Electrified liquid drop non-fusion regulation and control system and control method based on open environment

Abstract

The invention relates to the field of electrohydrodynamics, and particularly provides a regulation and control system and a control method based on non-fusion of charged liquid drops in an open environment, the regulation and control system comprises a direct-current high-voltage source, an injection pump, a capillary probe and a dielectric nano ultramicro electrode, voltage with different polarities is utilized, and on the basis of electrohydrodynamics regulation and control, the regulation and control of the charged liquid drops in the open environment are realized. A non-fusion system of charged fluids with different polarities in an open environment is formed; the control method comprises the following steps: in an open system, the water-soluble liquid containing the dielectric nano ultramicro electrode passes through an injection pump at a specific flow rate and at a specific spatial distance by means of the electrohydrodynamic property formed by capillary probes applying high-voltage power supplies with different polarities; liquid drops with opposite polarities at the tip end of the probe can form a meniscus bridge at the liquid contact end under the action of Taylor cone sheath stress.

Description

Technical Field

[0001] The present invention relates to the field of electrohydrodynamics, and in particular to a control system and a control method based on non-fusion of charged droplets in a development environment. Background Art

[0002] Electrohydrodynamics (EHD) is a marginal subject between fluid mechanics and electrodynamics, and studies the interaction between unipolar charged fluid or polarized fluid and electric field. It is an important basic content of electrohydrodynamics of electrostatic atomization chamber. It can obtain a large number of fine, small, monodisperse, highly controllable and high deposition rate charged micro-droplets with low energy consumption. It has great potential in the fields of micro / nanoelectronic device manufacturing, micro combustion, air purification, space micro-power propulsion and bioengineering.

[0003] The complex charged multiphase flow generated by electrostatic atomization and its application process widely exists important phenomena such as deformation, breakup, fusion and separation of charged droplets. The electrohydrodynamic characteristics under the coupled field are extremely complex, especially the stability of the jet pattern and the study of the dynamic behavior of charged droplets have great application potential and value. At present, the research and application of the non-fusion of charged droplets is a hot topic in electrohydrodynamics. The outstanding problem in this research field is that it is impossible to observe the phenomenon of non-fusion of charged droplets on a scale of seconds, which restricts the development of technology in this field.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] The present invention provides a control system for the non-fusion of charged droplets, aiming to solve the problem that the non-fusion of charged droplets cannot be observed on a second scale, and provides a new perspective and new application scenario for the potential application of the non-fusion of charged droplets.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a non-fusion control system for charged droplets in an open environment.

[0007] A non-fusion control system for charged droplets in an open environment, comprising a DC high voltage source, a syringe pump, a capillary probe, and a dielectric nano-ultramicroelectrode; The DC high voltage source is used to generate high voltage to generate an electric field force on the liquid containing the dielectric nano-ultramicroelectrode, so that when the electric field force and the fluid sheath stress reach a state of equilibrium, a Taylor cone is formed at the tip of the capillary probe; The syringe pump is used to pump the liquid containing the dielectric nano-ultramicroelectrode into the capillary probe at a certain flow rate; The tip of the capillary probe is provided with a micrometer-scale hole structure to transform the fluid laminar flow into turbulent flow; The dielectric nano-ultramicroelectrode is used to form a meniscus bridge at a specific distance and under the action of different polarities of the Taylor cone; The DC high voltage source is divided into DC high voltage source 1 and DC high voltage source 2, and the capillary probe is divided into capillary probe 1 and capillary probe 2. The DC high voltage source 1 applies voltage to the capillary probe 1, and the DC high voltage source 2 applies voltage to the capillary probe 2. A gap is left between the tips of the capillary probe 1 and the capillary probe 2.

[0008] Furthermore, there are two capillary probes, the distance between the tips of the two capillary probes is 15-70 μm, and the angle between the capillary probes is 70-180°.

[0009] Furthermore, the inner diameter of the capillary probe is 100-350 μm.

[0010] The present invention also provides a control method for a charged droplet non-fusion control system in an open environment, comprising the following steps: S1, mixing water and dielectric electronic nano-ultramicroelectrodes to obtain an aqueous solution containing dielectric electronic nano-ultramicroelectrodes; S2, the aqueous solution in S1 is fed into the capillary probe through a delivery pump, and a DC high voltage source is applied to the tip of the capillary probe; S3, adjusting the polarity and voltage value of the DC high voltage source, setting the flow rate of the delivery pump, and adjusting the probe tip distance and tip angle; S4, the aqueous solution containing the dielectric nano-ultramicroelectrode forms a Taylor cone at the tip of the capillary probe, and a meniscus bridge is formed between two Taylor stacks, so that the meniscus bridge lasts for several seconds to several minutes.

[0011] Furthermore, the voltage of the DC high voltage source in S3 is 0.5-10 kV.

[0012] Furthermore, in S3, the inner diameter of the capillary probe is 100-350 μm, the distance between the capillary probe tips is 15-70 μm, and the angle between the capillary probes is 70-180°.

[0013] Furthermore, the flow rate of the dielectric electronic nano-ultramicroelectrode solution in S3 is 10-200 μL / min; the particle size of the dielectric electronic nano-ultramicroelectrode material is 20-80 nm, and the average distribution of the number of particles is between 50-1000.

[0014] Furthermore, the two capillary probes in S3 apply direct current high voltages of different polarities respectively, and form charged droplets by using the principle of electrohydrodynamics.

[0015] Furthermore, the difference between the DC high voltages of different polarities applied by the two capillary probes is 0.5-3.0 kV. The formation of the meniscus bridge is between the critical state of the stable Taylor cone and the formation of charged microdroplets by electrospray. The Taylor cones under positive and negative polarity conditions form an attractive force at a specific controlled distance to form a steady-state Taylor cone; the mutually attracted Taylor cones of different polarities will form a fused meniscus bridge at the tip.

[0016] Furthermore, the dielectric nano-ultramicroelectrodes in the solution in the meniscus bridge form electrophoresis under the action of potential difference, are arranged in a directional manner, and connect the meniscus bridge.

[0017] The principle of the present invention is: using high voltages with different polarities, combined with electrofluidic regulation, to form an unfused system and control method for charged fluids of different polarities in an open environment. The high voltage is used to form a Taylor cone at the tip of the probe with the help of fluid dynamics properties when the electric field force and the fluid sheath stress reach a state of equilibrium.

[0018] The liquid containing the nano-ultramicroelectrode with dielectric electronic properties is pumped into the capillary probe by regulating a certain flow rate, and driven by a specific flow rate, the liquid is transported and an electric field characteristic is imparted in the liquid laminar flow region.

[0019] With the help of the micron-scale pore structure at the probe tip, a special fluid transmission mode is formed in which sheath stress with eddy disturbance effect counteracts electric field stress during the process of fluid laminar flow transforming into turbulent flow.

[0020] The dielectric nano-ultramicroelectrode is used to form a meniscus bridge at a specific distance and under the action of different polarities of the Taylor cone.

[0021] The liquid supporting the meniscus bridge has special conductivity, and the liquid contains ultrafine nanomaterials with dielectric properties. The ultrafine nanomaterials have efficient electron transmission ability as microelectrodes.

[0022] The formation of the meniscus bridge is between the critical state of the stable Taylor cone and the charged microdroplets formed by electrospray. The Taylor cones under the positive and negative polarity conditions form an attractive force at a specific control distance to form a steady-state Taylor cone; the mutually attracted Taylor cones of different polarities will form a fused meniscus bridge at the tip.

[0023] The dielectric nano-ultramicroelectrode material in the solution forms electrophoresis under the action of potential difference, forming microelectrodes connecting the meniscus bridge.

[0024] The interconnected meniscus bridge has both energy field effect and material change effect. The energy field effect comes from the interconnection effect of DC high voltage, and the material change effect comes from the directional migration of matter under the action of the electric potential field.

[0025] The energy field effect and material change effect are not mainly controlled by the influence of the liquid gravity field. The determining factors depend on the dielectric properties of the liquid, the distance from the probe tip, and the periodic rate of the DC high voltage change.

[0026] The duration of the meniscus bridge is an essential prerequisite for the transfer of energy and the rapid migration of matter.

[0027] Compared with the prior art, the beneficial effects of the present invention are: in an open environment rather than a closed two-phase liquid environment, not only does it achieve the second-level non-fusion of charged droplets of different polarities, but also, through the introduction of dielectric nano-ultramicroelectrodes, it promotes the effective transmission of charge and the efficient transport of substances, thereby further expanding the further application potential of the non-fusion of charged droplets. The details are as follows: The present invention can effectively eliminate the non-fusion phenomenon of charged droplets mediated by gravity factors by horizontally setting a capillary probe with a spray function in an open environment. In the analysis of non-fusion factors, only the electric field force and the sheath stress caused by the liquid vortex are concerned, which simplifies the theoretical construction analysis factors.

[0028] The present invention records for the first time the development and occurrence of non-fusion of charged droplets on a time scale of seconds to minutes using a high-speed camera.

[0029] The invention has potential applications in energy transfer and material transport by adding a dielectric nano-ultramicroelectrode with charge transfer characteristics into the solution.

[0030] The present invention can realize the rapid switching of Taylor cone-meniscus bridge-fine electrostatic atomization by adjusting different spatial distances, voltage values ​​and polarities. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a schematic diagram of the structure of the charged droplet non-fusion system according to an embodiment of the present disclosure; Figure 2 A schematic diagram of Taylor cone electrospraying in the case of a fully open DC high voltage embodiment of the present disclosure; Figure 3 Schematic diagram of Taylor cone electrospraying in the case of left half open of DC high voltage in an embodiment of the present disclosure; Figure 4 Schematic diagram of Taylor cone electrospray in the case of a DC high voltage right half open in an embodiment of the present disclosure; Figure 5 Schematic diagram of Taylor cone-meniscus bridge formation at different distances (d1) in the case of a DC high voltage fully closed embodiment of the present disclosure; Figure 6 It is a schematic diagram of the formation of Taylor cone-meniscus bridge at different distances (d2) when the DC high voltage is fully turned on in an embodiment of the present disclosure; Figure 7 Schematic diagram of Taylor cone-meniscus bridge formation at different distances (d3) when DC high voltage is turned on in the embodiment of the present disclosure Figure 8 Transmission electron microscope image (scale is 5 μm) of the dielectric nano-ultramicroelectrode material of the embodiment of the present disclosure Fig. 9 Transmission electron microscope image (scale is 100 nm) of the dielectric nano-ultramicroelectrode material of the embodiment of the present disclosure Fig.10 This is a Taylor cone-meniscus bridge imaging image of the dielectric nano-ultramicroelectrode effect captured on a 5-second time scale according to an embodiment of the present disclosure; Fig.11 This is a Taylor cone-meniscus bridge imaging image of the dielectric nano-ultramicroelectrode effect captured on a 12-second time scale according to an embodiment of the present disclosure; Fig.12 This is a Taylor cone-meniscus bridge imaging image of the dielectric nano-ultramicroelectrode effect captured on a 14-second time scale according to an embodiment of the present disclosure; Fig.13 This is an imaging image of the Taylor cone-meniscus bridge of the dielectric nano-ultramicroelectrode effect captured on a 38-second time scale according to an embodiment of the present disclosure; Fig.14 This is a Taylor cone-meniscus bridge imaging image captured in 3 seconds based on the voltage difference effect according to an embodiment of the present disclosure; Fig.15 This is a Taylor cone-meniscus bridge imaging image captured in 8 seconds based on the voltage difference effect according to an embodiment of the present disclosure; Fig.16 This is a Taylor cone-meniscus bridge imaging image captured in 15 seconds based on the voltage difference effect according to an embodiment of the present disclosure; Fig.17 This is an imaging image of the Taylor cone-meniscus bridge captured at 53 seconds based on the voltage difference effect according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The numbers in the present embodiment, i.e., the drawings, are only used for schematic illustration and are not used to limit the present invention. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. If the specific conditions are not specified in this embodiment, the conventional conditions or the conditions recommended by the manufacturer shall be followed. The reagents or instruments used without indicating the manufacturer are all conventional products that can be purchased commercially. The capillary probe in this embodiment needs to be specially prepared.

[0034] The following is a detailed description of the system and method for controlling the non-fusion of charged droplets in an open environment according to an embodiment of the present disclosure.

[0035] See also Figure 1 As shown, it is a structural diagram of the charged droplet non-fusion control system based on an open environment of the present invention. The electric droplet non-fusion control body device includes a DC high voltage source 1, a DC high voltage source 2, a capillary probe 1, a capillary probe 2, a syringe pump, etc. The DC high voltage source 1 directly applies voltage to the capillary probe 1, and the DC high voltage source 2 directly applies voltage to the capillary probe 2. The capillary probe 1 and the capillary probe 2 are connected to the syringe pump. The diameter of the capillary probe 1 is diameter 1, and the diameter of the capillary probe 2 is diameter 2. The flow rate of the aqueous solution containing dielectric electronic nano-ultrafine electrode material in the capillary probe 1 is flow rate 1, and the flow rate of the aqueous solution containing dielectric electronic nano-ultrafine electrode material in the capillary probe 2 is flow rate 2, wherein the DC high voltage applied to the capillary probe 1 and the capillary probe 2 has different polarities, and the black sphere in the figure is the charged droplet at the top of the capillary probe.

[0036] In this embodiment, a DC high voltage source 1 and a DC high voltage source 2 are applied to the capillary probe 1 and the capillary probe 2, respectively. When the DC high voltage is turned on / off, the tops of the capillary probe 1 and the capillary probe 2 form a Taylor cone 1 and a Taylor cone 2, respectively, and an electrospray is formed between the Taylor cones. In an exemplary embodiment of the present invention, the distance between the spray ends of the capillary probe 1 and the capillary probe 2 is 0-40 mm.

[0037] Further, the angle between the capillary probe 1 and the capillary probe 2 is 70-180°. More preferably, in this embodiment, the angle between the capillary probe 1 and the capillary probe 2 is 100-180°.

[0038] Further, the inner diameter size of capillary probe 1 and capillary probe 2 is 10-350 μm. The inner diameter size of capillary probe 1 and capillary probe 2 can be the same or different. More preferably, in this embodiment, the inner diameter size of capillary probe 1 and capillary probe 2 is 50-160 μm.

[0039] Further, the capillary probe 1 and the capillary probe 2 apply a DC high voltage of 0.5-10 kV, and the polarity is different. The inner diameters of the capillary probe 1 and the capillary probe 2 can be the same or different. More preferably, in this embodiment, the capillary probe 1 and the capillary probe 2 apply a DC high voltage of different polarity, and the voltage value is 2.0-6.0 kV.

[0040] See also Figures 2 to 4 As shown, when DC high voltages of different polarities are applied to capillary probe 1 and capillary probe 2 respectively, at a specific angle and a specific distance, the two capillary probes are connected to the first injection pump and the second injection pump respectively, and a solution with a certain flow rate is delivered to the capillary probe by injection. With the help of the DC high voltage directly applied to the capillary probe, a Taylor cone tip based on the electrohydrodynamic principle is formed, and electrospray is concretized to form a charged micro-droplet jet, which is emitted under the spray, and a certain fusion zone is formed due to the electric polarity.

[0041] Furthermore, the DC high-voltage power supply switch of capillary probe 2 is turned off. Due to the absence of electrohydrodynamic effect, spherical droplets are formed at the tip of capillary probe 2, while capillary probe 1 still forms a Taylor cone at the tip with the help of electrohydrodynamic principle and forms electrospray charged microdroplets.

[0042] Furthermore, a switch of a DC high-voltage power supply of capillary probe one is turned off, the inner diameter of the capillary probe is increased, and the DC voltage applied to capillary probe two is increased, so that a spherical droplet is formed at the tip of capillary probe one. Under the dual conditions of an increased inner diameter and an increased voltage, a Taylor cone is formed at the tip of capillary probe two and electrospray charged microdroplets are formed with the help of the principle of electrohydrodynamics.

[0043] In an exemplary embodiment of the present disclosure, the capillary probe 1 and the capillary probe 2 are placed horizontally, and the spray probe tips are set at different reaction distances.

[0044] Further, the distance between capillary probe 1 and capillary probe 2 is 0-40 mm. More preferably, in this embodiment, the distance between capillary probe 1 and capillary probe 2 is 2-8 mm.

[0045] Further, the inner diameter size of capillary probe 1 and capillary probe 2 is 10-350 μm. The inner diameter size of capillary probe 1 and capillary probe 2 can be the same or different. More preferably, in this embodiment, the inner diameter size of capillary probe 1 and capillary probe 2 is 50-160 μm.

[0046] Further, the capillary probe 1 and the capillary probe 2 apply a DC high voltage of 0.5-10 kV, and the polarity is different. The inner diameters of the capillary probe 1 and the capillary probe 2 can be the same or different. More preferably, in this embodiment, the capillary probe 1 and the capillary probe 2 apply a DC high voltage of different polarity, and the voltage value is 2.0-6.0 kV.

[0047] See also Figures 5 to 7 As shown, when DC high voltages of different polarities are applied to capillary probe 1 and capillary probe 2, at a specific distance d1, the two capillary probes are respectively connected to the first injection pump and the second injection pump, and a solution with a certain flow rate is delivered to the capillary probes by injection. With the help of the pump driving force, in the absence of DC high voltage, non-charged droplets of different or same sizes are formed at the tips of capillary probe 1 and capillary probe 2, depending on the flow rate and inner diameter of each capillary probe.

[0048] Furthermore, the DC high voltage power switch of the capillary probe 2 is turned on, and the distance between the tips of the capillary probe 1 and the capillary probe 2 is set to d2 by means of electrohydrodynamics, and the tips of the capillary probe 1 and the capillary probe 2 respectively form Taylor cones depending on electrohydrodynamics.

[0049] Furthermore, the distance between the tip of capillary probe one and the tip of capillary probe two is adjusted to d3, and the tips of capillary probe one and capillary probe two respectively rely on electrohydrodynamics and add ultrafine nanomaterials with dielectric properties at a specific concentration, thereby forming a continuous meniscus bridge between the Taylor cone at the tip of capillary probe one and the Taylor cone at the tip of capillary probe two.

[0050] In an exemplary embodiment of the present disclosure, capillary probe 1 and capillary probe 2 are placed at different angles, the spray probe tip is set at different reaction distances, and dielectric electronic property ultrafine nanomaterials of different concentrations and particle sizes are added to the system.

[0051] See also Figure 8 and Fig. 9 As shown, the wide-angle and micro-angle transmission electron microscopy images of the dielectric properties of the nano-ultra-microelectrode forming the meniscus bridge. In the wide-angle transmission electron microscopy image, the particles are evenly dispersed in a solution of dielectric nanomaterials of a specific concentration, and the area of ​​5 square micrometers (μm 2) range, the number of particles is between 50-1000; in the micro-angle electron microscope image, within the range of 100 nm, the particle diameter is about 20-80 nm.

[0052] See also Figures 10 to 13 As shown, the liquid of capillary probe 1 on the left is a solution of a specific dielectric nanomaterial solution added to the aqueous solution, and the liquid of capillary probe 2 on the right is an aqueous solution. The voltages applied on the left and right sides are set to different polarities of capillary probe 1 and capillary probe 2, the voltage value is 2.0-6.0 kV, the flow rates of capillary probe 1 and capillary probe 2 are set to 10-200 μL / min, respectively, the distance between the tip of capillary probe 1 and the tip of capillary probe 2 is 0-40 mm, and the angle between the tip of capillary probe 1 and the tip of capillary probe 2 is 150°.

[0053] Furthermore, the tip of capillary probe 1 forms a Taylor cone under the action of electrohydrodynamics, and the tip of capillary probe 2 forms a Taylor cone under the action of electrohydrodynamics, and a droplet soft landing phenomenon is formed. As the flow rate changes, the droplet soft landing phenomenon gradually transitions to a positive and negative adsorption process, and forms a meniscus bridge at the liquid-liquid interface, and finally forms a stable meniscus bridge with a double spindle shape, which lasts for 20-80 s.

[0054] See also Figures 14 to 17 As shown in the figure, the liquid in the capillary probe 1 on the left is an aqueous solution, and the liquid in the capillary probe 2 on the right is a solution of dielectric nanomaterials with different concentrations of a specific material added to the aqueous solution. As the concentration of dielectric nanomaterials changes, the soft landing phenomenon of the droplets formed by capillary probes 1 and 2 is significantly reversed. As the concentration of dielectric nanomaterials increases, the spindle-shaped structure becomes more symmetrical and lasts for 40-150 s.

[0055] The above are only preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and invention concept of the present invention within the scope disclosed by the present invention, which are within the protection scope of the present invention.

Claims

1. A non-fusion control system for charged droplets in an open environment, characterized in that: It includes a direct current high voltage source, a syringe pump, a capillary probe and a dielectric electronic nano-ultramicroelectrode; The DC high voltage source is used to generate high voltage to generate an electric field force on the liquid containing the dielectric nano-ultramicroelectrode, so that when the electric field force and the fluid sheath stress reach a state of equilibrium, a Taylor cone is formed at the tip of the capillary probe; The syringe pump is used to pump the liquid containing the dielectric nano-ultramicroelectrode into the capillary probe at a certain flow rate; The tip of the capillary probe is provided with a micrometer-scale hole structure to transform the fluid laminar flow into turbulent flow; The dielectric nano-ultramicroelectrode is used to form a meniscus bridge at a specific distance and under the action of different polarities of the Taylor cone; The DC high voltage source is divided into DC high voltage source 1 and DC high voltage source 2, and the capillary probe is divided into capillary probe 1 and capillary probe 2. The DC high voltage source 1 applies voltage to the capillary probe 1, and the DC high voltage source 2 applies voltage to the capillary probe 2. A gap is left between the tips of the capillary probe 1 and the capillary probe 2.

2. According to claim 1, a system for controlling the non-fusion of charged droplets in an open environment, characterized in that: The tip distance between the capillary probe 1 and the capillary probe 2 is 15-70 μm, and the angle between the two is 70-180°.

3. According to claim 1, a system for controlling the non-fusion of charged droplets in an open environment, characterized in that: The inner diameter of the capillary probe is 100-350 μm.

4. The control method of the non-fusion control system of charged droplets in an open environment according to claim 1 is characterized in that The following steps are involved: S1, mixing water and dielectric electronic nano-ultramicroelectrodes to obtain an aqueous solution containing dielectric electronic nano-ultramicroelectrodes; S2, the aqueous solution in S1 is fed into the capillary probe through a delivery pump, and a DC high voltage source is applied to the tip of the capillary probe; S3, adjusting the polarity and voltage value of the DC high voltage source, setting the flow rate of the delivery pump, and adjusting the probe tip distance and tip angle; S4, the aqueous solution containing the dielectric nano-ultramicroelectrode forms a Taylor cone at the tip of the capillary probe, and a meniscus bridge is formed between two Taylor stacks, so that the meniscus bridge lasts for several seconds to several minutes.

5. According to claim 4, a control method based on a charged droplet non-fusion control system in an open environment is characterized in that: The voltage of the DC high voltage source in S3 is 0.5-10 kV.

6. According to claim 4, a control method for a charged droplet non-fusion control system in an open environment; characterized in that: The inner diameter of the capillary probe in S3 is 100-350 μm, the distance between the capillary probe tips is 15-70 μm, and the angle between the capillary probes is 70-180°.

7. According to claim 4, a control method based on a charged droplet non-fusion control system in an open environment is characterized in that: The flow rate of the dielectric electron nano-ultramicroelectrode solution contained in S3 is 10-200 μL / min. The particle size of the dielectric electron nano-ultramicroelectrode material is 20-80 nm, and the average distribution of the number of particles is between 50-1000.

8. The control method of the charged droplet non-fusion control system in an open environment according to claim 4 is characterized in that: In S3, two capillary probes apply DC high voltages of different polarities respectively, and with the help of electrohydrodynamic principles, charged droplets are formed.

9. The control method of the charged droplet non-fusion control system in an open environment according to claim 8, characterized in that: The difference between the DC high voltages of different polarities applied by the two capillary probes is 0.5-3.0 kV. The formation of the meniscus bridge is between the critical state of the stable Taylor cone and the charged microdroplets formed by electrospray. The Taylor cones under positive and negative polarity conditions form an attractive force at a specific controlled distance to form a steady-state Taylor cone; the Taylor cones of different polarities that attract each other will form a fused meniscus bridge at the tip.

10. The control method of the charged droplet non-fusion control system in an open environment according to claim 9, characterized in that: The dielectric nano-ultramicroelectrodes in the meniscus bridge solution form electrophoresis under the action of potential difference, are arranged in a directional manner, and connect the meniscus bridges.

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