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Method for inducing fusion sintering of liquid metal micro-nano liquid drops by utilizing solvent evaporation

A liquid metal, evaporation-induced technology, which is used in the manufacture of conductive/semiconductive layer equipment, cable/conductor manufacturing, heat treatment equipment, etc., can solve the complicated operation, high mechanical performance requirements of the substrate, and energy consumption. advanced questions

Active Publication Date: 2020-10-30
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, external pressure, laser, high temperature and other conditions are cumbersome to operate, high in cost, high in energy consumption, and have certain limitations. For example, high temperature sintering requires high heat resistance of the substrate carrying liquid metal droplets; pressure sintering High requirements on the mechanical properties of the substrate; potential safety hazards in laser sintering, etc.

Method used

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  • Method for inducing fusion sintering of liquid metal micro-nano liquid drops by utilizing solvent evaporation
  • Method for inducing fusion sintering of liquid metal micro-nano liquid drops by utilizing solvent evaporation
  • Method for inducing fusion sintering of liquid metal micro-nano liquid drops by utilizing solvent evaporation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1) Add 100mg of gallium-indium alloy (74.5wt% Ga and 24.5wt% In) into 10mL of deionized water, and use an ultrasonic breaker with a power of 300W to sonicate for 60min in an ice-water bath;

[0045] 2) Drop-coat the gray solution obtained in step 1) onto a glass substrate, dry and sinter at room temperature (25°C) under vacuum (-0.1MPa) (see figure 1 ).

[0046] By observing figure 1 It is known that water-dispersed liquid metals are used to form micro-nano droplets at room temperature (25°C) and vacuum conditions (-0.1MPa) for natural drying, and the surface tension formed under vacuum conditions increases, further increasing the capillary force generated during the drying process. The force will promote the fusion and sintering of liquid metal droplets, and a layer of liquid metal film will be formed on the glass substrate. The upper side of the film is dark gray, and the lower side close to the glass substrate is bright silvery white. This material can be used as a ...

Embodiment 2

[0048] 1) Add 100mg of gallium-indium alloy into 10mL of deionized water, and use an ultrasonic breaker with a power of 300W to sonicate for 60min in an ice-water bath;

[0049] 2) Add 5 mL of 2 mg mL to the solution obtained in step 1) –1 TEMPO oxidized cellulose (carboxyl content ~ 1.4mmol g -1 ) the nanofiber solution was stirred for 30 min to make it evenly mixed;

[0050] 3) The gray solution obtained in step 2) was drip-coated on a glass substrate, and dried and sintered at room temperature (25°C) and normal pressure (0.1MPa) (see Figure 2-4 ).

[0051] SEM Figure 2-4 It is known from the analysis that water-dispersed liquid metal is used to form micro-nano droplets and then cellulose nanofibers oxidized by the auxiliary agent TEMPO are added. The average diameter of the obtained uniformly mixed particles is 100nm, and the outside has fiber entanglement. The added cellulose nanofibers can be During the evaporation process, the capillary force is increased to promot...

Embodiment 3

[0053] 1) Add 100mg gallium indium alloy to 10mL with a concentration of 1mg mL –1 In the aqueous ethanol solution (water in the aqueous ethanol solution: the volume ratio of ethanol is 9:1) of the silk nanofibers, utilize the sonicator that power is 300W ultrasonic 60min under ice-water bath condition;

[0054] The preparation method of the silk nanofibers can be found in literature (ACS Nano, 2017, 11, 8178).

[0055] 2) Stir with magnetic force for 30 minutes after ultrasonication, and the stirring speed is 1000 revolutions per minute, so that the silk nanofibers and liquid metal micro-nano particles are fully mixed evenly;

[0056] 3) The resulting gray solution is drop-coated onto a patterned polyethylene terephthalate (PET) film, dried under a vacuum of 0 MPa, and formed on the PET film at a temperature of 30°C. conductive path (see Figure 5 ).

[0057] According to the scanning electron microscope analysis, the dispersion solvent containing silk nanofibers is used t...

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Abstract

The invention relates to the technical field of liquid metal sintering fusion, and particularly relates to a method for inducing liquid fusion sintering of metal micro-nano liquid drops through solvent evaporation. The method comprises the steps of evaporating and drying a liquid metal micro-nano droplet dispersion liquid or a liquid metal micro-nano droplet dispersion liquid containing an auxiliary agent, and realizing sintering fusion by utilizing capillary acting force generated in the evaporation and drying process. The method for sintering the liquid metal micro-nano liquid drops has theadvantages of being easy and convenient to operate, low in cost, capable of being achieved at normal temperature and normal pressure and the like, and can be applied to the fields of circuit packaging, the 3D printing electronic technology, sensors, drivers, electromagnetic shielding and the like.

Description

technical field [0001] The invention relates to the technical field of liquid metal sintering and fusion, in particular to a method for inducing fusion and sintering of liquid metal micro-nano droplets by solvent evaporation. Background technique [0002] Liquid metal usually refers to a metal element or alloy with a melting point below 200°C, which perfectly combines the conductivity of metal and the fluidity of liquid. Commonly used liquid metals are gallium-based alloys (such as eutectic gallium-indium alloy: 74.5wt% Ga and 24.5wt% In, melting point ~ 15.8°C; eutectic gallium-indium-tin alloy: 62.5wt% Ga, 21.5wt% In and 16wt% Sn , melting point ~ 13.2°C; etc.). Liquid metals have excellent mechanical, thermal and electrical properties. In addition, its low toxicity and low viscosity also make it have broad application prospects in the fields of wearable sensor electronics, conductive composite materials, flexible displays, and intelligent electronic devices. The study ...

Claims

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Application Information

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IPC IPC(8): H01B13/00
CPCH01B13/0026H01B13/0016
Inventor 李朝旭李明杰李现凯
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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