Preparation method and application of nano porous membrane based on heavy ion irradiation

Abstract

The invention discloses a preparation method and application of a nano-porous membrane based on heavy ion irradiation. The preparation method comprises the following steps: treating a polymeric membrane in a manner of heavy ion irradiation and ultraviolet-induced oxidation etching in sequence to obtain the nano-porous membrane; the heavy ion irradiation refers to that 1-5GeV bismuth ions, gold ions or silver ions are adopted, and the irradiation dose is 107-1012cm <-2 > to carry out heavy ion irradiation on the polymeric membrane. According to the method, the evaporation rate of the hydrogel can be remarkably increased, the temperature rise amplitude of the electronic equipment is reduced, stable operation of the electronic equipment is effectively guaranteed, the evaporation rate of the hydrogel can be increased to three times or above, and the temperature of an electronic device in operation is reduced by 24 DEG C. Compared with natural cooling, the heat exchange efficiency can be improved by two times through the nano porous membrane enhanced hydrogel evaporation heat dissipation method.

Description

Technical Field

[0001] The present invention relates to a technology in the field of nanomaterials, specifically a method for preparing a nanoporous membrane based on heavy ion irradiation and its application. Background Art

[0002] Nanoporous membranes can greatly increase the evaporation rate of water and enhance heat dissipation. Combining heavy ion irradiation and ultraviolet light-induced oxidation etching can produce nanoporous membranes with good performance, but such nanoporous membranes are mostly used as nanofiltration membranes to selectively separate ions and are rarely used in the field of nanostructure enhanced heat transfer. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the present invention proposes a method for preparing a nanoporous membrane based on heavy ion irradiation and its application, which can significantly increase the evaporation rate of the hydrogel, reduce the temperature rise of the electronic equipment, and effectively ensure the stable operation of the electronic equipment. The evaporation rate of the hydrogel can be increased by more than 3 times, and the temperature of the running electronic device can be reduced by 24°C. Compared with natural cooling, the method of strengthening the evaporation and heat dissipation of the hydrogel by the nanoporous membrane can increase the heat exchange efficiency by two times.

[0004] The present invention is achieved through the following technical solutions:

[0005] The invention relates to a preparation method of a nanoporous membrane based on heavy ion irradiation, wherein a polymer membrane is treated in sequence by heavy ion irradiation and ultraviolet light induced oxidation etching to obtain the nanoporous membrane.

[0006] The heavy ion irradiation refers to: using 1-5 GeV bismuth ions, gold ions or silver ions, with an irradiation dose of 10 7 ~10 12 cm -2 The polymer film is irradiated with heavy ions.

[0007] The polymer film is a PET film, a polyethylene film or a polypropylene film, and its thickness is less than 20 μm.

[0008] The ultraviolet-induced oxidation etching refers to: irradiating the polymer film treated with heavy ion radiation with ultraviolet light for 3 to 6 hours, the active functional groups in the nanopores will absorb ultraviolet light, causing the polymer chains to undergo photo-oxidative degradation, thereby expanding the pore size, and finally washing away the residual substances in the nanopores with water.

[0009] The ultraviolet light irradiation is specifically: using a wavelength of 365nm and 2mW / cm 2 The ultraviolet light source has a high intensity, and the ultraviolet light irradiates the polymer film for 3 to 6 hours.

[0010] The nanopore diameter of the nanoporous membrane is in the range of 0.5 to 10 nm.

[0011] The present invention relates to the application of the nanoporous membrane for heat dissipation of electronic equipment, specifically: the nanoporous membrane and the hydrogel are sequentially arranged outside the electronic equipment, and the evaporation heat dissipation capacity of the hydrogel is enhanced by accelerating the evaporation rate.

[0012] The hydrogel material adopts polyacrylamide (PAAm), polyvinyl alcohol and hyaluronic acid. Technical Effects

[0013] The present invention uses a polymer material with good flexibility, and after heavy ion irradiation supplemented with ultraviolet light-induced oxidation etching treatment, obtains a nanoporous membrane that can be attached to the hydrogel, thereby enhancing the hydrogel's evaporation and heat dissipation capabilities. Compared with the prior art, the nanoporous membrane prepared by the present invention can significantly increase the evaporation rate of the hydrogel, enhance the heat exchange efficiency, reduce the temperature rise of the electronic equipment, and effectively ensure the stable operation of the electronic equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of nanoporous membrane obtained by heavy ion irradiation;

[0015] Figure 2 This is a diagram of the experimental device for using nanoporous membranes to enhance the evaporation and heat dissipation of hydrogels;

[0016] Figure 3 Data graph showing how nanoporous membranes can reduce the operating temperature of electronic devices. DETAILED DESCRIPTION

[0017] like Figure 1 and Figure 2 As shown, this embodiment relates to a method for preparing a nanoporous membrane based on heavy ion irradiation, wherein a polymer membrane is treated by heavy ion irradiation and ultraviolet light induced oxidation etching in sequence to obtain a nanoporous membrane.

[0018] like Figure 2 As shown, a test device based on the above-mentioned nanoporous membrane involved in this embodiment includes: a nanoporous membrane 1, a hydrogel 2, a water-proof membrane 3, a plastic box 4, a heating sheet 5, a copper electrode terminal 6 and a thermocouple 7, wherein: the nanoporous membrane 1 is attached to the surface of the hydrogel 2 to enhance the evaporative heat dissipation of the hydrogel, the water-proof membrane 3 is arranged between the hydrogel 2 and the plastic box 4 to prevent the electronic device from short-circuiting due to contact with water, the heating sheet 5 and the copper electrode terminal 6 constitute an electric heater, the electric heater is located in the plastic box 4, and the thermocouple 7 measures the outermost temperature of the experimental device in real time.

[0019] After specific actual experiments, 1.4 GeV and irradiation dose of 7×10 10 cm -2 The 20 μm thick PET film was irradiated with bismuth ions and then irradiated with 365 nm wavelength and 2 mW / cm2 The nanoporous membrane was obtained by 4 hours of ultraviolet light-induced oxidation etching. Under the specific environment of normal temperature, pressure and relative humidity of 45%, the experimental data obtained are: the nanoporous membrane can increase the evaporation rate of PAAm hydrogel by more than 3 times and reduce the temperature of the running electronic device by 24°C. Figure 3 Compared with natural cooling, the method of enhancing the evaporative heat dissipation of hydrogels using nanoporous membranes can increase the heat transfer efficiency by two times.

[0020] Compared with the prior art, the present invention uses polymers and, after high-energy heavy ion irradiation, can obtain a nanoporous membrane with good performance. The heavy ions will not be deposited inside the membrane to affect the material properties, and can adhere well to the hydrogel and significantly increase the evaporation rate of the hydrogel, thereby enhancing the heat exchange efficiency, effectively reducing the operating temperature of electronic equipment, and ensuring stable operation.

[0021] The above-mentioned specific implementation can be partially adjusted in different ways by those skilled in the art without departing from the principle and purpose of the present invention. The protection scope of the present invention shall be based on the claims and shall not be limited by the above-mentioned specific implementation. Each implementation scheme within its scope shall be subject to the constraints of the present invention.

Claims

1. A method for preparing a nanoporous membrane based on heavy ion irradiation, characterized in that: The polymer film is treated by heavy ion irradiation and ultraviolet light induced oxidation etching in sequence to obtain a nanoporous film; The polymer film is a PET film, a polyethylene film or a polypropylene film, and its thickness is 20 μm or less.

2. The method for preparing a nanoporous membrane based on heavy ion irradiation according to claim 1, characterized in that: The heavy ion irradiation refers to: using 1-5 GeV bismuth ions, gold ions or silver ions, with an irradiation dose of 10 7 ~10 12 cm -2 The polymer film is irradiated with heavy ions.

3. The method for preparing a nanoporous membrane based on heavy ion irradiation according to claim 1, characterized in that: The ultraviolet-induced oxidation etching refers to: irradiating the polymer film treated with heavy ion radiation with ultraviolet light for 3 to 6 hours, the active functional groups in the nanopores will absorb ultraviolet light, causing the polymer chains to undergo photo-oxidative degradation, thereby expanding the pore size, and finally washing away the residual substances in the nanopores with water.

4. The method for preparing a nanoporous membrane based on heavy ion irradiation according to claim 1 or 3, characterized in that: The ultraviolet light irradiation is specifically: using a wavelength of 365nm and 2mW / cm 2 The ultraviolet light source has a high intensity, and the ultraviolet light irradiates the polymer film for 3 to 6 hours.

5. An application of a nanoporous membrane prepared by the method according to any one of claims 1 to 4, characterized in that: Used for heat dissipation of electronic equipment, specifically: nanoporous membrane and hydrogel are sequentially arranged outside the electronic equipment, and the evaporation heat dissipation capacity of the hydrogel is enhanced by accelerating the evaporation rate.

6. The reference according to claim 5, characterized in that: The hydrogel material is polyacrylamide (PAAm), polyvinyl alcohol or hyaluronic acid.

7. The reference according to claim 5, characterized in that: The nanopore diameter of the nanoporous membrane is in the range of 0.5 to 10 nm.

Images