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Flexible boron nitride nano-belt aerogel and preparation method therefor

A boron nitride and nanobelt technology, applied in aerogel preparation, gel preparation, chemical instruments and methods, etc., can solve the mechanical strength of boron nitride aerogel weak and brittle, and the thermal stability of boron nitride aerogel. It has the advantages of good resilience, low cost and easy operation.

Active Publication Date: 2019-05-03
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the introduction of polymer crosslinking agents, the thermal stability of the obtained boron nitride aerogels drops sharply, which cannot meet the maintenance of excellent mechanical properties at high temperatures.
The boron nitride airgel prepared by small molecule precursor method has a series of problems such as weak mechanical strength and brittleness
Therefore, the preparation of flexible boron nitride airgel is still a difficult problem.

Method used

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  • Flexible boron nitride nano-belt aerogel and preparation method therefor

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preparation example Construction

[0054] Another aspect of the embodiment of the present invention also provides a method for preparing flexible boron nitride nanoribbon airgel, which mainly includes: dissolving boric acid and nitrogen-containing precursor small molecules at high temperature to obtain a transparent precursor solution; Ultrasonic and cooling to obtain precursor hydrogel, followed by specific drying method and high temperature pyrolysis to obtain flexible boron nitride nanoribbon aerogel.

[0055] Specifically, the preparation method of the flexible boron nitride nanoribbon aerogel provided by the invention includes:

[0056] 1) Dissolving boric acid and nitrogen-containing precursors in a solvent at high temperature to obtain a transparent precursor solution;

[0057] 2) cooling the precursor solution to obtain a precursor hydrogel;

[0058] 3) drying the precursor hydrogel to obtain a precursor aerogel;

[0059] 4) In a protective atmosphere, the precursor airgel is subjected to high-tempera...

Embodiment 1

[0073] (a) Add 0.03 mol of boric acid and 0.003 mol of melamine into 100 mL of methanol solution, and stir in a water bath at 65°C until the solution system becomes transparent.

[0074] (b) The transparent solution in step (a) was ultrasonically treated at 0.1 W for 30 min at 5° C. to obtain a white boric acid / melamine hydrogel.

[0075] (c) Place the white boric acid / melamine hydrogel in step (b) in a freeze dryer, and freeze-dry for 24 hours to obtain the boric acid / melamine hydrogel.

[0076] (d) The boric acid / melamine airgel in step (c) was subjected to high-temperature pyrolysis treatment for 12 hours at 600° C. under an argon / ammonia atmosphere to obtain flexible boron nitride nanoribbon airgel.

[0077] The structure and performance characterization data of the airgel obtained in this example are as follows: After BET testing, the specific surface area of ​​the boron nitride nanoribbon airgel is 980m 2 / g, the pore size distribution is 0.5-50nm, and its SEM structure...

Embodiment 2

[0079] (a) Add 0.15mol boric acid and 0.45mol melamine to 175mL water / ethanol mixed solution (volume ratio of water and ethanol 10:1), and stir in a water bath environment at 90°C until the solution system becomes transparent.

[0080] (b) The transparent solution in step (a) was ultrasonically treated for 10 h at 55° C. under a power of 10,000 W to obtain a white boric acid / melamine hydrogel.

[0081] (c) Place the white boric acid / melamine hydrogel in the step (b) in an oven at 65° C. and let it dry for 24 hours to obtain the boric acid / melamine hydrogel.

[0082] (d) pyrolyzing the boric acid / melamine airgel in step (c) at 1500° C. under a nitrogen atmosphere for 24 hours to obtain flexible boron nitride nanoribbon airgel.

[0083] The scanning electron microscope (SEM) photo of the obtained boron nitride nanoribbon airgel of the present embodiment is as follows figure 2 The relevant physical parameters are shown in Table 1.

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Abstract

The invention discloses flexible boron nitride nano-belt aerogel and a preparation method therefor. The flexible boron nitride nano-belt aerogel has a communicating three-dimensional porous network structure, wherein the three-dimensional porous network structure is formed through interwinding and lapping boron nitride nano-belts and is made of macropores with a pore size greater than 50nm, mesopores with a pore size of 2nm to 50nm and micropores with a pore size smaller than 2nm. The preparation method comprises the steps of subjecting boric acid and a nitrogen-containing precursor to high-temperature digestion so as to form a transparent precursor solution, then, preparing precursor aquagel, and then, carrying out drying and high-temperature pyrolysis, thereby obtaining the flexible boron nitride nano-belt aerogel. The boron nitride nano-belt aerogel disclosed by the invention has excellent flexibility and elasticity restorability, can bear outside loads of different forms in a widetemperature range and is restorable in elasticity; and the preparation process is mild in reaction conditions, easy in operation and low in cost, is concise, environmentally friendly and pollution-free and can achieve continuous production.

Description

technical field [0001] The invention relates to a flexible boron nitride nanobelt aerogel and a preparation method thereof, belonging to the technical field of nano energy. Background technique [0002] Airgel is a low-density solid material with a continuous three-dimensional porous network structure in which the dispersion medium is gas. Since 1932, American chemist Samuel Stephens Kistler first used supercritical fluid drying technology to prepare "solid smoke" - silica aerogel, aerogel as a new member of the material family has attracted people's attention and research. With the development of nearly a century, a series of aerogels with different materials, structures and properties have been synthesized one after another, such as silica aerogels derived from various alkoxysilanes, metal oxide aerogels (TiO 2 、Al 2 o 3 , ZrO 2 etc.), metal airgel (such as gold), polymer airgel (polyaniline, polypyrrole, polyimide, etc.), carbon aerogel and new nano-carbon aerogel (gr...

Claims

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Application Information

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IPC IPC(8): C01B21/064B82Y40/00
CPCB82Y40/00C01B21/0646C01P2004/17C01P2004/03C01P2004/04B82Y30/00C01P2006/10C01P2006/12C01P2006/32C01P2006/14C01P2006/16B01J13/0065B01J13/0091C01P2004/24C01P2006/17C01P2006/90
Inventor 张学同李广勇
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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