appear in the range of -1 ∼ -4 kcal/mole. The stability depends on the polarity and basicity of the solvent used.
MO Theoretical Studies on Organic Accelerators of Vulcanization
Ikchoon Lee ;
Journal of the Korean Chemical Society, volume 15, issue 6, 1971, Pages 359~366
The extended Huckel calculations on five organic accelerators of vulcanization have been carried out. Various MO quantities e.g., electron populations and AO coefficients, are used to explain accelerator reactivity of the compounds. Results of these analyses lead us to support free radical mechanism of acceleration in vulcanization.
The Separation and Analysis of Babbitt Metal by the Cation Exchange Chromatographic Method
Sun Tae Kim ; Kee Won Cha ; Kee Chae Park ;
Journal of the Korean Chemical Society, volume 15, issue 6, 1971, Pages 366~369
The cation exchange chromatographic method for the analysis of Babbitt metal has been studied. The quantitative separation of the mixture of Sb, Cu, Pb, and Sn ions has been obtained by elution, through 5cm column of resin, Rexyn 101 (Na form, 100~200 mesh), using 0.1 M NaCl solution for Sb, pH 4.5 and pH 7 solution of 0.01 M Na-Citrate + 0.1 M
for Cu and Pb, and 2NHCl solution for Sn as eluent.
The Variation of Radiocarbon-14 Content in the Atmosphere
Kyung Rin Yang ;
Journal of the Korean Chemical Society, volume 15, issue 6, 1971, Pages 370~377
The Carbon-14 content in surface air at Seoul, Korea, was measured from February 1970 to August 1971 and a Larix Leptolepis, Gordon tree (Ip-Gal Namu) grown at Kwang-Nung, Kyunggi-Do, Korea, having 37 growth rings, was assayde for
. From the results of the surface air study, it was calculated that during the above period the inventory of excess
in the atmosphere decreased with a half-time of 4.6 years. The overall yearly decrease was also checked. The tree-ring study showed that the tree's atmosphere was affected by
from nuclear tests after 1956. In one study, atmospheric
samples were collected bi-monthly by the absorption of
in alkaline hydroxide solution. In the other, 5 year annual growth rings were assayed for radiocarbon. For the radioactivity measurement, carbon atoms in samples were converted to carbon atoms of benzene. The resulting benzene was taken as primary solvent for liquid scintillation counting.
Spectrophotometric Study on the Complex of the Copper by 8-(p-Ethylbenzenesulfonamido) quinoline
Heung Lark Lee ; Yung Kyu Park ; Chul Heui Lee ;
Journal of the Korean Chemical Society, volume 15, issue 6, 1971, Pages 378~384
A new analytical reagent 8-(p-ethylbenzenesulfonamido)quinoline(EBSQ) has been synthesized, and identified its structure. EBSQ forms copper chloroform-soluble complex in a basic solution (pH = 7.5∼10.5). The other optimum conditions for the spectrophotometric study of Cu-EBSQ have been established at 380
. Beer's law is followed in the concentration range of 0~44.5
per 10 ml of chloroform. The composition of complex has been found to be
and the over-all instability constant is calculated to be
. The absorption coefficient of the