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Metal structure

A technology of metal structure and metal elements, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as complexity, limited practical applicability, high bending degree, etc., and achieve the effect of process simplification

Pending Publication Date: 2021-12-24
ROYAL MELBOURNE INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, while these multi-step dealloying processes offer some fabrication flexibility, the resulting metallic structures are inherently poorly mechanically stable.
Moreover, the porous network of these structures is often characterized by high tortuosity and low permeability, effectively restricting fluid flow through the structure
This effectively limits the practical applicability of these structures in fluid handling applications such as filtration, which further exposes the mechanical fragility of these structures as they generate significant backflow pressures during use.
Furthermore, the multi-step nature of conventional filler / template methods makes them inherently complex and limits their applicability on a large scale

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0099] Alloy melts are prepared by combining raw materials in water-cooled crucibles. The crucible was evacuated and partially backfilled with inert gas, then heated under reduced pressure until the material melted.

[0100] Suction casting arc melted precursor alloy rods were cut into small discs to obtain reproducible data. Using two alloy systems with different noble metals (Cu 30 mn 70 and Au 30 co 70 ) as a precursor. Nanoporous Cu disks with equigeometric shapes were prepared by free etching in 1M HCl, while in 10M HNO 3 Nanoporous Au samples were prepared by free corrosion.

[0101] figure 1(a)-(c) show pictures of different steps of the method of an embodiment of the invention. figure 1 (a) shows the precursor alloy disk obtained by slicing the solidified alloy rod. figure 1 (b) shows the dealloyed porous copper disk. figure 1 (c) shows an image of one sample immersed in a dealloying solution. The image shows a 1 M HCL aqueous solution at 60 °C with Cu 30 m...

Embodiment 2

[0108] Example 2 - Wettability Characterization

[0109] Contact angle measurements were performed on dealloyed Cu structures obtained according to the process described in Example 1. Measurements were performed on a KSV CAM 200 tensiometer under standard conditions.

[0110] Contact angle measurements confirmed that the tested Cu samples were superhydrophilic, relative to the 76.8° contact angle measured on dense Cu samples (as Figure 6 (a) shown), its contact angle is 0° (such as Figure 6 (b) shown). Regarding the porous Cu structure, it is evident from the tests that the droplets rapidly wick into the sample structure and disperse uniformly in all directions due to the large capillary force due to the multimodal porosity of the sample structure.

[0111] Superhydrophilicity can be particularly suitable for maximum wicking and surface wetting applications such as heat transfer (i.e. surface rewetting for maximum heat transfer coefficient and heat flux removal) and water...

Embodiment 3

[0112] Embodiment 3-antibacterial property test

[0113] The antimicrobial properties of the dealloyed Cu structures obtained according to the process described in Example 1 were examined. Specifically, the antibacterial activity against a representative bacterium Staphylococcus aureus was examined. Stainless steel and dense Cu were used as negative and positive controls, respectively.

[0114] Serial dilutions, agar plating and colony counts were performed to accurately quantify the viable bacteria remaining after exposure to the metal substrates of the invention and a reference control. Figure 7 (a)-(c) show the growth of Staphylococcus aureus on tryptic soy agar ( Serial dilutions and plating on TSA) plates. for Figure 7 For each Petri dish shown in (a)-(c), each quadrant represents 1 to 10 -3 The dilution factor for the range. Colony populations (5 x 10 uL droplets of bacterial solution in each quadrant) were grown based on the number of viable bacteria remaining a...

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Abstract

A method of producing a metallic structure comprising a porous interdendritic matrix defining a network of dendrite channels, the method comprising the steps of: preparing an alloy melt comprising a metal element and at least one alloying element, cooling the alloy melt to form a solid alloy , wherein said cooling promotes the formation of a dendrite network rich in said at least one alloying element within said metal-rich interdendritic matrix, dealloying said solid alloy to remove from dendrites and interdendritic matrix Alloying elements are removed to obtain the metallic structure.

Description

technical field [0001] The present invention generally relates to methods of obtaining metallic structures, said metallic structures and antimicrobial devices comprising said metallic structures. The metal structure may have a multimodal pore size distribution. Background technique [0002] Over the years, considerable research effort has been devoted to the development of structures made of porous metals for specific industrial needs. Existing processes for making porous metals include dealloying of solid solution alloys. In essence, dealloying refers to the selective leaching of one or more elements from a solid solution alloy to produce a remaining porous structure. This remaining structure is enriched in less reactive (ie lesser) elements to the leaching medium and exhibits a three-dimensional network of voids left by the more reactive (ie lesser) elements that were removed. Dealloying processes are commonly used to fabricate porous metal structures characterized by i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C3/00C25F3/02C22C5/02C23F1/16
CPCC22C3/00C25F3/02C23F1/18C23F1/30B82Y30/00B82Y40/00C22C5/02C22C9/05C22C9/00C23F1/00
Inventor 杰克逊·利·史密斯钱马宋婷婷丹尼尔·梁
Owner ROYAL MELBOURNE INST OF TECH