3(孔隙率98.19%)以下。制備的超低密度多孔金明顯地縮小了模板留下的大孔(500 nm)和去合金產(chǎn)生的小孔(2-70nm)之間的尺寸差距,有效地提高了結(jié)構(gòu)的均勻性。"/>

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結(jié)構(gòu)均勻的超低密度納米多孔金塊體制備與表征及其體積收縮的控制
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四川大學(xué)材料科學(xué)與工程學(xué)院,四川大學(xué)材料科學(xué)與工程學(xué)院,四川大學(xué)材料科學(xué)與工程學(xué)院,四川大學(xué)材料科學(xué)與工程學(xué)院

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四川省科技支撐計(jì)劃資助項(xiàng)目（2014GZ0137）


Fabrication, characterization of ultra-low-density bulk nanoporous gold with uniform structure and volume shrinkage control during drying
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Science and Technolgy Support Project of Sichuan Province (2014GZ0137)

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    摘要:

    超低密度納米多孔金塊材是慣性約束聚變(ICF)的目標(biāo)材料。由于結(jié)構(gòu)的不均勻性和有機(jī)模板分解造成的碳元素殘留等原因,現(xiàn)有的多孔金在ICF應(yīng)用中有一定的局限性。因此,結(jié)合去合金化方法以二氧化硅為模板制備出了具有亞微米級(jí)大孔和納米級(jí)小孔的雙級(jí)孔結(jié)構(gòu)的納米多孔金塊體。然而,模板尺寸的急劇減小使得金含量用量極低而引起樣品在干燥過(guò)程中嚴(yán)重收縮。因此研究了干燥方式對(duì)多孔金體積收縮的影響。結(jié)果表明,樣品在普通干燥過(guò)程中體積收縮高達(dá)86.41%,而采用超臨界干燥體積收縮被控制到4%以下,密度被控制到0.35g/cm3(孔隙率98.19%)以下。制備的超低密度多孔金明顯地縮小了模板留下的大孔(500 nm)和去合金產(chǎn)生的小孔(2-70nm)之間的尺寸差距,有效地提高了結(jié)構(gòu)的均勻性。

    Abstract:

    Ultra-low-density bulk nanoporous gold (NPG) is required in inertial confined fusion (ICF) experiments. Existing bulk NPG has some limitations in ICF application due to non-uniformity structure or residues of C elements originated from organic template. Here, combined with dealloying, NPG with submicron cavities and nanopores was prepared by nano-SiO2 templates. However, the smaller templates bring greater challenges for the volume shrinkage control during drying as gold content on each shell is extremely low for ultra-low density. Therefore, the influence of drying method on volume shrinkage was investigated. The results show that volume shrinkage was up to 86.41% during conventional drying, but it was controlled below 4% by supercritical CO2 drying. Finally, NPG with ultra-low-density of 0.35g/cm3 was successfully fabricated. Compared to NPG prepared by micro templates, the NPG with 500nm spherical cavities and 2-70nm nanopores reduces the size difference between large cavities and nanopores and significantly improves the uniformity of its structure.

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劉朝清,連利仙,劉穎,李芹.結(jié)構(gòu)均勻的超低密度納米多孔金塊體制備與表征及其體積收縮的控制[J].稀有金屬材料與工程,2018,47(8):2322~2327.[Liu Chaoqing, Lian Lixian, Liu Ying, Li Qin. Fabrication, characterization of ultra-low-density bulk nanoporous gold with uniform structure and volume shrinkage control during drying[J]. Rare Metal Materials and Engineering,2018,47(8):2322~2327.]
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  • 收稿日期:2017-01-19
  • 最后修改日期:2017-03-18
  • 錄用日期:2017-04-14
  • 在線發(fā)布日期: 2018-10-17
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