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중학교 학생들의 과학에 대한 인지도 조사와 화학분야를 중심으로한 중학교 새 과학교과서의 분석
방효춘,이승희 덕성여자대학교 자연과학연구소 1997 자연과학 논문집 Vol.3 No.-
In this paper, chemical experiments in three kinds of middle school science textbooks based on the 6th revised curriculun were examined. Also the middle school students' conceptions for science were surveyed. The new science textbooks were organized well with more models, diagrams, and the problems which is correlated with everyday life's experiences. The middle school students consider science as an interesting subject. And they don't experience serious difficulties to learn science.
방효춘,황명진 덕성여자대학교 자연과학연구소 1996 자연과학 논문집 Vol.2 No.-
The high purity barium titanate was prepared. The influence of anion from starting materials on the crystalline form, thermal decomposition behavior and particle size distribution of barium titanyl oxalate and barium titanate was investigated. Amoㅡg the variable factor of preparation conditions, medium polarity was changed by mixing alcohols with water to control electrostatic repulsion and thereby agglomeration phenomenon. Precipitated barium titanyl oxalate and barium titanate were examined with X-ray diffractometer (XRD), scanning electron microscopy (SEM), thermal analysis (TG-DTA) and chemical analysis.
2,4-Diethoxycarbonyl-5-iodo-3-phenyl pyrrole의 합성
방효춘,이미자 덕성여자대학교 자연과학연구소 1997 자연과학 논문집 Vol.3 No.-
We report on the synthesis of 2,4-diethoxycarbonyl-5-iodo-3-phenyl pyrrole. This compound will be used for further synthesis of aryl substituted porphycene. A modification of general iodopyrrole synthetic method has been used.
혼합용액에서 코발트 화합물의 선택적 용매화 현상(Ⅱ). ??Co-NMR Linewidth에 미치는 Viscosity의 영향과 Chemical Shift와의 관계
방효춘 德成女子大學校 1996 德成女大論文集 Vol.25 No.-
The analysis of changes of linewidth on mixed solvent systems of cobalt porphyrin compounds has been carried out with the treatment scheme of Covington, and the results were compared with the one from the chemical shift data. The application of Deverell's approach indicated that the linewidth data could be more sensitive tool to analyze the solvation behavior.
2,7,12,17-Tetrapropylporphycene과 금속(Ni^Ⅱ,Co^Ⅱ,Cu^Ⅱ)을 이용한 Metalloporphycene의 합성
방효춘,임문영 덕성여자대학교 자연과학연구소 1996 자연과학 논문집 Vol.2 No.-
In order to investigate the physical properties of the potential sensitizer for Photodynamic Therapy (PDT), 2,7,12,17-Tetrapropylporphycene (TPrPc) was synthesized. A strong absorption was observed by TPrPc at longer wavelength than 620 nm, which is the wavelength usually used for treatment. TPrPc is stable in air, crystallizes in the form of violet needles, and is soluble in organic solvents to give blue solutions showing red-violet fluorescence. Metalloporphycene was also prepared with metals of Ni^Ⅱ, Co^Ⅱ, and Cu^Ⅱ. The influence of the central metal on the physical-chemical properties of porphycene complex was examined through spectroscopic methods of UV/VIS, IR, and NMR.
방효춘 덕성여자대학교 자연과학연구소 1997 자연과학 논문집 Vol.3 No.-
In this report, Microsoft Excel program is introduced to chemistry major students. Also the simulated curve is made with Excel to visualize effects of temperature and concentration on kinetic studies. This report could help students to use computer softwares for learning chemistry.
방효춘 덕성여자대학교 자연과학연구소 1995 자연과학 논문집 Vol.1 No.-
In order to investigate the importance of preferential solvation on the cobalt porphyrin complexes, nine mixed solvent series of NMR measurements were carried out. The preferential solvation between the different solvent species are characterized by stepwise association constant. The treatment schemes of Covington is adopted and applied to series of ^59Co NMR data of cobalt(Ⅲ) porphyrins.
컴퓨터를 이용한 화학교육 2.SO_2(g)가 물에 용해되는 현상과 MathCad의 프로그래밍기법 적용
방효춘 덕성여자대학교 자연과학연구소 1999 자연과학 논문집 Vol.5 No.-
To help chemistry students understand the flue gas desulfurization process, we set up the process as a chemical equilibrium model in a batch system rather than a continuous flow system. It makes students easy to understand a basic concept of the desulfurization process in terms of a chemical equilibrium. Using a mathematical software, Mathcad Pro 7, we quantitatively analyzed the chemical equilibrium of our model system, which showed that MathCad is a great tool for chemists to treat and visualize the chemical concepts.
방효춘 덕성여자대학교 자연과학연구소 2001 자연과학 논문집 Vol.7 No.-
Using the programming techniques of a scientific software, MathCad 2001 Pro, the calculating methods for analytical chemistry were introduced. In this article, various types of titration curves were calculated using MathCad 2001 Pro. The results showed that MathCad 2001 Pro could be easily used in various chemical calculations and was a great tool to treat and visualize the quantitative concepts in analytical chemistry.
수용액상의 Fe(EDTA) 착물에 의한 NO 가스의 흡착에 관한 열역학적 연구
방효춘,김성옥,정해영 德成女子大學校 1996 德成女大論文集 Vol.27 No.-
In order to develope the method to remove the water-insoluble pollutant NO? in aqueous solution, metal chelate complex was used. Among the series of metals and chelates, Fe?(EDTA) was the first choice. On this paper, the binding of NO gas to Fe?(EDTA) was monitored through GC and thermodynamic parameters of that reaction was obtained. The equilibrium constants for the the binding of NO gas to Fe?(EDTA) are 1.44×10?M? at 40℃, 2.49×10?M? at 20℃, also△H?=-10.81㎉/㏖ and △S?=-12.00㎈/㏖·K.