CN112615560A - Energy acquisition device for solid-liquid evaporation friction, preparation method and energy acquisition method - Google Patents
Energy acquisition device for solid-liquid evaporation friction, preparation method and energy acquisition method Download PDFInfo
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Abstract
The invention provides an energy acquisition device for solid-liquid evaporation friction and a preparation method thereof, and an energy acquisition method for solid-liquid evaporation friction. The energy acquisition device comprises a porous substrate, an organic film layer, a first electrode and a second electrode, wherein the organic film layer, the first electrode and the second electrode are all positioned on the surface of the porous substrate, and the first electrode and the second electrode are positioned at two opposite ends of the organic film layer; the surface of the porous substrate is a hydrophilic surface. The energy collecting device for the solid-liquid evaporation film layer provided by the invention is ingenious in structure, achieves dynamic balance between upward movement and evaporation of liquid and generates continuous direct current electric energy, and compared with the defect that the traditional energy collecting device has intermittency in collecting liquid kinetic energy and wave kinetic energy, the energy collecting device has the advantages that the energy collecting process is simpler and more convenient, the continuous direct current power supply requirement of electronic equipment can be effectively met, and the application range is wider.
Description
Technical Field
The invention relates to the technical field of solid-liquid evaporation friction power generation, in particular to an energy acquisition device for solid-liquid evaporation friction and a preparation method thereof, and an energy acquisition method for solid-liquid evaporation friction.
Background
Energy is a fundamental and strategic resource of the development of the relational society. With the rapid development of human society, especially the proliferation of various mobile electronic devices that are wireless, miniaturized and portable, the power consumption and size of these electronic devices are gradually reduced, and thus higher requirements are placed on energy supply elements in terms of working environment, cost, service life, continuous power supply, and easy and convenient maintenance. The power of current mainstream energy supply is given priority to the battery, and there is a great deal of inconvenience in the battery power supply: on one hand, because the mobile electronic equipment is huge in use quantity and wide in distribution range in the application process, the maintenance, replacement and recovery of battery faults become a difficult project; on the other hand, the oversized batteries add extra volume and weight to the microsystem equipment, and the cadmium, lead and mercury in the waste batteries introduce heavy metal pollution.
In addition, the energy source of the existing battery power supply is mostly fossil energy. However, fossil energy has the defects of environmental pollution, non-regeneration, heavy energy supply equipment and the like. Moreover, fossil fuels (coal, oil and natural gas) are the most used energy in the world at present, and the development and competition of fossil energy in countries of the world draw the economic development speed and international relationship of the world, even the peace of the region; the use of fossil energy also inevitably causes environmental pollution. In the living environment of people, a large amount of clean energy is contained, and a new direction is pointed for developing novel energy for human beings. In recent years, various environmental energy collection technologies, such as wind driven generators, solar cells, friction nano generators and the like, are continuously developed, and collection of novel clean environmental energy is achieved to a certain extent. However, these energy collectors have too much dependence on environmental factors such as wind power, illumination intensity, mechanical vibration waveform, etc., and have the defect of intermittently collecting environmental energy, which is difficult to meet the continuous power supply requirement of electronic equipment.
Disclosure of Invention
In view of the above drawbacks of the prior art, an object of the present invention is to provide an energy collecting device and a manufacturing method for solid-liquid evaporation and friction, and an energy collecting method for solid-liquid evaporation and friction, which can continuously provide dc power, thereby solving the problems that the energy collecting device and the technique in the prior art intermittently collect environmental energy, and are difficult to meet the continuous power supply requirement of electronic devices.
In order to achieve the above and other related objects, the present invention provides an energy harvesting device for solid-liquid evaporation friction, comprising a porous substrate, an organic film layer, a first electrode and a second electrode, wherein the organic film layer, the first electrode and the second electrode are all located on the surface of the porous substrate, and the first electrode and the second electrode are located at two opposite ends of the organic film layer; the surface of the porous substrate is a hydrophilic surface.
Optionally, the porous substrate comprises a silicon carbide substrate, the silicon carbide substrate is prepared by a sintering process, the porosity of the sintered silicon carbide substrate is greater than 40%, and the static contact angle of the material is less than 15 °.
Optionally, the material of the organic film layer includes one or more of polytetrafluoroethylene, polyvinyl chloride, polydimethylsiloxane, polyethylene oxide, chlorinated polyvinyl chloride, polypropylene, polyethylene, polymethyl methacrylate, and polyvinylidene fluoride.
Optionally, the thickness of the organic film layer is less than or equal to 20 micrometers.
Optionally, the organic film layer is located on a single surface of the porous substrate, the first electrode and the second electrode are located on the same surface of the porous substrate as the organic film layer, or the organic film layer is located on two opposite surfaces of the porous substrate, and the first electrode and the second electrode are distributed on one of the two opposite surfaces or both of the two opposite surfaces are provided with the first electrode and the second electrode.
The invention also provides a preparation method of the energy acquisition device for solid-liquid evaporation friction, which comprises the following steps:
providing a porous substrate with a hydrophilic surface, and forming an organic film layer, a first electrode and a second electrode on the same surface of the porous substrate, wherein the first electrode and the second electrode are positioned at two opposite ends of the organic film layer.
Optionally, the step of forming the organic film layer, the first electrode and the second electrode on the same surface of the porous substrate comprises:
forming a metal material layer on the surface of the porous substrate by adopting a sputtering process,
photoetching the metal material layer to form a first electrode and a second electrode at two opposite ends;
and depositing the organic film layer between the first electrode and the second electrode by adopting a chemical vapor deposition process.
Optionally, the porous substrate comprises a silicon carbide substrate, the silicon carbide substrate is prepared by a sintering process, the porosity of the sintered silicon carbide substrate is greater than 40%, and the static contact angle of the material is less than 15 °.
Optionally, the preparation method further comprises the step of welding wires on the surfaces of the first electrode and the second electrode.
Optionally, the material of the organic film layer includes one or more of polytetrafluoroethylene, polyvinyl chloride, polydimethylsiloxane, polyethylene oxide, chlorinated polyvinyl chloride, polypropylene, polyethylene, polymethyl methacrylate, and polyvinylidene fluoride, and the thickness of the organic film layer is less than or equal to 20 micrometers.
The invention also provides an energy collecting method of solid-liquid evaporation friction, which is carried out based on the energy collecting device of solid-liquid evaporation friction in any scheme, and the energy collecting method comprises the steps of connecting a first electrode and a second electrode with an energy storage device, inserting the porous substrate part into liquid to enable one of the first electrode and the second electrode to be positioned in the liquid and the other one to be positioned above the liquid level, enabling the liquid to gradually move upwards along the hydrophilic porous substrate under the driving of capillary force generated by the porous substrate, enabling the liquid above the liquid level of the porous substrate to evaporate in the upwards moving process, driving the liquid in the liquid source to continuously move upwards, and continuously generating solid-liquid contact friction with the porous substrate and an organic film layer on the surface of the porous substrate in the upwards moving process of the liquid to generate continuous potential difference and charge directional movement between the first electrode and the second electrode, finally, the energy of the evaporation friction of the liquid drops is converted into electric energy.
As described above, the energy collecting device for solid-liquid evaporation friction and the preparation method thereof, and the energy collecting method for solid-liquid evaporation friction of the invention have the following beneficial effects: the energy collecting device for the solid-liquid evaporation film layer provided by the invention is ingenious in structure, utilizes the liquid to achieve dynamic balance between upward movement and evaporation and generate continuous direct current electric energy, and has the advantages that compared with the defect that the traditional energy collecting device has intermittence in collecting the liquid kinetic energy and wave kinetic energy, the energy collecting device is simpler and more convenient in energy collecting process, can effectively meet the continuous power supply requirement of electronic equipment, and has a wider application range.
Drawings
Fig. 1 is a schematic top view of an energy harvesting device for solid-liquid evaporation friction provided by the present invention.
Fig. 2 shows a side view of the solid-liquid evaporation friction energy collecting device provided by the invention.
Fig. 3 shows a schematic test diagram of energy collection performed by the solid-liquid evaporation friction energy collection device provided by the invention.
Fig. 4 shows the result of the output performance test of the energy collecting device for solid-liquid evaporation friction provided by the invention for collecting energy.
Fig. 5 and 6 show schematic diagrams of the preparation process of the solid-liquid evaporation friction energy collecting device provided by the invention.
Description of the element reference numerals
11 porous substrate
12 organic film layer
13 first electrode
14 second electrode
15 layer of a metallic material
16 sampling device
17 display device
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Please refer to fig. 1 to 6. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship may be made without substantial technical changes.
As shown in fig. 1 to 4, the present invention provides an energy harvesting device for solid-liquid evaporation and friction, including a porous substrate 11, an organic film layer 12, a first electrode 13 and a second electrode 14, wherein the organic film layer 12, the first electrode 13 and the second electrode 14 are all located on the surface of the porous substrate 11, and the first electrode 13 and the second electrode 14 are located at two opposite ends of the organic film layer 12; the surface of the porous substrate 11 is a hydrophilic surface. When the solid-liquid evaporation friction energy collecting device is used for collecting solid-liquid evaporation energy, the porous substrate 11 is partially inserted into liquid, for example, a water tank, so that one of the first electrode 13 and the second electrode 14 is positioned in the liquid and the other is positioned above the liquid level (namely, the other electrode is not in contact with the liquid), the collecting device forms a large wetting gradient on the upper side and the lower side of the liquid level, the porous substrate 11 generates strong capillary force on the solution below the liquid level due to the porous structure and the characteristics of the super-hydrophilic material, the liquid is driven by the capillary force generated by the porous substrate 11 to gradually move upwards along the hydrophilic porous substrate 11, and the liquid above the liquid level of the porous substrate 11 is continuously evaporated in the upwards moving process, so that the liquid in the liquid source (for example, water in the water tank) is continuously moved upwards; meanwhile, in the process of moving the liquid upwards, solid-liquid contact friction is continuously generated with the porous substrate 11 and the organic film layer 12 on the surface of the porous substrate 11, so that charges on the surfaces of the liquid, the porous substrate 11 and the organic film layer 12 are redistributed to generate a continuous potential difference between the first electrode 13 and the second electrode 14, and in the process of moving the liquid with the triboelectric charges upwards, charge directional movement is generated, and finally, the energy of evaporation friction of the liquid drops is converted into electric energy. The energy collecting device for the solid-liquid evaporation film layer provided by the invention is ingenious in structure, utilizes the liquid to achieve dynamic balance between upward movement and evaporation and generate continuous direct current electric energy, and has the advantages that compared with the defect that the traditional energy collecting device has intermittence in collecting the liquid kinetic energy and wave kinetic energy, the energy collecting device is simpler and more convenient in energy collecting process, can effectively meet the continuous power supply requirement of electronic equipment, and has a wider application range.
The porous substrate 11 mainly functions to provide capillary force to draw liquid (such as aqueous solution) below the liquid level to above the liquid level and move up and down the porous substrate 11 continuously, so that the porous substrate 11 needs to have super-hydrophilic property and high porosity to ensure that the porous substrate 11 can provide sufficient capillary force. The inventors have found through extensive experiments that a porous silicon carbide substrate is a preferred choice. And in a further example, the silicon carbide substrate is prepared by a sintering process, the porosity of the sintered silicon carbide substrate is more than 40%, preferably 40% -75%, and the static contact angle of the material is less than 15 °. Of course, in other examples, the porous substrate 11 may be made of other materials, such as porous nitride, boride substrate, etc.
In one example, the organic film layer 12 is located on a single surface of the porous substrate 11, and the first electrode 13 and the second electrode 14 are located on the same surface of the porous substrate 11 as the organic film layer 12, that is, an energy collecting path is formed only on a single-side surface of the porous substrate.
In another example, the organic film layer 12 is located on two opposite surfaces of the porous substrate 11, the first electrode 13 and the second electrode 14 are disposed on one or both of the two opposite surfaces, the organic film layer 12 is formed on both surfaces of the porous substrate 11 to help protect the aqueous solution from overflowing from the surface of the porous substrate and to help improve the collection efficiency, and the first electrode and the second electrode are formed on both upper and lower ends of the organic film layers on both surfaces, i.e., two energy collection paths are formed on both sides of the porous substrate to help further improve the energy collection efficiency.
By way of example, the material of the organic film layer 12 includes, but is not limited to, polytetrafluoroethylene, polyvinyl chloride, polydimethylsiloxane, polyethylene oxide, chlorinated polyvinyl chloride, polypropylene, polyethylene, polymethyl methacrylate, and polyvinylidene fluoride. Generally, the smaller the thickness of the organic film layer is, the more beneficial the internal resistance of the device is, the more beneficial the external power supply is, but in view of the stability of the whole structure, in a preferred example, the thickness of the organic film layer 12 is less than or equal to 20 micrometers, such as 5 to 20 μm, and more preferably 10 to 15 μm.
The material of the first electrode 13 and the second electrode 14 includes, but is not limited to, gold, silver, aluminum, copper, and the like, and the first electrode 13 and the second electrode 14 may have the same material and structure, but may also be different. The first electrode 13 and the second electrode 14 can be electrically connected with conducting wires (the conducting wires can be connected with the first electrode 13 and the second electrode 14 through a welding process) so as to realize the electrical connection of the energy collecting device for solid-liquid evaporation friction and other electronic devices.
In order to verify the energy collecting effect of the energy collecting device for solid-liquid evaporation friction, the inventor conducts tests. The test procedure is shown in fig. 3. In the testing process, the porous substrate 11 is partially inserted into the water tank, such that one of the first electrode 13 and the second electrode 14 is located in the aqueous solution and the other is located outside the aqueous solution, and the two electrodes are connected to the sampling device 16, such as a Keithley 6514 electrometer with high sampling frequency and large input impedance, and the energy collection result is displayed on the display device 17, such as a PC computer, in real time, and the specific output performance test result is shown in fig. 4. As can be seen from fig. 4, a more stable voltage/current output is continuously obtained during the whole collection process, and the larger the area of the porous substrate 11 is, the higher the temperature is, the more the output voltage/current is increased.
As shown in fig. 5 and 6 (fig. 5 and 6 take an example in which an organic film layer, a first electrode and a second electrode are formed on two opposite surfaces of a porous substrate), the present invention further provides a method for manufacturing an energy harvesting device for solid-liquid evaporation friction, which can be used to manufacture the energy harvesting device for solid-liquid evaporation friction in any of the above embodiments, or the energy harvesting device for solid-liquid evaporation friction can be manufactured based on the manufacturing method, so that the above description of the energy harvesting device for solid-liquid evaporation friction can be fully incorporated herein. Specifically, the preparation method comprises the following steps: providing a porous substrate 11 with a hydrophilic surface, forming an organic film layer 12, a first electrode 13 and a second electrode 14 on the surface of the porous substrate 11, wherein the first electrode 13 and the second electrode 14 are located at two opposite ends of the organic film layer 12. In a further example, the porous substrate 11 comprises a silicon carbide substrate prepared by a sintering process, the sintered silicon carbide substrate having a porosity of greater than 40%, preferably between 40% and 75%, and a static contact angle of the material of less than 15 °. And the silicon carbide substrate can be cleaned by adopting a standard MEMS cleaning process after sintering is finished, for example, an RCA cleaning method is adopted for cleaning, so that the porous surface of the silicon carbide substrate is prevented from being blocked by impurities.
In one example, the forming of the organic film 12, the first electrode 13 and the second electrode 14 on the surface of the porous substrate 11 includes the steps of:
forming a metal material layer 15 on the surface of the porous substrate 11 by using a sputtering process, where the metal material layer 15 includes, but is not limited to, a gold layer, an aluminum layer, a silver layer, or a composite layer of multiple metal materials, as shown in fig. 5;
performing photolithography and etching on the metal material layer 15 to form a first electrode 13 and a second electrode 14 at two opposite ends, as shown in fig. 6;
the organic film 12 is deposited between the first electrode 13 and the second electrode 14 by using a chemical vapor deposition process, and the resulting structure is shown in fig. 2, where the material of the organic film 12 includes, but is not limited to, one or more combinations of polytetrafluoroethylene, polyvinyl chloride, polydimethylsiloxane, polyethylene oxide, chlorinated polyvinyl chloride, polypropylene, polyethylene, polymethyl methacrylate, and polyvinylidene fluoride, and the thickness of the organic film 12 is less than or equal to 20 micrometers, for example, 5 to 20 μm, and preferably 10 to 15 μm (both inclusive).
Of course, in other examples, the organic film 12 may be formed on the surface of the porous substrate 11, the electrode positions may be defined by photolithography and etching, and then the metal may be deposited at the predetermined positions to form the first electrode 13 and the second electrode 14, and the method for forming the organic film 12 may also be a coating method or other methods.
After the first electrode 13 and the second electrode 14 are formed, a lead wire may be welded to the surfaces of the first electrode 13 and the second electrode 14.
The invention also provides an energy acquisition method for solid-liquid evaporation friction, which is carried out based on the energy acquisition device for solid-liquid evaporation friction in any scheme, so that the description of the energy acquisition device for solid-liquid evaporation friction can be fully cited here, and is not repeated. The energy collecting method comprises the steps of partially inserting the porous substrate 11 into liquid, such as a water tank, so that one of the first electrode 13 and the second electrode 14 is positioned in the liquid and the other is positioned above the liquid level (i.e. the other electrode is not in contact with the liquid), forming a larger wetting gradient on the upper side and the lower side of the liquid level by the collecting device, generating a strong capillary force on the solution below the liquid level by the porous substrate 11 due to the characteristics of the porous structure and the super-hydrophilic material, gradually moving the liquid upwards along the hydrophilic porous substrate 11 under the driving of the capillary force generated by the porous substrate 11, and continuously evaporating the liquid above the liquid level of the porous substrate 11 in the upwards moving process, thereby driving the liquid in the liquid source (such as water in the water tank) to continuously move upwards; meanwhile, in the process of moving the liquid upwards, solid-liquid contact friction is continuously generated with the porous substrate 11 and the organic film layer 12 on the surface of the porous substrate 11, so that charges on the surfaces of the liquid, the porous substrate 11 and the organic film layer 12 are redistributed to generate a continuous potential difference between the first electrode 13 and the second electrode 14, and in the process of moving the liquid with the triboelectric charges upwards, charge directional movement is generated, and finally, the energy of evaporation friction of the liquid drops is converted into electric energy.
It should be noted that the energy collection process should be open in the atmosphere to facilitate the diffusion of water vapor, and the higher the ambient temperature is, the faster the evaporation is, the more electric energy is collected.
In summary, the invention provides an energy collecting device for solid-liquid evaporation friction and a preparation method thereof, and an energy collecting method for solid-liquid evaporation friction. The energy acquisition device comprises a porous substrate, an organic film layer, a first electrode and a second electrode, wherein the organic film layer, the first electrode and the second electrode are all positioned on the surface of the porous substrate, and the first electrode and the second electrode are positioned at two opposite ends of the organic film layer; the surface of the porous substrate is a hydrophilic surface. The energy collecting device for the solid-liquid evaporation film layer provided by the invention is ingenious in structure, utilizes the liquid to achieve dynamic balance between upward movement and evaporation and generate continuous direct current electric energy, and has the advantages that compared with the defect that the traditional energy collecting device has intermittence in collecting the liquid kinetic energy and wave kinetic energy, the energy collecting device is simpler and more convenient in energy collecting process, can effectively meet the continuous power supply requirement of electronic equipment, and has a wider application range. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. The utility model provides an energy harvesting device of solid-liquid evaporation friction which characterized in that includes: the organic membrane layer, the first electrode and the second electrode are all positioned on the surface of the porous substrate, and the first electrode and the second electrode are positioned at two opposite ends of the organic membrane layer; the surface of the porous substrate is a hydrophilic surface.
2. The energy harvesting device of claim 1, wherein the porous substrate comprises a silicon carbide substrate prepared by a sintering process, the sintered silicon carbide substrate having a porosity greater than 40% and a static contact angle of the material of less than 15 °.
3. The energy harvesting device of claim 1, wherein the organic film layer comprises a material selected from the group consisting of polytetrafluoroethylene, polyvinyl chloride, polydimethylsiloxane, polyethylene oxide, chlorinated polyvinyl chloride, polypropylene, polyethylene, polymethyl methacrylate, and polyvinylidene fluoride, and wherein the organic film layer has a thickness of 20 microns or less.
4. The energy harvesting device of any one of claims 1-3, wherein the organic membrane layer is disposed on a single surface of the porous substrate, and the first and second electrodes are disposed on the same surface of the porous substrate as the organic membrane layer, or the organic membrane layer is disposed on two opposing surfaces of the porous substrate, and the first and second electrodes are disposed on one or both of the two opposing surfaces.
5. A preparation method of an energy acquisition device for solid-liquid evaporation friction is characterized by comprising the following steps:
providing a porous substrate with a hydrophilic surface, and forming an organic film layer, a first electrode and a second electrode on the surface of the porous substrate, wherein the first electrode and the second electrode are positioned at two opposite ends of the organic film layer.
6. The method according to claim 5, wherein the step of forming the organic film layer, the first electrode and the second electrode on the same surface of the porous substrate comprises:
forming a metal material layer on the surface of the porous substrate by adopting a sputtering process,
photoetching the metal material layer to form a first electrode and a second electrode at two opposite ends;
and depositing the organic film layer between the first electrode and the second electrode by adopting a chemical vapor deposition process.
7. The method of claim 5, wherein the porous substrate comprises a silicon carbide substrate, the silicon carbide substrate is prepared by a sintering process, the sintered silicon carbide substrate has a porosity of greater than 40% and a static contact angle of the material of less than 15 °.
8. The method according to claim 5, further comprising a step of bonding wires to the surfaces of the first and second electrodes.
9. The preparation method of claim 5, wherein the material of the organic film layer comprises one or more of polytetrafluoroethylene, polyvinyl chloride, polydimethylsiloxane, polyethylene oxide, chlorinated polyvinyl chloride, polypropylene, polyethylene, polymethyl methacrylate and polyvinylidene fluoride, and the thickness of the organic film layer is less than or equal to 20 microns.
10. A method for collecting energy through solid-liquid evaporation and friction, which is based on the solid-liquid evaporation and friction energy collecting device of any one of claims 1-4, and comprises the steps of connecting a first electrode and a second electrode with an energy storage device, inserting the porous substrate part into the liquid so that one of the first electrode and the second electrode is located in the liquid and the other is located above the liquid level, wherein the liquid is driven by capillary force generated by the porous substrate to gradually move upwards along the hydrophilic porous substrate, the liquid above the liquid level of the porous substrate is continuously evaporated during the upwards movement process, so as to drive the liquid in the liquid source to continuously move upwards, and during the upwards movement of the liquid, solid-liquid contact friction is continuously generated with the porous substrate and an organic film layer on the surface of the porous substrate to generate continuous potential difference and charge directional movement between the first electrode and the second electrode, finally, the energy of the evaporation friction of the liquid drops is converted into electric energy.
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| CN110242276A (en) * | 2019-05-29 | 2019-09-17 | 中国地质大学（武汉） | A kind of underground bubble void fraction measurement sensor based on friction nanometer generating |
| US20200169188A1 (en) * | 2018-11-26 | 2020-05-28 | Purdue Research Foundation | Novel triboelectric nanogenerators |
| CN111804148A (en) * | 2020-06-29 | 2020-10-23 | 浙江美易膜科技有限公司 | High-porosity hydrophilic microporous membrane, preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104980060A (en) * | 2014-04-09 | 2015-10-14 | 北京纳米能源与系统研究所 | Triboelectric nanometer generator capable of collecting liquid mechanical energy and power generating method thereof |
| US20200169188A1 (en) * | 2018-11-26 | 2020-05-28 | Purdue Research Foundation | Novel triboelectric nanogenerators |
| CN110242276A (en) * | 2019-05-29 | 2019-09-17 | 中国地质大学（武汉） | A kind of underground bubble void fraction measurement sensor based on friction nanometer generating |
| CN111804148A (en) * | 2020-06-29 | 2020-10-23 | 浙江美易膜科技有限公司 | High-porosity hydrophilic microporous membrane, preparation method and application thereof |
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