CN111628625B - Device for driving liquid metal liquid drops by light-controlled electric field - Google Patents
Device for driving liquid metal liquid drops by light-controlled electric field Download PDFInfo
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- CN111628625B CN111628625B CN202010395499.6A CN202010395499A CN111628625B CN 111628625 B CN111628625 B CN 111628625B CN 202010395499 A CN202010395499 A CN 202010395499A CN 111628625 B CN111628625 B CN 111628625B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K44/00—Machines in which the dynamo-electric interaction between a plasma or flow of conductive liquid or of fluid-borne conductive or magnetic particles and a coil system or magnetic field converts energy of mass flow into electrical energy or vice versa
- H02K44/02—Electrodynamic pumps
Abstract
The invention discloses a device for driving liquid metal droplets by a light-controlled electric field, which comprises a water tank, a circuit board, a power supply, a light sensor, a circuit board, a transparent filler and a control circuit, wherein the circuit board is arranged in the water tank and penetrates through the water tank through a lead to be connected with the control circuit; when the liquid metal liquid drops are immersed in the electrolyte, when laser irradiates a certain optical sensor, the control circuit connects the needle-shaped electrode which is closely adjacent to the optical sensor with the positive electrode of a power supply, an electric field is formed in the electrolyte between the needle-shaped electrode and the annular negative electrode, the liquid metal liquid drops can be driven to move towards the laser facula to the positive electrode, and the liquid metal liquid drops irradiating the optical sensors at different positions can move along the moving track of the laser. The invention can be applied to the fields of drug transportation, microfluid, biochip and microrobot.
Description
Technical Field
The invention belongs to the technical field of microfluid, and particularly relates to a device for driving liquid metal droplets by a light-controlled electric field.
Background
The gallium-based liquid metal alloy is a two-phase or multi-phase alloy composed of gallium and at least one metal selected from indium, tin, zinc, bismuth, silver and aluminum. The gallium-based liquid metal alloy has good mechanical fluidity, low biotoxicity and higher electrical conductivity at room temperature. The excellent physical and chemical properties of the gallium-based liquid metal alloy enable the gallium-based liquid metal alloy to have wide application prospects in the fields of flexible circuits, flexible robots, sensors and microfluids.
Some past studies have demonstrated that liquid metal can be used as a carrier or actuator. They are used for drug loading, micro object transport, liquid pumping, and robot drivers. To achieve actuation of the liquid metal, many methods such as electric field, ion imbalance, magnetic field, etc. have been tried. However, these methods have problems of small application range, difficult control, damage to the properties of the liquid metal itself, poor motion performance, and the like.
In order to realize the rapid and accurate movement of the liquid metal liquid drop on a two-dimensional plane, the invention designs a device for driving the liquid metal liquid drop by a light-controlled electric field. The invention utilizes laser to activate the light sensors at different positions to control the on-off of the corresponding electrodes and guide liquid metal drops immersed in the electrolyte to move along with the laser. The device for driving the liquid metal droplets by the optically controlled electric field has the characteristics of simple structure, simple control method and good movement performance of the liquid metal droplets, and is suitable for controlling the movement of the liquid metal droplets in various electrolytes.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a device for driving liquid metal droplets by a light-controlled electric field, which becomes a brand-new liquid metal motion control mode, expands the application of liquid metal in the field of microfluid, and has the characteristics of simple structure, simple control method and good liquid metal droplet motion performance.
In order to achieve the purpose, the invention adopts the technical scheme that:
a device for driving liquid metal droplets by a light-controlled electric field comprises a water tank 1, a circuit board 8 is arranged in the water tank 1 and penetrates through the water tank through a lead to be connected with a control circuit 10, a power supply 11 is connected with the control circuit 10, optical sensors 3 and needle-shaped electrodes 4 are closely adjacent and densely arranged on the circuit board 8, and annular negative electrodes 9 are arranged around the circuit board 8; the circuit board 8 is poured in the transparent filler 2, and only the tip ends of the pin-shaped electrodes 4 are exposed; when the liquid metal droplet 7 is immersed in the electrolyte 6, and the laser 5 irradiates a certain optical sensor 3, the control circuit 10 connects the needle electrode 4 closely adjacent to the optical sensor 3 to the positive electrode of the power supply 11, and an electric field is formed in the electrolyte 6 between the needle electrode 4 and the annular negative electrode 9, so that the liquid metal droplet 7 can be driven to move towards the laser 5 light spot, and the optical sensors 3 at different positions are irradiated, and the liquid metal droplet 7 can move along the moving track of the laser 5.
Further, the water tank 1 is a supporting structure manufactured by acid and alkali resistant plastic washing and cutting.
Further, the photo sensor 3 is closely adjacent to and densely arranged on the circuit board 8 with the pin electrodes 4, and the photo sensor 3 is positively turned on by the control circuit 10 when irradiated with the laser light 5.
Further, the annular negative electrode 9 is disposed around the circuit board 8, and an electric field directed from the annular negative electrode 9 to the needle-shaped electrode 4 can be formed.
Further, the transparent filler 2 is poured to cover the circuit board 8, and only the tip ends of the pin electrodes 4 are exposed.
Further, the material of the transparent filler 2 capable of sealing the circuit board 8 and preventing the electrolyte 6 from causing short circuit of the circuit board 8 is polyurethane, epoxy resin, and silica gel curable transparent or semitransparent pouring sealant.
Further, the light sensor 3 is of the type of a photodiode, a phototransistor or other photosensor.
Further, the material of the pin electrode 4 is iron, tungsten, gold or other conductive materials.
Further, the material of the annular negative electrode 9 placed around the circuit board 8 is graphite, tungsten or other conductive material.
Further, the liquid metal droplet 7 is made of a two-phase or multi-phase alloy of gallium and at least one metal selected from indium, tin, zinc, bismuth, silver and aluminum.
Further, the number of the liquid metal droplets 7 is one or more, and the number of the lasers 5 is one or more, that is, a single laser 5 operates a single liquid metal droplet 7 or a plurality of lasers 5 operate a plurality of liquid metal droplets 7 simultaneously.
Further, the liquid metal droplets 7 are always on the upper surface of the transparent filler 2 and are always immersed in the electrolyte 6.
Further, the control circuit 10 is connected with the power supply 11 through a lead, the control circuit 10 is connected with the optical sensor 3, the needle electrode 4 and the annular negative electrode 9 through leads, and the control circuit 10 is used for detecting whether the optical sensor 3 is illuminated or not so as to control the connection and disconnection of the needle electrode 4 and the power supply 11.
Further, the power supply 11 is a dc regulated power supply, and is a battery or an external dc regulated power supply input power supply.
Further, the upper surface of the transparent filler 2 may be polished or treated using a super-hydrophobic technique, thereby reducing the resistance of the liquid metal droplet 7 to the upper surface of the transparent filler 2.
The electrolyte 6 is an acidic electrolyte, an alkaline electrolyte, or a neutral electrolyte, and is capable of forming an electric field and an electric current when a power supply is applied.
Compared with the prior art, the invention controls the movement of the liquid metal droplets by utilizing light, and has high flexibility and simple control method. The invention can control the number of the liquid metal drops to be one or more, thereby greatly expanding the application range of the invention. The invention uses light to control and uses electric field drive at the same time, and the liquid metal droplet has good motion performance.
Drawings
FIG. 1 is a schematic diagram of a longitudinal cross-sectional configuration of a light-controlled electric field-driven liquid metal droplet apparatus of the present invention powered by a battery using a laser beam to control individual liquid metal droplets;
fig. 2 is a schematic top view of a light-controlled electric field driven liquid metal droplet apparatus of the present invention using three laser beams to control three liquid metal droplets powered by an external power source.
Wherein: the device comprises a water tank 1, a transparent filler 2, an optical sensor 3, a needle electrode 4, a laser 5, an electrolyte 6, liquid metal droplets 7, a circuit board 8, an annular negative electrode 9, a control circuit 10 and a power supply 11.
Detailed Description
Example 1:
fig. 1 is a schematic longitudinal sectional view of a device for driving liquid metal droplets by a light-controlled electric field, which is powered by a battery and uses a laser beam to control individual liquid metal droplets according to the present invention. In this embodiment, the water tank 1 is a supporting structure made by acid and alkali resistant organic glass washing and cutting, and the circuit board 8 is placed in the center of the water tank and connected with the control circuit 10 through a wire. The power supply 11 is powered by a battery and is connected to the control circuit 10 and the annular negative electrode 9 through wires. The light sensor 3 is a phototriode and the pin electrodes 4 are made of iron and are closely adjacent and densely arranged on the circuit board 8. The material of the annular negative electrode 9 arranged around the circuit board 8 is graphite, the transparent filler 2 is epoxy resin, and the circuit board 8 is poured and covered, and only the tip ends of the pin-shaped electrodes 4 are exposed. The electrolyte 6 is 0.3mol/L sodium hydroxide solution, and a single liquid metal droplet 7 is always on the upper surface of the transparent filler 2 and is always immersed in the electrolyte 6. When the laser 5 irradiates a certain optical sensor 3, the control circuit 10 connects the needle electrode 4 closely adjacent to the optical sensor 3 to the positive electrode of the power supply 11, an electric field is formed in the electrolyte 6 between the needle electrode 4 and the annular negative electrode 9, the liquid metal droplet 7 can be driven to move towards the laser 5 light spot, and the liquid metal droplet 7 can move along the moving track of the laser 5 when the optical sensor 3 at different positions is irradiated. As shown in fig. 1, the arrows indicate the direction of movement of the liquid metal droplet 7 at this time.
Example 2:
fig. 2 is a schematic top view of a light-controlled electric field driven liquid metal droplet apparatus of the present invention using three laser beams to control three liquid metal droplets powered by an external power source. In this embodiment, the water tank 1 is a supporting structure made by acid and alkali resistant organic glass washing and cutting, and the circuit board 8 is placed in the center of the water tank and connected with the control circuit 10 through a wire. The power supply 11 is powered by an external direct current voltage-stabilizing source and is connected to the control circuit 10 and the annular negative electrode 9 through leads. The light sensor 3 is a phototriode and the pin electrodes 4 are made of tungsten and are closely adjacent and densely arranged on the circuit board 8. The annular negative electrode 9 placed around the circuit board 8 is made of copper, the transparent filler 2 is made of polyurethane, and the circuit board 8 is poured to cover, so that only the tips of the pin-shaped electrodes 4 are exposed. The electrolyte 6 is 0.5mol/L hydrochloric acid solution, and three liquid metal drops 7 are always on the upper surface of the transparent filler 2 and are always immersed in the electrolyte 6. When three beams of laser 5 irradiate three optical sensors 3 respectively, the control circuit 10 connects the needle-shaped electrode 4 closely adjacent to the three optical sensors 3 to the positive electrode of the power supply 11, an electric field is formed in the electrolyte 6 between the needle-shaped electrode 4 and the annular negative electrode 9, so that three liquid metal droplets 7 can be driven to move towards three laser 5 light spots, the optical sensors 3 at different positions are irradiated, and the three liquid metal droplets 7 can move along the moving tracks of the three laser 5 respectively. As shown in fig. 2, the three arrows indicate the direction of movement of the three liquid metal droplets 7 at this time.
Finally, it should be noted that the above embodiment of the device for driving liquid metal droplets by an optically controlled electric field is only used to illustrate the technical solution of the present invention and is not limited thereto. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (14)
1. A device for driving liquid metal droplets by a light-controlled electric field is characterized by comprising a water tank (1), a circuit board (8) is placed in the water tank (1) and penetrates through the water tank through a lead to be connected with a control circuit (10), a power supply (11) is connected with the control circuit (10), optical sensors (3) and needle-shaped electrodes (4) are closely adjacent and densely arranged on the circuit board (8), and annular negative electrodes (9) are placed around the circuit board (8); the circuit board (8) is poured in the transparent filler (2), and only the tip end of the needle-shaped electrode (4) is exposed; when the liquid metal droplet (7) is immersed in the electrolyte (6), and the laser (5) irradiates a certain optical sensor (3), the control circuit (10) switches on the needle electrode (4) which is closely adjacent to the optical sensor (3) to the positive electrode of the power supply (11), and forms an electric field in the electrolyte (6) between the needle electrode (4) and the annular negative electrode (9), so that the liquid metal droplet (7) can be driven to move towards the laser (5) light spot, the optical sensors (3) at different positions are irradiated, and the liquid metal droplet (7) can move along the moving track of the laser (5);
the optical sensor (3) and the needle-shaped electrode (4) are closely adjacent and densely arranged on the circuit board (8), and when the optical sensor (3) is irradiated by laser (5), the needle-shaped electrode (4) is connected with the positive pole by the control circuit (10);
the annular negative electrode (9) is placed around the circuit board (8) to form an electric field pointing from the annular negative electrode (9) to the needle-shaped electrode (4).
2. The optically controlled electric field driven liquid metal droplet apparatus of claim 1, wherein said water trough (1) is a support structure made of acid and alkali resistant plastic milling.
3. A light-controlled electric-field-driven liquid metal droplet apparatus according to claim 1, wherein the transparent filler (2) is poured over a circuit board (8) to expose only the tips of the pin electrodes (4).
4. A light-controlled electric-field-driven liquid metal droplet apparatus according to claim 3, characterized in that the material of the transparent filler (2) capable of sealing the circuit board (8) from short-circuiting the circuit board (8) by the electrolyte (6) is polyurethane, epoxy, silicone-curable transparent or translucent potting compound.
5. A light-controlled electric-field-driven liquid metal droplet device according to claim 1, characterized in that the light sensor (3) is of the type of a photodiode or a phototransistor.
6. A light controlled electric field driven liquid metal droplet apparatus as claimed in claim 1, characterized in that the material of the needle electrode (4) is iron, tungsten or gold.
7. A light-controlled electric-field-driven liquid metal droplet apparatus according to claim 1, characterized in that the material of the annular negative electrode (9) placed around the circuit board (8) is graphite or tungsten.
8. A device for optically controlling an electric field driven liquid metal droplet according to claim 1, characterized in that the liquid metal droplet (7) is a two-or multi-phase alloy of gallium and at least one of indium, tin, zinc, bismuth, silver and aluminum.
9. A device for optically controlling electric field driven liquid metal droplets according to claim 1, characterized in that the number of liquid metal droplets (7) is one or more and the number of lasers (5) is one or more, i.e. a single laser (5) is operating a single liquid metal droplet (7) or a plurality of lasers (5) are operating a plurality of liquid metal droplets (7) simultaneously.
10. A device for optically controlling electric field driven liquid metal droplets as claimed in claim 1, characterized in that the liquid metal droplets (7) are always on the upper surface of the transparent filling (2) and are always immersed in the electrolyte (6).
11. A photo-controlled electric field driven liquid metal droplet apparatus as claimed in claim 1, wherein the control circuit (10) is connected to the power supply (11) via wires, the control circuit (10) is connected to the photo-sensor (3), the needle electrode (4) and the ring-shaped negative electrode (9) via wires, and the control circuit (10) is used to detect whether the photo-sensor (3) is illuminated and further control the connection and disconnection of the needle electrode (4) and the power supply (11).
12. A light-controlled electric-field-driven liquid metal droplet apparatus as claimed in claim 11, wherein said power supply (11) is a dc regulated power supply, and is a battery or an external dc regulated power supply.
13. A light-controlled electric-field-driven liquid metal droplet apparatus according to claim 10, wherein the upper surface of the transparent filler (2) is polished or treated using a superhydrophobic technique to reduce the resistance between the liquid metal droplet (7) and the upper surface of the transparent filler (2).
14. A light-controlled electric-field-driven liquid metal droplet apparatus as claimed in claim 10, wherein the electrolyte (6) is an acid electrolyte, an alkaline electrolyte or a neutral electrolyte, and is capable of forming an electric field and an electric current when a power supply is applied.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010395499.6A CN111628625B (en) | 2020-05-12 | 2020-05-12 | Device for driving liquid metal liquid drops by light-controlled electric field |
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| CN202010395499.6A CN111628625B (en) | 2020-05-12 | 2020-05-12 | Device for driving liquid metal liquid drops by light-controlled electric field |
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| CN111628625A CN111628625A (en) | 2020-09-04 |
| CN111628625B true CN111628625B (en) | 2021-12-10 |
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| CN112717851A (en) * | 2020-12-24 | 2021-04-30 | 苏州大学 | Device and method for optically driving liquid metal micro-droplets |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS6050280B2 (en) * | 1981-07-16 | 1985-11-07 | 康彦 森 | Method for promoting heat transfer or mass transfer between droplets and continuous phase fluid by applying electric field |
| JPH02205234A (en) * | 1989-02-02 | 1990-08-15 | Nippon Kinzoku Kogyo Kk | Method for detecting molten metal surface level in cast strip continuous casting |
| JP3922177B2 (en) * | 2002-02-12 | 2007-05-30 | セイコーエプソン株式会社 | Film forming method, film forming apparatus, droplet discharge apparatus, color filter manufacturing method, display apparatus manufacturing method |
| JP2004336898A (en) * | 2003-05-08 | 2004-11-25 | Olympus Corp | Liquid moving means |
| US7767185B2 (en) * | 2003-09-30 | 2010-08-03 | Nec Corporation | Method of producing a carbon nanotube and a carbon nanotube structure |
| JP4872364B2 (en) * | 2006-02-01 | 2012-02-08 | ソニー株式会社 | Liquid transfer device |
| US8741119B1 (en) * | 2011-03-03 | 2014-06-03 | U.S. Department Of Energy | Actinide ion sensor for pyroprocess monitoring |
| CN105071688B (en) * | 2015-08-28 | 2017-03-29 | 清华大学 | It is a kind of based on the magnetic control motor of liquid metal, manufacture method and its application |
| CN206020809U (en) * | 2016-08-29 | 2017-03-15 | 云南科威液态金属谷研发有限公司 | Light adjusting means based on liquid metal electrostrictive and light adjust planar array |
| CN106363603B (en) * | 2016-11-21 | 2018-11-23 | 清华大学 | A kind of miniature toter of liquid metal driving |
| CN106677455B (en) * | 2016-12-05 | 2019-07-05 | 云南科威液态金属谷研发有限公司 | A kind of Intellective wallpaper based on liquid metal |
| CN106956073A (en) * | 2017-04-20 | 2017-07-18 | 中国科学技术大学 | The method and destructor of a kind of groove profile hot melt interface Explosion composite of sheet metal |
| KR101951867B1 (en) * | 2017-06-07 | 2019-02-25 | 울산과학기술원 | 3D finger motion measurement system using 3D printing and manufacturing method of the same |
| CN108189077A (en) * | 2018-03-08 | 2018-06-22 | 中国科学技术大学 | The automatic drive device of liquid metal driving |
| CN108527012A (en) * | 2018-05-21 | 2018-09-14 | 浙江工业大学 | A kind of device carrying out big plane polishing using liquid metal polishing fluid |
| CN209312321U (en) * | 2018-08-13 | 2019-08-27 | 云南科威液态金属谷研发有限公司 | A kind of electric field driven device of liquid metal |
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