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Method of preparing silicon oxide nano-filament using fast heating decomposition of organic siloxane

An organosiloxane, rapid heating technology, applied in silicon oxide, silicon dioxide, nanotechnology and other directions, can solve the problems of long thermal oxidation time, high reaction temperature, slow growth rate of silicon oxide nanowires, etc., to achieve growth efficiency high effect

Inactive Publication Date: 2007-10-10
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It has been reported to use high-temperature thermal oxidation of silicon substrates and high-temperature solid-state decomposition of silicon monoxide under the condition of external catalyst or no catalyst. They use silicon oxide wafer or silicon monoxide as the substrate, and then plate a layer on the substrate. Au film, put the coated substrate into a quartz boat, send it into a tube furnace for vacuum heating, so as to obtain silicon oxide nanowires, but this method uses refractory oxides as raw materials, and the reaction temperature is relatively high. (1200°C), the thermal oxidation time is very long, and the growth rate of silicon oxide nanowires is slow, so the yield is low

Method used

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  • Method of preparing silicon oxide nano-filament using fast heating decomposition of organic siloxane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Embodiment 1: A quartz tube reactor and a tubular heating furnace are used, both ends of the quartz tube are sealed with flanges, vacuumed to 1000 Pa, and the quartz tube is heated to 1100°C under flowing 200ml / min argon gas. The cold end of the quartz tube is loaded with a metal sample feeder with a viscosity of 5cSt and a molecular weight of 770g / mol polydimethylsiloxane (50g) into the high temperature zone, and the moving speed of the sample rod is 20cm / s. The heating rate is 1000°C / S, and it stops when it reaches the temperature range of 1100°C. Polydimethylsiloxane gathers, gasifies and decomposes, and grows into a white cotton-like product in situ. The whole reaction process is completed within 1 second. The product is analyzed by a scanning electron microscope to be a fiber with a diameter of 50-200 nm and a length of 10-500 μm. The transmission electron microscope analysis shows that the fiber is a single-phase amorphous structure, as shown in the accompanying d...

Embodiment 2

[0008] Embodiment 2: A quartz tube reactor and a tubular heating furnace are used, the two ends of the quartz tube are sealed with flanges, the vacuum is evacuated to 1000 Pa, and the quartz tube is heated to 1100 degrees under flowing 200ml / min argon gas. The metal sample feeder loaded with polydimethylsiloxane with a viscosity of 5cSt and a molecular weight of 770g / mol at the cold end of the Shiying tube is quickly pushed into the high temperature zone, the moving speed of the sample feed rod is 20cm / s, and the corresponding heating rate 1000°C / S, stop when it reaches the temperature range of 900°C, polydimethylsiloxane accumulates, gasifies and decomposes, and grows into a white cotton-like product in situ. The product is analyzed by a scanning electron microscope to be a fiber with a diameter of 50-200 nm and a length of 10-500 μm. Infrared spectrum analysis shows that the fiber product is pure silica phase.

Embodiment 3

[0009] Embodiment 3: A quartz tube reactor and a tube heating furnace are used, the two ends of the quartz tube are sealed with flanges, the vacuum is evacuated to 1 Pa, and the quartz tube is heated to 1100°C under flowing 200ml / min argon gas. The metal sample feeder loaded with polydimethylsiloxane with a viscosity of 100cSt and a molecular weight of 6000g / mol at the cold end of the Shiying tube is quickly pushed into the high temperature zone, the moving speed of the sample feeder is 20cm / s, and the corresponding heating rate 1000°C / S, stop when it reaches the temperature range of 1100°C, polydimethylsiloxane accumulates, gasifies and decomposes, and grows into a white cotton-like product in situ. The product is analyzed by a scanning electron microscope to be a fiber with a diameter of 50-200 nm and a length of 10-500 μm. Infrared spectrum analysis shows that the fiber product is pure silica phase.

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Abstract

This invention relates to a kind of process which is fast heating decompose organism silicone to prepare oxide nanometer line. It includes steps as follows: use electric energy, laser or plasma as heat source to heat the surrounding to 500-2000DEG C; put polydimethylsiloxane in single air of argon, nitrogen gas, helium gas or hydrogen or mixture of them at above temperature, lift the temperature at rate of 100-2000DEG C / S, then quickly form silicon oxide nanometer line. the diameter is 1-10000nm and length is 1-500 micron. The forte is polymer gasification and nanometer lines grow complete in seconds.

Description

technical field [0001] The invention relates to a method for rapidly heating and decomposing organosiloxane to prepare silicon oxide nanowires, which belongs to the preparation technology of silicon oxide nanowires. Background technique [0002] Silicon oxide nanowires have important application prospects in the preparation of composite materials, thermal insulation materials, multifunctional textile fibers, nano / submicron optical circuits, optical, electrical and biosensors, and many other fields. However, the widespread application of silicon oxide nanowires requires a high-yield preparation technology for silicon oxide nanowires. But there is still a lack of a simple and feasible preparation technology. The traditional melt drawing method can obtain thicker silica fibers with a diameter of tens to hundreds of microns. It has been reported to use high-temperature thermal oxidation of silicon substrates and high-temperature solid-state decompos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/113C01B33/12B82B3/00
Inventor 李亚利范华
Owner TIANJIN UNIV