High-temperature coefficient and high-stability room temperature switch nanocomposite

A nano-composite material and composite material technology, applied in the field of new intelligent nano-composite functional materials, can solve problems such as undeveloped application research, and achieve the effects of enhancing interface affinity, improving on-off ratio, and improving transmission characteristics

Active Publication Date: 2012-11-07
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the research on the application of other nanomaterials with excellent physical and chemical prope

Method used

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  • High-temperature coefficient and high-stability room temperature switch nanocomposite
  • High-temperature coefficient and high-stability room temperature switch nanocomposite
  • High-temperature coefficient and high-stability room temperature switch nanocomposite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1, using chemical surface modification to disperse carbon nanomaterials in strong polar solvents such as glycerin and deionized water, the steps for preparing such room temperature switching carbon nanocomposites are as follows:

[0033] (1) the volume ratio of configuration vitriol oil and concentrated nitric acid is: the mixed acid of 3 / 1;

[0034] (2) carbon nanoparticles are put into mixed acid to carry out carboxylation reaction, the reaction ratio of mixed acid and carbon nanomaterial is 100ml: 0.1g;

[0035] (3) The reaction methods of the mixed acid and the carbon nanomaterials are: carbon nanotubes, 50W ultrasonic reaction at room temperature for 6h. Carbon black, fullerene, and nano-graphite flakes were refluxed in the mixed acid solution at room temperature for 4 hours. Graphene, reflux in mixed acid solution at room temperature for 2h;

[0036] (4) The reaction product is repeatedly washed by a high-speed centrifuge (10000rpm) until the pH value of...

Embodiment 2

[0038] Example 2, using chemical surface modification to disperse carbon nanomaterials in 20 alkane (36.4°C), 19 alkane (32°C), 18 alkane (28°C), 16 alkane (18.1°C), methyl palmitate (29°C) When waiting for non-polar solvents, the steps for preparing such room temperature switching carbon nanocomposites are as follows:

[0039] (1) the carboxylated carbon nanomaterial and 18 amine are mixed evenly in a ratio of 1: 4 with a mass ratio;

[0040] (2) Place the mixture in a closed container and react at 95°C for 96h;

[0041] (3) after the reaction finishes, wash the reactant with a large amount of ethanol. After repeating 3 to 5 times, filter the reactant with a microporous filter membrane with a pore size of 0.2um to ensure that the redundant 18 amine impurities on the surface of the nanomaterial are washed away, and then the After filtration, the product was placed in a vacuum environment and dried at room temperature for 24 hours;

[0042] (4) Disperse the surface-modified n...

Embodiment 3

[0043] Example 3, using a dispersant (sodium lauryl sulfate) to modify carbon nanomaterials to disperse them in strong polar solvents such as glycerin and deionized water, the steps for preparing such room temperature switching carbon nanocomposites are as follows:

[0044] (1) configuration mass fraction is 1% sodium lauryl sulfate-deionized water mixture base liquid;

[0045] (2) Pour the carbon nanomaterial into the above-mentioned base liquid with a concentration of 50mg / l;

[0046] (3) Use a plug-in ultrasonic device with a power of 500W to perform ultrasonic treatment on the deionized water mixture base liquid mixed with carbon nanomaterials and sodium lauryl sulfate, and the ultrasonic time is based on the formation of a uniform suspension;

[0047] (4) The mixture is filtered using a microporous membrane with a pore size of 0.2um, and repeatedly washed in deionized water by a high-speed centrifuge (10000rpm) to ensure removal of excess sodium lauryl sulfate;

[0048] ...

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Abstract

The invention relates to a method for preparing a high-temperature coefficient and high-stability room temperature switch nanocomposite and the performance of the high-temperature coefficient and high-stability room temperature switch nanocomposite. The high-temperature coefficient and high-stability room temperature switch nanocomposite is a novel intelligent nano composite functional material. According to the method, a nano material with high heat, electric and magnetic transmission characteristics and an insulating base solution with a fixed crystallization point are combined flexibly to prepare the switch nanocomposite; and the interface affinity of the switch nanocomposite and the base solution is enhanced by the surface modification of the nano material, so that the switch ratio and stability of the nanocomposite are improved greatly. The intelligent nano composite functional material with high practicality has a broad application prospect in fields of energy, biological medical treatment and the like.

Description

technical field [0001] The invention belongs to a novel intelligent nanocomposite functional material Background technique [0002] Since Faraday discovered the thermistor effect of silver sulfide, researchers have developed a series of thermistor materials including ceramic matrix and polymer matrix composite materials. Among them, the thermistor material with critical temperature coefficient (CTR) has a "self-locking" function near its phase transition temperature, and exhibits special intelligent characteristics, which has attracted extensive attention from the industry. It is widely used in sensing, temperature control, Current limiting, overload protection and other fields have a wide range of applications. The critical temperature of these thermistor materials is determined by their phase transition (ceramic base) or softening temperature (polymer base). Among the reported materials, VO 2 The phase transition temperature is closest to room temperature, about 340K. ...

Claims

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Application Information

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IPC IPC(8): C09K5/06H01B1/00H01B17/56G01K7/00
Inventor 郑瑞廷孙鹏程程国安
Owner BEIJING NORMAL UNIVERSITY
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