Preparation method of boiling-enhanced water-based solution

Abstract

The invention discloses a preparation method of a boiling-enhanced water-based solution, and relates to the field of water-based solutions, and the preparation method comprises the following steps: S1, preparing a basic solution: degassing deionized water under the protection of inert gas nitrogen or argon, then adding nano composite oxide particles, an ionic liquid corrosion inhibitor and an ampholytic surfactant, and stirring to form a homogeneous dispersion liquid, s2, gradient boiling strengthening: transferring the dispersion liquid prepared in the step S1 to a high-pressure reaction kettle, and carrying out three-gradient boiling strengthening, S3, dynamic cooling and microfiltration, S3, dynamic cooling and microfiltration, and S5, performance acquisition and verification. Through de-ionized water degassing treatment, nano-composite oxide particle addition, thermal physical performance improvement, corrosion resistance and uniform dispersion, through a gradient boiling strengthening stage, the heating rate and the pressure range are strictly controlled, pulse type pressure fluctuation is applied, cooling is performed at a specific rate during dynamic cooling, and the thermal physical performance is improved. The dispersion liquid achieves the effects of optimizing the solution microstructure and strengthening the boiling effect.

Description

Technical Field

[0001] The present invention relates to the field of aqueous solutions, and particularly to a preparation method of a boiling-enhanced aqueous solution. Background Art

[0002] In many fields such as industrial production and the operation of electronic devices, efficient thermal management is crucial. For example, in high-temperature industrial heat exchangers, heat transfer media are required to have good heat transfer performance to improve energy utilization efficiency; in the thermal management system of flow batteries, the cooling medium is required to be compatible with the electrolyte and have stable conductivity to ensure battery performance; in the liquid cooling device of data centers, strict requirements are imposed on the thermal resistance of the heat dissipation medium to ensure the stable operation of the equipment.

[0003] In the current related fields, traditional aqueous solutions have exposed various deficiencies in thermal management applications. In terms of thermal performance, ordinary additives are difficult to significantly improve thermal conductivity and thermal stability, and problems such as reduced heat transfer efficiency and unstable structure are likely to occur at high temperatures, resulting in energy waste and potential hazards in equipment operation; the anti-corrosion and anti-scaling capabilities are limited, and traditional corrosion inhibitors and surfactants cannot effectively cope with equipment corrosion and scaling, which not only shortens the equipment life and increases maintenance costs, but also significantly reduces the heat transfer efficiency due to corrosion products and scaling, leading to increased energy consumption; in terms of function, the solution has a single function and poor compatibility, and cannot meet diverse application requirements. In scenarios such as flow batteries and data centers, performance will be affected due to compatibility issues, and high thermal resistance cannot ensure the stable operation of the equipment; during preparation, insufficient stirring and filtration result in uneven dispersion of additives and residual impurities, and the lack of regulation of key parameters cannot achieve the optimal synergy of performance. Therefore, a preparation method of a boiling-enhanced aqueous solution needs to be designed to solve the above-mentioned problems. Summary of the Invention

[0004] The purpose of the present invention is to solve the disadvantages of low thermal conductivity and thermal stability efficiency, limited anti-corrosion and anti-scaling capabilities, and single solution function in the prior art, and to propose a preparation method of a boiling-enhanced aqueous solution to solve the problems in the above technical solutions.

[0005] To achieve the above purpose, the present invention is realized through the following technical solutions: A preparation method of a boiling-enhanced aqueous solution, including the following preparation steps: S1. Preparation of the basic solution: Heat deionized water to 40 - 50 °C and degas it for 20 - 30 minutes under the protection of an inert gas, nitrogen or argon; then sequentially add 0.5 - 5 wt% of nano-composite oxide particles Al2O3 core, 0.1 - 3 wt% of ionic liquid type corrosion inhibitor, and 0.05 - 1 wt% of amphoteric surfactant, and then mechanically stir at 500 - 1000 rpm for 30 - 60 minutes to form a homogeneous dispersion; S2. Gradient boiling enhancement: Transfer the dispersion prepared in step S1 to a high-pressure reactor, seal it, and introduce nitrogen until the initial pressure reaches 0.1 MPa. In the first stage, heat it at a rate of 2 - 5 °C / min to 80 - 100 °C, maintain the pressure at 0.2 - 0.5 MPa, keep it warm for 10 - 30 minutes, and stir magnetically at 200 - 400 rpm simultaneously. In the second stage, continue to heat it at a rate of 1 - 3 °C / min to 120 - 150 °C, raise the pressure to 0.8 - 1.2 MPa, and apply pulsed pressure fluctuations with a fluctuation amplitude of ±0.1 - 0.3 MPa and a frequency of 2 - 5 times / minute, and keep it warm for 20 - 50 minutes. S3. Dynamic cooling and microfiltration: For the dispersion with gradient boiling enhancement in step S2, use an external circulation cooling system with ethylene glycol - aqueous solution as the cooling medium, and cool it at a rate of 5 - 10 °C / min to 25 - 40 °C. Adopt three - stage series filtration. The first stage: a polypropylene filter membrane with a pore size of 1 μm to remove particles ≥1 μm. The second stage: a polyethersulfone filter membrane with a pore size of 0.2 μm to retain undispersed nano - aggregates. The third stage: a polyvinylidene fluoride filter membrane with a pore size of 0.05 μm to ensure that the residual particle concentration ≤50 ppm, and perform dynamic cooling and microfiltration. S3. Dynamic cooling and microfiltration: Add 0.01 - 0.1 wt% polyethylene glycol or 0.05 - 0.5 wt% sodium carboxymethylcellulose as a stabilizer to the dispersion with dynamic cooling and microfiltration in step S3. Real - time monitor through an on - line pH sensor, and dropwise add citric acid or sodium hydroxide solution to adjust the pH to 6.5 - 8.0. Place the solution in an ultrasonic reactor for 10 - 30 min to ensure dispersion homogeneity and perform functional coordination to regulate the stability of the dispersion. S5. Performance acquisition and verification: Let the dispersion with functional coordination regulation in step S4 stand in an 80 °C incubator for 120 h. After visually observing no stratification, centrifuge it at 3000 rpm / s for 10 min to make the precipitation amount ≤0.1 wt%. Then use the transient plane heat source method to make the thermal conductivity ≥0.75 W / m・K. Secondly, immerse a copper sheet with a purity of 99.9% into the solution for 72 h, and the corrosion rate ≤0.01 mm / y.

[0006] Furthermore, in the step S1, the core - shell Al2O3 core structure of the nano - composite oxide particles is prepared through the following steps: First, dissolve aluminum nitrate in an ethanol - water mixed solvent. According to a volume ratio of 1:1, add ammonia water to adjust the pH to 9 - 10, and then react in a hydrothermal condition at 80 °C for 6 h and then wash by centrifugation. Then disperse the Al2O3 particles in ethanol, add tetraethyl orthosilicate and ammonia water, and stir at 50 °C for 12 h to make the SiO2 / Al2O3 molar ratio reach 0.5 - 2:1. Finally, verify the integrity of the shell layer through a transmission electron microscope to make the shell layer thickness deviation ≤±5%.

[0007] Further, in the step S2, a solenoid valve is used to control the intake and exhaust of nitrogen, with a fluctuation period of 10 - 30 seconds and a pressure peak-to-valley difference of 0.2 - 0.5 MPa. Meanwhile, the change in the solution conductivity is synchronously recorded during the fluctuation process to ensure the surface charge stability of the nanoparticles, with the absolute value of the Zeta potential ≥ 30 mV.

[0008] Further, in the step S2, three-stage series filtration is adopted, and each stage of the filter membrane is equipped with a pressure sensor with a range of 0 - 1 MPa, and the filtration pressure difference is controlled at 0.05 - 0.2 MPa to avoid filter membrane blockage or rupture.

[0009] Further, in the step S4, the ultrasonic treatment adopts an intermittent operation mode, stopping for 1 minute after working for 2 minutes to avoid solution denaturation caused by local overheating.

[0010] Further, in the step S4, the following functional extender is added to the aqueous solution: 0.5 - 2 wt% of carbon quantum dots, prepared by the citric acid pyrolysis method, with a size of 2 - 8 nm and a photothermal conversion efficiency ≥ 40%; 1 - 3 wt% of Ag zeolite nanoparticles, with a 13X-type zeolite carrier and a silver loading of 5 - 15 wt%, and an antibacterial rate ≥ 99.9%.

[0011] Further, in the steps S1 - S5, the nanoparticles are recovered by electrochemically deposition method, with a voltage of 3 - 5 V and a current density of 10 - 50 mA / cm², and the recovery rate ≥ 90%; the ionic liquid is recovered by vacuum distillation, with a pressure of 10 - 50 kPa and a temperature of 80 - 100 °C for separation, and the purity ≥ 95%.

[0012] Further, in the steps S1 - S5, in the high-temperature industrial heat exchanger under the conditions of 150 °C and a flow rate of 2 - 5 m / s, the fouling rate is reduced by more than 50%; for the liquid flow battery thermal management system, which is compatible with vanadium electrolyte, the change rate of conductivity ≤ 5% after 100 cycles; for the data center liquid cooling device, during single-phase immersion cooling, the thermal resistance ≤ 0.01 °C・cm² / W.

[0013] In summary, the present invention provides a preparation method of a water-based solution with enhanced boiling, having the following beneficial effects: 1. By degassing the deionized water, adding nano-composite oxide particles to improve the thermophysical properties, adding an ionic liquid type corrosion inhibitor to prevent equipment corrosion, adding an amphoteric surfactant to promote uniform dispersion, and fully stirring during the preparation of the basic solution, the components of the solution are made stable and uniformly dispersed, having a good initial performance basis, which provides a guarantee for the subsequent process and the final solution performance.

[0014] 2. By strictly controlling the heating rate and pressure range in the two stages during the gradient boiling enhancement stage, applying pulsed pressure fluctuations, and combining with magnetic stirring, and cooling at a specific rate during dynamic cooling, the microstructure of the solution is optimized, the boiling effect is enhanced, and the heat transfer performance is improved, enabling the solution to function more efficiently in heat exchange applications.

[0015] 3. By adding carbon quantum dots to endow photothermal conversion function and Ag zeolite nanoparticles to achieve high-efficiency antibacterial, adding stabilizers, adjusting the pH value and ultrasonic treatment in the functional synergistic regulation, and using electrochemical deposition to recover nanoparticles and vacuum distillation to recover ionic liquids in the waste liquid resource utilization, the functions of the solution are expanded, the performance of the solution is optimized, resource recycling is realized, costs are reduced, and environmental pollution is reduced, enhancing the comprehensive value and applicability of the solution. Brief Description of the Drawings

[0016] Figure 1 It is a schematic flow chart of the preparation method of a water-based solution with enhanced boiling of the present invention. Detailed Embodiments

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] Embodiment: Please refer to Figure 1 As shown, the present invention provides a technical solution: a preparation method of a water-based solution with enhanced boiling, including the following preparation steps: S1. Preparation of the basic solution: Heat deionized water to 40 - 50 °C and degas it for 20 - 30 minutes under the protection of inert gas nitrogen or argon; then sequentially add 0.5 - 5 wt% of nano-composite oxide particles Al2O3 core, 0.1 - 3 wt% of ionic liquid type corrosion inhibitor, and 0.05 - 1 wt% of amphoteric surfactant. Secondly, mechanically stir at 500 - 1000 rpm for 30 - 60 minutes to form a homogeneous dispersion. By degassing treatment, the interference of gas in water on additives is reduced, ensuring the stable performance of additives. At the same time, the added nano-composite oxide particles can improve the thermophysical properties of the solution and enhance the heat transfer effect; the ionic liquid type corrosion inhibitor effectively prevents equipment corrosion and extends the service life of the equipment; the amphoteric surfactant improves the surface activity of the solution, promotes the uniform dispersion of each component, and enhances the overall performance; S2. Gradient boiling enhancement: Transfer the dispersion prepared in step S1 to a high-pressure reactor, seal it, and introduce nitrogen until the initial pressure reaches 0.1 MPa. In the first stage, heat it at a rate of 2 - 5 °C / min to 80 - 100 °C, maintain the pressure at 0.2 - 0.5 MPa, and keep it warm for 10 - 30 minutes while stirring magnetically at 200 - 400 rpm. In the second stage, continue to heat it at a rate of 1 - 3 °C / min to 120 - 150 °C, raise the pressure to 0.8 - 1.2 MPa, and apply pulsed pressure fluctuations with a fluctuation amplitude of ±0.1 - 0.3 MPa and a frequency of 2 - 5 times per minute, and keep it warm for 20 - 50 minutes. Through gradient heating and pressure control, physical changes occur in the solution at different stages, enhancing the intermolecular interaction. The pulsed pressure fluctuations further strengthen the boiling effect, promote the optimization of the solution microstructure, improve the heat transfer performance of the solution, and can carry away heat more efficiently in applications, enhancing the heat exchange efficiency; S3. Dynamic cooling and microfiltration: Cool the dispersion with gradient boiling enhancement in step S2 through an external circulation cooling system with ethylene glycol - aqueous solution as the cooling medium, and cool it at a rate of 5 - 10 °C / min to 25 - 40 °C. Adopt three-stage series filtration. The first stage: a polypropylene filter membrane with a pore size of 1 μm to remove particles ≥1 μm. The second stage: a polyethersulfone filter membrane with a pore size of 0.2 μm to retain undispersed nanoaggregates. The third stage: a polyvinylidene fluoride filter membrane with a pore size of 0.05 μm to ensure that the residual particle concentration ≤50 ppm. Conduct dynamic cooling and microfiltration. Dynamic cooling can rapidly reduce the solution temperature and avoid performance changes caused by the solution staying at a high temperature for a long time. Three-stage series filtration can gradually remove impurities and aggregates in the solution, ensure the purity and uniformity of the solution, improve the stability and reliability of the solution, and enable it to exhibit more stable performance in applications; S4. Functional coordination and regulation: Add 0.01 - 0.1 wt% polyethylene glycol or 0.05 - 0.5 wt% sodium carboxymethylcellulose as a stabilizer to the dispersion with dynamic cooling and microfiltration in step S3. Real-time monitor through an on-line pH sensor, and dropwise add citric acid or sodium hydroxide solution to adjust the pH to 6.5 - 8.0. Place the solution in an ultrasonic reactor and process it for 10 - 30 min to ensure dispersion uniformity, and conduct functional coordination and regulation of the stability of the dispersion. Adding a stabilizer enhances the solution stability and prevents nanoparticle aggregation and sedimentation. Adjusting the pH value makes the solution in a suitable acid-base environment and avoids corrosion of the equipment. Ultrasonic treatment further refines the particle dispersion, improves the uniformity of each component of the solution, optimizes the overall performance of the solution, and enhances its adaptability in different application scenarios; S5. Performance acquisition and verification: The dispersion liquid with coordinated functional regulation in step S4 is left standing in an incubator at 80°C for 120 h. After visual inspection shows no stratification, centrifugation is carried out at 3000 rpm / s for 10 min to make the sediment content ≤ 0.1 wt%. Then, the transient plane heat source method is used to make the thermal conductivity ≥ 0.75 W / m・K. Secondly, a copper sheet with a purity of 99.9% is immersed in the solution for 72 h, and the corrosion rate ≤ 0.01 mm / y. Through long-term high-temperature standing and centrifugation tests, the good thermal stability of the solution is verified, ensuring that in a high-temperature application environment, the solution will not undergo stratification, precipitation and other phenomena, can continuously and stably exert its performance, and ensure the long-term stable operation of the equipment. The thermal conductivity efficiency is measured, and the thermal conductivity meets the requirements of high-efficiency heat conduction. It can quickly transfer heat during the heat exchange process, improve the energy utilization efficiency, reduce energy loss, and is applicable to industrial scenarios with high requirements for thermal conductivity performance. The corrosion resistance is tested according to industry standards, and the results show that the corrosion rate of the solution to metal materials is extremely low, which can effectively protect the metal equipment in contact with it, extend the service life of the equipment, and reduce the equipment maintenance cost and replacement frequency.

[0019] In step S1, the core-shell Al2O3 core structure of the nano-composite oxide particles is prepared through the following steps: First, aluminum nitrate is dissolved in an ethanol-water mixed solvent. According to a volume ratio of 1:1, ammonia water is added to adjust the pH to 9-10, and then the reaction is carried out in a hydrothermal condition at 80°C for 6 h, followed by centrifugation and washing. Then, the Al2O3 particles are dispersed in ethanol, tetraethyl orthosilicate and ammonia water are added, and the mixture is stirred at 50°C for 12 h to make the SiO2 / Al2O3 molar ratio reach 0.5-2:1. Finally, the integrity of the shell layer is verified through a transmission electron microscope, and the shell layer thickness deviation ≤ ±5%, which can accurately synthesize Al2O3 cores with uniform particle sizes, provide a good foundation for subsequent coating of the SiO2 shell, ensure the quality and performance stability of the cores, and help improve the performance of the final nano-composite oxide particles. The coating conditions are precisely controlled to make SiO2 uniformly coat on the surface of the Al2O3 core, forming a stable core-shell structure. The complete and uniformly thick shell layer can effectively protect the inner core, enhance the stability of the nano-composite oxide particles in the solution, and improve their dispersibility and functionality.

[0020] In step S2, a solenoid valve is used to control the nitrogen intake and exhaust, with a fluctuation period of 10-30 seconds and a pressure peak-to-valley difference of 0.2-0.5 MPa. At the same time, the change in the solution conductivity is synchronously recorded during the fluctuation process to ensure the surface charge stability of the nano-particles, with the absolute value of the Zeta potential ≥ 30 mV. The pressure fluctuation parameters are precisely controlled to effectively enhance the boiling effect of the solution. Monitoring the conductivity and Zeta potential ensures the stability of the surface charge of the nano-particles, prevents particle agglomeration, and maintains the uniform dispersion state of the solution, thereby ensuring the stable performance of the solution and improving its efficiency in heat transfer and other aspects.

[0021] In step S2, a three-stage series filtration is performed. Each stage of the filter membrane is equipped with a pressure sensor with a range of 0 - 1 MPa. The filtration pressure difference is controlled within 0.05 - 0.2 MPa to avoid filter membrane clogging or rupture. The pressure sensor is used to monitor the filtration pressure difference in real time to ensure the stable progress of the filtration process. Reasonably controlling the pressure difference can effectively avoid filter membrane clogging, extend the service life of the filter membrane, ensure the filtration effect, make the purity of the finally obtained solution meet the requirements, and guarantee the solution quality.

[0022] In step S4, the ultrasonic treatment adopts an intermittent operation mode. It stops for 1 minute after working for 2 minutes to avoid solution denaturation caused by local overheating. The intermittent ultrasonic operation can not only fully exert the dispersion effect of ultrasound but also effectively prevent local overheating, ensure the stable performance of additives and other components in the solution, maintain the original characteristics of the solution, and guarantee the reliability of the solution in subsequent applications.

[0023] In step S4, the following functional extenders are added to the aqueous solution: 0.5 - 2 wt% of carbon quantum dots, prepared by the citric acid pyrolysis method, with a size of 2 - 8 nm and a photothermal conversion efficiency of ≥40%; 1 - 3 wt% of Ag@zeolite nanoparticles, with a 13X - type zeolite carrier and a silver loading of 5 - 15 wt%, and an antibacterial rate of ≥99.9%. Adding carbon quantum dots endows the solution with a photothermal conversion function, which can convert light energy into heat energy, broaden the application field of the solution, such as playing a role in a photothermal utilization system and improving the diversity and efficiency of energy utilization; adding Ag@zeolite nanoparticles enables the solution to have high - efficiency antibacterial ability, and in some application scenarios with high hygiene requirements, such as the cooling of medical equipment and the thermal management of food processing equipment, it can effectively inhibit bacterial growth and ensure the hygiene and safety of equipment and the environment.

[0024] In steps S1 - S5, the nanoparticles are recovered by electro - chemical deposition with a voltage of 3 - 5 V and a current density of 10 - 50 mA / cm², and the recovery rate is ≥90%; the ionic liquid is recovered by vacuum distillation at a pressure of 10 - 50 kPa and a temperature of 80 - 100 °C, and the purity is ≥95%. High - efficiency recovery of nanoparticles by electro - chemical deposition realizes resource recycling, reduces production costs, reduces resource waste, and at the same time reduces the potential pollution of nanoparticles to the environment; recovering the ionic liquid by vacuum distillation obtains a high - purity ionic liquid, which can be put into production again, reduces production costs, and reduces the impact of ionic liquid emissions on the environment, in line with the concepts of green chemistry and sustainable development.

[0025] In steps S1-S5, for the high-temperature industrial heat exchanger, under the conditions of 150 °C and a flow rate of 2-5 m / s, the fouling rate is reduced by more than 50%; for the liquid flow battery thermal management system, which is compatible with vanadium electrolyte, the change rate of conductivity is ≤5%, and it can be cycled 100 times; for the data center liquid cooling device, during single-phase immersion cooling, the thermal resistance is ≤0.01 °C·cm² / W. When applied to the high-temperature industrial heat exchanger, it can significantly reduce the fouling rate, reduce the increase in thermal resistance caused by fouling, improve the heat transfer efficiency, reduce energy consumption, extend the equipment cleaning cycle and service life, and enhance the economic benefits of industrial production; it is applicable to the liquid flow battery thermal management system, is well compatible with vanadium electrolyte, and has stable conductivity. It can effectively remove the heat generated during battery operation, ensure the stable performance of the battery, improve the battery cycle life, and promote the application and development of the liquid flow battery technology; when used in the data center liquid cooling device, it has an extremely low thermal resistance, can dissipate heat efficiently, ensure the operation of the data center equipment in a stable temperature environment, improve the operation stability and reliability of the equipment, and guarantee the normal operation of the data center.

[0026] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention in other forms. Any person skilled in the art may use the technical content disclosed above to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical solution content of the present invention, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A preparation method of a water-based solution with enhanced boiling, characterized in that: It includes the following steps: S1. Basic solution preparation: Heat deionized water to 40 - 50 °C and degas it for 20 - 30 minutes under the protection of inert gas nitrogen or argon; then successively add 0.5 - 5 wt% of nano - composite oxide particles Al2O3 core, 0.1 - 3 wt% of ionic liquid - type corrosion inhibitor, and 0.05 - 1 wt% of amphoteric surfactant. Secondly, mechanically stir at 500 - 1000 rpm for 30 - 60 minutes to form a homogeneous dispersion; S2. Gradient boiling enhancement: Transfer the dispersion prepared in step S1 to a high - pressure reactor, seal it, and introduce nitrogen until the initial pressure is 0.1 MPa; In the first stage, heat it to 80 - 100 °C at a rate of 2 - 5 °C / min, maintain the pressure at 0.2 - 0.5 MPa, and keep it warm for 10 - 30 minutes while magnetically stirring at 200 - 400 rpm; In the second stage, continue to heat it to 120 - 150 °C at a rate of 1 - 3 °C / min, raise the pressure to 0.8 - 1.2 MPa, and apply pulsed pressure fluctuations with a fluctuation amplitude of ±0.1 - 0.3 MPa and a frequency of 2 - 5 times / minute, and keep it warm for 20 - 50 minutes; S3. Dynamic cooling and microfiltration: Cool the dispersion with gradient boiling enhancement in step S2 through an external circulation cooling system with ethylene glycol - aqueous solution as the cooling medium, and cool it to 25 - 40 °C at a rate of 5 - 10 °C / min; Adopt three - stage series filtration. The first stage: a polypropylene filter membrane with a pore size of 1 μm to remove particles ≥1 μm; The second stage: a polyethersulfone filter membrane with a pore size of 0.2 μm to retain undispersed nano - aggregates; The third stage: a polyvinylidene fluoride filter membrane with a pore size of 0.05 μm to ensure that the residual particle concentration ≤50 ppm, and perform dynamic cooling and microfiltration; S4. Functional coordination regulation: Add 0.01 - 0.1 wt% of polyethylene glycol or 0.05 - 0.5 wt% of sodium carboxymethylcellulose as a stabilizer to the dispersion with dynamic cooling and microfiltration in step S3; Real - time monitor through an on - line pH sensor, and dropwise add citric acid or sodium hydroxide solution to adjust the pH to 6.5 - 8.0; Place the solution in an ultrasonic reactor and process it for 10 - 30 min to ensure dispersion uniformity and regulate the stability of the dispersion with functional coordination; S5. Performance acquisition and verification: Let the dispersion with functional coordination regulation in step S4 stand in an 80 °C constant - temperature oven for 120 h. After visually observing no stratification, centrifuge it at 3000 rpm / s for 10 min to make the precipitation amount ≤0.1 wt%; Then adopt the transient plane heat source method to make the thermal conductivity ≥0.75 W / m・K; Secondly, immerse a copper sheet with a purity of 99.9% into the solution for 72 h, and the corrosion rate ≤0.01 mm / y.

2. The preparation method of a water-based solution with enhanced boiling according to claim 1, characterized in that: In the step S1, the core-shell Al2O3 core structure of the nano-composite oxide particles is prepared by the following steps: First, dissolve aluminum nitrate in an ethanol-water mixed solvent. According to a volume ratio of 1:1, add ammonia water to adjust the pH to 9-10, and then carry out a reaction in hydrothermal conditions at 80 °C for 6 h, followed by centrifugal washing; then disperse the Al2O3 particles in ethanol, add tetraethyl orthosilicate and ammonia water, and stir at 50 °C for 12 h to make the SiO2 / Al2O3 molar ratio reach 0.5-2:1; finally, verify the integrity of the shell layer through a transmission electron microscope, and make the shell layer thickness deviation ≤ ±5%.

3. The preparation method of a water-based solution with enhanced boiling as claimed in claim 1, characterized in that: In the step S2, a solenoid valve is used to control the nitrogen intake and exhaust, with a fluctuation period of 10-30 seconds and a pressure peak-to-valley difference of 0.2-0.5 MPa; at the same time, the change in the solution conductivity is synchronously recorded during the fluctuation process to ensure the surface charge stability of the nanoparticles, and the absolute value of the Zeta potential ≥ 30 mV.

4. The preparation method of a water-based solution with enhanced boiling according to claim 1, characterized in that: In the step S2, three-stage series filtration is carried out. Each stage of the filter membrane is equipped with a pressure sensor with a range of 0-1 MPa, and the filtration pressure difference is controlled at 0.05-0.2 MPa to avoid filter membrane blockage or rupture.

5. The preparation method of a boiling-strengthened aqueous solution according to claim 1, wherein: In the step S4, the ultrasonic treatment adopts an intermittent operation mode, stopping for 1 minute after working for 2 minutes to avoid solution denaturation caused by local overheating.

6. The preparation method of a water-based solution with enhanced boiling according to claim 1, characterized in that: In the step S4, the following functional extender is added to the aqueous solution: 0.5-2 wt% of carbon quantum dots, prepared by the citric acid pyrolysis method, with a size of 2-8 nm and a photothermal conversion efficiency ≥ 40%; 1-3 wt% of Ag zeolite nanoparticles, with a 13X-type zeolite carrier and a silver loading of 5-15 wt%, and a bacteriostatic rate ≥ 99.9%.

7. The preparation method of a water-based solution with enhanced boiling according to claim 1, characterized in that: In the steps S1-S5, the nano-particle recovery adopts the electrochemically deposition method, with a voltage of 3-5 V and a current density of 10-50 mA / cm², and the recovery rate ≥ 90%; the ionic liquid recovery is carried out by vacuum distillation, with a pressure of 10-50 kPa and a temperature of 80-100 °C for separation, and the purity ≥ 95%.

8. A method for preparing a water-based solution with enhanced boiling as claimed in claim 1, characterized in that: In the steps S1-S5, for the high-temperature industrial heat exchanger, under the conditions of 150 °C and a flow rate of 2-5 m / s, the fouling rate is reduced by more than 50%; for the liquid flow battery thermal management system, it is compatible with the vanadium electrolyte, the change rate of conductivity ≤ 5%, and it can cycle 100 times; for the data center liquid cooling device, during single-phase immersion cooling, the thermal resistance ≤ 0.01 °C·cm² / W.

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