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Size-controllable aerogel ball as well as preparation method and application thereof

An airgel ball and aerogel technology are applied in the fields of airgel preparation, chemical instruments and methods, and colloid chemistry. The effect of high yield

Pending Publication Date: 2021-03-26
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the preparation technologies reported so far can only achieve micro-scale preparation in the laboratory, and cannot be mass-produced due to factors such as cost and equipment.

Method used

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  • Size-controllable aerogel ball as well as preparation method and application thereof
  • Size-controllable aerogel ball as well as preparation method and application thereof
  • Size-controllable aerogel ball as well as preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0038] The invention provides a general method for preparing size-controllable airgel spheres. The general process steps of the method for preparing size-controllable airgel spheres of the present invention are as follows: figure 1 As shown, it includes the following steps:

[0039]S01. Prepare functionalized filler slurry: mix filler, viscosity modifier, salt and water according to mass ratio 1: (0.05-0.2): (0.025-0.05): (5-50) to obtain functionalized filler slurry;

[0040] S02. EFI processing the functionalized filler slurry: put the functionalized filler slurry into the EFI treatment device to obtain filler slurry droplets with controllable diameter;

[0041] S03. Prepare an airgel ball precursor from the functionalized filler slurry droplets produced by electrospray: drop the filler slurry droplets with controllable diameter into a low-temperature refrigeration medium, perform freezing treatment to form a frozen mixture, and The frozen mixture is subjected to freeze-d...

Embodiment 1

[0050] The preparation method of the boron nitride microsheet airgel ball provided by embodiment 1 refers to the attached figure 1 shown, including the following specific steps:

[0051] S11: Mix boron nitride microflakes with a size of 500nm, sodium carboxymethyl cellulose, sodium chloride, and water at a mass ratio of 1:0.2:0.05:10, and stir in a planetary mixer for 4 hours at a stirring speed of 70rpm to obtain Functionalized boron nitride microsheet slurry;

[0052] S12: Put the functionalized boron nitride microsheet slurry into the electrospray treatment device, the distance between the boron nitride microsheet slurry injection end and the collection device is 20 cm, and the distance between the filler slurry injection end and the collection device The voltage difference is 20kV, the propulsion rate of the automatic propulsion device is 1cm / min, and the diameter of the boron nitride microsheet slurry droplet is 180μm;

[0053] S13: drop the boron nitride microsheet slu...

Embodiment 2

[0057] The preparation method of the silicon carbide nanowire airgel sphere provided by embodiment 2 refers to the attached figure 1 shown, including the following specific steps:

[0058] S21: Mix silicon carbide nanowires with a diameter of 200 nm and a length of 10 μm, hydroxypropyl methylcellulose, potassium chloride, and water at a mass ratio of 1:0.05:0.05:20, and then stir in a planetary mixer for 3 hours at a stirring speed of Be 60rpm, obtain functionalized silicon carbide nanowire slurry;

[0059] S22: Put the functionalized silicon carbide nanowire slurry into the electrospray treatment device, the distance between the silicon carbide nanowire slurry injection end and the collection device is 10 cm, and the voltage difference between the filler slurry injection end and the collection device 22kV, the propulsion rate of the automatic propulsion device is 3cm / min, and the diameter of the silicon carbide nanowire slurry droplet is 100μm;

[0060] S23: Drop the silico...

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Abstract

The invention belongs to the technical field of nano porous materials, and discloses a size-controllable aerogel ball as well as a preparation method and application thereof. The preparation method ofthe aerogel ball comprises the following steps: mixing a filler, a viscosity regulator, salt and water according to a mass ratio of 1:(0.05-0.2):(0.025-0.05):(5-50) to obtain functionalized filler slurry; putting the functionalized filler slurry into an electronic injection treatment device to obtain filler slurry droplets with controllable diameters; dropwise adding a low-temperature refrigerating medium, carrying out freezing treatment to form a frozen mixture, and carrying out freeze drying treatment to obtain an aerogel ball precursor; and carrying out first and second sintering heat treatment on the aerogel ball precursor to obtain the aerogel ball. The aerogel ball is wide in applicable material range, controllable in aerogel size, simple in preparation process, relatively mild in reaction condition, high in yield, controllable in aerogel ball diameter and high in porosity, and has a good application prospect in various fields.

Description

technical field [0001] The invention belongs to the technical field of nanoporous materials, and in particular relates to a size-controllable airgel ball and its preparation method and application. Background technique [0002] As a new type of porous material, airgel spheres have broad application prospects in the fields of energy storage, sensors, biological tissue engineering, and environmental protection due to their large specific surface area, ordered microstructure, and adjustable pore size. has received widespread attention in recent years. At the same time, airgel balls can also be used as a thermal conductive filler. The airgel balls are essentially aerogels, which can form a macroscopic three-dimensional heat conduction network after interconnection to improve the thermal conductivity of composite materials. How to effectively control the regularity and size has always been a key technical issue in the preparation of airgel spheres. The microstructure of airgel ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/064C01B32/956C01F7/02C01G9/02B01J13/00
CPCC01B21/0648C01B32/956C01F7/026C01G9/02B01J13/0091C01P2006/10C01P2006/12C01P2004/32C01P2004/61C01P2004/60
Inventor 么依民孙蓉曾小亮任琳琳张涛许建斌
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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