Microstructure for microdroplet transport and methods of use and manufacture thereof

Abstract

The application provides a microstructure for micro-droplet transportation and a method for using and manufacturing the same, wherein the microstructure for micro-droplet transportation comprises a magnetic microstructure and a magnet, the magnetic microstructure comprises a magnetic plate and a plurality of magnetic columns arranged uniformly in a ring shape on the upper surface of the magnetic plate, each of the magnetic columns is a bendable magnetic column, and a micro-droplet transportation space is formed by the magnetic columns; the magnet is detachably connected to the lower surface of the magnetic plate by magnetic attraction; when the magnet is connected to the magnetic plate by magnetic attraction, the magnet is arranged at a position on the magnetic plate corresponding to the micro-droplet transportation space, so that each of the magnetic columns can bend towards the center of the micro-droplet transportation space. The application can realize simple and convenient operation of single micro-droplet transportation, and the transportation process is safe and reliable.

Description

Technical Field

[0001] This invention relates to the field of microdroplet transport technology, and in particular to a microstructure for microdroplet transport, its usage method, and its manufacturing method. Background Technology

[0002] Microfluidic control technology, due to its ability to regulate through interfacial media, offers novel methods for applications such as cell sorting and manipulation in biomedicine, green and efficient self-lubrication or heat dissipation in electromechanical devices, surgical trauma, and interfacial force control in wearable devices. The unique advantages of microfluidic control technology have attracted widespread attention from scholars in various fields, including biosensing, bioanalysis, catalysis, medicine, chemistry, and materials synthesis.

[0003] Currently, the immobilization and transport of microfluidics are challenging aspects of microfluidic control technology. How to immobilize microfluidics on the surface of microchannels has become a key issue for heterogeneous microfluidic chips. In existing technologies, although microfluidics can be directly adsorbed onto the surface of hydrophobic microchannels through hydrophobic interactions, this may cause changes in the microfluidic phase structure.

[0004] Therefore, designing and manufacturing a microstructure that enables three-dimensional transport of microdroplets, simplifying the operation of droplet transport and ensuring the safety and reliability of the transport process, is a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] The primary objective of this invention is to provide a microstructure for microdroplet transport that simplifies the operation of microdroplet transport and ensures a safe and reliable transport process.

[0006] A second objective of this invention is to provide a method of using a microstructure for microdroplet transport.

[0007] A third objective of this invention is to provide a method for manufacturing microstructures for microdroplet transport.

[0008] This invention provides a microstructure for microdroplet transport, comprising:

[0009] A magnetic microstructure includes a magnetic plate and a plurality of magnetic pillars disposed on the upper surface of the magnetic plate. The plurality of magnetic pillars are arranged uniformly in a ring, and each magnetic pillar is a flexible magnetic pillar. The magnetic pillars enclose a microdroplet transport space.

[0010] The magnet is detachably connected to the lower surface of the magnetic plate by magnetic attraction. When the magnet is magnetically connected to the magnetic plate, the magnet is positioned on the magnetic plate at a position corresponding to the microdroplet transport space, so that each magnetic column can bend toward the center of the microdroplet transport space.

[0011] According to the present invention, a microstructure for microdroplet transport is provided, wherein the cross-section of the magnetic column gradually increases from the top to the bottom, and the bottom end of the magnetic column is fixedly connected to the magnetic plate.

[0012] According to the present invention, a microstructure for microdroplet transport is provided, wherein the magnetic plate and each of the magnetic pillars are configured as an integrally formed structure.

[0013] According to the present invention, a microstructure for microdroplet transport is provided, wherein the magnetic microstructure is cast from a material composed of neodymium iron boron particle powder and liquid PDMS mixed in a mass ratio of 4:3.

[0014] On the other hand, the present invention provides a method for using a microstructure for microdroplet transport, specifically including the following steps:

[0015] The droplets to be transported are placed in the microdroplet transport space formed by the magnetic pillars on the magnetic plate.

[0016] A magnet is placed at the bottom of the magnetic plate at a position corresponding to the microdroplet transport space, so that the magnet is magnetically attracted and fixed to the bottom of the magnetic plate, thereby applying a magnetic field to the bottom of the magnetic plate.

[0017] Under the action of the applied magnetic field, each of the magnetic pillars on the magnetic plate bends toward the center of the microdroplet transport space to enclose the droplet to be transported.

[0018] After the magnetic plate is transferred to the designated position, it is positioned with the magnetic plate facing downwards. Then, the magnet is removed from the magnetic plate, thereby removing the magnetic field applied to the magnetic plate and restoring each of the magnetic columns to its initial state.

[0019] The droplets to be transferred fall to the designated location under the action of gravity.

[0020] On the other hand, the present invention also provides a method for manufacturing a microstructure for microdroplet transport, specifically including the following steps:

[0021] Using 3D printing technology and photosensitive resin material, a microstructure mold is printed in one step.

[0022] An indium-tin alloy with a melting point of 47°C is placed on the microstructure primary mold. The microstructure primary mold is then placed in a constant temperature chamber for treatment. The temperature of the constant temperature chamber is set to 60°C, and the chamber is evacuated. The treatment is carried out under these conditions for 30 minutes so that the molten liquid indium-tin alloy can fill the grooves and micropores of the microstructure primary mold.

[0023] After the constant temperature chamber has finished processing and cooled down, the solidified indium tin alloy is carefully peeled off from the microstructure primary mold to obtain the metal model;

[0024] The metal model is imprinted on solid industrial clay, and then the metal model is carefully peeled off from the industrial clay to obtain a microstructured secondary mold made of the industrial clay.

[0025] Neodymium iron boron granules and liquid PDMS were mixed at a mass ratio of 4:3 and stirred carefully to obtain a mixed solution. The mixed solution was then cast onto the microstructure secondary mold and degassed.

[0026] A square neodymium iron boron permanent magnet is placed under the microstructure secondary mold for about 2 minutes to allow the neodymium iron boron particles in the mixed solution to assemble into a chain structure.

[0027] After the mixed solution on the secondary mold of the microstructure has solidified, carefully peel off the secondary mold of the microstructure to demold and obtain the magnetic microstructure;

[0028] The magnetic microstructure is processed to obtain a microstructure for microdroplet transport.

[0029] According to the present invention, a method for manufacturing a microstructure for microdroplet transport is provided, wherein the primary mold for the microstructure is a rectangular mold, the upper surface of the rectangular mold is provided with a rectangular groove, and a plurality of microholes are provided at the center of the rectangular groove, the plurality of microholes being uniformly arranged in a ring; wherein the outer diameter D of the ring formed by the plurality of microholes is 3mm, the diameter d of each microhole is 0.5mm, and the depth t of each microhole is 2mm;

[0030] Then, the microstructure primary mold is placed in an ultrasonic cleaner for 10 minutes to clean the surface impurities of the microstructure primary mold.

[0031] According to the present invention, a method for manufacturing microstructures for microdroplet transport is provided, wherein the industrial sludge comprises the following raw materials in the following mass fractions: 10% quicklime, 10% hemihydrate gypsum, 2% methylcellulose, 10% calcium dioxide, and 68% raw soil, shale, clay, or coal gangue.

[0032] According to the present invention, a method for manufacturing a microstructure for microdroplet transport is provided, wherein the particle diameter of the neodymium iron boron powder is 3~5 μm; the square neodymium iron boron permanent magnet has a length of 20 mm, a width of 20 mm, a height of 10 mm, and a magnetic induction intensity of 1.28 T.

[0033] According to a method for manufacturing a microstructure for microdroplet transport provided by the present invention, the step of processing the magnetic microstructure to obtain the microstructure for microdroplet transport specifically includes:

[0034] The magnetic microstructure was first placed in deionized water for 10 minutes and then removed.

[0035] The magnetic microstructure was then placed in ethanol for 10 minutes and then removed.

[0036] The magnetic microstructure is then surface-treated, and a magnet is selected to magnetically engage with it, thereby obtaining a microstructure for microdroplet transport.

[0037] The microstructure for microdroplet transport provided by this invention utilizes multiple flexible magnetic pillars arranged in a ring on the upper surface of a magnetic plate to form a microdroplet transport space. Magnets are magnetically attached to the lower surface of the magnetic plate, positioned at locations corresponding to the microdroplet transport space, allowing each magnetic pillar to bend towards the center of the space. Thus, when microdroplet transport is required, the microdroplet is placed within the transport space, and the magnets are magnetically fixed to the bottom of the magnetic plate, causing each magnetic pillar to bend towards the center of the transport space, thereby enveloping the microdroplet. This enables three-dimensional transport of the microdroplet, simplifying the operation of transporting a single microdroplet. Furthermore, it prevents different types of microdroplets from contacting and reacting during transport, and avoids contact and reactions between the microdroplets and the bottom material of the microstructure on a two-dimensional plane, ensuring a safe and reliable transport process. Attached Figure Description

[0038] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific 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 from these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram illustrating the working principle of the microstructure used for microdroplet transport in an embodiment of the present invention;

[0040] Figure 2 This is a cross-sectional view of the magnetic microstructure in the microstructure used for microdroplet transport according to an embodiment of the present invention;

[0041] Figure 3 This is an isometric view of the magnetic microstructure in the microstructure used for microdroplet transport according to an embodiment of the present invention;

[0042] Figures 4 to 7 This is a flowchart illustrating the method of using the microstructure for microdroplet transport according to an embodiment of the present invention;

[0043] Figures 8 to 13 This is a schematic diagram illustrating the process of manufacturing a microstructure for microdroplet transport according to an embodiment of the present invention.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1. Magnet; 2. Magnetic plate; 3. Magnetic column; 4. Microdroplet transport space; 5. Droplet to be transported; 6. Primary mold of microstructure; 61. Groove; 62. Micropore; 7. Indium tin alloy; 8. Metal model; 9. Industrial sludge; 10. Secondary mold of microstructure; 11. Magnetic microstructure. Detailed Implementation

[0046] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0047] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and 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. Therefore, they should not be construed as limiting this invention.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0049] like Figures 1 to 3 As shown, the microstructure for microdroplet transport in this embodiment of the invention includes a magnetic microstructure and a magnet 1. The magnetic microstructure includes a magnetic plate 2 and a plurality of magnetic pillars 3 disposed on the upper surface of the magnetic plate 2. The plurality of magnetic pillars 3 are uniformly arranged in a ring, and each magnetic pillar 3 is a flexible magnetic pillar. The magnetic pillars 3 enclose each other to form a microdroplet transport space 4.

[0050] The magnet 1 is detachably connected to the lower surface of the magnetic plate 2 via magnetic attraction. When the magnet 1 is magnetically connected to the magnetic plate 2, the magnet 1 is positioned on the magnetic plate 2 at a location corresponding to the microdroplet transport space 4, so that each magnetic column 3 can bend toward the center of the microdroplet transport space 4.

[0051] When microdroplet transport is required, the microdroplet to be transported is placed in the microdroplet transport space 4, and then the magnet 1 is magnetically fixed to the bottom of the magnetic plate 2, so that each magnetic column 3 bends towards the center of the microdroplet transport space 4, thereby wrapping the droplet to be transported, thus realizing the three-dimensional transport of the microdroplet.

[0052] Therefore, the microstructure for microdroplet transport in this embodiment of the invention can selectively transfer and fix microdroplets, simplifying the operation of microdroplet transport, diversifying its functions, reducing operating costs, and enabling three-dimensional transport of a single microdroplet while ensuring easy operation. It can also transport across gaps, and during the transport process, it can prevent different types of microdroplets from coming into contact and reacting with each other, and it can also prevent microdroplets from coming into contact with the bottom material (i.e., the magnetic plate) of the microstructure on the two-dimensional plane and reacting with each other. The transport process is safe and reliable.

[0053] The microstructures for microdroplet transport in this invention can be applied to a variety of complex working conditions, meet the surface functionalization requirements in different situations, and precisely control the dynamic interaction behavior of the liquid-gas-solid interface at the microscale.

[0054] In some embodiments of the present invention, the cross-section of the magnetic column 3 gradually increases from the top to the bottom, and the bottom end of the magnetic column 3 is fixedly connected to the magnetic plate 2. That is, each magnetic column 3 is a conical column with a smaller top and a larger bottom, which facilitates bending under the action of a magnetic field to encapsulate microdroplets.

[0055] The magnetic plate 2 and each magnetic column 3 are designed as an integral molded structure, that is, the magnetic microstructure is an integral molded structure.

[0056] Depending on the actual usage requirements, the magnetic plate 2 can be set as a rectangle or a circle, or other shapes.

[0057] The magnetic microstructure is made by casting a material composed of neodymium iron boron particle powder and liquid PDMS in a 4:3 mass ratio. In other words, the magnetic microstructure is manufactured by casting a specific mixture of materials in a specific mold.

[0058] like Figures 4 to 7 As shown, this embodiment of the invention also provides a method for using a microstructure for microdroplet transport. This method uses the microstructure for microdroplet transport described in the above embodiment and specifically includes the following steps:

[0059] like Figure 4 As shown, droplets 5 to be transferred are placed in the microdroplet transfer space formed by the magnetic pillars 3 on the magnetic plate 2.

[0060] like Figure 5 As shown, a magnet 1 is placed at the bottom of the magnetic plate 2 at the position corresponding to the microdroplet transport space, so that the magnet 1 is magnetically attracted and fixed to the bottom of the magnetic plate 2, thereby applying a magnetic field to the bottom of the magnetic plate 2. Under the action of the applied magnetic field, each magnetic column 3 on the magnetic plate 2 bends towards the center of the microdroplet transport space to wrap the droplet 5 to be transported.

[0061] like Figure 6 As shown, after the magnetic plate 2 is transferred to the designated position, it is set facing downwards.

[0062] like Figure 7 As shown, the magnet is removed from the magnetic plate 2, thereby removing the magnetic field applied to the magnetic plate 2 and restoring each magnetic column 3 to its initial state. Then, the droplet 5 to be transferred falls to the designated position under the action of gravity.

[0063] like Figures 8 to 13 As shown in the figure, this invention also provides a method for manufacturing a microstructure for microdroplet transport as described in the above embodiments, specifically including the following steps:

[0064] Using 3D printing technology and photosensitive resin materials, shapes are printed as follows: Figure 8 The microstructure shown is a primary mold 6.

[0065] like Figure 9 As shown, an indium-tin alloy 7 with a melting point of 47°C is placed on a microstructure primary mold 6. Then, the microstructure primary mold 6 is placed in a constant temperature chamber, the temperature of which is set to 60°C, and a vacuum is drawn into the chamber. The process is carried out under these conditions for 30 minutes to allow the molten liquid indium-tin alloy to fill the grooves and micropores of the microstructure primary mold 6.

[0066] After the constant temperature chamber treatment is completed and the mixture has cooled, the solidified indium-tin alloy is carefully peeled off from the microstructure primary mold 6 to obtain the following: Figure 10 The metal model shown is 8.

[0067] The metal model 8 is imprinted onto solid industrial clay 9, such as... Figure 11 As shown.

[0068] Then, the metal model 8 was carefully peeled off from the industrial sludge 9 to obtain a sample composed of industrial sludge. Figure 12 The microstructure secondary mold 10 is shown.

[0069] Neodymium iron boron granules and liquid PDMS were mixed at a mass ratio of 4:3 and stirred carefully to obtain a mixed solution. The mixed solution was then cast onto a microstructure secondary mold 10 and degassed.

[0070] A square neodymium iron boron permanent magnet is placed below the microstructure secondary mold 10 for about 2 minutes to allow the neodymium iron boron particles in the mixed solution to assemble into a chain structure.

[0071] After the mixed solution on the secondary microstructure mold 10 has solidified, carefully peel off the secondary microstructure mold 10 to demold, obtaining the following: Figure 13 The magnetic microstructure 11 shown.

[0072] The magnetic microstructure 11 is processed to obtain a microstructure for microdroplet transport.

[0073] Specifically, the microstructure primary mold 6 is a rectangular mold. The upper surface of the rectangular mold is provided with a groove 61, and multiple microholes 62 are provided at the center of the groove 61. The multiple microholes 62 are evenly arranged in a ring shape.

[0074] The outer diameter D of the ring composed of multiple micro-holes 62 is 3 mm, the maximum diameter d of each micro-hole 62 is 0.5 mm, and the depth t of each micro-hole 62 is 2 mm. Therefore, the height of the micro-pillar on the metal model 8 obtained after the first demolding is the depth t of the micro-hole.

[0075] Then, the microstructure primary mold 6 needs to be placed in an ultrasonic cleaner for 10 minutes to clean the surface impurities of the microstructure primary mold 6.

[0076] Specifically, industrial sludge comprises the following raw materials by mass fraction: 10% quicklime, 10% hemihydrate gypsum, 2% methylcellulose, 10% calcium dioxide, and 68% raw soil, shale, clay, or coal gangue.

[0077] Specifically, the particle diameter of neodymium iron boron powder is 3~5 μm.

[0078] Specifically, the square NdFeB permanent magnet has a length of 20mm, a width of 20mm, a height of 10mm, and a magnetic induction intensity of 1.28T. By placing the square NdFeB permanent magnet under the microstructure secondary mold 10 for about 2 minutes, the NdFeB particles in the mixed solution can be assembled into a chain structure, thereby enhancing the magnetic field control capability of each magnetic pillar on the cured magnetic microstructure 11, allowing each magnetic pillar to bend according to the set magnetic field direction.

[0079] Specifically, the magnetic microstructure 11 is processed to obtain a microstructure for microdroplet transport, including:

[0080] First, immerse the magnetic microstructure 11 in deionized water for 10 minutes and then remove it.

[0081] Then, the magnetic microstructure 11 was placed in ethanol for 10 minutes and then removed.

[0082] The magnetic microstructure 11 is then surface-treated, and a magnet is selected to magnetically engage with it, thereby obtaining a microstructure for microdroplet transport.

[0083] That is, the magnetic plate and each magnetic pillar of the magnetic microstructure 11 should be hydrophobic. Therefore, hydrophobic treatment is required after fabrication to prevent the droplets from falling freely when the magnetic field is removed because the adsorption force on the surface of the magnetic pillar and magnetic plate is greater than the weight of the droplets.

[0084] Specifically, in this embodiment, two demolding operations were used in the process of fabricating the magnetic microstructure 11. The reason for the two demolding operations is that the photosensitive resin material will react chemically with the liquid PDMS, causing the liquid PDMS to not be completely solidified. The solid industrial sludge 9 will not react with the PDMS material used to fabricate the magnetic microstructure 11, so a second demolding is used.

[0085] The method for manufacturing microstructures for microdroplet transport according to embodiments of the present invention is simple in process and short in time. It can be adjusted according to different parameters and dimensions. It can be completed with only simple preparation steps, relatively inexpensive equipment and environmentally friendly materials, avoiding the investment of expensive equipment, templates and consumables, thereby reducing the manufacturing cost of microstructures for microdroplet transport.

[0086] 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 microstructure for microdroplet transport, characterized by, The application relates to a magnetic microstructure. The magnetic microstructure comprises a magnetic plate and a plurality of magnetic columns arranged on the upper surface of the magnetic plate, the plurality of magnetic columns are arranged in a ring shape and uniformly distributed, and each of the magnetic columns is a bendable magnetic column, and a micro-droplet transfer space is formed among the magnetic columns. A magnet is detachably connected to the lower surface of the magnetic plate by magnetic attraction, and when the magnet is connected to the magnetic plate by magnetic attraction, the magnet is arranged at a position on the magnetic plate corresponding to the micro-droplet transfer space, so that each of the magnetic columns can bend towards the center of the micro-droplet transfer space.

2. The microstructure for microdroplet transport according to claim 1, wherein, The cross section of the magnetic column gradually increases from the upper end to the lower end, and the lower end of the magnetic column is fixedly connected to the magnetic plate.

3. The microstructure for microdroplet transport according to claim 1, wherein, The magnetic plate and each of the magnetic columns are arranged in an integrated structure.

4. The microstructure for microdroplet transport according to claim 1, wherein, The magnetic microstructure is cast from a material mixed by neodymium iron boron particle powder and liquid PDMS according to a mass ratio of 4:

3.

5. A method of using a microstructure for microdroplet transport as claimed in any one of claims 1 to 4, wherein, The application further discloses a method for transferring a liquid droplet by using the magnetic microstructure. The application further discloses a method for manufacturing the magnetic microstructure. The application further discloses a method for manufacturing the magnetic microstructure. The application further discloses a method for manufacturing the magnetic microstructure. The application further discloses a method for manufacturing the magnetic microstructure. The application further discloses a method for manufacturing the magnetic microstructure.

6. A method of fabricating a microstructure for microdroplet transport as claimed in any one of claims 1 to 4, wherein, The application further discloses a method for manufacturing the magnetic microstructure. The application further discloses a method for manufacturing the magnetic microstructure. The application further discloses a method for manufacturing the magnetic microstructure. The application further discloses a method for manufacturing the magnetic microstructure. The application further discloses a method for manufacturing the magnetic microstructure. The application further discloses a method for manufacturing the magnetic microstructure. The application further discloses a method for manufacturing the magnetic microstructure. The application further discloses a method for manufacturing the magnetic microstructure. The application further discloses a method for manufacturing the magnetic microstructure. 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7. The method of claim 6, wherein the microstructure is fabricated by a method comprising: The microstructure one-time mold is a rectangular mold, the upper surface of the rectangular mold is provided with a rectangular groove, a plurality of micro-holes are arranged at the center position of the rectangular groove, and the plurality of micro-holes are uniformly arranged in a circular ring shape; wherein the outer diameter D of the circular ring formed by the plurality of micro-holes is 3mm, the diameter d of each micro-hole is 0.5mm, and the depth t of each micro-hole is 2mm. Then the microstructure one-time mold is placed in an ultrasonic cleaner for cleaning treatment for 10min, and the surface impurities of the microstructure one-time mold are cleaned.

8. The method of claim 6, wherein the microstructure is fabricated by a method comprising: The industrial oil sludge comprises the following raw materials by mass fraction: 10% of quicklime, 10% of hemihydrate gypsum, 2% of methyl cellulose, 10% of calcium dioxide, and 68% of raw soil or shale or clay or coal gangue.

9. The method of claim 6, wherein the microstructure is fabricated by a method comprising: The particle diameter of the neodymium-iron-boron particle powder is 3-5um; the length of the square neodymium-iron-boron permanent magnet is 20mm, the width is 20mm, the height is 10mm, and the magnetic induction intensity is 1.28T.

10. The method of claim 6, wherein the microstructure is fabricated by a method comprising: The magnetic microstructure is processed to obtain a microstructure for microdroplet transportation, specifically including: First, the magnetic microstructure is placed in deionized water for 10min and then taken out; Then the magnetic microstructure is placed in ethanol for 10min and then taken out; Then the magnetic microstructure is surface treated, and then a magnet is selected for magnetic attraction with the magnetic microstructure, so as to obtain a microstructure for microdroplet transportation.

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