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Method for preparing nano porous silver based on Ag-based amorphous alloy

A nanoporous silver and amorphous alloy technology, applied in the field of design and preparation of nanoporous metal materials, can solve the problems of low purity of nanoporous materials, unenvironmental protection of corrosive liquid, and uneven pore size, and achieve uniform pore size distribution and composition The effect of wide range and mild corrosion process

Active Publication Date: 2013-08-21
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, in the preparation process of nanoporous silver, crystalline alloys are mainly used as precursors, but a series of problems encountered in the preparation process: 1. The range of available components is narrow; 2. The prepared pore size is not uniform; 3. The purity of the prepared nanoporous material is not high; 4. The corrosive solution is not environmentally friendly, etc.

Method used

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  • Method for preparing nano porous silver based on Ag-based amorphous alloy
  • Method for preparing nano porous silver based on Ag-based amorphous alloy
  • Method for preparing nano porous silver based on Ag-based amorphous alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) with Ag 60 Mg 15 Ca 25 As the nominal composition of the initial alloy, the pure elements (Ag> 99.99 wt%, Mg>99.99 wt%, Ca> 99.0 wt%) required by the initial alloy were converted into mass (5g) according to the atomic percentage of the alloy, and immediately Place the corundum crucible and seal the tube, and vacuum the tube to 10 -4 below pa, and filled with high-purity argon (>99.9 wt%).

[0035] (2) Use induction heating equipment to seal the Ag after sealing 60 Mg 15 Ca 25 The initial alloying components are smelted.

[0036] (3) Ag that will remove the surface oxide scale 60 Mg 15 Ca 25 The initial alloy ingot was remelted by induction heating in a quartz tube, and was continuously and rapidly sprayed onto a water-cooled rotating copper roll under the action of high-purity argon with a pressure of about 0.2 MPa to form Ag 60 Mg 15 Ca 25 Rapid quenching strip, Ag 60 Mg 15 Ca 25 The amorphous structural features of the thin ribbon samples were conf...

Embodiment 2

[0042] (1) Ag prepared in Example 1 60 Mg 15 Ca 25 Amorphous ribbons are used as precursors.

[0043] (2) An ice-salt bath (1 mol / L NaCl in ice water solution) was used to control the temperature of the corrosion environment at about 0 °C, and electrochemical corrosion was carried out at 0 °C.

[0044] (3) Under the temperature conditions of step (2), with Ag 60 Mg 15 Ca 25 Amorphous ribbon as anode, pure silver as cathode, using 0.2 mol / L MgCl 2 The solution was used as an electrolytic etching solution, and was etched for 30 min under the action of 1.5 V for dealloying treatment.

[0045] (4) After the corrosion is over, repeatedly wash with anhydrous alcohol until MgCl 2 The electrolytic etching solution is completely washed, and then dried and stored at room temperature. The obtained nanoporous silver still has a three-dimensional continuous through-hole structure, the pore size and distribution are more uniform, the ligament size is about 50 nm, and the pore size is...

Embodiment 3

[0049] (1) with Ag x Mg 80-x Ca 20 (x=40, 45, 50, 55, 60, x is the atomic percentage) as the initial alloy, the pure elements required for the initial alloy (Ag>99.99 wt%, Mg>99.99 wt%, Ca>99.0 wt%), Weigh it according to the atomic percentage of the alloy converted into mass (5g), and immediately place it in a corundum crucible and seal the tube, and vacuum the tube to 10 -4 below pa, and filled with high-purity argon (>99.9 wt%).

[0050] (2) Use induction heating equipment to seal the Ag after the tube respectively x Mg 80-x Ca 20 The initial alloying components are smelted.

[0051] (3) Ag that will remove the surface oxide scale x Mg 80-x Ca 20 The initial alloy ingot was remelted by induction heating in a quartz tube, and was continuously and rapidly sprayed onto a water-cooled rotating copper roll under the action of high-purity argon with a pressure of about 0.2 MPa to form Ag x Mg 80-x Ca 20 Amorphous fast quenching ribbon.

[0052] (4) Under normal temp...

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Abstract

The invention belongs to the field of preparation of nano porous metal materials, and relates to a method for preparing nano porous silver based on an Ag-based amorphous alloy. By the method, the nano porous silver with the aperture of 20-100 nm is finally obtained by preparing a series of Ag-Mg-Ca amorphous alloy thin bands by taking the Ag-based amorphous alloy as a precursor by a solvent quick quenching method and then removing Mg and Ca elements by performing electric chemical alloy component corrosion removal by proper electrolyte. By the method, the structure and the size of the nano porous silver are adjusted and controlled by controlling the amorphous alloy components or electric chemical corrosion temperature; the operation technology is simple; and furthermore, the nano porous silver is extremely high in surface-enhancement raman scattering (SERS) performance and has a wide application prospect in the fields of environment friendliness, catalysis and biological sensors.

Description

[0001] Technical field: [0002] The invention relates to the design and preparation technology of nano-porous metal materials. Specifically, the Ag-Mg-Ca amorphous alloy thin strip is prepared by the method of rapid quenching of the melt, and then electrochemical corrosion is used to quench the alloy in the alloy. A series of nanoporous silver materials with controllable pore structure and excellent performance were designed and prepared by dealloying of Mg and Ca. [0003] Background technique: [0004] Nanoporous metals are a new class of nanostructured materials developed in recent years. Due to its high surface area, low density, high permeability, high electrical and thermal conductivity, flexible and adjustable structure, etc., nanoporous metal shows a series of unique mechanical, physical and chemical properties, which is expected to be used in biology, medicine, chemical industry and so on. , energy and other fields have been widely used. For example, the perform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C5/00C22F1/14C25F3/14
Inventor 刘雄军李睿王辉吴渊吕昭平
Owner UNIV OF SCI & TECH BEIJING
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