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리튬-탄소층간화합물의 Deintercalation에 따른 구조변이와 전기적 성질과의 관계(I) : Li-GFDICs와 Li-PCDICs의 생성에 대하여
오원춘,백대진,고영신,Oh, Won-Chun,Baek, Dae-Jin,Ko, Young-Shin 한국분석과학회 1995 분석과학 Vol.8 No.2
가온 가압법으로 합성한 리튬-흑연섬유간화합물(Li-Graphite Fiber Intercalation Compounds, Li-GFICs)과 리튬-석유코크스층간화합물(Li-Petroleum Cokes Intercalation Compounds, Li-PCICs)을 공기 순환에 의하여 자발적으로 deintercalation시키고, 이 deintercalation의 분해 과정으로 나타나는 Li-GFDICs와 Li-PCICs의 구조를 전기적 성질에 미치는 영향에 대하여 논의하였다. 이에 대한 분석은 X-선 회절과 전기 비저항 측정에 의해 수행되었다. X-선 회절 분석에 의하면 Li-GFDICs의 경우 주로 2 stage가 형성되었고 Li-PCICs의 경우에는 1 stage와 2 stage가 주된 회절선으로 나타났다. 또한 deintercalatlon 반응 결과에 의하면 Li-GFDICs의 경우 5주 이후에, Li-GFDICs의 경우 3주 후에 deintercalation 반응이 각각 멈췄다. 전기 비저항 측정 결과에 의하면 Li-GFDICs의 경우 3주까지는 거의 변화가 없었고 그 후 완만한 상승곡선을 나타내었으며, Li-PCDICs의 경우에는 3주를 정점으로 하향곡선을 나타내었다. 따라서 본 연구결과에 의하면 기질로 사용된 흑연섬유와 석유 코크스의 경우 리튬의 원활한 intercalation-deintercalation 작용이 잘 이루어지므로 두 물질 모두 전지의 양극재로 사용될 수 있을 것으로 기대되어진다. We have discussed on the structural transition and its effect on the electrical property of Li-GFDICs and Li-PCDICs occuring during the deintercalation process of Li-Graphite Fiber Intercalation Compounds(Li-GFICs) and Li-Petroleum Cokes Intercalation Compounds(Li-PCDICs) synthesized under pressure and temperature by spontaneous oxidation by air circulation. The analytical results were obtained by X-ray diffraction and electrical specific resistivity measurements. According to X-ray analysis, we have found that the major stage of Li-GFICs was stage 2 and those of Li-PCICs were stage 1 and stage 2, respectively. And from this results of the deintercalation process, we have found that the deintercalation process did not occur any more after 5th week of Li-GFDICs and after 3rd week of Li-PCDICs. According to the results of the electrical specific resistivity measurements, Li-GFDICs showed little variation to 3rd week and rising in the steady curve after 4th week, while Li-PCDICs showed a rising in the steady curve to 3rd week and a declining curve after 3rd week. Therefore from these results, we can consider that graphite fiber and petroleum cokes as a substrate can be also used as an anode material of battery because they have good intercalation-deintercalation reactivity with lithium.
Oxidative Synthesis of Benzoylpteridines from Benzylpteridines by Potassium Permanganate
김연희,강용한,백대진,Kim, Yeon Hui,Gang, Yong Han,Baek, Dae Jin Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.2
6- and 7-Benzylpteridine derivatives have been converted to the corresponding 6- and 7-benzoylpteridines by the oxidation reaction with KMnO4. The newly synthesized compounds have been characterized by pKa determinations, UV, and 1H-NMR spectra.
김영숙 ( Young Sook Kim ),백대진 ( Dae Jin Baek ) 한국두피ᆞ모발미용학회 2008 대한미용학회지 Vol.4 No.2
Human hair is an important element in expression of aesthetic consciousness pursuing beauty. The early hair articles were extracted from each kind of animals, plants and minerals. In ancient times, they mixed honey, egg, wheat flour and excrement of seabirds with blood of black cows, the back shell of turtle, juice of each kind of plants and oil components from wool and applied them to hair. Hair articles using in the present are most of synthetic chemical products and cause hair damage. Therefore, modern people take a lot of interests in eco-environmental natural materials, which are popularized. Therefore, the study proposed an effect of treatment systematically with the safe liquid extracted from sweet flags which are good for sedation, antitussive effect, analgesia and peptic effect. The study analyzed hair color, interception of ultraviolet rays, elasticity, surface observation and components.