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Issue 10, 2012
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Influence of magnetic field on dealloying of Al-25Ag alloy and formation of nanoporous Ag

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Abstract

The dealloying behavior of bi-phase Al–Ag alloys in 5 wt.% HCl in non-treated and magnetic treated conditions was comparatively investigated. The as-dealloyed samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray (EDX) analysis coupled with SEM. The results reveal that an external magnetic field would accelerate the dealloying process and the as-dealloyed samples from magnetic treatment are characterized by a finer and more homogeneous three dimensional (3D) bi-continuous nanoporous structure compared with those from non-treatment dealloying. The smaller diffusion coefficient (Ds) of silver and the larger diffusion activation energy (Eα) under a magnetic field can be responsible for the finer nanoporous structure. It is deemed that the formation of diamagnetic reaction products (during the etching of Al) and the crystal nucleation of silver (during the dealloying of Ag2Al) are accelerated by the external magnetic field. In addition, not only the pre-exponential factor (D0), obtained from the Arrhenius equation for diffusion of Ag, but also the activation energy (Eα) were influenced by the magnetic field, implying that different diffusion mechanisms and also the complicated underlying dealloying mechanism were involved.

Graphical abstract: Influence of magnetic field on dealloying of Al-25Ag alloy and formation of nanoporous Ag

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Publication details

The article was received on 22 Oct 2011, accepted on 02 Mar 2012, published on 29 Mar 2012 and first published online on 29 Mar 2012


Article type: Paper
DOI: 10.1039/C2CE06404A
Citation: CrystEngComm, 2012,14, 3694-3701
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    Influence of magnetic field on dealloying of Al-25Ag alloy and formation of nanoporous Ag

    T. Song, Y. Gao, Z. Zhang and Q. Zhai, CrystEngComm, 2012, 14, 3694
    DOI: 10.1039/C2CE06404A

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