Anisotropic silicon dioxide aerogel with birefringent effect and preparation method thereof

An anisotropic, silicon dioxide technology, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., to achieve the effect of simple process and easy operation

Active Publication Date: 2022-05-13
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] In summary, external compression, directional freezing and changing the pH value of the reaction can make the airgel have a certain anisotropy. less

Method used

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  • Anisotropic silicon dioxide aerogel with birefringent effect and preparation method thereof
  • Anisotropic silicon dioxide aerogel with birefringent effect and preparation method thereof
  • Anisotropic silicon dioxide aerogel with birefringent effect and preparation method thereof

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preparation example Construction

[0038] The invention provides a preparation method of anisotropic silica airgel with birefringence effect, such as figure 1 As shown, it specifically includes the following steps:

[0039] Step 1, mixing methyl orthosilicate and methanol evenly to obtain mixed solution A;

[0040] In step 1, the volume ratio of methyl orthosilicate and methanol is 10:80-100.

[0041] Step 2, add dilute ammonia water dropwise to the mixed solution A obtained in step 1, stir magnetically for 0.5-1h, and mix evenly to obtain precursor sol B;

[0042] In step 2, the concentration of dilute ammonia water is 0.003-0.005M, and the volume ratio of dilute ammonia water and methyl orthosilicate used in step 1 is 2.4:10.

[0043] Step 3, transfer the precursor sol B obtained in step 2 to a stainless steel container, the axis of the quartz tube is parallel to the axis of the stainless steel container, put a stainless steel cover on the cylindrical stainless steel container, and let it stand for 3-4d, an...

Embodiment 1

[0051] The volume ratio of methyl orthosilicate and methanol is 10:80, the concentration of dilute ammonia water is 0.004M, exhaust at a depressurization rate of 5MPa / h, and heat the supercritical drying kettle at a heating rate of 10°C / h to Silica airgel prepared after drying at 280°C.

[0052] First, mix methyl orthosilicate and methanol evenly according to the volume ratio of 10:80 to obtain mixed solution A;

[0053] Secondly, according to the volume ratio of dilute ammonia water and orthosilicate methyl ester of 2.4:10, add dilute ammonia water with a concentration of 0.004M to the mixed solution A dropwise, magnetically stir for 0.5h, and mix uniformly to obtain the precursor sol B;

[0054] Third, transfer the precursor sol B to a stainless steel container with a quartz tube placed in advance. The inner diameter of the stainless steel container is 80 mm, the inner height is 50 mm, and the wall thickness is 5 mm. The inner diameter of the quartz tube is 8 mm, and the len...

Embodiment 2

[0058] The volume ratio of methyl orthosilicate and methanol is 10:100, the concentration of dilute ammonia water is 0.004M, exhaust at a depressurization rate of 5MPa / h, and heat the supercritical drying kettle at a heating rate of 10°C / h to Silica airgel prepared after drying at 280°C.

[0059] First, mix methyl orthosilicate and methanol evenly according to the volume ratio of 10:100 to obtain mixed solution A;

[0060] Secondly, according to the volume ratio of dilute ammonia water and orthosilicate methyl ester of 2.4:10, add dilute ammonia water with a concentration of 0.004M to the mixed solution A dropwise, magnetically stir for 0.5h, and mix uniformly to obtain the precursor sol B;

[0061] Third, transfer the precursor sol B to a stainless steel container with a quartz tube placed in advance. The inner diameter of the stainless steel container is 80 mm, the inner height is 50 mm, and the wall thickness is 5 mm. The inner diameter of the quartz tube is 8 mm, and the l...

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Abstract

The invention discloses a preparation method of anisotropic silicon dioxide aerogel with a birefringence effect, which specifically comprises the following steps: step 1, uniformly mixing tetramethyl orthosilicate and methanol to obtain a mixed solution A; step 2, dropwise adding dilute ammonia water into the mixed solution A, and uniformly mixing to obtain precursor sol B; step 3, transferring the precursor sol B into a stainless steel container, carrying out pouring molding in a quartz tube, and curing the gel to obtain methanol gel; step 4, heating and pressurizing the stainless steel container together with the methanol gel in a supercritical drying kettle, so that a methanol medium in the gel is converted into a supercritical state; and step 5, opening a gas outlet valve of the supercritical drying kettle for deflation, increasing the temperature of the kettle body, stopping heating after deflation, and naturally cooling the supercritical drying kettle to room temperature. The invention further discloses the anisotropic silicon dioxide aerogel with the birefringence effect, and the anisotropic silicon dioxide aerogel shows the obvious birefringence characteristic in a polarized light transmission light path.

Description

technical field [0001] The invention belongs to the technical field of material preparation and structure regulation, and specifically relates to an anisotropic silica airgel with a birefringence effect, and also relates to an anisotropic silica airgel with a birefringence effect. Preparation. Background technique [0002] Since the advent of silica aerogels, there has been growing interest in this new type of porous material. Airgel has a unique nanoporous structure and has a wide range of applications in many scientific and engineering fields such as high-energy physics, astronomy, materials science, condensed matter physics, and chemistry. Airgel has extremely high porosity and specific surface area, and its unique porous structure leads to its extremely low thermal conductivity, which is a very good thermal insulation material. Silica aerogels with a porosity of more than 98% usually have important applications in the study of supercritical phenomena of quantum fluids ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/158
CPCC01B33/1585C01P2004/03C01P2004/62Y02P20/54
Inventor 沈洋李恩玲马德明成凤娇崔真袁志浩
Owner XIAN UNIV OF TECH
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