A preparation method of amphiphilic hyperbranched molecular modified nanofluid

An amphiphilic hyperbranched, nanofluid technology, applied in the field of heat transfer, can solve problems such as the difficulty of ensuring the stability of nanofluids and the influence of the heat transfer capacity of nanofluids, and achieve the increase of heat transfer specific surface, prolong life, and step simple effect

Active Publication Date: 2021-05-14
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Traditional nanofluids need to add dispersants or surfactants to improve their stability during the preparation process, but adding dispersants or surfactants will affect the heat transfer capability of nanofluids, and once dispersants or surfactants occur Aging and deterioration, the stability of nanofluids is difficult to be guaranteed

Method used

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  • A preparation method of amphiphilic hyperbranched molecular modified nanofluid
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  • A preparation method of amphiphilic hyperbranched molecular modified nanofluid

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Embodiment 1

[0035] A preparation method of amphiphilic hyperbranched molecule modified nanofluid is as follows:

[0036] (1) Under a nitrogen atmosphere, dissolve 5 g of HPG in 20 mL of dimethyl sulfoxide, add 50 g of methacrylic acid dropwise, and stir vigorously for 5 h. After the reaction, pour it into 400 mL of ether and stir for half an hour to obtain light Yellow to brown viscous liquid sinks to the lower layer, the upper layer ether is discarded, and the intermediate product is obtained by rotary evaporation;

[0037] (2) Dissolve 1 g of the intermediate product obtained in step (1) in chloroform, add 5 times the mass of octadecyl mercaptan and 0.05 g of benzophenone, and react with ultraviolet photocatalysis for 1-3 h to obtain the crude product. Dialyze in 400 mL of chloroform for 2 days, and vacuum-dry to obtain amphiphilic HPG-C18;

[0038] (3) Add 10 mL of toluene and 0.2 g of amphiphilic HPG-C18 to a 50 mL flask, add 0.15 g of silver nitrate, stir magnetically at 25°C until ...

Embodiment 2

[0042] A preparation method of amphiphilic hyperbranched molecule modified nanofluid is as follows:

[0043] (1) Add 10 mL of toluene and 0.2 g of HPG-C18 obtained in Example 1 to a 50 mL flask, add 0.2 g of chloroauric acid, stir magnetically at 25°C until completely dissolved, and add 0.2 g of sodium citrate under a nitrogen atmosphere , reacted for 4 h. The reaction solution was rotary evaporated to remove toluene, dialyzed in chloroform for two days, and dried in vacuum for 24 hours to obtain amphiphilic hyperbranched molecular modified nanoparticles;

[0044] (2) Weigh amphiphilic hyperbranched molecule-modified nanoparticles and add them into decahydronaphthalene for ultrasonic dispersion for 1 h to obtain amphiphilic hyperbranched molecule-modified nanofluids with a nanoparticle content of 0.01%~0.3%. The silver nanofluid can be Stable for more than 1 month, the thermal conductivity at 50 ° C is 5% to 93% higher than that of the base fluid.

Embodiment 3

[0046] A preparation method of amphiphilic hyperbranched molecule modified nanofluid is as follows:

[0047] (1) Add 10 mL of toluene and 0.2 g of HPG-C18 obtained in Example 1 to a 50 mL flask, add 0.2 g of potassium chloropalladate, stir magnetically at 25°C until completely dissolved, and add 0.2 g of boron under a nitrogen atmosphere Sodium hydride, react for 4 h. The reaction solution was rotary evaporated to remove toluene, dialyzed in chloroform for two days, and dried in vacuum for 24 hours to obtain amphiphilic hyperbranched molecular modified nanoparticles;

[0048] (2) Weigh amphiphilic hyperbranched molecule-modified nanoparticles and add them into decahydronaphthalene for ultrasonic dispersion for 1 h to obtain amphiphilic hyperbranched molecule-modified nanofluids with a nanoparticle content of 0.01%~0.5%. The silver nanofluid can be Stable for more than 1 month, the thermal conductivity at 50°C is 10%~180% higher than that of the base fluid

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Abstract

The invention discloses a preparation method of amphiphilic hyperbranched molecule modified nanofluid. The nanofluid is composed of a liquid medium and nanoparticles dispersed in the liquid medium. The main steps of the preparation method include the preparation and dispersion of the nanoparticle. The surface of the nanomaterial is modified by hyperbranched molecules, the nanoparticles are dispersed and stable, and there is no agglomeration phenomenon, and the present invention uses the unique dendritic macromolecular structure of the hyperbranched molecules to load the nanoparticles, and utilizes the amphiphilic nature of the hyperbranched molecules to make the nanoparticles The particles exist in a highly dispersed state and are not easy to aggregate, fall off and inactivate. The prepared nanofluid is not easy to agglomerate and has good stability; the preparation process is controllable, has good repeatability, and is easy to popularize. It can obtain nanofluids with stable dispersion and good thermal conductivity. .

Description

technical field [0001] The invention belongs to the technical field of heat transfer, and relates to a nanofluid heat transfer working medium, in particular to a preparation method of amphiphilic hyperbranched molecular modified nanofluid. Background technique [0002] With the continuous development of the economy and society and the increasingly prominent energy problems, the effective use and conservation of energy has become a problem that is highly valued in the economic development of various countries. Traditional heat transfer fluids have low thermal conductivity and poor heat transfer capacity, making it difficult to meet today's high-intensity and high-load heat transfer requirements. It is urgent to develop new and efficient heat transfer fluids with high thermal conductivity and good heat transfer performance to meet high Heat transfer requirements under load and special conditions. Nanofluid is a new type of heat exchange medium that is uniform, stable and high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/62C09C3/10C09K5/10
CPCC01P2004/64C09C1/62C09C1/627C09C3/10C09K5/10
Inventor 秦笑梅陈亚培王兰秦肖雲赵建波任静怡周宁郑先君
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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