Liquid metal aerogel as well as preparation method and application thereof

A liquid metal and aerogel technology, applied in the field of nanomaterials, can solve the problems of lack of precursors in liquid metals, large surface tension of liquid metals, and difficulty in synthesizing macroscopic materials, achieving good hydrophilicity and chemical stability, excellent Effects of photothermal and strong sunlight absorption properties

Active Publication Date: 2020-04-17
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, the direct application of liquid metals is facing two huge problems: On the one hand, liquid metals generally have a large surface tension, which makes it difficult to be dispersed and used as filling materials
Although researchers currently use methods such as electric field, ultrasound, pneumatic dispersion, and microfluidics to disperse liquid metal into micro-droplets to facilitate the next step of manipulation, the stable existence of droplets is still a huge challenge.
At the same time, the high surface tension causes serious interface problems when liquid metal is combined with other materials, and it is easy to leak
On the other hand, liquid metals lack precursors and are difficult to chemically synthesize into self-supporting macroscopic bulk materials.
The Liu Jing research group of Tsinghua University proposed to mix other metal nanoparticles and a certain amount of acid in the liquid metal, and generate gas by forming a primary battery to form pores to form a liquid metal porous material (Mater.Horiz., 2018, 5, 222-- 229), but the obtained porous liquid metal will melt again at higher temperature, the pore structure will disappear, and it is not stable
Although liquid metal has been studied more, the above two shortcomings still limit its application.

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  • Liquid metal aerogel as well as preparation method and application thereof
  • Liquid metal aerogel as well as preparation method and application thereof
  • Liquid metal aerogel as well as preparation method and application thereof

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preparation example Construction

[0049] Another aspect of the embodiments of the present invention also provides a method for preparing a liquid metal aerogel, comprising the following steps:

[0050] (1) dispersing the liquid metal in an aqueous polysaccharide solution to form liquid metal nanoparticles, and wrapping the liquid metal nanoparticles by polysaccharides to obtain a stable dispersion;

[0051] (2) Uniformly mix the dispersion of liquid metal nanoparticles obtained in step (1) with graphene oxide, then sequentially add metal hydroxide colloid and gluconolactone for ionic cross-linking, and let stand to obtain liquid metal hydrogel glue;

[0052] (3) reducing the graphene oxide in the liquid metal hydrogel with a reducing agent;

[0053] (4) Solvent replacement and drying are performed on the liquid metal hydrogel obtained in step (3) to obtain the liquid metal aerogel.

[0054] In some more specific embodiments, the preparation method specifically includes:

[0055] (1) Ultrasonic dispersion of...

Embodiment 1

[0087] (1) Preparation of liquid metal nanoparticles: prepare a sodium alginate aqueous solution with a mass percentage of 0.01wt%, take 40mL, add 40mg of liquid metal gallium, and use 400W power for ultrasonication to obtain a dispersion of gallium nanoparticles, which is wrapped in liquid metal The thickness of sodium alginate on the gallium surface is 5nm.

[0088] (2) Mix 4 mL of the above-mentioned gallium nanoparticle dispersion with 2 mL of 4 mg / mL graphene oxide aqueous solution, mix well, add 0.1 mol of lanthanum hydroxide colloidal solution, then add 2 mol of gluconolactone, stir for 30 s and let stand for 12 h, A liquid metal gallium hydrogel is obtained.

[0089] (3) The liquid metal hydrogel was immersed in a 1.5 mol / L ascorbic acid aqueous solution for 48 hours at room temperature to reduce the graphene oxide.

[0090] (4) Replace the above-mentioned liquid gallium metal hydrogel with ethanol, the volume ratio of ethanol and liquid metal gallium hydrogel is 5:1,...

Embodiment 2

[0093](1) Preparation of liquid metal nanoparticles: Prepare a chitin solution with a mass percentage of 1wt%, take 40mL, add 40mg of liquid metal indium, and use 400W power for ultrasonication to obtain an indium nanoparticle dispersion, which is wrapped on the surface of the liquid metal indium The thickness of sodium alginate is 8nm.

[0094] (2) Take 4mL of the above-mentioned indium nanoparticle dispersion and mix with 2mL of 4mg / mL graphene oxide aqueous solution. After mixing evenly, add 1mol ferric hydroxide colloidal solution, then add 0.1mol gluconolactone, stir for 30s and then let it stand for 12h. A liquid metal indium hydrogel is obtained.

[0095] (3) The above-mentioned liquid metal indium hydrogel was immersed in a 3 mol / L ascorbic acid aqueous solution, and immersed at 40° C. for 40 h to reduce the graphene oxide.

[0096] (4) Replace the above-mentioned liquid metal indium hydrogel with ethanol, the volume ratio of ethanol to liquid metal indium hydrogel is...

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Abstract

The invention discloses liquid metal aerogel as well as a preparation method and application thereof. The liquid metal aerogel has a continuous three-dimensional porous network structure; the continuous three-dimensional porous network structure is formed by overlapping liquid metal nanoparticles and a graphene sheet layers, and at least a part of the liquid metal nanoparticles are wrapped by thegraphene sheet layers. The preparation method comprises the following steps: dispersing a liquid metal in a polysaccharide aqueous solution to form the liquid metal nanoparticles, and wrapping the liquid metal nanoparticles with polysaccharide to obtain a stable dispersion liquid; uniformly mixing the stable dispersion liquid with graphene oxide, adding a metal hydroxide colloid and glucolactone,carrying out ionic crosslinking, standing to obtain a liquid metal hydrogel, and carrying out reduction, solvent replacement treatment and drying treatment to obtain the liquid metal aerogel. The liquid metal aerogel has the advantages of high specific surface area, low density, high thermal conductivity, hydrophilicity, chemical stability, simple preparation process, mild and controllable reaction conditions and a wide application prospect.

Description

technical field [0001] The invention relates to a liquid metal aerogel, in particular to a liquid metal aerogel, a preparation method and an application thereof, and belongs to the technical field of nanometer materials. Background technique [0002] Liquid metal is a metal that can be liquid at room temperature. It has attracted much attention in recent years because it has both the properties of a metal and the fluidity of a liquid. Because liquid metal has excellent properties such as low melting point, high electrical conductivity and high thermal conductivity, it has broad application prospects in the fields of 3D printing, flexible electronic devices, molecular machines, thermal management and medical carriers. So far, the direct application of liquid metals is facing two huge problems: On the one hand, liquid metals generally have a large surface tension, which makes it difficult to be dispersed and used as filling materials. Although current researchers use methods ...

Claims

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Application Information

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IPC IPC(8): B01J13/00B22F9/08
CPCB01J13/0091B22F9/08B22F2009/0804
Inventor 张学同吴晓涵
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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