A dielectrophoresis and roller array type friction nanogenerator combined micro-particle manipulation device

Abstract

The application provides a micro-particle manipulation device combined with dielectrophoresis and a roller array type friction nanogenerator, comprising a roller array type friction nanogenerator, a rectification filtering and voltage stabilizing circuit and a micro-fluidic chip, wherein the roller array type friction nanogenerator is used for converting ocean energy into electric energy, and an output end of the roller array type friction nanogenerator is connected with an input end of the rectification filtering and voltage stabilizing circuit; the rectification filtering and voltage stabilizing circuit is used for controlling the voltage of each friction unit in the roller array type friction nanogenerator to be converted from alternating current into direct current, and controlling each voltage to be connected in series and parallel, and an output end of the rectification filtering and voltage stabilizing circuit is connected with an input end of the micro-fluidic chip; and the micro-fluidic chip is used for sorting micro-plastic particles in the ocean, and the input end of the micro-fluidic chip is connected with the output end of the rectification filtering and voltage stabilizing circuit. The device realizes the combination of the friction nanogenerator technology and the micro-fluidic technology, can well realize the conversion of energy, and has good portability and safety.

Description

Technical Field

[0001] This invention relates to the field of energy conversion and marine microplastic particle pollutant sorting technology, and more particularly to a microparticle manipulation device combining dielectrophoresis and roller array triboelectric nanogenerator. Background Technology

[0002] Triboelectric nanogenerators (TENGs) are a novel energy harvesting technology that has emerged in recent years. They convert mechanical energy into electrical energy by utilizing the coupling effect of triboelectric charging and electrostatic induction. Triboelectric charging occurs in the relative motion between any two different materials, giving TENGs advantages such as simple structure, low cost, and portability. Therefore, TENGs are currently widely used in energy, sensing, and other fields.

[0003] Microfluidic chip technology integrates the basic operational units of biological, chemical, and medical analysis processes—sample preparation, reaction, separation, and detection—onto a single micrometer-scale chip, automating the entire analytical process. Its characteristics include miniaturization, micro-platform, multidisciplinary integration, and microscale. Microfluidic technology has evolved into numerous applications, such as particle focusing, particle sorting, fluid mixing, cell stretching, and cell capture. These applications are widely used in chemical analysis, biopharmaceuticals, medicine, and the environmental field, playing a crucial role in disease diagnosis and treatment, biological cell separation, and the separation of marine particulate pollutants.

[0004] Water waves are widely distributed globally and contain one of the richest energy sources. Ocean water waves are characterized by low frequency, large-area distribution, and random wave peaks. Using triboelectric nanoarrays to harvest ocean energy is highly efficient and feasible. The triboelectric nanogenerator's ability to harvest energy in the low-frequency range gives it a unique advantage in ocean energy harvesting. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a microparticle manipulation device combining dielectrophoresis and a roller array triboelectric nanogenerator. This invention integrates a triboelectric nanogenerator with a microfluidic chip, enabling the conversion of ocean energy into electrical energy, thereby replacing large power supply equipment, overcoming the drawbacks of traditional power supply methods, and promoting the development of microfluidic chips for the separation of marine microparticle pollutants.

[0006] The technical means employed in this invention are as follows:

[0007] A microparticle manipulation device combining dielectrophoresis and a roller array triboelectric nanogenerator includes: a roller array triboelectric nanogenerator, a rectifier-filter-regulator circuit, and a microfluidic chip, wherein:

[0008] The roller array triboelectric nanogenerator is used to convert ocean energy into electrical energy, and the output terminal of the roller array triboelectric nanogenerator is connected to the input terminal of the rectifier, filter and voltage regulator circuit.

[0009] The rectifier-filter-regulator circuit is used to control the AC-to-DC conversion of the voltage of each friction unit in the roller array triboelectric nanogenerator, and to control the series merging of each voltage. The output of the rectifier-filter-regulator circuit is connected to the input of the microfluidic chip.

[0010] The microfluidic chip is used to sort microplastic particles in the ocean, and the input end of the microfluidic chip is connected to the output end of the rectifier, filter and voltage regulator circuit.

[0011] Furthermore, the roller array triboelectric nanogenerator is made of acrylic sheet and includes a base, a balance bracket, a balance shaft, bearings, and multiple friction units, wherein:

[0012] The balance support includes a first support and a second support, which are respectively disposed on both sides of the base;

[0013] The bearing includes a first bearing and a second bearing, with the first bearing located at the upper end of the first bracket and the second bearing located at the upper end of the second bracket.

[0014] The balance shaft includes a first shaft and a second shaft, which are cross-connected; the two ends of the first shaft are movably connected to a first bearing and a second bearing, respectively; the two ends of the second shaft are connected to friction units, respectively.

[0015] The friction unit includes multiple left friction units and multiple right friction units. Each left friction unit includes a left friction roller and a left friction channel, and each right friction unit includes a right friction roller and a right friction channel.

[0016] Furthermore, the diameter of the left friction roller is smaller than the width of the left friction channel, and the diameter of the right friction roller is smaller than the width of the right friction channel, ensuring that the rollers can roll freely within the channels.

[0017] Furthermore, each friction left roller and each friction right roller has an independent layer attached to its surface. The independent layer is a first friction material with the same size and shape as the roller. Each friction left channel and each friction right channel has a conductive electrode and a second friction material attached to its bottom respectively. The conductive electrode is a cross-shaped electrode, and the two sets of electrodes cross each other but do not contact each other.

[0018] Furthermore, the first friction material is a PET film, the second friction material is a PTFE film, and the conductive electrode is a copper foil.

[0019] Furthermore, the rectifier-filter-regulator circuit includes a PCB base plate, a bridge rectifier diode, a Zener diode, and a high-voltage capacitor mounted on the PCB base plate. The electricity generated by friction is converted into DC by several bridge rectifier diodes, and then they are connected in series for unified filtering and voltage regulation to power the microfluidic chip.

[0020] Furthermore, the microfluidic chip includes a microchannel layer, a sample inlet, a first outlet, a sheath fluid inlet, a second outlet, a barrier array, and a main channel, wherein:

[0021] The sample inlet, first outlet, sheath fluid inlet, second outlet, barrier array, and main channel are all located on the microchannel layer; the two ports of the main channel are connected to the sample inlet and the first outlet, respectively; one side wall of the main channel has two channel ports, which are used to connect the sheath fluid inlet and the second outlet, respectively; a barrier array is set inside the main channel between the two channel ports;

[0022] Dielectric electrophoresis sorting uses DC dielectric electrophoresis, which generates a non-uniform electric field in the main channel through a barrier array. After passing through this area, microplastic particles of different sizes will enter different outlets to achieve the screening and separation of microplastic particles.

[0023] Furthermore, the top of the microfluidic chip is also provided with a cover plate, and both the cover plate and the microchannel layer are made of PDMS material and are fabricated using a photolithography casting process.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] 1. The microparticle manipulation device combining dielectrophoresis and roller array triboelectric nanogenerator provided by this invention can effectively realize energy conversion, convert ocean energy into electrical energy to replace traditional power sources to power microfluidic chips, and can collect large-scale blue energy through array, which has a very positive impact on the field of new energy power generation.

[0026] 2. The microparticle manipulation device combining dielectrophoresis and roller array triboelectric nanogenerator provided by this invention enables triboelectric nanogenerators to replace traditional large power supply equipment, making microfluidic operation safer and more portable.

[0027] 3. The microparticle manipulation device combining dielectrophoresis and roller array triboelectric nanogenerator provided by this invention is of great significance for marine environmental monitoring in my country and is an effective method for sorting microparticles in the ocean.

[0028] Based on the above reasons, this invention can be widely applied in fields such as energy conversion and marine microplastic particle pollutant sorting. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the roller array triboelectric nanogenerator structure of the present invention.

[0031] Figure 2 This is a schematic diagram of the principle of the roller array triboelectric nanogenerator of the present invention.

[0032] Figure 3 This is a structural diagram of the friction unit of the roller array triboelectric nanogenerator of the present invention.

[0033] Figure 4 This is a schematic diagram of the friction material bonding process for the roller array triboelectric nanogenerator of the present invention.

[0034] Figure 5 This is a schematic diagram of the series circuit for rectification, filtering, and voltage regulation of the present invention.

[0035] Figure 6 This is a schematic diagram of the microfluidic chip structure of the present invention.

[0036] In the diagram: 1. Base; 2-1. First support; 2-2. Second support; 3-1. First shaft; 3-2. Second shaft; 4-1. First bearing; 4-2. Second bearing; 5. Friction left roller; 6. Friction left channel; 7. Friction right roller; 8. Friction right channel; 9. Microchannel layer; 10. Sample inlet; 11. First outlet; 12. Sheath fluid inlet; 13. Second outlet; 14. Barrier array; 15. Main channel; 16. PET film; 17. PETF film; 18. Copper foil. Detailed Implementation

[0037] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0040] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0041] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0042] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0043] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0044] like Figure 1 As shown, this invention provides a microparticle manipulation device combining dielectrophoresis and a roller array triboelectric nanogenerator, comprising: a roller array triboelectric nanogenerator, a rectifier-filter-regulator circuit, and a microfluidic chip, wherein:

[0045] The roller array triboelectric nanogenerator is used to convert ocean energy into electrical energy. The output terminal of the roller array triboelectric nanogenerator is connected to the input terminal of the rectifier, filter, and voltage regulator circuit, serving as the energy source for the chip.

[0046] The rectifier-filter-regulator circuit is used to control the AC-to-DC conversion of the voltage of each friction unit in the roller array triboelectric nanogenerator, and to control the series merging of each voltage. The output of the rectifier-filter-regulator circuit is connected to the input of the microfluidic chip.

[0047] The microfluidic chip is used to sort microplastic particles in the ocean, and the input end of the microfluidic chip is connected to the output end of the rectifier, filter and voltage regulator circuit.

[0048] In specific implementation, as a preferred embodiment of the present invention, please refer to [reference needed]. Figure 1 The roller array triboelectric nanogenerator is made of acrylic sheet and includes a base 1, a balance bracket 2, a balance shaft 3, a bearing 4, and multiple friction units, wherein:

[0049] The balance support includes a first support 2-1 and a second support 2-2, with the first support 2-1 and the second support 2-2 respectively disposed on both sides of the base 1;

[0050] The bearing includes a first bearing 4-1 and a second bearing 4-2. The first bearing 4-1 is located on the upper end of the first bracket 2-1, and the second bearing 4-2 is located on the upper end of the second bracket 2-2.

[0051] The balance shaft includes a first shaft 3-1 and a second shaft 3-2, which are cross-connected; the two ends of the first shaft 3-1 are movably connected to the first bearing 4-1 and the second bearing 4-2, respectively; the two ends of the second shaft 3-2 are connected to friction units, respectively.

[0052] The friction unit includes multiple left friction units and multiple right friction units. Each left friction unit includes a left friction roller 5 and a left friction channel 6, and each right friction unit includes a right friction roller 7 and a right friction channel 8. Figure 3 The diagram shown is a structural diagram of the friction unit of a roller array triboelectric nanogenerator.

[0053] In a specific implementation, as a preferred embodiment of the present invention, the diameter of the left friction roller 5 is smaller than the width of the left friction channel 6, and the diameter of the right friction roller 7 is smaller than the width of the right friction channel 8, so as to ensure that the rollers can roll freely in the channel.

[0054] In a preferred embodiment of the invention, each left friction roller 5 and each right friction roller 7 has an independent layer adhered to its surface. This independent layer is a first friction material with the same size and shape as the roller. The bottom of each left friction channel 6 and each right friction channel 8 is respectively adhered with a conductive electrode and a second friction material. The conductive electrodes are in a crossed shape, with the two sets of electrodes intersecting but not contacting each other. Figure 4 The diagram shows the bonding process of the friction material in a roller array triboelectric nanogenerator. The bonding steps are as follows: interdigitated electrodes, laser-cut to correspond to the roller dimensions, are bonded to an acrylic plate in two sets; next, a PTFE film is bonded onto the copper foil interdigitated electrodes as the friction material. The other friction material is a PET film, which is then fully bonded according to the roller dimensions.

[0055] In specific implementation, as a preferred embodiment of the present invention, such as Figure 2As shown, the first friction material is a PET film 16, the second friction material is a PTFE film 17, and the conductive electrode is a copper foil 18. Its working principle is as follows: When the PET film 16 and PTFE film 17 come into contact, charge transfer occurs; the PET film 16 carries a positive charge, and the PTFE film 17 carries a negative charge. When the PET film 16 moves to the right, the positive charge in the circuit flows towards the first electrode, and the negative charge flows towards the second electrode. When the PET film 16 coincides with the right electrode, all the positive charge flows towards the first electrode, and the negative charge flows towards the second electrode. When the PET film 16 moves to the left, the charge movement is exactly in the opposite direction to the previous movement.

[0056] In specific implementation, as a preferred embodiment of the present invention, such as Figure 5 As shown, the rectifier-filter-regulator circuit includes a PCB base plate, a bridge rectifier diode, a Zener diode, and a high-voltage capacitor mounted on the PCB base plate. The electricity generated by friction is converted into DC by several bridge rectifier diodes, and then they are connected in series for unified filtering and voltage regulation to power the microfluidic chip.

[0057] In specific implementation, as a preferred embodiment of the present invention, such as Figure 6 As shown, the microfluidic chip includes a microchannel layer 9, a sample inlet 10, a first outlet 11, a sheath fluid inlet 12, a second outlet 13, a barrier array 14, and a main channel 15, wherein:

[0058] The sample inlet 10, the first outlet 11, the sheath fluid inlet 12, the second outlet 13, the barrier array 14, and the main channel 15 are all disposed on the microchannel layer 9; the two ports of the main channel 15 are respectively connected to the sample inlet 10 and the first outlet 11; one side wall of the main channel 15 has two channel ports respectively for connecting the sheath fluid inlet 12 and the second outlet 13; the barrier array 14 is disposed inside the main channel 15 between the two channel ports;

[0059] Dielectrophoretic sorting uses DC dielectrophoresis. A non-uniform electric field is generated in the main channel 15 through the barrier array 14. After sorting in this area, microplastic particles of different sizes will enter different outlets to achieve the screening and separation of microplastic particles. The working process is as follows:

[0060] The positive terminal of the power supply is connected to the sample solution inlet 10, and the negative terminal is connected to the first outlet 11. Due to the high-voltage regulation of the channel, a high-gradient non-uniform electric field is formed at the barrier array 14 of the main channel 15. A solution containing microplastic particles of different sizes is injected into the sample solution inlet 10 of the microfluidic chip. Sheath fluid is added at the sheath fluid inlet 12. The main function of the sheath fluid is to compress the microplastic particles in the sample solution under dielectric force in the high-gradient non-uniform electric field. Microplastic particles of different sizes can be obtained at the first outlet 11 and the second outlet 13.

[0061] In a preferred embodiment of the present invention, a cover plate is further disposed on the top of the microfluidic chip. Both the cover plate and the microchannel layer are made of PDMS material and fabricated using a photolithography casting process. In this embodiment, a method for fabricating the microfluidic chip is provided, including:

[0062] Substrate pretreatment: The substrate is cleaned with a cleaning solution to remove contaminants from the substrate surface in order to better coat the photoresist. In this invention, a silicon wafer is selected as the substrate.

[0063] Spin-coating photoresist: A layer of photoresist is spin-coated onto the pre-treated silicon wafer surface, usually using a spin coater. The thickness of the spin-coated photoresist depends on the spin speed and the viscosity of the photoresist; the corresponding spin speed for the desired thickness can be found in the photoresist's instruction manual.

[0064] Pre-baking: The purpose is to remove solvents from the photoresist, improve the developing ability of the photoresist film in the developer, improve the adhesion between the silicon wafer and the photoresist, and make the photoresist film more wear-resistant, ensuring that a full chemical reaction can take place during exposure.

[0065] Exposure: The mask is placed on the pre-baked silicon wafer and exposed using an exposure machine to copy the pattern of the mask onto the photoresist.

[0066] Development: The exposed silicon wafer is placed in the developing solution to clean it, thereby removing excess photoresist and revealing the designed pattern;

[0067] Hardening: After development, the substrate is cleaned with acetone solution and then baked to remove residual solvent and moisture for 20-25 minutes at a temperature of 150-200℃, finally obtaining the silicon wafer required for the experiment.

[0068] After mixing PDMS and curing agent in a 10:1 ratio, place the mixture in a vacuum chamber and let it stand for 30 minutes to remove air bubbles. After degassing, start pouring the PDMS mixture onto a silicon wafer wrapped in tin foil. Be careful to pour it slowly along the wall of the chamber to prevent air bubbles from forming. Then, place the cast silicon wafer in a constant temperature oven and heat it for 2-3 hours at 85°C to obtain dried and cured PDMS. At this point, remove the cured PDMS and let it cool to room temperature. Then, peel the PDMS off the silicon wafer and trim off the excess to obtain the channel layer of the microfluidic chip.

[0069] If needed, perform plasma cleaning on the channel layer and glass substrate for 45 seconds, then remove and bond them. To improve the bonding strength, place the microfluidic chip on a heating plate, press it with a weight, and heat for 1 hour. After heating, let it stand at room temperature for half an hour, and the channel will regain its hydrophilicity.

[0070] In summary, this invention is a dielectric electrophoretic sorting device that combines a triboelectric nanogenerator with a microfluidic chip. In the triboelectric nanogenerator section, a roller array-type triboelectric nanogenerator based on an independent layer mode is proposed. Driven by seawater, the roller array inside the device rolls violently, making frictional contact with the electrode area at the bottom of the channel, effectively converting ocean energy into electrical energy. Each triboelectric unit is then rectified and filtered using a bridge circuit. The rectified and filtered voltage is direct current (DC). Connecting these DC currents in series effectively powers the microfluidic chip, enabling it to sort microplastic particles in the ocean. This device combines triboelectric nanogenerator technology with microfluidic technology, achieving efficient energy conversion and offering excellent portability and safety. This invention provides a novel method for blue energy harvesting and powering microfluidic chips, which is of great significance for the sorting of marine microplastics.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A microparticle manipulation device combining dielectrophoresis and a roller array triboelectric nanogenerator, characterized in that, include: The components include a roller array triboelectric nanogenerator, a rectifier, filter, and voltage regulator circuit, and a microfluidic chip. The roller array triboelectric nanogenerator is used to convert ocean energy into electrical energy. The output end of the roller array triboelectric nanogenerator is connected to the input end of the rectifier, filter and voltage regulator circuit, which is the energy source of the microfluidic chip. The roller array triboelectric nanogenerator is made of acrylic sheet and includes a base (1), a balance bracket (2), a balance shaft (3), a bearing (4), and multiple friction units, wherein: The balancing support includes a first support (2-1) and a second support (2-2), which are respectively disposed on both sides of the base (1); The bearing includes a first bearing (4-1) and a second bearing (4-2). The first bearing (4-1) is located on the upper end of the first bracket (2-1), and the second bearing (4-2) is located on the upper end of the second bracket (2-2). The balance shaft includes a first shaft (3-1) and a second shaft (3-2), which are cross-connected. The two ends of the first shaft (3-1) are movably connected to the first bearing (4-1) and the second bearing (4-2), respectively. The two ends of the second shaft (3-2) are connected to friction units. The friction unit includes multiple left friction units and multiple right friction units. Each left friction unit includes a left friction roller (5) and a left friction channel (6). Each right friction unit includes a right friction roller (7) and a right friction channel (8). The diameter of the left friction roller (5) is smaller than the width of the left friction channel (6), and the diameter of the right friction roller (7) is smaller than the width of the right friction channel (8), ensuring that the roller can roll freely in the channel. Each left friction roller (5) and each right friction roller (7) has an independent layer attached to its surface. The independent layer is a first friction material with the same size and shape as the roller. Each left friction channel (6) and each right friction channel (8) has a conductive electrode and a second friction material attached to its bottom. The conductive electrode is a cross-shaped electrode. The two sets of electrodes cross each other but do not contact each other. The rectifier-filter-regulator circuit is used to control the AC-to-DC conversion of the voltage of each friction unit in the roller array triboelectric nanogenerator, and to control the series merging of each voltage. The output of the rectifier-filter-regulator circuit is connected to the input of the microfluidic chip. The microfluidic chip is used to sort microplastic particles in the ocean. The input end of the microfluidic chip is connected to the output end of the rectifier, filter and voltage regulator circuit. The microfluidic chip includes a microchannel layer (9), a sample inlet (10), a first outlet (11), a sheath fluid inlet (12), a second outlet (13), a barrier array (14), and a main channel (15), wherein: The sample inlet (10), the first outlet (11), the sheath fluid inlet (12), the second outlet (13), the barrier array (14), and the main channel (15) are all disposed on the microchannel layer (9); the two ports of the main channel (15) are connected to the sample inlet (10) and the first outlet (11) respectively; two channel ports are opened on one side wall of the main channel (15) for connecting the sheath fluid inlet (12) and the second outlet (13) respectively; a barrier array (14) is disposed inside the main channel (15) between the two channel ports. Dielectric electrophoresis sorting uses DC dielectric electrophoresis. A non-uniform electric field is generated in the main channel (15) through a barrier array (14). After sorting in the non-uniform electric field region, microplastic particles of different sizes will enter different outlets to achieve the screening and separation of microplastic particles. The working process is as follows: The positive terminal of the power supply is connected to the sample inlet (10), and the negative terminal of the power supply is connected to the first outlet (11). As the channel is under high voltage regulation, a high gradient non-uniform electric field is formed at the barrier array (14) of the main channel (15). The sample inlet (10) of the microfluidic chip is injected with a solution containing microplastic particles of different sizes. Sheath fluid is added at the sheath fluid inlet (12). The role of the sheath fluid is to squeeze the microplastic particles in the sample solution to be subjected to dielectric force in the high gradient non-uniform electric field. Microplastic particles of different sizes are obtained at the first outlet (11) and the second outlet (13).

2. The microparticle manipulation device combining dielectrophoresis and roller array triboelectric nanogenerator according to claim 1, characterized in that, The first friction material is a PET film (16), the second friction material is a PTFE film (17), and the conductive electrode is a copper foil (18).

3. The microparticle manipulation device combining dielectrophoresis and roller array triboelectric nanogenerator according to claim 1, characterized in that, The rectifier-filter-regulator circuit includes a PCB base plate, bridge rectifier diodes, Zener diodes, and high-voltage capacitors mounted on the PCB base plate. The electricity generated by friction is converted into DC by several bridge rectifier diodes, and then connected in series for unified filtering and voltage regulation to power the microfluidic chip.

4. The microparticle manipulation device combining dielectrophoresis and roller array triboelectric nanogenerator according to claim 1, characterized in that, The top of the microfluidic chip is also provided with a cover plate. Both the cover plate and the microchannel layer (9) are made of PDMS material and are fabricated using photolithography casting process.

Images