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Method for preparing Cu2O-water heat-conductive nanofluids through chemical synthesis

A nanofluid and chemical method, which is applied in the field of chemical synthesis of Cu2O water thermally conductive nanofluids, can solve the problems of lack of effective means, easy aggregation of nanoparticles, unstable products, etc., and achieve high thermal conductivity and dispersion stability. Good, the effect of improving the thermal conductivity

Inactive Publication Date: 2015-08-26
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the interaction between nanoparticles or the defects of the physical method itself, these two methods lack effective means in controlling the microstructure of nanoparticles, and the nanoparticles contained in the synthesized nanofluids have large particle sizes. , so that the nanoparticles are easy to agglomerate in the base liquid, the dispersion is poor, and the product is unstable. Therefore, how to effectively prevent the aggregation or aggregation of nanoparticles and prepare a stable nanofluid is the biggest challenge for practical applications.

Method used

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  • Method for preparing Cu2O-water heat-conductive nanofluids through chemical synthesis
  • Method for preparing Cu2O-water heat-conductive nanofluids through chemical synthesis
  • Method for preparing Cu2O-water heat-conductive nanofluids through chemical synthesis

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Experimental program
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Effect test

Embodiment 1

[0026] A chemically synthesized Cu 2 O water heat conduction nanofluid, the preparation condition is: n(CuSO 4 ·5H 2 O):n(KBH 4 ):n(KOH)=5:2:10.5=2.5:1:5.25, EDTA=0.13mol / L, sodium citrate=0.15mol / L, KOH=0.7mol / L, T=20°C, add dropwise for 40min After the dropwise addition, the reaction was carried out for 80 minutes, and the specific method was as follows:

[0027] Preparation of solution A: In a 500ml three-necked flask, add 0.8823g sodium citrate, 1.2534g CuSO 4 ·5H 2 O, 0.7557g EDTA dissolved in 60ml of distilled water, configured to contain sodium citrate 0.05mol / L, containing CuSO 4 ·5H 2 O 0.083mol / L, containing EDTA0.043mol / L aqueous solution, ultrasonic and stir well.

[0028] Preparation of solution B: 0.5892g KOH, 0.1089g KBH 4 Dissolved in 30ml of distilled water, configured to contain KOH 0.35mol / L, containing KBH 4 0.065mol / L aqueous solution, stirred evenly, and added to the dropping funnel one by one.

Embodiment 2

[0030] A chemically synthesized Cu 2 O water heat conduction nanofluid, the preparation condition is: n(CuSO 4 ·5H 2 O):n(KBH 4 ):n(KOH)=2.08:1:5.7, EDTA=0.13mol / L, sodium citrate=0.15mol / L, KOH=0.8mol / L, T=30°C, add dropwise for 40 minutes and finish the reaction for 80 minutes , the specific method is:

[0031] Preparation of solution A: In a 250ml three-necked flask, add 0.8823g sodium citrate, 1.2530g CuSO 4 ·5H 2 O, 0.7598g EDTA dissolved in 20ml of distilled water, configured to contain sodium citrate 0.15mol / L, containing CuSO 4 ·5H 2 O 0.25mol / L, containing EDTA0.13mol / L aqueous solution, ultrasonic and stir well.

[0032] Preparation of solution B: add 0.6733g KOH and 0.1294g KBH in sequence 4 Dissolved in 15ml of distilled water, configured to contain KOH 0.8mol / L, containing KBH 4 0.16mol / L aqueous solution, stirred evenly, and added to the dropping funnel one by one.

Embodiment 3X

[0033] Embodiment 3 X-ray diffraction analysis

[0034] Carry out X-ray diffraction to the nanoparticle prepared by embodiment 1, measurement result is as follows figure 1 shown.

[0035] Depend on figure 1 It can be seen that the prepared nano-Cu 2 O has five main characteristic peaks, the peak positions are 29.71°, 37.86°, 43.32°, 62.36°, and 73.86°, and the corresponding crystal plane indices are 110, 111, 200, 220, and 311. These diffraction peaks are all related to Cu 2 The standard data of O (JCPDS 5-0667) is consistent, and there are no impurity peaks such as Cu and CuO in the figure, and Cu 2 The content of O is 100%, indicating that the Cu 2 The purity of O is very high, and there are no by-products such as Cu and CuO. According to Scherrer's formula, it can be calculated that the particle size of cuprous oxide is about 4nm.

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Abstract

The invention discloses a method for preparing Cu2O-water heat-conductive nanofluids through chemical synthesis. A certain amount of distilled water, sodium citrate, copper sulfate pentahydrate and EDTA (ethylene diamine tetraacetic acid) are sequentially added, mixed, subjected to ultrasonic treatment and uniformly stirred, and a copper sulfate solution A is obtained; a certain amount of water, potassium hydroxide and potassium borohydride are sequentially added and mixed, and a potassium borohydride solution B is obtained; under the action of ultrasonic treatment, the solution B is dropwise added to the solution A at a certain flow speed at a certain temperature for a reaction while stirred at a high speed, after drop adding is completed, stirring and ultrasonic treatment are continued for a certain time, and the Cu2O-water heat-conductive nanofluids are obtained after the reaction ends. The method is a one-step wet chemical synthesis method for the Cu2O-water heat-conductive nanofluids, the sizes of Cu2O nanofluids synthesized with the method are smaller, and the nanofluids have good dispersion stability and high heat conductivity in water.

Description

technical field [0001] The invention belongs to the technical field of heat transfer or refrigerant, in particular to a chemical synthesis of Cu 2 Preparation method of O water heat conduction nanofluid. Background technique [0002] Nanofluid is to disperse nanoscale metals or nonmetals or their oxides or their mixture nanopowders into traditional heat exchange media such as water, alcohol, oil, etc., to prepare a new heat exchange medium with uniform, stable and high thermal conductivity. It was Choi of the Argonne National Laboratory in the United States who first proposed this concept. Since then, it has attracted widespread attention from researchers at home and abroad, and created a new situation in the application of nanofluids to enhance heat transfer. Especially in the current context of global warming and energy conservation and emission reduction, in recent years, researchers have used nanofluids in direct absorption solar collectors, and have shown excellent per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/10C01G3/02
CPCC09K5/08C01G3/02C09K5/14
Inventor 张飞龙俞树荣李澜赵秋萍范宗良王刚毛丽萍王莉许喜伟
Owner LANZHOU UNIVERSITY OF TECHNOLOGY