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Method for synthesizing ultrathin hollow sphere micron zinc aluminate in one step by flame synthesis method

A flame synthesis, hollow sphere technology, applied in chemical instruments and methods, zinc compounds, inorganic chemistry, etc., can solve the problems of long synthesis time period, complicated operation steps, low product purity, etc. Simple steps and high thermal conductivity

Active Publication Date: 2021-01-12
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0005] In order to solve the problems of complex operation steps, low product purity and long synthesis time period in the existing synthesis method of hollow spherical zinc aluminate, the present invention provides a one-step synthesis of ultra-thin hollow spherical micron zinc aluminate by a flame synthesis method Methods

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  • Method for synthesizing ultrathin hollow sphere micron zinc aluminate in one step by flame synthesis method
  • Method for synthesizing ultrathin hollow sphere micron zinc aluminate in one step by flame synthesis method
  • Method for synthesizing ultrathin hollow sphere micron zinc aluminate in one step by flame synthesis method

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Embodiment 1

[0033] Step 1, Zn(NO 3 ) 2 ·6H 2 O and Al(NO 3 ) 3 9H 2 O was dissolved in 50 mL of water at a molar ratio of 0.75:2, and magnetically stirred at room temperature for 15 min to ensure that the two precursors were fully dissolved and mixed, and then the solution was poured into the atomization device.

[0034] Step 2, turn on the cooling water pump to keep the cooling substrate at a low temperature, then preheat the burner and the heating belt on the precursor pipeline to heat up to 130°C and 90°C respectively, and then inject nitrogen gas at 10.72SLPM.

[0035] Step 3: Introduce oxygen, ethylene, and nitrogen as a carrier gas successively. The flow rates are 3.8SLPM, 0.72SLPM, and 10.72SLPM respectively. After 10s, ignite the gas at the nozzle of the burner with an ignition gun. After a slight adjustment, the plane flame is within 3 minutes If they are all stable, the nitrogen used for atomization can be passed through. First, slowly increase the nitrogen used for atomiza...

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Abstract

The invention discloses a method for synthesizing an ultrathin hollow sphere micron zinc aluminate in one step by a flame synthesis method. According to the method, an aqueous solution of Zn(NO3)2.6H2O and Al(NO3)3.9H2O serves as a precursor solution, nitrogen serves as carrier gas, the precursor solution is fed into a high-temperature plane flame area formed by ethylene, oxygen and the carrier gas in a jet flow atomization mode, and zinc aluminate is rapidly deposited on a cooling substrate through the extremely large temperature gradient between high-temperature flame and a collecting plateunder the flame. The ultrathin hollow sphere micron zinc aluminate synthesized by the method is thin in sphere wall and large in middle cavity volume, has lower density and higher thermal resistance,and is suitable for the field of flame retardance and smoke abatement.

Description

technical field [0001] The invention relates to a method for synthesizing ultra-thin hollow spherical micron zinc aluminate in one step by a flame synthesis method, which belongs to the technical field of nanometer material preparation. Background technique [0002] Zinc aluminate is a ternary spinel oxide belonging to the Fd3m space group and a wide bandgap semiconductor with a close-packed face-centered cubic crystal structure. Because of its high melting point, stable chemical properties, excellent catalytic performance, optical, electrical properties and corrosion resistance, it is widely used in ceramics, optical components, electronic components, catalysts, humidity sensors and flame retardant materials. The application fields of zinc aluminate with different shapes and sizes are also different. For example, the intermediates prepared by Baochang Cheng et al. by co-precipitation method were annealed at 900°C, and the diameter was 100-200nm, and the length was several t...

Claims

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Application Information

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IPC IPC(8): C01G9/00
CPCC01G9/00C01P2004/34C01P2004/62C01P2002/72C01P2004/03C01P2004/04
Inventor 郭耸翁哲帆陈苗苗程洋
Owner NANJING UNIV OF SCI & TECH
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