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2017 年度 実績報告書

ナノ構造の金属材料における評価と光学を使った特性の研究

研究課題

研究課題/領域番号 17F17793
研究機関東北大学

研究代表者

平田 秋彦  東北大学, 材料科学高等研究所, 准教授 (90350488)

研究分担者 XIA YANJIE  東北大学, 材料科学高等研究所, 外国人特別研究員
研究期間 (年度) 2017-11-10 – 2020-03-31
キーワードnanoporous materials
研究実績の概要

Recently our group has reported a new environmentally friendly method for vapor phase dealloying to fabricate novel nanoporous materials. This new method mainly utilizes a difference in vapor pressure between the constituent elements of alloys to selectively remove one of the components with a high partial vapor pressure. However the detailed mechanism of vapor phase dealloying has not been clarified so far.
In this study, we used a Zn-Cu alloy system to examine a difference in diffusion depth for the two elements. By vapor phase dealloying, the nanoporous Cu has been prepared from a Zn-Cu alloy at 350 degreeC and 400 degreeC in low vacuum for different times, ranging from 10 minutes to 110 minutes. The changes of depth and element distribution with the change of time have been characterized by scanning electron microscopy and energy dispersive X-ray spectroscopy. For 10 minutes, there are almost no pores in the sample. With the increase of dealloying time, the pores gradually appear. Comparing these samples, we found that the dealloying depth increases with time. It might be possible to understand the dealloying depth’s functional dependence on time and temperature by dissolution model.

現在までの達成度 (区分)
現在までの達成度 (区分)

2: おおむね順調に進展している

理由

The research has been carried out properly along the initial plan that aimed at fabricating alloy-based hybrid nanostructures with porosity. However, we have found that the alloy ribbon is not suitable for fabrication. We now start to use bulk materials to improve the materails.

今後の研究の推進方策

After the investigation related to the depth analysis, we have obtained the above-mentioned experimental data of the diffusion kinetics. In the next step, we will provide a reasonable model to understand the diffusion kinetics of the dealloying process.

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公開日: 2018-12-17  

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