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

Song, Tingting; Gao, Yulai; Zhang, Zhonghua; Zhai, Qijie

doi:10.1039/c2ce06404a

Cited by 25 publications

(16 citation statements)

References 65 publications

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“…The ultrasonic agitation reduced the time by a factor of 5 without disturbing the desired structure. There has been a similar effect of the magnetic field highlighted on the nanopores of Ag [24].…”

Section: Fabrication Methodsmentioning

confidence: 71%

Nanoporous Metallic Films

Swastic¹,

Krishnan²

2021

Nanopores

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Nanoporous metallic films are known to have high surface to volume ratio due to the presence of pores. The presence of pores and ligaments make them suitable for various critical applications like sensing, catalysis, electrodes for energy applications etc. Additionally, they also combine properties of metals like good electrical and thermal conductivity and ductility. They can be fabricated using top-down or bottom-up approaches also known as dealloying and templating which give the fabricator room to tailor properties according to need. In addition, they could find potential applications in many relevant fields in current scenario like drug delivery vehicles. However, there is a long way to go to extract its whole potential.

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Section: Fabrication Methodsmentioning

confidence: 71%

Nanoporous Metallic Films

Swastic¹,

Krishnan²

2021

Nanopores

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“…The ligaments of acid-treated samples have a diameter of about 115–130 nm, but only about 65–80 nm for NaOH-treated samples. In ref ( 30 ), the authors used a Ag 25 Al 75 alloy and obtained ligaments of different sizes by treating it with 5 wt % HCl at different temperatures and times. They concluded that the surface diffusion of Ag is an activated process according to the Arrhenius law with an activation energy of 75.66 kJ mol –1 and a pre-exponential factor D o = 4.432 × 10 –4 m 2 s –1 .…”

Section: Resultsmentioning

confidence: 99%

Silver Foams with Hierarchical Porous Structures: From Manufacturing to Antibacterial Activity

Durmus

Jordá

2021

ACS Appl. Mater. Interfaces

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The development of porous materials with hierarchical porous structures is currently of great interest. These materials exhibit properties representative of different pore scales and thus open up the possibility of being used in new applications. In this paper, a method for the preparation of silver foams with hierarchical porous structures is discussed. Here, the replication method, which is typically used to produce coarse-pore foams, is merged with dealloying, which is commonly used to manufacture small-pore foams. For this purpose, packed NaCl particles (hard template) were infiltrated with 75%Al–25%Ag alloy (whose so-called soft template is the Al-rich phase). Both the hard and soft templates were removed by water dissolution and dealloying with HCl or NaOH solutions, respectively. Extensive characterization of the resulting materials revealed pores ranging from a few nanometers to hundreds of micrometers. The materials were characterized by their antibacterial performance against Gram-positive and Gram-negative bacteria and showed significantly higher activity than both silver foams prepared by sintering pure Ag particles and silver nanofoams produced by chemical dealloying. The combinations of pores of different sizes and the resulting high internal specific surface area have a decisive influence on the antibacterial capacity of these new materials.

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“…The surface diffusion coe cient, Ds, is related to the ligament size, d, according to the following equation [52][53][54]:…”

Section: Bonding Mechanisms Of Npc/cu Joints Under Different Atmospheresmentioning

confidence: 99%

Effect of various parameters on the shear strength of solid-state nanoporous Cu bonding in Cu–Cu disks for power device packaging

Park¹,

Han²,

Saito³

et al. 2021

Preprint

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Nanoparticle sintering is considered a promising alternative bonding method to Pb- based soldering for the attachment of components in high-temperature electronic devices. However, the technology still poses certain challenges, such as difficulty controlling joint thickness and the generation of voids owing to solvent evaporation. In this study, a solid-state (solvent-free), nanoporous-Cu (NPC) bonding method was examined. The effect of bonding temperatures (200–400°C) and atmospheres (N2 or formic acid) on the shear strength of joints formed between NPC sheets and bare Cu disks were investigated by scanning electron microscopy, X-ray diffraction, and transmission electron microscopy. It was shown that the bondability of NPC under an N2 atmosphere is closely related to the oxide layer formed on its surface that impairs the diffusion of Cu atoms between the NPC and Cu substrate. Furthermore, the coarsening of the NPC microstructure under a formic acid atmosphere at ≥ 350°C owing to the rapid diffusion of Cu atoms and accompanying plastic deformation induced by surface stress enhances the shear strength of the resulting NPC/Cu joint. The shear strength of NPC/Cu joints formed under a formic acid atmosphere increased from 14.1 to 35.9 MPa with increasing bonding temperature. Based on the results of the investigation, a mechanism was proposed to explain the superiority of the Cu–Cu joints achieved using this method.

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

Cited by 25 publications

References 65 publications

Nanoporous Metallic Films

Nanoporous Metallic Films

Silver Foams with Hierarchical Porous Structures: From Manufacturing to Antibacterial Activity

Effect of various parameters on the shear strength of solid-state nanoporous Cu bonding in Cu–Cu disks for power device packaging

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