A method of inducing the self-assembly of titanium dioxide nanoparticles to form a pearl chain structure

A nanoparticle, titanium dioxide technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of easy breakdown and destruction of devices, limiting the use range of nanoparticles and solvents, and high electric field strength, etc., to expand the use range, The effect of shortening the self-assembly time and reducing the electric field strength

Active Publication Date: 2017-03-22
SOUTH CHINA NORMAL UNIVERSITY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The limitations of this method are mainly reflected in two aspects: one is that the nanoparticles need to be dispersed in a highly polar solvent, which limits the scope of use of the nanoparticles and the solvent; the other is that the electric field strength is large, and it is easy to break down and destroy the device.

Method used

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  • A method of inducing the self-assembly of titanium dioxide nanoparticles to form a pearl chain structure
  • A method of inducing the self-assembly of titanium dioxide nanoparticles to form a pearl chain structure
  • A method of inducing the self-assembly of titanium dioxide nanoparticles to form a pearl chain structure

Examples

Experimental program
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Effect test

Embodiment 1

[0027] 1 Modification of titanium dioxide:

[0028] Disperse 0.2g of titanium dioxide nanoparticles in 0.3g of styrene and 0.015g of divinylbenzene and sonicate for 20min, then pour into a methanol solution of 2w / v% polyvinylpyrrolidone and sonicate for 20min, pour it into a three-necked flask after dispersion, and Under the protection of nitrogen, 0.01g of azobisisobutyronitrile was added to it, the stirring speed was 350r / min, after the temperature was raised to 65°C, nitrogen was blown and the reaction was stirred for 6h;

[0029] Then slowly add 0.03g of methyl methacrylate into the flask, maintain the stirring speed, and finish the reaction at 65°C for 12 hours. The reaction mixture is repeatedly washed with deionized and ethanol three times, and after vacuum drying, a white solid powder is obtained, which is the modified Titanium dioxide nanoparticles;

[0030]

[0031] Unmodified titanium dioxide particles adsorb cations, the colloidal particles are positively charg...

Embodiment 2

[0036] 1 Modification of titanium dioxide:

[0037] Disperse 0.5g of titanium dioxide nanoparticles in 0.5g of styrene and 0.04g of divinylbenzene and sonicate for 30min, then pour it into a methanol solution of 3w / v% polyvinylpyrrolidone and sonicate for 30min, pour it into a three-necked flask after dispersion, and Under the protection of nitrogen, 0.02g of azobisisobutyronitrile was added to it, the stirring speed was 500r / min, after the temperature was raised to 60°C, nitrogen was blown and the reaction was stirred for 8h;

[0038] Then slowly add 0.05g of methyl methacrylate into the flask, maintain the stirring speed, and finish the reaction at 60°C for 15 hours. The reaction mixture is repeatedly washed with deionized and ethanol three times, and after vacuum drying, a white solid powder is obtained, which is the modified Titanium dioxide nanoparticles;

[0039] 2 Self-assembled structures:

[0040]Disperse 0.01g of modified titanium dioxide nanoparticles in 15mL of n...

Embodiment 3

[0042] 1 Modification of titanium dioxide:

[0043] Disperse 0.2g of titanium dioxide nanoparticles in 0.4g of styrene and 0.03g of divinylbenzene and sonicate for 15min, then pour into a methanol solution of 4w / v% polyvinylpyrrolidone and sonicate for 15min, and pour it into a three-necked flask after dispersion. Under the protection of nitrogen, 0.01g of azobisisobutyronitrile was added to it, the stirring speed was 400r / min, after the temperature was raised to 70°C, nitrogen was blown and the reaction was stirred for 5h;

[0044] Then slowly add 0.04g of methyl methacrylate into the flask, maintain the stirring speed, and finish the reaction at 70°C for 10 hours. The reaction mixture is repeatedly washed with deionized and ethanol three times, and after vacuum drying, a white solid powder is obtained, which is the modified Titanium dioxide nanoparticles;

[0045] 2 Self-assembled structures:

[0046] Disperse 0.005g of modified titanium dioxide nanoparticles in 10mL of ca...

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Abstract

The invention relates to the preparation of a self-assembled structure, and discloses a method for inducing the self-assembly of titanium dioxide nanoparticles to form a pearl chain structure, specifically: titanium dioxide nanoparticles are modified to coat a layer of polymer on the surface, and then dispersed in non- In a polar solvent, the titanium dioxide nanoparticles are oriented and self-assembled into a pearl chain structure by applying an external DC electric field. The present invention modifies the surface of titanium dioxide nanoparticles and utilizes a DC external electric field lower than 6000V / cm to control the self-assembly of colloidal particles into a pearl chain structure, which can significantly reduce the electric field intensity, ensure a safer voltage, and protect the electrodes; and improve The speed of self-assembly shortens the self-assembly time and ensures high preparation efficiency. The formed pearl chain structure can be widely used in optoelectronic devices and sensors; and self-assembly can be completed in non-polar solvents, broadening the range of nanoparticles and solvents. range of use.

Description

technical field [0001] The invention relates to the preparation of a self-assembled structure, especially a method for controlling the self-assembly of colloidal particles and preparing a patterned structure by applying a direct-current external electric field, that is, self-assembling titanium dioxide colloidal particles by applying a direct-current external electric field to prepare pearl chains structure. Background technique [0002] Nanoparticles have specific surface effects, quantum size effects, small size effects, and macroscopic quantum tunneling effects, so they have extremely important applications in optoelectronic materials, microelectronic devices, biosensors, and catalysts. Utilizing the excellent physical and chemical properties of nanoparticles, one or more nanoparticles are used as structural units, and the agglomeration effect between nanoparticles is fully utilized through self-assembly technology to prepare large-sized, well-ordered 2D arrays or 3D arra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/047
CPCC01G23/047
Inventor 金名亮王丹水玲玲李楠周国富
Owner SOUTH CHINA NORMAL UNIVERSITY
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