http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Kusunose Takafumi (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
-
Thermoelectric properties of perovskite-type rare earth cobalt oxide solid solutions Pr1−xDyx
Hideki Hashimoto,Takafumi Kusunose,Tohru Sekino 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.3
Perovskite-type rare earth cobalt oxide Pr1−xDyxCoO3 (x = 0, 0.25, 0.5, 0.75 and 1) ceramics were fabricated by reaction sintering of the corresponding metal oxide powders, and their thermoelectric properties were evaluated up to 873 K. The electrical properties of Pr1−xDyxCoO3 varied according to a variation in the x value, whereas the thermal conductivity of the solid solutions (x = 0.25 − 0.75) tends to be lower than that of both end components (x = 0 and 1). As the results,Pr0.75Dy0.25CoO3 (x = 0.25) showed the highest figure of merit, Z = 5.72 × 10−5 K−1 at 773 K in the present Pr1−xDyxCoO3 system. This is considered due mainly to the effect of decreasing thermal conductivity caused by phonon scattering of partially substituted A-site ions. These results suggest that the fabrication of solid solutions is effective in improving the thermoelectric properties of the RCoO3 system.
-
Youn-Gyu Han,Takafumi Kusunose,Tohru Sekino 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.2
In the present study, we report on the fabrication of hybrid composites of conductive silicone elastomer with TiO2/PANI-DBSA dispersion. The hybrid composites with conductive fillers, TiO2/PANI-DBSA, were prepared via an in-situ polymerization method with various TiO2 contents. The novel elastomer composites were prepared by dispersing TiO2/PANI-DBSA at room temperature in vulcanized silicone elastomers. The morphological, structural and electrical properties of TiO2/PANI-DBSA and their elastomer blends were studied using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and electrical resistivity measurements. It was found that the electrical conductivity of the composite powder coated with about 20 wt.% PANI-DBSA was 46,000 (104) times higher than that of bare TiO2 powder. Also the electrical conductivity of the silicone elastomers composites of TiO2/PANI-DBSA were changed from 10−14 S/cm to 0.295S/cm (10 wt.% TiO2/PANI-DBSA). The novel elastomer composite had a percolation threshold between 1-3 wt.% PANI-DBSA. In the present study, we report on the fabrication of hybrid composites of conductive silicone elastomer with TiO2/PANI-DBSA dispersion. The hybrid composites with conductive fillers, TiO2/PANI-DBSA, were prepared via an in-situ polymerization method with various TiO2 contents. The novel elastomer composites were prepared by dispersing TiO2/PANI-DBSA at room temperature in vulcanized silicone elastomers. The morphological, structural and electrical properties of TiO2/PANI-DBSA and their elastomer blends were studied using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and electrical resistivity measurements. It was found that the electrical conductivity of the composite powder coated with about 20 wt.% PANI-DBSA was 46,000 (104) times higher than that of bare TiO2 powder. Also the electrical conductivity of the silicone elastomers composites of TiO2/PANI-DBSA were changed from 10−14 S/cm to 0.295S/cm (10 wt.% TiO2/PANI-DBSA). The novel elastomer composite had a percolation threshold between 1-3 wt.% PANI-DBSA.
-
Design of Nanocluster Based Material with Catalytic Properties
Tadachika Nakayama,Kim Chang-Yeoul,Tohru Sekino,Choa Yong-Ho,Takafumi Kusunose,Yamato Hayashi,Koichi Niibara 한국분말야금학회 2001 한국분말야금학회지 Vol.8 No.3
Modified inert gas condensation method was used to produce the nanocluster composites of . High-resolution TEM, SEM and catalytic measurements have been used to characterize the samples and study the synergistic effect between the CuO phase and (ceria) support. By varying the He pressure, the heating temperature and configuration of the heating boats inside the modified gas condensation chamber, nanoclusters of varying sizes, shapes and composition can be produced. The composition and nanostructured morphology were shown to influence the catalytic properties of the system. A copper content around 10 at% with a morphology that favors high-energy surfaces of ceria is shown to be beneficial for a high catalytic activity.
-
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
