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Light silicon dioxide aerogel with ultrahigh transparency and ultralow haze as well as preparation method and application of light silicon dioxide aerogel

A light-weight silica and transparency technology, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problem of not paying enough attention to the light transmission of airgel, achieve precise control of the reaction environment, and avoid heavy Poor performance and stability, weak scattering effect

Active Publication Date: 2021-08-20
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, as early as 1968, Teichner discovered that silica aerogels prepared by methyl orthosilicate had a certain light transmittance, but did not pay enough attention to the light transmittance of airgel in the early stage

Method used

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  • Light silicon dioxide aerogel with ultrahigh transparency and ultralow haze as well as preparation method and application of light silicon dioxide aerogel
  • Light silicon dioxide aerogel with ultrahigh transparency and ultralow haze as well as preparation method and application of light silicon dioxide aerogel
  • Light silicon dioxide aerogel with ultrahigh transparency and ultralow haze as well as preparation method and application of light silicon dioxide aerogel

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preparation example Construction

[0033] In a first aspect, the present invention provides a method for preparing a lightweight silica aerogel with ultra-high transparency and ultra-low haze, said method comprising the steps of:

[0034] (1) Microreactor device (also denoted as microfluidic droplet microreactor device) is provided: the microreactor device includes a PDMS microfluidic chip and an ITO electrode connected to the PDMS microfluidic chip; The PDMS microfluidic chip includes a first region, a second region, a third region, a fourth region and a fifth region connected in sequence, and the ITO electrode is connected to the fourth region of the PDMS microfluidic chip; In the present invention, along with the flow direction of the silicon source precursor (also referred to as the silicon source precursor phase) and the fluorocarbon oil (also referred to as the fluorocarbon oil phase), the first region, the second region, the third region, The fourth area and the fifth area, in the present invention, the ...

Embodiment 1

[0065] ①Provide a microreactor device; weigh 15.2g (0.1mol) of methyl orthosilicate, 7.2g (0.4mol) of water and 64g (2mol) of methanol, mix well as the silicon source precursor phase, and use a syringe to extract the silicon source precursor Phase 10mL, and at the inlet of the silicon source precursor in the microreactor device, introduce the silicon source precursor phase through the injection side channel. Use a syringe to extract 50 mL of perfluorocarbon oil (fluorocarbon oil) as the oil phase, and introduce the perfluorocarbon oil through the injection side channel at the inlet of the fluorocarbon oil in the microreactor device. Utilize a syringe to extract 5 mL of dilute hydrochloric acid (catalyst) with a concentration of 0.1 mol / L, and introduce the dilute hydrochloric acid through the injection side channel at the catalyst inlet in the microreactor device.

[0066] ②The first area of ​​the PDMS microfluidic chip included in the microreactor device includes the inlet of...

Embodiment 2

[0075] Embodiment 2 is basically the same as Embodiment 1, the difference is:

[0076] In step ①, weigh 15.2g (0.1mol) of methyl orthosilicate, 3.6g (0.2mol) of water and 38.4g (1.2mol) of methanol (the molar ratio of silicon source, water and methanol is 1:2:12 ), mixed uniformly as the silicon source precursor phase.

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Abstract

The invention relates to light silicon dioxide aerogel with ultrahigh transparency and ultralow haze as well as a preparation method and application of the light silicon dioxide aerogel. The method comprises the steps of preparing a microreactor; preparing ultra-small silica sol in the microreactor by adjusting the flow velocity of a silicon source precursor, fluorocarbon oil and a catalyst phase and the pipeline reaction temperature; quickly stirring a mixture containing silica sol liquid drops and an oil dispersion phase, standing for layering, quickly freezing, and separating out a silica sol phase; and adding a gel accelerator into the silica sol to obtain wet gel, and carrying out aging, solvent replacement and supercritical drying to obtain the light silica aerogel with ultrahigh transparency and ultralow haze. The nano-particle size of the prepared material is adjustable in a range of 5-10 nm, the highest light transmittance can reach 94.2%, the lowest haze can reach 4.7%, and the light silicon dioxide aerogel shows ultrahigh transparent quality and is widely applied to the fields of transparent heat insulation building glass, solar heat collection systems, Cherenkov detectors, deep space high-speed particle capture and the like.

Description

technical field [0001] The invention belongs to the technical field of nanoporous materials, and relates to a preparation method of silica airgel, in particular to a lightweight silica airgel with ultra-high transparency and ultra-low haze, a preparation method and application thereof. Background technique [0002] Airgel is a material with a three-dimensional nanoporous structure. It is generally recognized that it is a very good thermal insulation material and has been widely used in the field of thermal insulation requirements. In addition, as early as 1968, Teichner discovered that silica aerogels prepared by methyl orthosilicate had a certain degree of light transmission, but did not pay enough attention to the light transmission of aerogels in the early stage. The rapid development of the field of airgel in the past 50 years, as well as the current severe global climate problems and the urgent situation of energy conservation and emission reduction, have made scientist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/148C01B33/145
CPCC01B33/148C01B33/145C01P2004/03C01P2004/04C01P2006/60C01P2006/32C01P2006/10
Inventor 张晚林刘圆圆雷朝帅张恩爽戴晶鑫李文静张凡赵英民张昊
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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