阅读说明：本技术 液滴转移用微柱表面、微柱表面制备方法及液滴转移方法 (Microcolumn surface for droplet transfer, method for producing microcolumn surface, and droplet transfer method ) 是由 陈华伟 靖雪山 于 2021-09-07 设计创作，主要内容包括：本发明公开一种液滴转移用微柱表面,基底表面设有多个弹性微柱,各弹性微柱之间存在间隙,多个弹性微柱能够抓取液滴并在外加磁场作用下能够产生弹性变形释放液滴。在模板表面的多个微孔中采用加有磁性颗粒的可固化弹性材料浇注成形各弹性微柱,置于磁场中,在模板表面采用不含磁性颗粒的可固化弹性材料浇注成形基底；浇注材料固化后脱模,得到液滴转移用微柱表面。将各弹性微柱进行超疏水处理,得到超疏水液滴转移用微柱表面。移动磁场使超疏水弹性微柱不断变形,推动液滴水平运动。液滴转移用微柱表面倒置下移抓取液滴后移动至目标位置上方,调节磁场,释放液滴。本发明可实现液滴的可控快速转移,并且结构简单,制作方便,可转移液滴体积大。(The invention discloses a microcolumn surface for transferring liquid drops, wherein a plurality of elastic microcolumns are arranged on the surface of a substrate, gaps exist among the elastic microcolumns, and the elastic microcolumns can grab liquid drops and can generate elastic deformation to release the liquid drops under the action of an external magnetic field. Casting each elastic microcolumn by adopting a curable elastic material added with magnetic particles in a plurality of micropores on the surface of a template, placing the elastic microcolumns in a magnetic field, and casting a substrate by adopting the curable elastic material without the magnetic particles on the surface of the template; and (4) demolding after the casting material is solidified to obtain the surface of the micro-column for transferring the liquid drops. And performing super-hydrophobic treatment on each elastic microcolumn to obtain the surface of the microcolumn for transferring the super-hydrophobic liquid drops. The moving magnetic field makes the super-hydrophobic elastic microcolumn deform continuously to push the liquid drop to move horizontally. The surface of the micro-column for transferring the liquid drops is inverted, the micro-column is downwards moved to grab the liquid drops, then the micro-column moves to the position above a target position, a magnetic field is adjusted, and the liquid drops are released. The invention can realize controllable and rapid transfer of liquid drops, and has the advantages of simple structure, convenient manufacture and large volume of transferable liquid drops.)

1. A surface of a microcolumn for droplet transfer, characterized in that: the device comprises a substrate, wherein a plurality of elastic microcolumns are arranged on the surface of the substrate, gaps exist among the elastic microcolumns, and the elastic microcolumns can grab liquid drops and can generate elastic deformation to release the liquid drops under the action of an external magnetic field.

2. A surface of a microcolumn for transferring a super-hydrophobic liquid droplet is characterized in that: the surface of the substrate is provided with a plurality of elastic microcolumns, gaps exist among the elastic microcolumns, the elastic microcolumns can generate elastic deformation under the action of an external magnetic field, and the surface of each elastic microcolumn is subjected to super-hydrophobic treatment.

3. The surface of the microcolumn as set forth in claim 1 or 2, wherein: the elastic micropillars are arranged on the surface of the substrate in an array mode.

4. The surface of the microcolumn as set forth in claim 1 or 2, wherein: a plurality of magnetic particles are distributed in the elastic microcolumn.

5. The surface of the microcolumn as set forth in claim 1 or 2, wherein: the elastic microcolumn is made of polydimethylsiloxane.

6. The surface of the microcolumn as set forth in claim 4, wherein: the magnetic particles are carbonyl iron powder particles.

7. A preparation method of a surface of a microcolumn for transferring liquid drops is characterized by comprising the following steps:

s1: casting each elastic microcolumn by adopting a curable elastic material added with magnetic particles in a plurality of micropores on the surface of a template, placing the elastic microcolumns in a magnetic field, and casting a substrate by adopting the curable elastic material without the magnetic particles on the surface of the template;

s2: and (4) demolding after the casting material is solidified to obtain the surface of the micro-column for transferring the liquid drops.

8. A preparation method of a surface of a micro-column for transferring super-hydrophobic liquid drops is characterized by comprising the following steps:

s1: casting each elastic microcolumn by adopting a curable elastic material added with magnetic particles in a plurality of micropores on the surface of a template, placing the elastic microcolumns in a magnetic field, and casting a substrate by adopting the curable elastic material without the magnetic particles on the surface of the template;

s2: demolding after the casting material is solidified to obtain the surface of the microcolumn for transferring the liquid drops;

s3: and (4) performing superhydrophobic treatment on each elastic microcolumn on the surface of the microcolumn for transferring the liquid drop obtained in the step (S2) to obtain the surface of the microcolumn for transferring the superhydrophobic liquid drop.

9. A method of transferring droplets on the surface of the microcolumn for droplet transfer according to any one of claims 1, 3, 4, 5, and 6, comprising the steps of: and inverting the surface of the micro-column for transferring the liquid drop to downwards contact the liquid drop, grabbing the liquid drop on the surface of the micro-column for transferring the liquid drop through a plurality of elastic micro-columns, moving the surface of the micro-column for transferring the liquid drop to a position above a target position, and adjusting a magnetic field to release the liquid drop to the target position.

10. A droplet transfer method based on the surface of the microcolumn for transferring superhydrophobic droplets according to any one of claims 2 to 6, comprising the steps of: and placing the liquid drop on the surface of the micro-column for transferring the super-hydrophobic liquid drop, moving the magnetic field to enable the magnetic field to move from the initial position for placing the liquid drop to the target position, and under the action of the magnetic field, sequentially elastically deforming each elastic micro-column corresponding to the moving path of the magnetic field along with the movement of the magnetic field, so that the liquid drop gradually moves to the target position along with the sequentially deformed elastic micro-columns.

Technical Field

The invention relates to the technical field of droplet transfer surface structures, in particular to a micro-column surface for droplet transfer, a micro-column surface preparation method and a droplet transfer method.

Background

The liquid directional regulation and control research has important significance in the microfluidic fields of physical chemistry, biomedicine and the like. In recent years, the liquid directional regulation and control means mainly include self-structure, chemical gradient, external field control and the like, for example, the spontaneous transportation of the liquid can be realized by using a single micro-multilevel structure (CN110052299A) and a single wetting gradient surface (CN 107482953A). In addition, the combination of chemical gradient and surface structure is more favorable for the movement of the liquid drop than the single control, such as the super wetting gradient and self structure (CN202010092291.7, CN110898865A, CN111359683A) can be utilized. The liquid is directionally transported by changing the interfacial tension and the substrate structure under the action of external field control, such as the directional transport of liquid drops under the action of an electric field (CN202020842231.8, CN202010425808.X), magnetic liquid drop regulation (CN208944125U), magnetic response microarray surface directional control liquid drops (CN111292920A), solution electroosmotic flow circulation reciprocating directional motion (CN103071554A), light-induced liquid movement (CN201911260601.5) and the like.

However, the existing invention has the defects of slow speed for realizing directional liquid conveying, small transportation volume range, complex device structure, weak real-time regulation and control capability and the like.

Disclosure of Invention

The invention aims to provide a microcolumn surface for liquid drop transfer, a preparation method of the microcolumn surface and a liquid drop transfer method, which are used for solving the problems in the prior art, can realize controllable and rapid liquid drop transfer, and have the advantages of simple structure, convenience in manufacturing and large size of transferable liquid drops.

In order to achieve the purpose, the invention provides the following scheme:

the invention provides a surface of a microcolumn for transferring liquid drops, which comprises a substrate, wherein a plurality of elastic microcolumns are arranged on the surface of the substrate, gaps exist among the elastic microcolumns, and the elastic microcolumns can grab liquid drops and can generate elastic deformation to release the liquid drops under the action of an external magnetic field.

The invention also provides a surface of the micro-column for transferring the super-hydrophobic liquid drop, which comprises a substrate, wherein the surface of the substrate is provided with a plurality of elastic micro-columns, a gap is formed between every two elastic micro-columns, each elastic micro-column can generate elastic deformation under the action of an external magnetic field, and the surface of each elastic micro-column is subjected to super-hydrophobic treatment.

In the surface of the above-mentioned micro-column for droplet transfer and the surface of the micro-column for superhydrophobic droplet transfer,

preferably, a plurality of the elastic micropillar arrays are arranged on the surface of the substrate.

Preferably, a plurality of magnetic particles are distributed in the elastic microcolumn.

Preferably, the elastic microcolumn is made of polydimethylsiloxane.

Preferably, the magnetic particles are carbonyl iron powder particles.

The invention also provides a preparation method of the surface of the micro-column for transferring the liquid drops, which comprises the following steps:

s1: casting each elastic microcolumn by adopting a curable elastic material added with magnetic particles in a plurality of micropores on the surface of a template, placing the elastic microcolumns in a magnetic field, and casting a substrate by adopting the curable elastic material without the magnetic particles on the surface of the template;

s2: and (4) demolding after the casting material is solidified to obtain the surface of the micro-column for transferring the liquid drops.

The invention also provides a preparation method of the surface of the micro-column for transferring the super-hydrophobic liquid drop, which comprises the following steps:

s1: casting each elastic microcolumn by adopting a curable elastic material added with magnetic particles in a plurality of micropores on the surface of a template, placing the elastic microcolumns in a magnetic field, and casting a substrate by adopting the curable elastic material without the magnetic particles on the surface of the template;

s2: demolding after the casting material is solidified to obtain the surface of the microcolumn for transferring the liquid drops;

s3: and (4) performing superhydrophobic treatment on each elastic microcolumn on the surface of the microcolumn for transferring the liquid drop obtained in the step (S2) to obtain the surface of the microcolumn for transferring the superhydrophobic liquid drop.

The invention also provides a droplet transfer method based on the surface of the micro-column for droplet transfer, which comprises the following steps: and inverting the surface of the micro-column for transferring the liquid drop to downwards contact the liquid drop, grabbing the liquid drop on the surface of the micro-column for transferring the liquid drop through a plurality of elastic micro-columns, moving the surface of the micro-column for transferring the liquid drop to a position above a target position, and adjusting the magnetic field to release the liquid drop to the target position.

The invention also provides a liquid drop transfer method based on the surface of the micro-column for transferring the super-hydrophobic liquid drop, which comprises the following steps: and placing the liquid drop on the surface of the micro-column for transferring the super-hydrophobic liquid drop, moving the magnetic field to enable the magnetic field to move from the initial position for placing the liquid drop to the target position, and under the action of the magnetic field, sequentially elastically deforming each elastic micro-column corresponding to the moving path of the magnetic field along with the movement of the magnetic field, so that the liquid drop gradually moves to the target position along with the sequentially deformed elastic micro-columns.

Compared with the prior art, the invention has the following technical effects:

the surface of the microcolumn for transferring the liquid drop, the preparation method of the surface of the microcolumn and the liquid drop transferring method provided by the invention have the advantages that the surface of the microcolumn for transferring the liquid drop comprises the substrate and a plurality of elastic microcolumns on the surface of the substrate, and the structure is simple; during preparation, the curable elastic material added with the magnetic particles is adopted in a plurality of micropores on the surface of the template to cast each elastic micro-column, the elastic micro-column is placed in a magnetic field, then the curable elastic material without the magnetic particles is adopted on the surface of the template to cast a substrate, and the casting material is demoulded after being cured, so that the surface of the micro-column for transferring the liquid drops can be obtained, and the preparation is convenient and rapid; through a plurality of elasticity microcolumns, can snatch great volume liquid on the microcolumn surface is used in the liquid droplet transfer, realize the transfer of liquid droplet through removing the microcolumn surface for the liquid droplet transfer, after transferring to the target location, make the liquid droplet release to the target location through adjusting magnetic field, the transfer process accessible magnetic field of liquid droplet is regulated and control, and transfer speed is fast.

The surface of the micro-column for transferring the super-hydrophobic liquid drop comprises a substrate and a plurality of elastic micro-columns on the surface of the substrate, and the surface of each elastic micro-column is subjected to super-hydrophobic treatment, so that the structure is simple; during preparation, the curable elastic material added with the magnetic particles is adopted in a plurality of micropores on the surface of the template to cast and form each elastic microcolumn, the elastic microcolumn is placed in a magnetic field, then the curable elastic material without the magnetic particles is adopted on the surface of the template to cast and form a substrate, the casting material is demoulded after being cured to obtain the surface of the microcolumn for transferring the liquid drops, and the elastic microcolumns on the surface of the microcolumn for transferring the liquid drops are subjected to super-hydrophobic treatment to obtain the surface of the microcolumn for transferring the super-hydrophobic liquid drops, so that the preparation is convenient and rapid; the liquid drop with large volume can be placed on the surface of the micro-column for transferring the super-hydrophobic liquid drop, the magnetic field is moved to the target position from the initial position for placing the liquid drop by moving the magnetic field, under the action of the magnetic field, each elastic micro-column corresponding to the moving path of the magnetic field is elastically deformed along with the movement of the magnetic field in sequence, the liquid drop is gradually moved to the target position along with the elastic micro-column which is deformed in sequence, the transfer process of the liquid drop can be regulated and controlled by the magnetic field, and the transfer speed is high.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic view of the structure of the surface of a micro-column for droplet transfer according to the first embodiment;

FIG. 2 is a flow chart of a method for preparing a surface of a microcolumn for droplet transfer according to the first embodiment;

FIG. 3 is an electron microscope image of an elastic microcolumn not doped with magnetic particles;

FIG. 4 is an electron microscope image of the elastic microcolumn doped with magnetic particles according to the first embodiment;

FIG. 5 is an electron microscope photograph of the elastic microcolumn doped with magnetic particles according to the second embodiment;

FIG. 6 is a schematic diagram showing the bouncing of a droplet on the surface of a microcolumn for droplet transfer in the first embodiment;

FIG. 7 is a diagram illustrating the bouncing of a droplet on the surface of a micro-column for transferring a superhydrophobic droplet in example two;

FIG. 8 is a schematic view of transferring a droplet in a horizontal direction using the surface of the micro-column for transferring a superhydrophobic droplet in example two;

FIG. 9 is a graph showing the relationship between the magnetic field movement velocity and the droplet movement velocity when the droplet is transferred in the horizontal direction by using the surface of the micro-column for transferring superhydrophobic droplets in example two;

FIG. 10 is a photo-optic diagram of the surface of the micro-column for droplet transfer in the first embodiment for gripping and releasing droplets of different volumes by adhesion;

FIG. 11 is a schematic view of transferring micro-droplets of different colors into corresponding channels by using the surface of the micro-column for transferring super-hydrophobic droplets in example two;

FIG. 12 is a schematic view showing the use of the microcolumn for droplet transfer in the first embodiment to grab NaOH solution and release it with CuSO₄Schematic representation of solution reaction;

in the figure: 100-surface of microcolumn for transferring liquid drop, 1-substrate, 2-elastic microcolumn, 3-template, 4-steel needle and 5-rubidium-iron-boron magnet.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention aims to provide a microcolumn surface for liquid drop transfer, a preparation method of the microcolumn surface and a liquid drop transfer method, which are used for solving the problems in the prior art, can realize controllable and rapid liquid drop transfer, and have the advantages of simple structure, convenience in manufacturing and large size of transferable liquid drops.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Example one

As shown in fig. 1, the present embodiment provides a surface 100 of a micro-column for transferring a liquid droplet, which includes a substrate 1, a plurality of elastic micro-columns 2 are disposed on the surface of the substrate 1, a gap exists between each elastic micro-column 2, and the plurality of elastic micro-columns 2 can grab a liquid droplet and can generate elastic deformation under the action of an applied magnetic field to release the liquid droplet.

In this embodiment, the plurality of elastic microcolumns 2 are disposed on the surface of the substrate 1, the structure is simple, the manufacturing is convenient, the surface of each elastic microcolumn 2 is not subjected to super-hydrophobic treatment, a large volume of liquid can be captured on the surface 100 of the microcolumn for droplet transfer through the plurality of elastic microcolumns 2, the transfer of droplets is realized by moving the surface 100 of the microcolumn for droplet transfer, after the droplets are transferred to the upper side of a target position, each elastic microcolumn 2 capturing the droplets is deformed by adjusting a magnetic field, the surface adhesion force of each elastic microcolumn is reduced, the droplets are released to the target position, the transfer process of the droplets can be regulated and controlled through the magnetic field, and the transfer speed is high.

In this implementation, a plurality of elasticity microcolumns 2 array are arranged on basement 1 surface, and wherein, a plurality of elasticity microcolumns 2 are the setting of rectangle array, and it is more convenient to make, and is more stable when shifting the liquid drop.

In this embodiment, a plurality of magnetic particles are distributed in the elastic microcolumn 2, and the plurality of magnetic particles are uniformly distributed in the elastic microcolumn 2, so that the elastic microcolumn 2 can be elastically deformed by the magnetic particles under the action of a magnetic field, and the elastic microcolumn 2 can be immediately restored to a vertical state without the action of the magnetic field. FIG. 4 shows an electron microscope image of an elastic microcolumn doped with magnetic particles. FIG. 3 is an electron microscope image of an elastic microcolumn not doped with magnetic particles.

In this embodiment, the elastic micro-column 2 is made of polydimethylsiloxane, but is not limited to polydimethylsiloxane (abbreviated as PDMS), and other elastic materials may be selected for the fabrication.

In this embodiment, the magnetic particles are carbonyl iron powder particles, and other magnetic particles may be selected.

As shown in fig. 2, the above-described method for preparing the surface 100 of the micro-column for droplet transfer includes the steps of:

s1: adopting curable elastic material added with magnetic particles to cast and form each elastic microcolumn 2 in a plurality of micropores on the surface of a template 3, placing the elastic microcolumns in a magnetic field, and adopting curable elastic material without magnetic particles to cast and form a substrate 1 on the surface of the template 3;

s2: and (3) demolding after the casting material is solidified to obtain the surface 100 of the micro-column for transferring the liquid drops.

Wherein, the template 3 can be made of a polytetrafluoroethylene Plate (PTFE), a steel needle 4 with the diameter of 250 μm is fixed on a spindle of a dispenser, the dispenser drives the steel needle to perform point-by-point hole making on the polytetrafluoroethylene plate to obtain a plurality of micropores on the surface of the template 3, the prepared micropores are conical holes, the depth of the conical holes is between 1 and 3mm, the plurality of conical holes are arranged in a rectangular array, the width of the conical hole array is preferably 20mm, the length of the conical hole array is preferably 20mm, the distance d between the conical holes is 0.75 to 1.5mm, two types of Polydimethylsiloxane (PDMS) with different viscosities are mixed according to the mass ratio of 4:1 (the mass ratio of a prepolymer of PDMS1 to a curing agent is 10:1, the mass ratio of a prepolymer of PDMS2 to a curing agent is 1:1), the mixture is uniformly mixed with carbonyl iron powder particles with the average particle size of 3 to 5 μm according to the mass ratio of 2:1, and after vacuum pumping treatment, pouring the mixture on a polytetrafluoroethylene plate with a taper hole array, placing the polytetrafluoroethylene plate on a rubidium-iron-boron magnet 5 with the length multiplied by the width multiplied by the height multiplied by 50mm multiplied by 20mm for 5-15 seconds, then vacuumizing for 60-120min again, scraping the redundant mixed solution on the surface layer, and continuously pouring the mixture of PDMS1 prepolymer and curing agent (the mass ratio is 10:1) on the surface layer; and then, placing the polytetrafluoroethylene plate in a constant temperature oven to be cured for 4-6 hours at the temperature of 80 ℃ to ensure that PDMS is fully cured, then, taking out the template 3, placing the template in a refrigerator at the temperature of-50 ℃, freezing for 10 minutes, taking out the template, and performing demolding treatment when the template 3 is not completely restored to the normal temperature, thus obtaining the surface 100 of the micro-column for transferring the liquid drops. The preparation process of the surface 100 of the micro-column for droplet transfer is simple and convenient, the used materials are green and pollution-free, and the soft elastic material is prepared by utilizing two different PDMS materials and adjusting various references, so that the structure of the elastic micro-column 2 can be greatly deformed under the action of a magnetic field to quickly respond to the change of the magnetic field.

The droplet transfer method based on the above-described microcolumn surface 100 for droplet transfer includes the steps of: the surface 100 of the microcolumn for droplet transfer is inverted and moved down to contact the droplet, the droplet is caught on the surface 100 of the microcolumn for droplet transfer, the surface 100 of the microcolumn for droplet transfer is moved above the target position, the magnetic field is adjusted, and the droplet is released to the target position. The transfer process of the liquid drops can be regulated and controlled through a magnetic field, and the transfer speed is high. When the liquid drop is grabbed, the liquid drop is grabbed by contacting the liquid drop through the plurality of elastic microcolumns 2, and after the liquid drop is moved to the position above a target position, each elastic microcolumn 2 for grabbing the liquid drop is deformed and bent under the action of a magnetic field, so that the surface adhesion force of each elastic microcolumn is reduced, and the liquid drop is released. Fig. 10 is a photo-optic diagram showing the surface of a micro-column for droplet transfer without superhydrophobic treatment grasping and releasing droplets of different volumes by adhesion. FIG. 12 shows that the surface of a micro-column for transferring liquid drops without super-hydrophobic treatment grabs NaOH solution and releases the NaOH solution together with CuSO₄Schematic representation of the solution reaction.

Example two

This example provides a surface of a micro-column for transferring a superhydrophobic droplet, which is different from the surface 100 of the micro-column for transferring a droplet in the first example in that the surface of each elastic micro-column 2 is superhydrophobic. FIG. 5 shows an electron microscope image of an elastic microcolumn doped with magnetic particles in the surface of a microcolumn for transferring superhydrophobic droplets. Fig. 7 is a schematic diagram of the bounce of the liquid droplet on the surface of the micro-column for transferring the superhydrophobic liquid droplet, fig. 6 is a schematic diagram of the bounce of the liquid droplet on the surface of the micro-column for transferring the liquid droplet, and it can be seen from fig. 6 and 7 that the liquid droplet generates the bounce effect on the surface of the micro-column for transferring the superhydrophobic liquid droplet, and the bounce effect is not generated on the surface of the micro-column for transferring the liquid droplet without the superhydrophobic treatment.

The method for manufacturing the surface of the superhydrophobic droplet transfer microcolumn described above is different from the method for manufacturing the surface of the droplet transfer microcolumn 100 in the first embodiment in that the method further includes step S3: the respective elastic microcolumns 2 on the droplet transfer microcolumn surface 100 obtained in S2 were subjected to superhydrophobic treatment, and a superhydrophobic droplet transfer microcolumn surface was obtained.

Wherein, after the surface 100 of the micro-column for droplet transfer is obtained in the step S2, the surface of each elastic micro-column 2 in the surface 100 of the micro-column for droplet transfer is placed on the super-hydrophobic SiO₂N-hexane Solution (SiO)₂0.01g to 20g of normal hexane), carrying out super-hydrophobic treatment for 5-15 minutes, taking out, and drying at room temperature to obtain the surface of the micro-column for transferring super-hydrophobic liquid drops, wherein the preparation process is simple and convenient.

The droplet transfer method based on the surface of the micro-column for transferring the super-hydrophobic droplet comprises the following steps:

the liquid drop is placed on the surface of the micro-column for transferring the super-hydrophobic liquid drop, the magnetic field is moved to enable the magnetic field to move from the initial position where the liquid drop is placed to the target position, under the action of the magnetic field, each elastic micro-column corresponding to the moving path of the magnetic field is elastically deformed along with the movement of the magnetic field in sequence, and the liquid drop is enabled to gradually move to the target position along with the elastic micro-columns which are deformed in sequence. Fig. 8 is a schematic diagram of transferring droplets in a horizontal direction by using the surfaces of the micro-pillars for transferring superhydrophobic droplets, in which the left row is a physical diagram and the right row is a schematic structural diagram corresponding to each physical diagram. The magnet is arranged below the surface of the micro-column for transferring the super-hydrophobic liquid drop and corresponds to the position of the liquid drop, the elastic micro-column corresponding to the position of the magnetic field can be bent and deformed, the magnet is moved, the elastic micro-column continuously generates bending deformation along with the movement of the magnet, and the bent and deformed elastic micro-column pushes the liquid drop and the magnet to move in the same direction so as to transfer the liquid drop. FIG. 9 is a graph showing the relationship between the moving speed of the magnetic field and the moving speed of the liquid droplet when the liquid droplet is transferred in the horizontal direction by using the surface of the micro-column for transferring a superhydrophobic liquid droplet. Fig. 11 is a schematic diagram illustrating the transfer of micro-droplets of different colors into corresponding channels by using the surfaces of micro-pillars for super-hydrophobic droplet transfer, wherein M represents the droplet moving direction.

The surface super-hydrophobicity of the elastic microcolumn is utilized, large-volume liquid drops can be placed on the surfaces of the microcolumns for transferring the super-hydrophobic liquid drops, the bending direction of each elastic microcolumn is changed rapidly along with the change of the direction of a magnetic field, so that the liquid drops can be driven to change the transportation direction rapidly, transportation of a complex path is realized, the magnetic field is moved from the initial position where the liquid drops are placed to a target position by moving the magnetic field, each elastic microcolumn corresponding to the magnetic field moving path is sequentially subjected to elastic deformation along with the movement of the magnetic field under the action of the magnetic field, the liquid drops are gradually moved to the target position along with the sequentially deformed elastic microcolumns, the transferring process of the liquid drops can be regulated and controlled through the magnetic field, and the transferring speed is high.

The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.