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Method for directionally arranging halloysite nanotubes on large scale

A technology of halloysite nanotubes and directional alignment, applied in nanotechnology, nanotechnology, nanostructure manufacturing, etc., can solve the problems of not having large-scale orientation, achieve good modification effect, simple purification process, and improve dispersibility Effect

Inactive Publication Date: 2020-12-18
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above preparation methods do not have the effect of large-scale orientation of halloysite in the same direction

Method used

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  • Method for directionally arranging halloysite nanotubes on large scale
  • Method for directionally arranging halloysite nanotubes on large scale
  • Method for directionally arranging halloysite nanotubes on large scale

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] (1) select the halloysite nanotube of length 800-1000nm, tube inner diameter 20-30nm and tube outer diameter 50-70nm as raw material;

[0057] (2) Disperse 10g halloysite nanotubes in 1000mL deionized water and stir for 1h, let it stand for 10min, take the supernatant, obtain pure halloysite nanotubes by ultrasonication, centrifugation and drying, wherein ultrasonication is 30min, and the ultrasonic frequency is 25KHz;

[0058] (3) Get dried halloysite nanotubes 2g and sodium hexametaphosphate 2g and add them into 200ml deionized water respectively, after stirring at room temperature for 24h, let stand for 3h to precipitate aggregates and impurities, collect the supernatant, centrifuge and wash for 3- After drying for 4 times, the modified halloysite nanotubes are obtained;

[0059] (4) Disperse 300 mg of modified halloysite nanotubes in 30 mL of solution (water: 98%, ethanol: 2%), and ultrasonicate for 30 minutes at an ultrasonic frequency of 25 KHz to obtain a disper...

Embodiment 2

[0063] (1) select the halloysite nanotube of length 800-1000nm, tube inner diameter 20-30nm and tube outer diameter 50-70nm as raw material;

[0064] (2) Disperse 10g halloysite nanotubes in 1000mL deionized water and stir for 1h, let it stand for 10min, take the supernatant, obtain pure halloysite nanotubes by ultrasonication, centrifugation and drying, wherein ultrasonication is 20min, and the ultrasonic frequency is 35KHz;

[0065] (3) Add 2 g of dried halloysite nanotubes and 1 g of sodium hexametaphosphate into 200 ml deionized water, stir at room temperature for 20 h, let stand for 1 h to precipitate aggregates and impurities, collect the supernatant, centrifuge and wash for 3- After drying for 4 times, the modified halloysite nanotubes are obtained;

[0066] (4) Disperse 300 mg of modified halloysite nanotubes in 30 mL of solution (water: 98%, ethanol: 2%), and ultrasonicate for 20 minutes at a frequency of 35 KHz to obtain a dispersion;

[0067] (5) Adjust the pH of ...

Embodiment 3

[0070] (1) select the halloysite nanotube of length 800-1000nm, tube inner diameter 20-30nm and tube outer diameter 50-70nm as raw material;

[0071] (2) Disperse 10g halloysite nanotubes in 1000mL deionized water and stir for 1h, let it stand for 10min, take the supernatant, obtain pure halloysite nanotubes by ultrasonication, centrifugation and drying, wherein ultrasonication is 40min, and the ultrasonic frequency is 30KHz;

[0072] (3) Get dried halloysite nanotubes 2g and sodium hexametaphosphate 5g and add them into 200ml deionized water, after stirring at room temperature for 26h, let stand for 4h to precipitate aggregates and impurities, collect the supernatant, centrifuge and wash for 3- After drying for 4 times, the modified halloysite nanotubes are obtained;

[0073] (4) Disperse 300 mg of modified halloysite nanotubes in 30 mL of solution (water: 98%, ethanol: 2%), and ultrasonicate for 40 min at a frequency of 30 KHz to obtain a dispersion;

[0074] (5) Adjust th...

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Abstract

The invention belongs to the field of self-assembly of halloysite nanotubes, and particularly relates to a method for directionally arranging halloysite nanotubes on a large scale. The method comprises the steps that halloysite nanotubes are subjected to material selection, purification, modification, dispersion and directional arrangement, the directional arrangement comprises the steps that thepH value of dispersion liquid obtained after dispersion is adjusted, then the dispersion liquid is placed in a container with a vertically-placed substrate, isothermal evaporation is conducted, and the large-scale directional halloysite nanotubes deposited on the substrate are obtained. According to the method, the halloysite nanotubes are modified by adopting sodium hexametaphosphate, and then the large-scale directionally-arranged halloysite nanotubes are obtained through isothermal evaporation, so that the method is convenient to operate and simple in process.

Description

technical field [0001] The invention belongs to the field of self-assembly of halloysite nanotubes, in particular to a method for aligning halloysite nanotubes on a large scale. Background technique [0002] As a natural tubular clay mineral, halloysite nanotubes have attracted extensive attention due to their excellent structure and properties, and have high development and research value. Halloysite nanotubes have nanoscale length and diameter, hollow nanotube structure with open ends, large aspect ratio, the length distribution is in the range of 400-1500nm, and the inner and outer diameters are about 10-30nm respectively , 50-100nm, chemical Al 2 Si 2 o 5 (OH) 4 ·nH 2 O(n=0 or 2). The wall of halloysite nanotubes is composed of several layers of layered structural units, which are composed of outer silicon-oxygen tetrahedrons and inner aluminum-oxygen octahedrons. The outer surface of HNTs is mainly composed of Si-O-Si bonds, and the inner surface is mainly compose...

Claims

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Application Information

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IPC IPC(8): B82B3/00B82Y40/00B82Y30/00B82B1/00
CPCB82B1/00B82B3/00B82Y30/00B82Y40/00
Inventor 徐培杰程宏飞
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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