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RISS 인기검색어
- 검색키워드
- 저자 : Kazuyuki Hirao (검색결과 2 건)
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Surface analysis of three aluminum foils and relation to hydrogen generation capability
Heidy Visbal,Kohji Nagashima,Kazuyuki Hirao 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.4
We have successfully generated hydrogen using aluminum foil instead of aluminum powder from the perspective of improving safety. We analyzed the surface states of three aluminum foils and correlated their surface properties with hydrogen generation capability. The surfaces of the foils were analyzed by time-of-flight secondary ion mass spectrometry (TOF-SIMS), X-ray photoelectron spectroscopy, and atomic force microscopy. Hydrogen generation was performed by adding Ca(OH)2 solution to the aluminum foil in water. The TOF-SIMS results showed that the Al foils have Al2O3 −, AlO2 −, (OH)2AlO−, (Al2O3)OH−, and (Al2O3)AlO2 − and related species on their surfaces. The amount of these species on the surface of an Al foil is linearly correlated with the hydrogen generation reaction rate.
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Morphological control of nanoparticles by femtosecond laser irradiation
Atsuo Nakao,Masayuki Nishi,Kiyotaka Miura,Kazuyuki Hirao,Yasuhiko Shimotsuma 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.4
We report on the fabrication and evolution of metal nanowires with a length of 5 μm and a diameter of 100 nm which were successfully photo-converted from scale-like copper micro-flakes, dispersed in an alcohol solution, under ultrashort pulse laser radiation and a subsequent aging treatment. The dependence of the observed copper nanowires on the conditions of the laser irradiation and aging treatment, and the influence of the surrounding solvent were also investigated. The photoinduced morphology changes are unusual and their optical properties are striking. These previously unknown metal nanowires have a very high aspect ratio, and are created by nuclear growth mechanisms. We report on the fabrication and evolution of metal nanowires with a length of 5 μm and a diameter of 100 nm which were successfully photo-converted from scale-like copper micro-flakes, dispersed in an alcohol solution, under ultrashort pulse laser radiation and a subsequent aging treatment. The dependence of the observed copper nanowires on the conditions of the laser irradiation and aging treatment, and the influence of the surrounding solvent were also investigated. The photoinduced morphology changes are unusual and their optical properties are striking. These previously unknown metal nanowires have a very high aspect ratio, and are created by nuclear growth mechanisms.
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