• Proceedings of the Korean Fiber Society Conference
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• 1999.10a
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• pp.517-520
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• 1999

개질제로 1,4-cyclohexandimethanol과 dimethyl isophthalate를 사용하여, PET 규칙적인 분자쇄에 분자유동성이 적은 cyclohexane 구조와 벤젠 unit에 iso형태인 "kink"구조를 도입하여, 개질제의 함량에 따른 공중합물의 열적성질과 그에 따른 morphology를 관찰하였다.

• Proceedings of the Korean Vacuum Society Conference
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• 2001.02a
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• pp.56-56
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• 2001

• The Journal of Natural Sciences
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• v.3
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• pp.1-10
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• 1990

임계 이중 연계혼합물인 nitroethane 과 cyclohexane 혼합물의 임계온도 근처에서 전기적 감수율 (electric susceptibility)을 전기용량의 온도에 대한 변화를 측정하여 얻었다. 비선형 효과를 관측하기 위하여 자기유도 타원편광축 회전에 의한 제3차 비선형 광학감수율을 측정하여 임계지수를 구하였다. 임계지수는 0.34 였다.

• Journal of the Korean Chemical Society
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• v.59 no.4
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• pp.336-340
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• 2015

• Bulletin of the Korean Chemical Society
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• v.34 no.1
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• pp.255-258
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• 2013

• Proceedings of the Korean Vacuum Society Conference
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• 2006.08a
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• pp.87-87
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• 2006

• Bulletin of the Korean Chemical Society
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• v.30 no.9
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• pp.1956-1962
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• 2009

The binding abilities of two multidentate tripodal amine catechol ligands, cis,cis-1,3,5-tris[(2,3-dihydroxybenzylamino) aminomethyl]cyclohexane (TMACHCAT, $L^1)\;and\;N^1,N^3,N^5$-tris(2-(2,3-dihydroxybenzylamino) ethyl)cyclohexane-1,3,5-tricarboxamide (CYCOENCAT, $L^2$) with Ga(III) and In(III) have been investigated by potentiometric and spectrophotometric methods in an aqueous medium of 0.1 M KCl at 25 ${\pm}\;1\;{^{\circ}C}.$ The ligands $L^1\;and\;L^2$ formed various monomeric species $MLH_3,\;MLH_2$, MLH and ML (M = $Ga^{+3}\;and\;In^{+3}$) and showed potential to form strong encapsulated tris(catechol) type complexes. The coordination modes, binding ability and selectivity of the ligands towards Ga(III) and In(III) have been discussed with the help of experimental evidences, and supported with molecular modeling calculations.

• Analytical Science and Technology
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• v.5 no.4
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• pp.373-379
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• 1992

The pyrolysis conditions for the thermal isomerization products of pinane were carried out by the furnace type pyrolyzer and the curie-point pyrolyzer equipped with gas chromatograph and mass spectrometer. It was confirmed that curie-point type is much better furnace type, and high yield (70%) of citronellene was obtained from pinane as the main isomerization product under the best conditions by curie-point type. The optimum conditions of pyrolysis are $590^{\circ}C$ for 4 sec. and the major products were indentified as citronellene, m-Menth-6-ene, m-Menth-1-ene and 1-Methyl-4-(1-methylethylidiene) cyclohexane.

• Journal of the Korean Chemical Society
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• v.42 no.1
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• pp.22-27
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• 1998

Fluorescence quenching of coumarin 153 and coumarin 481 with N,N-dimethylaniline in various solvents was investigated. Quenching rate constants are related to diffusion-limited rate constants to some extent. It is noted that smaller discrepancy was observed between the diffusion-limited rate constant and the experimental quenching rate constant when the stick boundary condition rather than the slip boundary condition was applied for estimating the diffusion coefficients. In nonpolar solvent like cyclohexane fluorescence quenching is adequately explained by the diffusion controlled process within the experimental error, but in acetonitrile the quenching rate constant was estimated to be consistently smaller than the diffusion limited rate constant. This may suggest that fluorescence quenching of coumarin dyes be affected not only by the molecular diffusion but also by the intramoleccular process such as charge separation.

• Journal of the Korean Chemical Society
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• v.35 no.5
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• pp.560-568
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• 1991

The simultaneous determination method which simply determined regulated pesticides was investigated. Sample was extracted with acetone-methanol and partitioned with methylene chloride after addition of saturated NaCl solution. Entract was purified by Bio-Beads S-X3 column using cyclohexane-methylene chloride (1 : 1) as eluate. The determination of pesticides was performed by BP-1 capillary column gas chromatography using ECD and NPD. The average recoveries of pesticides in rice and soy fbean were over 83% and 81%, respectively. It was possible to detect pesticides in rice up to 0.002 ppm by $\alpha-BHC$ and up to 0.05 ppm by carbaryl and in soy bean up to 0.01 ppm by ${\alpha}$-BHC and up to 0.3 ppm by carbaryl.