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A kind of nanofluid of frequency dividing liquid and its preparation method and application

A nanofluid and nanoparticle technology, applied in the fields of nanotechnology, nanotechnology, and nanotechnology for materials and surface science, can solve problems such as easy agglomeration, reduction of silicon battery electrical output, and Ag nanofluid precipitation, etc. The effect of temperature rise performance, high final temperature, strong absorption capacity

Active Publication Date: 2021-10-12
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problems of using water-based nanofluid as the crossover fluid in PV / T systems include: on the one hand, limited by the boiling point of water, unless pressurized, the output temperature of the system does not exceed 100°C, which cannot meet the requirements of some commercial and manufacturing industries such as food and beverages. Heat demand for disinfection, plastic manufacturing, etc., and pressurization to make the output temperature exceed 100°C requires additional structural costs; on the other hand, water has a strong absorption peak at 975nm, which is comparable to the high efficiency of silicon cells commonly used in PV / T systems The response bands overlap, so water-based nanofluid frequency division will reduce the electrical output of silicon cells
However, Ag nanoparticles are active and easy to agglomerate in the fluid, which leads to the phenomenon of "precipitation" in Ag nanofluids, which is also a common problem in existing nanofluids.

Method used

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  • A kind of nanofluid of frequency dividing liquid and its preparation method and application
  • A kind of nanofluid of frequency dividing liquid and its preparation method and application
  • A kind of nanofluid of frequency dividing liquid and its preparation method and application

Examples

Experimental program
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Embodiment 1

[0036] S1: Preparation of Ag nanofluids by trisodium citrate reduction method

[0037] Weigh 0.02g of silver nitrate and dissolve it in 2ml of deionized water, add diluted ammonia water dropwise to form a yellow precipitate and then dissolve until clear to obtain a silver ammonia solution; weigh 0.1g of anhydrous glucose, 0.006g of trisodium citrate and 1g of poly Dissolve vinylpyrrolidone (PVP) in 50ml of deionized water, and stir with a glass rod to completely dissolve it to form a mixed solution A; place the mixed solution A on a temperature-controlled magnetic heating stirrer, stir at a low speed and heat to 85°C, and add silver ammonia solution dropwise , the solution changed from colorless to yellow, indicating the formation of Ag nanoparticles. Keep heating at 85°C for 30 minutes. After the heating, adjust the volume of Ag nanofluid to 50ml. The size range of the Ag nanoparticles is 30-53nm, the average diameter is 41nm, and the concentration in the Ag nanofluid is 254p...

Embodiment 2

[0043] S1 is the same as S1 in Example 1, that is, the particle size range of the Ag nanoparticles is 30-53nm, the average diameter is 41nm, and the concentration in the Ag nanofluid is 254ppm.

[0044] S2: Using the improved Preparation of Ag@SiO 2 Nanoparticles:

[0045] Mix 25ml of cooled Ag nanofluid with 100ml of absolute ethanol, that is, the volume ratio of absolute ethanol to Ag nanofluid is 4, to obtain a mixed solution B; after stirring the mixed solution B for 1min, add dropwise 0.5ml of dimethylamine and 0.01 mlTEOS, the concentration of TEOS is 0.35864mM, stirred at room temperature for 12h to obtain Ag@SiO 2 nanofluids. Centrifuged and washed twice with absolute ethanol to obtain Ag@SiO 2 The average diameter of the nanoparticles is 55nm, where SiO 2 Ag@SiO with a shell thickness of 14nm 2 nanoparticles.

[0046] S3 is identical with S3 in embodiment 1, is about 10ml CoSO 4 Aqueous solution (240g / L) was mixed with 60ml propylene glycol, stirred and evapo...

Embodiment 3

[0048] S1 is the same as S1 in Example 1, that is, the particle size range of the Ag nanoparticles is 30-53nm, the average diameter is 41nm, and the concentration in the Ag nanofluid is 254ppm.

[0049] S2: Using the improved Preparation of Ag@SiO 2 Nanoparticles:

[0050] Mix 25ml of cooled Ag nanofluid with 100ml of absolute ethanol, that is, the volume ratio of absolute ethanol to Ag nanofluid is 4, to obtain a mixed solution B; after stirring the mixed solution B for 1min, add dropwise 0.5ml of dimethylamine and 0.01 mlTEOS, the concentration of TEOS is 1.8679mM, stirring at room temperature for 10h to obtain Ag@SiO 2 nanofluids. Wash twice by centrifugation with absolute ethanol to obtain an average diameter of 71 nm, SiO 2 Ag@SiO2 nanoparticles with a shell thickness of 30 nm. Such as figure 1 Ag@SiO of Example 3 2 Scanning electron microscope image of nanoparticles, the dark round core in the figure is Ag nanoparticles, and the light-colored coating layer outsid...

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Abstract

The invention provides a nanofluid of frequency division liquid and its preparation method and application, including propylene glycol-CoSO4 solution and Ag@SiO 2 Nanoparticles; in the nanofluid, the Ag@SiO 2 The mass concentration range of nanoparticles is 0.0051-0.0508g / L; the Ag@SiO 2 Nanoparticles including Ag nanoparticles and SiO 2 shell, the Ag nanoparticles are externally wrapped with SiO 2 Shell. The present invention adopts CoSO 4 and Ag@SiO 2 The synergistic effect of nanoparticles strengthens the absorption of short-wavelength light by the frequency-dividing fluid, making the optical properties of the nanofluid frequency-dividing fluid more compatible with the spectral response curve of photovoltaic cells; replacing water with propylene glycol as the base fluid can improve the optical performance of the nanofluid frequency-dividing fluid. Matching, stability, light-to-heat conversion capability and system outlet output temperature, thereby improving the comprehensive utilization efficiency of the PV / T system.

Description

technical field [0001] The invention relates to the technical field of solar energy frequency-dividing fluid materials, in particular to a nanofluid of frequency-dividing fluid and its preparation method and application. Background technique [0002] Effective use of solar energy is an effective measure to solve energy and environmental crises. A lot of research is devoted to developing an efficient solar energy utilization system. Among these studies, photovoltaic-thermal (PV / T) systems capable of simultaneously supplying electricity and heat have attracted much attention. However, in conventional PV / T systems, thermal energy is always collected by a cooling unit connected to the back of the photovoltaic cell, which causes the temperature of the collected thermal energy to be limited by the temperature of the photovoltaic cell. In recent years, PV / T systems using solar spectrum frequency division technology have been considered as a way to utilize solar energy more effici...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/10H02S40/44B22F9/24B22F1/02B82Y30/00B82Y40/00
CPCC09K5/10H02S40/44B22F9/24B82Y30/00B82Y40/00B22F1/07B22F1/054B22F1/16Y02E10/50Y02E10/60
Inventor 韩新月黄菊赵晓波黄慧敏
Owner JIANGSU UNIV
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