Friction nano-generator device combining droplet microfluidics and microneedle

Abstract

The utility model discloses a friction nano-generator device combining droplet microfluidics and a microneedle. The friction nano-generator device comprises a support, a microfluidic droplet generation chip and a droplet friction nano-generator, wherein the microfluidic droplet generation chip and the droplet friction nano-generator are arranged on the support; the micro-fluidic liquid drop generation chip is used for generating liquid drops which drop to a friction energy collection area of the liquid drop friction nano-generator; a friction energy collecting area of the liquid drop friction nano-generator is arranged in an inclined mode, and the liquid drop friction nano-generator is used for receiving liquid drops to generate electricity. The friction nano-generator is combined with the microfluidic technology to collect natural mechanical energy and convert the natural mechanical energy into electric energy, the device is extremely portable and applicable, a self-driving function can be provided for a micro-electro-mechanical system, power is supplied to instruments such as a microsensor, and market scenes are expanded.

Description

Technical Field

[0001] The utility model relates to the technical field of microfluidics, and in particular to a friction nanogenerator device combining droplet microfluidics with microneedles. Background Art

[0002] As the name suggests, microfluidics technology controls fluids within micron-scale flow channels, enabling operations such as sample preparation, separation, and detection to be completed on a chip. Droplet friction nanogenerators, on the other hand, can collect droplet energy to generate electricity. Both are widely used in microelectromechanical systems (MEMS). However, there is currently a lack of an instrument that can control the shape and flow of droplets so that the friction nanogenerator can reach maximum power and be applied to other devices to achieve self-driving functions. In other words, there is a lack of a device that combines microfluidics with nanogenerators. Utility Model Content

[0003] The purpose of the utility model is to provide a friction nanogenerator device that combines droplet microfluidics with microneedles, so as to solve the problem that the prior art lacks a device that combines microfluidics technology with nanogenerators.

[0004] In order to solve the above technical problems, the utility model provides a friction nanogenerator device combining droplet microfluidics and microneedles, including a bracket, and a microfluidic droplet generation chip and a droplet friction nanogenerator arranged on the bracket; the microfluidic droplet generation chip is used to generate droplets that fall into the friction energy collection area of ​​the droplet friction nanogenerator; the friction energy collection area of ​​the droplet friction nanogenerator is arranged at an angle, and the droplet friction nanogenerator is used to receive the droplets to generate electricity.

[0005] In one embodiment, the bracket includes a lower base plate, a support column and an upper base plate; the droplet friction nanogenerator is provided on the lower base plate; the lower end of the support column is connected to the lower base plate, and the upper end of the support column is connected to the upper base plate, so that the upper base plate is suspended above the lower base plate; the microfluidic droplet generation chip is provided on the upper base plate.

[0006] In one embodiment, the upper base plate is provided with an on-board micropore array and a hollow microneedle array provided below the on-board micropore array, wherein each micropore of the on-board micropore array is respectively connected to each hollow microneedle of the hollow microneedle array, and the droplet output portion of the hollow microneedle array is aligned with the friction energy collection area of ​​the droplet friction nanogenerator; the microfluidic droplet generation chip is provided with a droplet output micropore array, and each micropore of the droplet output micropore array is respectively connected to each micropore of the on-board micropore array.

[0007] In one embodiment, the walls of each micropore of the micropore array on the plate and the inner walls of each hollow microneedle of the hollow microneedle array are coated with an oleophobic and hydrophilic coating.

[0008] In one embodiment, a hemisphere is provided on the lower base plate; a hemispherical cover is provided at the bottom of the droplet friction nanogenerator, and the hemispherical cover is sleeved outside the hemisphere. The movable assembly of the hemispherical cover and the hemisphere is used to adjust the placement angle of the droplet friction nanogenerator.

[0009] In one embodiment, a water recovery tray is provided on the lower base plate, and the water recovery tray is provided at the location where the droplets slide down from the droplet friction nanogenerator.

[0010] In one embodiment, the microfluidic droplet generation chip includes an oil phase inlet channel, a water phase inlet channel, a curved channel, an oil phase output channel and a water phase output channel; the oil phase inlet channel is narrower than the water phase inlet channel, and the oil phase inlet channel and the water phase inlet channel obliquely intersect, so that the outlets of the oil phase inlet channel and the water phase inlet channel are both connected to the inlet of the curved channel; the outlet of the curved channel is connected to the inlet of the oil phase output channel and the inlet of the water phase output channel; the oil phase output channel is wider than the water phase output channel; the outlet of the water phase output channel is connected to the adjacent outlet of the oil phase output channel, and a droplet output micropore array is provided in the middle of the water phase output channel.

[0011] In one embodiment, the oil phase inlet flow channel and the water phase inlet flow channel obliquely intersect to form an angle of 50° to 70°.

[0012] In one embodiment, the walls of each micropore of the droplet output micropore array are covered with an oleophobic and hydrophilic microporous membrane.

[0013] In one embodiment, the droplet friction nanogenerator includes a glass substrate, a polyimide layer, a graphene positive electrode, a fluorinated graphene negative electrode and a polytetrafluoroethylene layer; the polyimide layer is arranged on the upper surface of the glass substrate; the graphene positive electrode is arranged on the polyimide layer; the fluorinated graphene negative electrode and the polytetrafluoroethylene layer are both arranged on the graphene positive electrode; the polytetrafluoroethylene layer is the friction energy collection area of ​​the droplet friction nanogenerator.

[0014] The beneficial effects of the utility model are as follows:

[0015] 1. In order to obtain a high-throughput droplet chip, the microfluidic droplet generation chip of this utility model adopts an innovative chip structure and flow channel design. Its microporous structure and microporous membrane separate the oil and water phases with high precision, thereby forming high-throughput droplets;

[0016] 2. The combination of a microfluidic droplet generation chip and a hollow microneedle array can effectively achieve high-throughput droplet generation, stably obtain uniform droplets with controllable volume and quantity, enabling the droplet friction nanogenerator to maximize power.

[0017] 3. Combining friction nanogenerators with microfluidics technology to collect natural mechanical energy and convert it into electrical energy is highly portable and applicable. It can provide self-driving functions for micro-electromechanical systems, power instruments such as microsensors, and expand market scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a structural diagram provided by an embodiment of the present utility model;

[0020] Figure 2 yes Figure 1 Schematic diagram of the support structure Figure 1 ;

[0021] Figure 3 yes Figure 2 Schematic diagram of the microwell array structure on the plate;

[0022] Figure 4 yes Figure 1 Schematic diagram of the support structure Figure 2 ;

[0023] Figure 5 yes Figure 4 Schematic diagram of the hollow microneedle array structure;

[0024] Figure 6 yes Figure 1 Schematic diagram of the microfluidic droplet generation chip structure;

[0025] Figure 7 yes Figure 1 Schematic diagram of the droplet friction nanogenerator structure;

[0026] Figure 8 yes Figure 7 Schematic diagram of the disassembled structure.

[0027] The reference numerals are as follows:

[0028] 10. Bracket; 11. Lower base; 12. Support column; 13. Upper base; 14. Micropore array on the plate; 15. Hollow microneedle array; 16. Hemisphere; 17. Water recovery tray;

[0029] 20. Microfluidic droplet generation chip; 21. Droplet output micropore array; 22. Oil phase inlet channel; 23. Water phase inlet channel; 24. Bend channel; 25. Oil phase output channel; 26. Water phase output channel;

[0030] 30. Droplet friction nanogenerator; 31. Hemispherical cover; 32. Glass substrate; 33. Polyimide layer; 34. Graphene positive electrode; 35. Fluorinated graphene negative electrode; 36. Polytetrafluoroethylene layer. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0032] The utility model provides a friction nanogenerator device that combines droplet microfluidics with microneedles, which is implemented as follows: Figure 1 As shown, it includes a bracket 10, and a microfluidic droplet generation chip 20 and a droplet friction nanogenerator 30 arranged on the bracket 10; the microfluidic droplet generation chip 20 is used to generate droplets that fall into the friction energy collection area of ​​the droplet friction nanogenerator 30; the friction energy collection area of ​​the droplet friction nanogenerator 30 is arranged at an angle, and the droplet friction nanogenerator 30 is used to receive droplets for power generation.

[0033] During application, the microfluidic droplet generation chip 20 will be able to generate high-throughput droplets, which will drip into the friction energy collection area of ​​the droplet friction nanogenerator 30. The friction generated by the droplets and the droplet friction nanogenerator 30 will generate electrical energy, thereby realizing the combination of friction nanogenerator and microfluidic technology to collect natural mechanical energy and convert it into electrical energy. It is highly portable and applicable, can provide self-driving function for micro-electromechanical systems, power instruments such as microsensors, and expand market scenarios.

[0034] like Figure 1 As shown, this embodiment provides a bracket 10 including a lower base plate 11, a support column 12 and an upper base plate 13; a droplet friction nanogenerator 30 is provided on the lower base plate 11; the lower end of the support column 12 is connected to the lower base plate 11, and the upper end of the support column 12 is connected to the upper base plate 13, so that the upper base plate 13 is suspended above the lower base plate 11; a microfluidic droplet generation chip 20 is provided on the upper base plate 13.

[0035] After adopting this setting, the microfluidic droplet generation chip 20 can be suspended above the droplet friction nanogenerator 30, so that the droplets generated by the microfluidic droplet generation chip 20 can better generate friction and generate electricity when they drip onto the droplet friction nanogenerator 30.

[0036] like Figures 1 to 5 As shown, this embodiment is provided with an on-board micropore array 14 on the upper base plate 13, and a hollow microneedle array 15 provided below the on-board micropore array 14, wherein each micropore of the on-board micropore array 14 is respectively connected to each hollow microneedle of the hollow microneedle array 15, and the droplet output portion of the hollow microneedle array 15 is aligned with the friction energy collection area of ​​the droplet friction nanogenerator 30; the microfluidic droplet generation chip 20 is provided with a droplet output micropore array 21, and each micropore of the droplet output micropore array 21 is respectively connected to each micropore of the on-board micropore array 14.

[0037] After adopting this setting method, the droplets generated by the microfluidic droplet generation chip 20 will be transported to the micropore array 14 on the plate, and then transferred from the micropore array 14 on the plate to the hollow microneedle array 15; since each hollow microneedle of the hollow microneedle array 15 is hollow inside, the combination of capillary force and gravity will enable high-throughput droplets to drip quickly, and the size, volume and speed of each droplet can be accurately controlled through the microneedle morphology and surface force, thereby enhancing the control of the droplets and improving the efficiency of the droplet friction nanogenerator 30.

[0038] In this embodiment, the walls of each micropore of the micropore array 14 on the plate and the inner walls of each hollow microneedle of the hollow microneedle array 15 are coated with an oleophobic hydrophilic coating. For example, the oleophobic hydrophilic coating here can be polyethylene glycol.

[0039] With this setup, the oleophobic-hydrophilic coating facilitates the capture and high-throughput dripping of water droplets.

[0040] like Figure 1 、 Figure 2 and Figure 7 As shown, in this embodiment, a hemispherical body 16 is provided on the lower base plate 11; a hemispherical cover 31 is provided at the bottom of the droplet friction nanogenerator 30, and the hemispherical cover 31 is sleeved outside the hemispherical body 16. The movable assembly of the hemispherical cover 31 and the hemispherical body 16 is used to adjust the placement angle of the droplet friction nanogenerator 30.

[0041] After adopting this setting method, the droplet friction nanogenerator 30 will have more optional placement angles, thereby greatly improving the efficiency of collecting droplets.

[0042] like Figure 1As shown, in this embodiment, a water recovery tray 17 is provided on the lower base plate 11 , and the water recovery tray 17 is provided at the place where the droplets slide down from the droplet friction nanogenerator 30 .

[0043] After adopting this setting mode, the water recovery tray 17 is used to realize the recovery of liquid droplets.

[0044] like Figure 1 and Figure 6 As shown, this embodiment provides a microfluidic droplet generation chip 20 including an oil phase inlet channel 22, a water phase inlet channel 23, a curved channel 24, an oil phase output channel 25 and a water phase output channel 26; the oil phase inlet channel 22 is narrower than the water phase inlet channel 23, and the oil phase inlet channel 22 and the water phase inlet channel 23 obliquely intersect, so that the outlets of the oil phase inlet channel 22 and the water phase inlet channel 23 are both connected to the inlet of the curved channel 24; the outlet of the curved channel 24 is connected to the inlet of the oil phase output channel 25 and the inlet of the water phase output channel 26; the oil phase output channel 25 is wider than the water phase output channel 26; the outlet of the water phase output channel 26 is connected to the adjacent outlet of the oil phase output channel 25, and a droplet output micropore array 21 is provided in the middle of the water phase output channel 26.

[0045] With this setup, the flow channel uses oil as the continuous phase and water as the separated phase to separate water droplets.

[0046] First, the oil phase enters from the inlet of the oil phase entry channel 22 to form a continuous phase in the channel, and the water phase enters from the water phase entry channel 23, and the oil phase entry channel 22 will obliquely intersect with the water phase entry channel 23. For example, the oil phase entry channel 22 and the water phase entry channel 23 can be set to obliquely intersect to form an angle of 50° to 70°. In this embodiment, the oil phase entry channel 22 and the water phase entry channel 23 obliquely intersect to form an angle of 60°.

[0047] Then, because the oil phase entering the flow channel 22 is narrower than the water phase entering the flow channel 23, the flow rate of the oil phase entering the flow channel 22 will be faster than the flow rate of the water phase entering the flow channel 23, the shear force is stronger than the water phase flow channel, and the two flow channels form an angle of 60°. The water phase is sheared by the oil phase to form droplets, and then passes through the continuous bending flow channel 24, and the rectified droplets form an orderly array.

[0048] Finally, after the rectified droplets form an orderly array, they will enter the water phase output channel 26. The water phase output channel 26 is provided with a continuous droplet output micropore array 21 to successfully separate the droplet water phase and oil phase. The oil phase will flow into the oil phase output channel 25 and out.

[0049] In this embodiment, the walls of each micropore of the droplet output micropore array 21 are covered with an oleophobic and hydrophilic microporous membrane.

[0050] After adopting this setting, the droplet output microporous array 21 and the microporous membrane cooperate with each other, allowing only water droplets to be captured and passed through while the oil is intercepted, thereby achieving accurate separation of the water phase and the oil phase. Because the fluid enters the narrower U-shaped water phase output channel 26 after passing through the longer curved channel 24, the water droplets are first intercepted and enter the channel with a faster flow rate. After passing through the droplet output microporous array, they are separated to obtain droplets with a higher flux and fixed shape. At the same time, due to the accelerated flow rate, the probability of the oil phase remaining in the microporous membrane is reduced and it is not easy to cause blockage, making the power generation efficiency of the entire device higher.

[0051] like Figure 1 、 Figure 7 and Figure 8 As shown, this embodiment sets up a droplet friction nanogenerator 30 including a glass substrate 32, a polyimide layer 33, a graphene positive electrode 34, a fluorinated graphene negative electrode 35 and a polytetrafluoroethylene layer 36; the polyimide layer 33 is arranged on the upper surface of the glass substrate 32; the graphene positive electrode 34 is arranged on the polyimide layer 33; the fluorinated graphene negative electrode 35 and the polytetrafluoroethylene layer 36 are both arranged on the graphene positive electrode 34; the polytetrafluoroethylene layer 36 is the friction energy collection area of ​​the droplet friction nanogenerator 30.

[0052] During the production of the droplet triboelectric nanogenerator 30, the polyimide layer 33 is fluorinated and then formed into a double-layer material with the polytetrafluoroethylene layer 36. Laser induction is performed on one side of the polyimide layer 33, resulting in a rectangular area of ​​graphene positive electrode 34 in the center. The polyimide layer 33 in the double-layer structure is selectively excited on the side of the polytetrafluoroethylene layer 36, thereby diffusing and decomposing fluorine atoms into a fluorinated graphene negative electrode 35 with super-hydrophobic properties during the induction process. The polytetrafluoroethylene layer 36 itself has hydrophobic properties and serves as the dielectric layer of the generator, forming the droplet collection area of ​​the triboelectric nanogenerator 30. When the droplet slides against the air, a large amount of negative charge accumulates on the polytetrafluoroethylene layer 36, electrostatically inducing an opposite charge on the back graphene positive electrode 34. When the droplet impacts the air, a closed-loop electrical system is formed in the entire system, breaking the uniform charge on the graphene surface, triggering electrons to flow through the graphene, generating a transient current, and converting the free energy of the droplet into usable electrical energy.

[0053] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A triboelectric nanogenerator device combining droplet microfluidics and microneedles, characterized in that: It includes a bracket, and a microfluidic droplet generation chip and a droplet friction nanogenerator arranged on the bracket; The microfluidic droplet generation chip is used to generate droplets that fall into the friction energy collection area of ​​the droplet friction nanogenerator; The friction energy collection area of ​​the droplet friction nanogenerator is arranged obliquely, and the droplet friction nanogenerator is used to receive the droplets to generate electricity.

2. The triboelectric nanogenerator device according to claim 1, characterized in that: The bracket includes a lower base plate, a support column and an upper base plate; The droplet friction nanogenerator is provided on the lower base plate; The lower end of the support column is connected to the lower base plate, and the upper end of the support column is connected to the upper base plate, so that the upper base plate is suspended above the lower base plate; The microfluidic droplet generation chip is arranged on the upper base plate.

3. The triboelectric nanogenerator device according to claim 2, characterized in that: The upper base plate is provided with an on-board micropore array and a hollow microneedle array provided below the on-board micropore array, wherein each micropore of the on-board micropore array is connected to each hollow microneedle of the hollow microneedle array, and the droplet output portion of the hollow microneedle array is aligned with the friction energy collection area of ​​the droplet friction nanogenerator; The microfluidic droplet generation chip is provided with a droplet output micropore array, and each micropore of the droplet output micropore array is respectively connected to each micropore of the micropore array on the plate.

4. The triboelectric nanogenerator device according to claim 3, characterized in that: The walls of each micropore of the micropore array on the plate and the inner walls of each hollow microneedle of the hollow microneedle array are coated with an oleophobic and hydrophilic coating.

5. The triboelectric nanogenerator device according to claim 2, characterized in that: A hemisphere is provided on the lower base plate; A hemispherical cover is provided at the bottom of the droplet friction nanogenerator, and the hemispherical cover is sleeved outside the hemispherical body. The movable assembly of the hemispherical cover and the hemispherical body is used to adjust the placement angle of the droplet friction nanogenerator.

6. The triboelectric nanogenerator device according to claim 2, characterized in that: A water recovery tray is provided on the lower bottom plate, and the water recovery tray is provided at the location where the liquid droplets slide down from the liquid droplet friction nanogenerator.

7. The triboelectric nanogenerator device according to claim 1, characterized in that: The microfluidic droplet generation chip includes an oil phase inlet flow channel, a water phase inlet flow channel, a bending flow channel, an oil phase output flow channel and a water phase output flow channel; The oil phase inlet flow channel is narrower than the water phase inlet flow channel, and the oil phase inlet flow channel and the water phase inlet flow channel obliquely intersect, so that the outlets of the oil phase inlet flow channel and the water phase inlet flow channel are both connected to the inlet of the curved flow channel; The outlet of the bent flow channel is connected to the inlet of the oil phase output flow channel and the inlet of the water phase output flow channel; The oil phase output flow channel is wider than the water phase output flow channel; The outlet of the water phase output flow channel is connected to the outlet of the oil phase output flow channel at an adjacent position, and a liquid drop output micropore array is provided in the middle of the water phase output flow channel.

8. The triboelectric nanogenerator device according to claim 7, characterized in that: The oil phase inlet flow channel and the water phase inlet flow channel obliquely intersect to form an angle of 50° to 70°.

9. The triboelectric nanogenerator device according to claim 7, characterized in that: The walls of each micropore of the droplet output micropore array are covered with an oleophobic and hydrophilic microporous membrane.

10. The triboelectric nanogenerator device according to claim 1, characterized in that: The droplet friction nanogenerator includes a glass substrate, a polyimide layer, a graphene positive electrode, a fluorinated graphene negative electrode and a polytetrafluoroethylene layer; The polyimide layer is provided on the upper surface of the glass substrate; The graphene positive electrode is provided on the polyimide layer; The fluorinated graphene negative electrode and the polytetrafluoroethylene layer are both provided on the graphene positive electrode; The polytetrafluoroethylene layer is the friction energy collection area of ​​the droplet friction nanogenerator.

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