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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: 2015-06-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

[0029] (1) with Ag 60 Mg 15 Ca 25 As the nominal composition of the initial alloy, the pure elements required for the initial alloy (Ag>99.99 wt%, Mg>99.99 wt%, Ca>99.0 wt%) were converted into mass (5g) according to the atomic percentage of the alloy and weighed, and immediately Place it in a corundum crucible and seal the tube, and vacuum the tube to 10 -4 Pa below, and filled with high-purity argon (>99.9 wt%).

[0030] (2) Use induction heating equipment to separate the sealed tubes of Ag 60 Mg 15 Ca 25 The initial alloy components are melted.

[0031] (3) Ag that will remove the surface oxide scale 60 Mg 15 Ca 25 The initial alloy ingot is re-melted by induction heating in the quartz tube, and is continuously and rapidly sprayed onto the water-cooled rotating copper roller under the action of high-purity argon with a pressure of about 0.2 MPa to form Ag 60 Mg 15 Ca 25 Quick-quenched ribbon, Ag 60 Mg 15 Ca 25 The characteristics of the amorphous structure of ...

Embodiment 2

[0036] (1) With the Ag prepared in Example 1 60 Mg 15 Ca 25 Amorphous thin ribbons are used as precursors.

[0037] (2) Use an ice-brine bath (1 mol / L NaCl ice solution) to control the temperature of the corrosion environment at about 0°C, and perform electrochemical corrosion at 0°C.

[0038] (3) Under the temperature conditions of step (2), with Ag 60 Mg 15 Ca 25 Amorphous strips were used as the anode and pure silver as the cathode, using 0.2 mol / L MgCl 2 The solution was used as an electrolytic corrosion solution, and was corroded for 30 min under the action of a voltage of 1.5 V for dealloying treatment.

[0039] (4) After the corrosion is over, wash it repeatedly with absolute alcohol until the MgCl 2 The electrolytic corrosion solution is completely washed, 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 ...

Embodiment 3

[0042] (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%), Convert the atomic percentage of the alloy into a mass (5g) and weigh it, and immediately place it in a corundum crucible and seal the tube, and vacuum the tube to 10 -4 Pa below, and filled with high-purity argon (>99.9 wt%).

[0043] (2) Use induction heating equipment to separate the sealed tubes of Ag x Mg 80-x Ca 20 The initial alloy components are melted.

[0044] (3) Ag that will remove the surface oxide scale x Mg 80-x Ca 20 The initial alloy ingot is re-melted by induction heating in the quartz tube, and is continuously and rapidly sprayed onto the water-cooled rotating copper roller 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-quenched ribbon.

[0045] (4) Under normal temperature condition...

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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

Technical field: [0001] The present 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 remove the Mg and Ca were dealloyed to design and prepare a series of nanoporous silver materials with controllable pore structure and excellent performance. Background technique: [0002] 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, and flexible and adjustable structure, nanoporous metals show a series of unique mechanical, physical, and chemical properties, and are expected to be used in biology, medicine, and chemical industry. , energy and other fields have been widely used. For example, the performance of supercapacitors with nanoporous gold f...

Claims

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Application Information

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Patent Type & Authority Patents(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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