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Potassium titanate nanowire and preparation method thereof

A nanowire, potassium titanate technology, applied in nanotechnology, chemical instruments and methods, titanium compounds, etc., can solve problems such as uneven morphology

Inactive Publication Date: 2013-05-15
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the transmission electron microscope photos in the above literature, only a few nanowires have a small diameter of about 15 nanometers, but most of the nanowires have a diameter between 20 and 30 nanometers, and their appearance is not uniform.
At present, highly dispersed potassium octatitanate (K2Ti8O17) nanowires with a diameter of less than 10 nm and uniform morphology have not been reported.

Method used

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  • Potassium titanate nanowire and preparation method thereof
  • Potassium titanate nanowire and preparation method thereof
  • Potassium titanate nanowire and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 15 milliliters of titanium sulfate to 130 milliliters of 3 mol / L potassium hydroxide alcoholic solution (volume percentage of ethanol is 20%), stir vigorously to make it evenly mixed while the titanium sulfate is rapidly hydrolyzed. Then the suspension was put into a 200 ml Teflon-lined stainless steel autoclave and reacted at 393K for 60 hours. After the reaction is finished, the precipitated product is washed with deionized water and dilute hydrochloric acid until the washing solution is close to neutral, and dried to obtain potassium titanate nanowires.

[0024] The crystal form of the obtained potassium titanate nanowires is consistent with the standard powder diffraction card (JCPDS: 41-1100). The diameter of the nanowires is about 6 nanometers, the length is between 100 and 800 nanometers, and the purity is more than 99%.

Embodiment 2

[0026] Add 8 ml of n-tetrabutyl titanate to 65 ml of potassium hydroxide alcoholic aqueous solution with a concentration of 5 mol / L (volume percentage of ethanol is 10%), stir vigorously while n-tetrabutyl titanate is rapidly hydrolyzed to make it evenly mixed . Then the suspension was put into a 100 ml Teflon-lined stainless steel autoclave and reacted at 423K for 48 hours. After the reaction is finished, the precipitated product is washed with deionized water and dilute hydrochloric acid until the washing solution is close to neutral, and dried to obtain potassium titanate nanowires.

[0027] The crystal form of the obtained potassium titanate nanowires is consistent with the standard powder diffraction card (JCPDS: 41-1100). The diameter of the nanowires is about 7 nanometers, the length is between 100 and 1000 nanometers, and the purity is over 99%.

Embodiment 3

[0029] Add 4 ml of isopropyl titanate to 35 ml of potassium hydroxide alcoholic aqueous solution with a concentration of 2 mol / L (the volume percentage of ethanol is 15%), stir vigorously to mix evenly while the isopropyl titanate is rapidly hydrolyzed . Then the suspension was put into a 50 ml Teflon-lined stainless steel autoclave and reacted at 413K for 48 hours. After the reaction is finished, the precipitated product is washed with deionized water and dilute hydrochloric acid until the washing solution is close to neutral, and dried to obtain potassium titanate nanowires.

[0030] The crystal form of the obtained potassium titanate nanowires is consistent with the standard powder diffraction card (JCPDS: 41-1100). The diameter of the nanowires is about 5 nanometers, the length is between 200 and 800 nanometers, and the purity is more than 99%.

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Abstract

The invention relates to a potassium titanate nanowire and a preparation method thereof. The potassium titanate nanowire has a potassium octatitanate (K2Ti8O17) crystal form, diameter between 4 and 9 nm, length between 100 and 1000 nm, and uniform morphology. The preparation method of the potassium titanate nanowire is characterized by comprising the following steps: (1) adding a solid or liquid titanium source into an alcohol-water solution of potassium hydroxide, and rapidly stirring to form a homogeneous suspension; (2) placing the suspension obtained in the step (1) into stainless steel autoclave with a polytetrafluoroethylene lining, and subjecting the suspension to a hydrothermal treatment for 24-72 h at temperature of 373-473K; and (3) after the reaction, washing the precipitate product with deionized water and dilute hydrochloric acid until a washing fluid reaches a neutral state, and drying to obtain the potassium titanate nanowire. The preparation method has simple process and flow, wide parameter adjustable range, strong repeatability and low cost, and shows a commercial prospect.

Description

technical field [0001] The invention relates to a potassium titanate nanowire and a preparation method thereof, in particular to a potassium titanate nanowire with a diameter less than 10 nanometers and a high aspect ratio, belonging to the technical field of inorganic nanometer materials and synthesis. Background technique [0002] Potassium titanate nanowire is a composite reinforced nanofiber with excellent performance. It has good mechanical and physical properties, and also has high electrical insulation and heat resistance (1200 oC in air). The expansion coefficient is equivalent to that of plastics, and the composite reinforced plastics have good compatibility and exhibit good wear resistance and lubricity. It has been widely used in engineering plastics, friction materials, heat insulation, insulation materials and other fields. [0003] At present, a certain number of literatures have reported the preparation methods of potassium titanate nanowires. However, the d...

Claims

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Application Information

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IPC IPC(8): C01G23/00B82Y40/00
Inventor 赵斌林琳陈超何丹农
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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