A superhydrophilic inverse opal structure liquid absorption core and its preparation method

Abstract

The present invention discloses a superhydrophilic inverse opal structure liquid absorption core and a preparation method thereof, belonging to the technical field of electronic heat dissipation. The liquid absorption core includes a core body, and the core body is a void network structure made of a heat-conducting material. The void network structure is self-assembled into an opal structure by polystyrene microspheres, and the heat-conducting material is filled between the opal structures and directly attached to the wall surface of the heat sink. Then, the microspheres are removed by the principle of similar compatibility. The liquid absorption core of the present invention has a smaller geometric pore diameter, and at the same time improves the equivalent thermal conductivity, permeability and high hydrophilicity.

Description

Technical Field

[0001] The present invention belongs to the technical field of electronic heat dissipation, and relates to a super-hydrophilic inverse opal structure wick and a preparation method thereof. Background Art

[0002] With the rapid development of electronic devices, the derived electronic products are becoming more and more miniaturized and integrated. Coupled with the unstable heat source situation, the requirements for their heat dissipation devices are getting higher and higher. When the device operates at high power, heat will be generated. A large accumulation of heat will cause the device to operate unstably. At the same time, too high a temperature will also cause electronic components to malfunction and age and deform. Therefore, higher requirements are put forward for the thermal design of electronic devices, and more efficient heat dissipation devices are beginning to be widely demanded. The heat pipe uses the latent heat of phase change to achieve efficient heat transfer, which has important practical significance for enhancing heat transfer. It is widely used in small-volume or rapidly dissipating heat electronic products because of its good temperature uniformity and thermal conductivity. As the main component of the heat pipe, the wick provides a flow channel for the working fluid and promotes liquid reflux to ensure the normal operation of the heat pipe. However, the porosity, permeability, capillary force, etc. of the wick affect the mass transfer performance of the wick, and thus affect the heat transfer effect of the heat pipe.

[0003] Currently, the widely used wick types include sintered cores, wire mesh cores, and grooved cores. The sintered core has a high equivalent thermal conductivity. However, the pores are randomly distributed and of different sizes. The sintered core with high capillary force has defects such as small permeability, which affect liquid reflux. The wire mesh core has a high permeability, but its equivalent thermal conductivity is low. The grooved core has defects such as direction sensitivity and poor anti-gravity performance. For the evaporation section of the heat pipe, there is especially a need for a wick structure with higher equivalent thermal conductivity, higher permeability, and higher hydrophilicity. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a super-hydrophilic inverse opal structure wick, which has a small geometric pore diameter, and at the same time improves the equivalent thermal conductivity, permeability, and high hydrophilicity, and solves the problems existing in the prior art.

[0005] Another object of the present invention is to provide a preparation method of a super-hydrophilic inverse opal structure wick.

[0006] The technical solution adopted by the present invention is a super-hydrophilic inverse opal structure wick, including a core body. The core body is a void network structure made of a heat-conducting material. The void network structure is self-assembled into an opal structure by polystyrene microspheres. The heat-conducting material is filled between the opal structures and directly attached to the wall surface of the heat pipe, and then the microspheres are removed by the principle of similar compatibility.

[0007] Furthermore, the core has a plurality of cavities with regular distribution and controllable size, and there are holes with different sizes from the cavities between adjacent cavities.

[0008] Furthermore, the diameter of the cavity is 1 - 10 μm.

[0009] Furthermore, the heat-conducting material is pure copper, copper alloy, aluminum alloy or stainless steel.

[0010] Furthermore, the stacking layer number of the polystyrene microspheres is (h / d) + 1, where h represents the thickness of the core and d represents the diameter of the microspheres.

[0011] A preparation method of a super-hydrophilic inverse opal structure liquid absorption core includes the following steps:

[0012] S1, perform surface pretreatment on the heat pipe to remove oil stains, oxides and impurities;

[0013] S2, coat the surface of the heat pipe with a polystyrene microsphere suspension;

[0014] S3, place the heat pipe in a constant-temperature atmosphere, heat it to induce evaporation and deposition to form a film, and then sinter it in a vacuum box at 95°C - 105°C for 45 min - 75 min, and the heat pipe cools with the box;

[0015] S4, directly attach the heat-conducting material to the wall surface of the heat pipe by electroplating deposition, electron beam evaporation deposition or sputtering coating, and fill it between the microspheres;

[0016] S5, based on the principle of similar compatibility, remove the polystyrene microspheres on the surface of the heat pipe through an organic solution;

[0017] S6, etch the liquid absorption core with a strong alkali solution to obtain it.

[0018] Furthermore, in the step S2, the preparation of the polystyrene microsphere suspension: polystyrene microspheres with a particle size of 1 - 10 μm are mixed and stirred with ethanol, and the weight-volume ratio of the polystyrene microspheres to ethanol is 0.1% - 2.5%.

[0019] Furthermore, in the step S4, the current density of electroplating is 10 - 30 mA / cm 2 。

[0020] Furthermore, in the step S5, the organic solution is acetone, chloroform, toluene, xylene or tetrahydrofuran.

[0021] Furthermore, in the step S6, the strong alkali solution is a mixed solution of sodium hydroxide solution and sodium persulfate solution, and the molar ratio is 2.5:0.13, and the etching time is 29 - 31 min.

[0022] The beneficial effects of the present invention are as follows:

[0023] The liquid absorption core with an inverse opal structure of the present invention has the characteristics of super hydrophilicity, high equivalent thermal conductivity, and high permeability. The voids can be quantitatively adjusted, overcoming the problem that traditional cores are difficult to balance capillary pressure and permeability, expanding the application of the liquid absorption core in the heat dissipation field of heat pipes, and improving the overall performance of heat pipes.

[0024] The accuracy and consistency of the pore size of the metal liquid absorption core produced by the inverse opal structure of the present invention far exceed those of traditional sintered liquid absorption cores, and the porosity is as high as 71%, making the permeability and critical heat flux density increase by an order of magnitude.

[0025] When manufacturing the present invention, the liquid absorption core can be formed only through the processes of surface pretreatment of the copper bottom plate, coating with a polystyrene microsphere suspension, electroplating copper, dissolving the microspheres with an organic solution, and chemical etching, without separately processing the core body and the copper bottom plate and then performing secondary sintering processing, having the advantages of fewer process steps, high efficiency, good structural consistency, and high stability. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0027] Figure 1 It is a schematic flow chart of the preparation of the core body of the liquid absorption core with an inverse opal structure in the embodiment of the present invention.

[0028] Figure 2 It is a schematic diagram of the structural characterization of the core body of the liquid absorption core with an inverse opal structure in the embodiment of the present invention.

[0029] Figure 3 It is an electron microscope image of the structural characterization of the core body of the liquid absorption core with an inverse opal structure in the embodiment of the present invention at a scale of 50 μm.

[0030] Figure 4 It is an electron microscope image of the structural characterization of the core body of the liquid absorption core with an inverse opal structure in the embodiment of the present invention at a scale of 10 μm.

[0031] Figure 5 It is a schematic diagram of the characterization of the super hydrophilic performance of the liquid absorption core prepared in Embodiment 2 of the present invention.

[0032] Figure 6 It is a schematic diagram of the characterization of the super hydrophilic performance of the liquid absorption core prepared in Embodiment 3 of the present invention.

[0033] Figure 7This is a schematic diagram for characterizing the super-hydrophilic performance of the liquid-absorbing core prepared in Example 4 of the present invention.

[0034] Figure 8 This is an electron microscope image showing the core structure of the liquid-absorbing core obtained in Example 5 of the present invention.

[0035] Figure 9 This is a schematic diagram for characterizing the super-hydrophilic performance of the liquid-absorbing core prepared in Example 6 of the present invention.

[0036] Figure 10 This is an electron microscope image showing the core structure of the liquid-absorbing core obtained in Example 7 of the present invention.

[0037] Figure 11 This is an electron microscope image showing the core structure of the liquid-absorbing core obtained in Comparative Example 1 of the present invention.

[0038] In the figure, 1, cavity; 2, copper base; 3, micropore. DETAILED DESCRIPTION

[0039] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0040] Embodiment 1,

[0041] A super-hydrophilic inverse opal structure liquid wick, such as Figure 1-2 As shown, it includes a core body, which is a void network structure of a thermally conductive material; a certain concentration of polystyrene suspension is coated or dripped on a copper plate, and gravity deposition combined with heating induced evaporation is used. As the liquid continues to evaporate, the microspheres self-assemble into an opal structure; the self-assembly is formed under the combined action of Brownian motion, surface tension and gravity, and the spontaneous movement assembles into a hexagonal closest packing; evaporation deposition forms a film, and the thermally conductive material is directly attached to the wall of the heat spreader by electroplating and filled between the opal structures, and then the polystyrene microspheres are removed with an organic solution, and the organic solution is acetone, chloroform, toluene, xylene or tetrahydrofuran; finally, a continuous, permeable, and cavity-rich copper fully covered void network structure is formed, and the core body's own structure can well take into account the relationship between capillary force and permeability, so the overall heat transfer performance is better.

[0042] The core is filled with working fluid. To ensure the permeability and working fluid flow, the pore size of the inverse opal structure used should not be too large or too small, and the final equivalent thermal conductivity of the structure is higher. The diameter of the polystyrene microspheres is 1-10μm; if the particle size is too small, the flow resistance of the working fluid will be very large; if the particle size is too large, the Brownian motion effect is not obvious, which easily leads to a chaotic structure of the assembly.

[0043] The core body has a plurality of cavities 1 with regular distribution and controllable size. The diameter of the cavity 1 is 1 - 10 μm; there are holes with different sizes from the cavity 1 between two adjacent cavities 1.

[0044] The heat-conducting material is pure copper, copper alloy, aluminum alloy or stainless steel, and is filled between the opal structures by means of electroplating deposition, electron beam evaporation deposition or sputtering coating. The filler has properties such as high thermal conductivity, low cost and easy processing, and does not chemically react with the liquid working medium.

[0045] In some embodiments, copper is fully covered. After copper plating, a copper base 2 is formed. Electroplating deposition of copper can achieve a coating with a thickness of millimeter level. Copper is a commonly used heat-conducting material with a relatively high thermal conductivity and is economical and effective. The full coverage of copper makes the core body a single-component material, so there is no need to perform operations such as composite ratio of materials, thus it is easy to process, and the core body has better homogeneity. When heat is introduced into the system, it is evenly heated and local high temperature is not likely to occur, so that the overall performance and heat-conducting performance are better. In addition, the processing procedures for the combination between the core body and the wall surface are reduced, effectively reducing the contact thermal resistance between the wall surface and the core body, reducing the overall thermal resistance. When the same amount of heat is introduced into the system, the temperature difference between the system and the environment is smaller, that is, the system temperature is lower, further improving the heat transfer efficiency.

[0046] In some embodiments, polystyrene microspheres are stacked on the copper plate for at least 16 layers, aiming to fabricate a core body with a thickness of 150 μm. The stacking layer number of the polystyrene microspheres is (h / d)+1, where h represents the thickness of the core body and d represents the diameter of the microspheres (10 μm). The layer number can be more, but too many layers will cause the template to easily fall off during electroplating.

[0047] Example 2

[0048] A preparation method of a super-hydrophilic inverse opal structure liquid-absorbing core, as Figure 1 shown, includes the following steps:

[0049] S1, pre-treat the surface of the copper plate. First remove the oil stain, then remove the oxide, and then remove the impurities. The copper plate is ultrasonically cleaned with acetone, then ultrasonically cleaned with absolute ethanol, and then cleaned with deionized water. When removing the oxide on the surface of the copper plate, first polish it with ultra-fine sandpaper 10000 to remove the macroscopic copper rust, then soak it in the copper-rust-removing acidic solution for about 30 min, and finally rinse it with deionized water. The pre-treated copper plate is dried using a vacuum drying oven.

[0050] S2. Mix PS microspheres with a particle size of 10 μm and ethanol, and then stir for 1 h using a magnetic stirrer to generate a PS suspension. The weight of PS microspheres / volume of ethanol = 2.5%, which is determined by the interaction among surface tension, gravity, and Brownian motion.

[0051] First, place the copper plate in the evaporation section into a petri dish with a diameter of 150 mm. Under normal pressure, heat the PS suspension to 80 °C using a magnetic stirrer water bath. After stirring and dispersing, measure 200 mL of the PS suspension with a measuring cup and pour it into the petri dish. Coat the surface of the copper plate with the polystyrene microsphere suspension or drip it into the copper plate frame; first form a certain thickness of opal structure to prepare for filling copper-based materials in the voids of this structure to prepare an inverse opal structure later.

[0052] S3. Place the petri dish in an empty beaker, place the copper plate in an atmosphere of 45 °C, and heat to induce evaporation and deposition to form a film. A uniform white PS film is formed on the surface of the copper plate. Sinter the copper plate in a vacuum box at 95 °C for 2 h and cool the copper plate with the box. The role of sintering is, on the one hand, to connect the PS balls and the copper plate well, and on the other hand, to form sintering necks between the PS balls. The higher the temperature and the longer the time, the larger the pore diameter of the sintering neck.

[0053] S4. Electroplate copper on the copper plate of S3;

[0054] Preparation of electroplating solution: Mix 1 L of a mixed solution of 0.6 mol / L copper sulfate pentahydrate and 0.5 mol / L sulfuric acid solution. Among them, copper sulfate pentahydrate is used as the solute, with a molar mass of 250 g / mol, and 0.6×250 = 150 g needs to be added to 1 L of the solution; GR grade pure concentrated sulfuric acid is used as the solute, and 27 mL of concentrated sulfuric acid needs to be added to 1 L of the solution.

[0055] Specifically, first measure 500 mL of deionized water, then measure 27 mL of concentrated sulfuric acid with a molar mass of 0.5 mol / L, add it to the deionized water while stirring, and then weigh 150 g of copper sulfate pentahydrate with a molar mass of 250 g / mol and add it to the sulfuric acid solution while stirring. Finally, add water to make up the volume to 1000 mL.

[0056] Use a three-electrode electrolytic cell to electroplate copper on the copper plate for 15 min. Both the working electrode and the counter electrode use platinum electrode clips. The working electrode clip is a sample wrapped with PVC, connected to the negative pole of the DC power supply, as the cathode; the counter electrode clip is a pure copper plate, connected to the positive pole of the DC power supply, as the anode.

[0057] For the copper-based material electroplated in this example, it is not required that it itself is a porous structure, and the components of the electroplating solution used are not specific. For example, when the overcurrent density is too large, additional pores will appear between the inverse opal structures. The current density in the example is 30 mA / cm 2 .

[0058] S5. Immerse the electroplated copper plate in acetone solution for 24 h. Remove the PS microspheres on the copper plate surface according to the "like dissolves like" principle. After taking it out, ultrasonically clean it with absolute ethanol for 10 min, then rinse the copper plate with deionized water, and place the rinsed copper plate in a vacuum for drying.

[0059] S6. Mix 2.5 M sodium hydroxide solution and 0.13 M sodium persulfate solution. After the reaction is complete, put the copper plate in, etch for 30 min and then take it out and air-dry to obtain a liquid-absorbing core with an inverse opal structure. As Figure 3-4 shown, the diameter of cavity 1 is 10 μm, and the minimum width of the holes between two adjacent cavities 1 is 3.14 μm.

[0060] The liquid-absorbing core with an inverse opal structure prepared in the example has a superhydrophilic surface with a contact angle of 8.3°, which is more conducive to liquid reflux. As Figure 5 shown; the porosity of the prepared liquid-absorbing core with an inverse opal structure is 71%.

[0061] S6 performs surface modification by etching with an alkaline solution to generate a surface structure called "nano-grass", further strengthening wetting to increase hydrophilicity. The liquid-absorbing core has characteristics such as high equivalent thermal conductivity, high permeability, small geometric pore size, and superhydrophilic properties. On the one hand, copper hydroxide is formed on the copper surface and then copper oxide is formed. On the other hand, the nano-grass structure is formed to increase roughness and improve wettability.

[0062] Example 3

[0063] A preparation method of a superhydrophilic inverse opal structure liquid-absorbing core, which is different from Example 2 in that:

[0064] S2. Mix PS microspheres with a particle size of 10 μm and ethanol, and then stir with a magnetic stirrer to generate a PS suspension, where the weight of PS microspheres / volume of ethanol = 0.1%;

[0065] S3. After heating-induced evaporation deposition to form a film, sinter in a vacuum box at 100 °C for 75 min, and the heat pipe evaporator cools with the box;

[0066] S4. Electroplate copper on the copper plate in S3, and the current density is 10 mA / cm 2 ;

[0067] S6. Mix 2.5 M potassium hydroxide solution and 0.13 M potassium persulfate solution. After the reaction is complete, put the copper plate in, etch for 31 min and then take it out and air-dry to obtain it. The remaining steps are the same as those in Example 2. The contact angle of the prepared liquid-absorbing core is 13.2°, as Figure 6 shown; the porosity is 67%.

[0068] Example 4

[0069] A method for preparing a superhydrophilic inverse opal structure liquid absorption core, which is different from Example 2 in that:

[0070] S2. Mix PS microspheres with a particle size of 10 μm and ethanol, and then stir using a magnetic stirrer to generate a PS suspension, where the weight of PS microspheres / volume of ethanol = 1%;

[0071] S3. After heating-induced evaporation deposition to form a film, sinter in a vacuum box at 105 °C for 45 min, and the heat pipe is cooled with the box;

[0072] S4. Electroplate copper on the copper plate in S3, with a current density of 20 mA / cm 2 ;

[0073] S6. Mix 2.5 M potassium hydroxide solution and 0.13 M potassium persulfate solution. After the reaction is complete, put in the copper plate, etch for 29 min and then take out and air-dry to obtain. The remaining steps are the same as in Example 2. The contact angle of the prepared liquid absorption core is 21.8°, as shown in Figure 7 ; the porosity is 65%.

[0074] Example 5

[0075] A method for preparing a superhydrophilic inverse opal structure liquid absorption core, which is different from Example 2 in that in S2, PS microspheres with a particle size of 1 μm are mixed with ethanol, and the remaining steps are the same as in Example 2. The contact angle of the prepared liquid absorption core, as shown in Figure 8 ; is 8.1°, and the porosity is 62%.

[0076] Example 6

[0077] A method for preparing a superhydrophilic inverse opal structure liquid absorption core, which is different from Example 2 in that in S4, aluminum alloy is directly attached to the wall of the heat pipe by electron beam evaporation deposition and filled between the microspheres; the remaining steps are the same as in Example 2. The contact angle of the prepared liquid absorption core is 24.0°, as shown in Figure 9 ; the porosity is 58%.

[0078] Example 7

[0079] A method for preparing a superhydrophilic inverse opal structure liquid absorption core, which is different from Example 2 in that in S4, copper alloy is directly attached to the wall of the heat pipe by sputtering coating and filled between the microspheres; the remaining steps are the same as in Example 2. The contact angle of the prepared liquid absorption core, as shown in Figure 10 ; is 30.2°, and the porosity is 65%. The PS microspheres are not completely dissolved, and there is a large amount of carbon element on the surface.

[0080] Comparative Example 1

[0081] A preparation method of a superhydrophilic inverse opal structure liquid absorption core, which is different from Example 2 in that: in S4, the current density used in the copper electroplating operation is 100 mA / cm 2 ; the remaining steps are the same as those in Example 2. The prepared liquid absorption core, as Figure 11 shown, when the current density is too high, micropores 3 will appear at the copper base 2, and these micropores 3 are not conducive to the formation of regular large pores.

[0082] The reason why the heat pipe has a high heat dissipation efficiency mainly comes from the continuous internal working fluid circulation. The driving force for the working fluid circulation is the capillary pressure of the internal liquid absorption core. The working fluid absorbs heat and evaporates on the evaporation surface side, releases heat and condenses on the condensation surface side, and the condensed liquid flows back to the evaporation surface through the action of the liquid absorption core. Since the inverse opal structure involved in the embodiments of the present invention has excellent superhydrophilic properties, when used as the liquid absorption core body on the evaporation surface side of the heat pipe, it can make the coolant on the condensation surface better flow back to the evaporation surface, thereby promoting the occurrence of internal circulation and enabling the heat exchange to continue to achieve the effects of cooling components and reducing the heat flux density.

[0083] The microstructures of the commonly used porous media are all irregular (disordered) at present, with random porous distributions, no clearly defined pore units, which increases the difficulty of accurately predicting the working fluid transport and precisely adjusting the structural characteristics. Moreover, the pores between adjacent pores are highly curved, with a large tortuosity, low permeability, high pressure drop, and low capillary limit, resulting in a significant increase in the working fluid flow resistance. The core body obtained in the embodiments of the present invention has a double-aperture structure, where the large pore diameter is the diameter of the polystyrene microspheres, and the small pores are sintering necks (i.e., the pores between two adjacent cavities 1); the voids of the core body can be quantitatively adjusted. The size of the cavities 1 can be adjusted by adjusting the size of the microspheres, and the gap between adjacent cavities can be adjusted by adjusting the sintering time, that is, the pore diameters of the aforementioned large pores and small pores can be adjusted by different means respectively; quantitative control can form a regular porous structure, and the accuracy and consistency of the core body pore diameter size far exceed those of the traditional sintered liquid absorption core, increasing the permeability and critical heat flux density by an order of magnitude, overcoming the problem that the traditional core body is difficult to balance capillary pressure and permeability, so the overall performance is better. The embodiments of the present invention finally obtain a liquid absorption core with an ordered and superhydrophilic structure, realizing the requirements of high thermal conductivity, high permeability, high wettability, and high capillarity of the core body in the heat pipe. The traditional liquid absorption core cannot be processed simultaneously over a large area, while the structure in the embodiments of the present invention can be processed simultaneously to obtain a large number of metal plate structures with core bodies, which can be directly cut according to actual size requirements, overcoming the technical difficulties of unable to process simultaneously over a large area and low production efficiency in actual industry.

[0084] The above are only the preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention are all included in the protection scope of the present invention.

Claims

1. A preparation method of a superhydrophilic inverse opal structure liquid absorption core, characterized in that It includes the following steps: S1. Perform surface pretreatment on the heat pipe to remove oil stains, oxides and impurities; S2. Coat the surface of the heat pipe with a polystyrene microsphere suspension; S3. Place the heat pipe in a constant-temperature atmosphere, heat it to induce evaporation and deposition to form a film, and then sinter it in a vacuum box at 95°C - 105°C for 45 min - 75 min, and the heat pipe cools with the box; S4. Directly attach a heat-conducting material to the wall surface of the heat pipe by electroplating deposition, electron beam evaporation deposition or sputtering coating, and fill it between the microspheres; S5. Based on the principle of like dissolves like, remove the polystyrene microspheres on the surface of the heat pipe through an organic solution; S6. Etch the wick with a strong alkali solution to obtain it; In the step S2, the preparation of the polystyrene microsphere suspension: polystyrene microspheres with a particle size of 1 - 10 μm are mixed and stirred with ethanol, and the weight-volume ratio of polystyrene microspheres to ethanol is 0.1% - 2.5%; first, put the copper plate of the evaporation section into a petri dish with a diameter of 150 mm, and use a magnetic stirring water bath to heat the PS suspension to 80°C under normal pressure. After stirring and dispersing, measure 200 mL of the PS suspension with a measuring cup and pour it into the petri dish, coat the surface of the copper plate with the polystyrene microsphere suspension, or drip it into the copper plate frame; In the S3, use gravity deposition combined with heating-induced evaporation. As the liquid continuously evaporates, the microspheres self-assemble into an opal structure; the self-assembly is formed under the combined action of Brownian motion, surface tension and gravity, and spontaneously moves to assemble into a hexagonal closest packing; In the step S4, the current density of electroplating is 10 - 30 mA / cm 2 ; In the step S6, the strong alkali solution is a mixed solution of sodium hydroxide solution and sodium persulfate solution, with a molar ratio of 2.5:0.13, and the etching time is 29 - 31 min.

2. The preparation method of a superhydrophilic inverse opal structure liquid absorption core according to claim 1, characterized in that In the step S5, the organic solution is acetone, chloroform, toluene, xylene or tetrahydrofuran.

3. The preparation method of a superhydrophilic inverse opal structure liquid absorption core according to claim 1, characterized in that The wick includes a core body, and the core body has a plurality of cavities (1) that are interconnected, regularly distributed and controllable in size. There are holes with different sizes from the cavities (1) between two adjacent cavities (1).

4. The preparation method of a superhydrophilic inverse opal structure liquid absorption core according to claim 3, wherein, The diameter of the cavity (1) is 1 - 10 μm.

5. The preparation method of a superhydrophilic inverse opal structure liquid absorption core according to claim 1, characterized in that, The heat-conducting material is pure copper, copper alloy, aluminum alloy or stainless steel.

6. The preparation method of a superhydrophilic inverse opal structure liquid absorption core according to claim 1, characterized in that, The stacking layer number of the polystyrene microspheres is , where h represents the core thickness and d represents the microsphere diameter.

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