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A method for preparing nano-alloy droplets by laser irradiation

A technology of laser irradiation and nano-alloys, which is applied in the direction of nanotechnology, chemical instruments and methods, metal processing equipment, etc., to achieve the effects of high efficiency, short reaction cycle and low reaction temperature

Inactive Publication Date: 2021-08-24
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conversion from liquid phase targets to liquid phase nanoparticles based on laser irradiation technology is still in a blank stage. The main technical difficulties are: (1) The target should maintain its original properties during the photothermal process, If not decomposed, etc., (2) The liquid phase target has a tendency to spontaneously fuse together to form larger droplets, so it is necessary to ensure the effective maintenance and preservation of the generated nanoparticles

Method used

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  • A method for preparing nano-alloy droplets by laser irradiation
  • A method for preparing nano-alloy droplets by laser irradiation
  • A method for preparing nano-alloy droplets by laser irradiation

Examples

Experimental program
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Effect test

preparation example Construction

[0037] S1. Preparation of liquid metal / organic solvent precursor

[0038] The liquid metal is pre-dispersed, and the pre-dispersed liquid metal is placed in an organic solvent to obtain a liquid metal / organic solvent precursor. In order to ensure the stability of the precursor, the concentration of the liquid metal / organic solvent precursor is controlled at 0.01~ Between 1mg / ml;

[0039] S2, laser evaporation

[0040] Introduce a non-focused laser into the liquid metal / organic solvent precursor prepared in S1, and conduct laser irradiation evaporation under stirring conditions;

[0041] The introduced non-focused laser meets the following conditions: the wavelength absorption rate of the organic solvent to the non-focused laser is ≤0.1%, and the wavelength absorption rate of the liquid metal to the non-focused laser is ≥50%. This means is to make the liquid metal target absorb enough energy to evaporate , but not too high to break down the liquid metal target to generate pla...

Embodiment 1

[0048] A preparation method of liquid nano-alloy GaInSn, such as figure 1 shown, including the following steps:

[0049] S1. Preparation steps of liquid metal / organic solvent precursor: Pre-place 0.05mg of liquid metal target GaInSn alloy in 1ml of organic liquid medium ethanol to obtain 0.05mg / ml GaInSn alloy / organic solvent precursor in the form of nano-suspension ;

[0050] S2. Laser evaporation: introduce a non-focused pulsed laser beam with a wavelength of 1064nm and an energy of 200mJ / pulse cm-2 into the precursor solution for 5min irradiation, and during the evaporation process of the laser irradiation, the temperature is controlled at -5~0 ℃, continuously stirring the precursor solution; the reason why ethanol is selected as the organic solvent is that ethanol does not absorb the wavelength of 1064nm, satisfying that it is less than or equal to 0.1%, and the wavelength absorption rate of the liquid metal to the non-focused laser is ≥80%;

[0051] S3. Generation of pa...

Embodiment 2

[0058] A preparation method of liquid nano-alloy GaInSn, comprising the following steps:

[0059] S1. Preparation steps of liquid metal / organic solvent precursor: Pre-place 0.05 mg of liquid metal target GaInSn alloy in 1 ml of organic liquid medium ethyl acetate to obtain a 0.05 mg / ml precursor;

[0060] S2. Laser evaporation: introduce 1064nm into the precursor solution with an energy of 400mJ / pulse cm -2 The unfocused pulsed laser beam was irradiated for 5 minutes. During the evaporation process of the laser irradiation, the temperature was controlled at -5 ~ 0°C, and the precursor solution was continuously stirred; ethyl acetate was selected as the organic solvent in this example, for the same reason as in Example 1. All because ethanol does not absorb the wavelength of 1064nm, satisfying less than or equal to 0.1%, and the wavelength absorption rate of the liquid metal to the non-focused pulsed laser is greater than or equal to 80%.

[0061] S3. Generation of passivation...

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Abstract

The invention discloses a method for preparing nano-alloy droplets by laser irradiation, which belongs to the technical field of liquid metal, and comprises the following steps: S1, pre-dispersing the liquid metal, placing the pre-dispersed liquid metal in an organic solvent to obtain Liquid metal / organic solvent precursor; S2, introduce non-focused laser into the liquid metal / organic solvent precursor prepared in S1, and conduct laser radiation evaporation under agitation; S3, system after laser evaporation to S2 under agitation Into a mixed gas containing oxygen to promote the generation of the passivation layer; S4, after the passivation layer is generated, concentrate or separate to make nano-alloy droplets; the nano-droplets prepared by the preparation method provided by the invention are uniform in composition, The size structure is controllable, and the surface is highly modifiable without ligands, which provides a method for preparing basic materials for applications in the fields of flexible electronics, photocatalysis, and nanomedicine.

Description

technical field [0001] The invention belongs to the technical field of liquid metal, and in particular relates to a method for preparing nano-alloy liquid droplets by laser irradiation. Background technique [0002] Gallium-based liquid metal alloys, such as eutectic gallium indium (EGaIn) and gallium indium tin (Galinstan), have many excellent physical and chemical properties such as high electrical and thermal conductivity, negligible vapor pressure, and toxicity far lower than mercury. In addition, the surface of this liquid metal will form a natural gallium oxide thin film layer, so that large droplets can be crushed by various methods such as ultrasonic treatment, ultrasonic atomization, etc. to form stable nanoparticles. These nano-scale droplets of liquid metal are widely used in the preparation of nano-medicines and conductive inks that can be sintered at room temperature because of their incomparable deformability and degradability of solid metal nanoparticles. Alt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/08B22F1/00B01J19/00B01J19/12B82Y40/00
CPCB22F9/08B01J19/0093B01J19/121B82Y40/00B22F2009/0808B22F1/145
Inventor 王洪强喻惠武赵文豪叶谦
Owner NORTHWESTERN POLYTECHNICAL UNIV
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