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Process for continuously preparing meso visual ordered hybridization silicon dioxide fiber

A technology of silica and hybridization, which is applied in the direction of silica, silica, glass manufacturing equipment, etc., can solve the problems of inability to continuously produce silica fibers, etc., and achieve good mass transfer performance and good stability.

Inactive Publication Date: 2004-07-14
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, none of these methods can continuously produce silica fibers

Method used

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  • Process for continuously preparing meso visual ordered hybridization silicon dioxide fiber
  • Process for continuously preparing meso visual ordered hybridization silicon dioxide fiber
  • Process for continuously preparing meso visual ordered hybridization silicon dioxide fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1: Continuous preparation of mesoscopically ordered silica fibers

[0044] Mix 208 parts by weight of tetraethyl orthosilicate, 156 parts by weight of ethanol, 36 parts by weight of water, 0.63 parts by weight of nitric acid, and 55 parts by weight of cetyltrimethylammonium bromide, and reflux at 50°C for 90 minutes under electromagnetic stirring , to obtain light yellow transparent silica sol. The prepared silica sol was exposed to a water bath at 70° C. and heated for 2.5 hours until the viscosity increased to form a pre-gel. The silica pregel was extruded through a porous spinneret (the diameter of the hole was 20 μm), and 2×10 5 Stretch in a high-voltage electrostatic field of V / m, and obtain continuous silica fibers after drying. Place the fibers in a sintering furnace with air, and burn them at a rate of 1°C / min to 450°C for 3 hours to remove Surfactants to obtain mesoscopically ordered nanoporous silica fibers with a fiber diameter of 400nm. The result...

Embodiment 2

[0045] Example 2: Continuous preparation of mesoscopically ordered silica fibers

[0046] 208 parts by weight of tetraethyl orthosilicate, 180 parts by weight of ethanol, 30 parts by weight of water, 0.48 parts by weight of nitric acid, Brij-58{CH 3 (CH 2 ) 15 (OCH 2 CH 2 ) 20 52 parts by weight of OH} were mixed evenly, and refluxed at 60°C for 90 minutes under electromagnetic stirring to obtain a colorless and transparent silica sol. Silica fibers were prepared according to the steps in Example 1, with a spinneret hole diameter of 10 μm and a fiber diameter of 320 nm. The results of X-ray diffraction and transmission electron microscopy show that the ordered nanopores are in a cubic arrangement with a pore size of 4 nm, and the results of nitrogen adsorption show that the specific surface area of ​​the fiber is 710 m 2 / g. like figure 2 shown.

Embodiment 3

[0047] Example 3: Continuous preparation of mesoscopically ordered silica fibers

[0048] 208 parts by weight of tetraethyl orthosilicate, 230 parts by weight of ethanol, 18 parts by weight of water, 0.6 parts by weight of nitric acid, Pluronic-123{PEO 20 -PPO 70 -PEO 20} 48 parts by weight were mixed evenly, and refluxed at 60° C. for 90 minutes under electromagnetic stirring to obtain a colorless and transparent silica sol. Mesoscopically ordered silica fibers were prepared according to the steps of Example 1, but no electric field was applied, and the fibers were formed by mechanical stretching. The spinneret hole diameter was 100 μm, the stretching rate was 30 cm / min, and the fiber diameter was 5 μm. The results of X-ray diffraction and transmission electron microscopy show that the ordered nanopores are in a cubic arrangement with a pore size of 4 nm, and the results of nitrogen adsorption show that the specific surface area of ​​the fiber is 620 m 2 / g. like image ...

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Abstract

The present invention relates to meso visual ordered hybridized silicon dioxide fiber, and is especially sol-gel process of continuously spinning meso visual ordered hybridized silicon dioxide fiber with high strength and great specific surface area and the process of compounding derivative with optical, electric and magnetic characteristic and catalytic activity. The present invention combines solvent evaporating, surfactant self-organization inducing and silica sol-gel process, continuous spinning process to prepare hybridized silicon dioxide fiber, and high temperature sintering or solvent extracting to eliminate surfactant and to obtain meso visual ordered hybridized silicon dioxide fiber. Via controlling the molecular structure and concentration of surfactant, the continuous regulation of meso visual structure and size may be realized. The fiber of the present invention has excellent mass transferring performance as well as high strength and high size stability.

Description

technical field [0001] The invention relates to a mesoscopically ordered hybrid silica fiber, in particular to a mesoscopically ordered hybrid silica fiber with high strength and high specific surface area combined with sol-gel technology for continuous spinning, and composite optical, Methods for derivatives of electrically, magnetically and catalytically active species. Background technique [0002] Mesoscopically ordered materials are an important research direction of nanomaterials, which refer to the use of surfactants as templates and the use of physical and chemical processes such as sol / gel, emulsification or microemulsion to assemble them through the interface between organic and inorganic substances. A kind of porous material with a pore size between 1.3-30nm, a narrow pore size distribution and a regular pore channel structure generated by a synergistic chemical reaction. In addition to the properties of nanomaterials, mesoscopically ordere...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12C03B37/01D01F9/08
Inventor 杨振忠杨正龙
Owner INST OF CHEM CHINESE ACAD OF SCI
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