CN111198052A - Deformable liquid sensor - Google Patents
Deformable liquid sensor Download PDFInfo
- Publication number
- CN111198052A CN111198052A CN202010037464.5A CN202010037464A CN111198052A CN 111198052 A CN111198052 A CN 111198052A CN 202010037464 A CN202010037464 A CN 202010037464A CN 111198052 A CN111198052 A CN 111198052A
- Authority
- CN
- China
- Prior art keywords
- liquid
- liquid metal
- deformable
- change
- sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/02—Measuring force or stress, in general by hydraulic or pneumatic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/02—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
A deformable liquid sensor comprises a flexible packaging layer, wherein the flexible packaging layer is a cavity with two openings, electrolyte solution is packaged in the cavity, liquid metal liquid drops are contained in the electrolyte solution, leads are led out of the two openings, connected into a circuit part and sealed by sealing plugs respectively, the liquid metal liquid drops respond under the action of external force and an external magnetic field and change in form, and the change is converted into the change of an electrical signal to realize a monitoring function. According to the invention, by utilizing the deformation and special electromagnetic response of the liquid metal, the liquid metal liquid drop can respond to the change of the external environment, so that the sensing effect is achieved, and the deformable degree of the liquid metal liquid drop is higher than that of a common flexible sensor. The flexible sensor has high degree of freedom, can deform to a large extent, highly imitates the working form in a living body, and breaks through the limitation of the traditional flexible sensor. The invention can realize biosensing in a liquid environment and provides a new idea for the sensor applied in the organism.
Description
Technical Field
The invention belongs to the technical field of sensors and liquid metal, relates to a liquid sensor, and particularly relates to a deformable liquid sensor.
Background
The sensor has important application in the biomedical field, and the sensor is required to be used in wearable equipment, biomedical detection, flexible robots and other aspects. Common sensors can be classified into resistive sensors, capacitive sensors, electrochemical sensors, and the like according to principles; the sensor can be classified into a mechanical sensor, a temperature sensor, a biosensor, etc. according to the application route.
With the advent of wearable and implantable medical devices, traditional rigid sensors have failed to meet the demand, and therefore flexible sensors have gained widespread attention and become an important research direction. The flexible sensor has good laminating nature, can improve the travelling comfort of implanting or wearing the device, and the change of measuring position is measured in detection that simultaneously can be accurate, improves accuracy and sensitivity.
The working principle of the existing flexible sensor is that a flexible material is generally used as a substrate, and liquid metal is drawn into a specific circuit signal. At present, a flexible sensor based on liquid metal mainly comprises a pressure sensor and a stress sensor, and the working principle of the flexible sensor is that a circuit deforms under the action of external force, so that the resistance or the capacitance changes. However, the principle of the flexible sensor is simple, and in the case of high deformation, disconnection and the like still occur. The liquid sensor provided by the invention has higher degree of freedom, can better adapt to the liquid environment in a human body, and has great potential in the aspects of human health monitoring, robots and the like.
Disclosure of Invention
To overcome the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide a deformable liquid sensor that encapsulates a liquid metal droplet in a flexible material and is connected to an external circuit. The liquid metal is deformed under the action of an external force or an external magnetic field, and finally, the current is changed, so that the sensing effect is achieved.
In order to achieve the purpose, the invention adopts the technical scheme that:
a deformable liquid sensor comprises a flexible packaging layer 1, wherein the flexible packaging layer 1 is a cavity with two openings, liquid metal liquid drops 3 and electrolyte solution 4 are packaged in the cavity, lead wires are led out of the two openings and connected into a circuit part 5, the lead wires are in direct contact with the liquid metal and are respectively sealed by sealing plugs 2, the sealing plugs 2 simultaneously play a role in fixing the positions of the lead wires, the liquid metal liquid drops 3 respond and change in shape under the action of external force and an external magnetic field, and the change is converted into the variation of an electrical signal to realize a monitoring function.
The flexible encapsulating layer 1 is made of a polymer having an elasticity higher than a set value and has a thickness of 100 μm. Commonly used polymer materials include EcoFlex and PDMS, among others.
The sealing plug 2 is made of a colloid material having a sealing property and an adhesive property higher than a predetermined value, such as latex.
The liquid metal droplets 3 are gallium and alloys thereof.
The liquid metal droplets 3 are eutectic gallium-indium alloy and consist of 75.5 mass percent of gallium and 24.5 mass percent of indium.
The liquid metal droplets 3 are single droplets which are gathered together, have the diameter of 5-10 mm and are directly obtained by injection of an injector.
The liquid metal droplet 3 and the electrolyte solution 4 are in a volume ratio of 4: 1.
The electrolyte solution 4 is a sodium hydroxide solution.
The circuit part 5 comprises or consists directly of a power supply, a resistor, a current meter and a wire.
The power supply is a battery or a signal generator and provides an electric signal for the whole circuit; the ammeter is used for measuring current change caused by the influence of the external environment on the liquid metal droplets 3, and the lead is used for communicating elements in the circuit with the liquid metal droplets 3. The tail end of the lead is of a peak structure, can pierce the packaging layer 1 and is in contact with the liquid metal liquid drop 3, and meanwhile, the sealing plug 2 seals and fixes the position of the lead.
The deformable liquid sensor is different from other flexible sensors based on gallium-indium alloy, liquid metal is not drawn into specific circuit signals, and liquid drops of the liquid metal are directly used as sensing units of the sensors. Because the liquid metal has good electromagnetic response, under the condition of an external acting force and a magnetic field, the liquid metal can change in form, so that the resistance of a circuit is changed, and the change of the circuit is reflected on the change of the current. Compared with the common flexible sensor, the liquid sensor has better deformability and can better simulate the liquid environment of an organism.
Drawings
FIG. 1 is a schematic diagram of the present invention.
Fig. 2 is a schematic diagram showing the change of liquid metal droplets under the action of external force pressing according to the present invention.
FIG. 3 is a schematic diagram of the variation of liquid metal droplets under the action of an applied magnetic field according to the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings and examples.
As shown in fig. 1, the deformable liquid sensor of the present invention includes a flexible package layer 1, the flexible package layer 1 is a chamber with two openings, liquid metal droplets 3 and electrolyte solution 4 are packaged in the chamber, lead wires are led out from the two openings and connected to a circuit portion 5, the lead wires are in direct contact with the liquid metal and are respectively sealed by sealing plugs 2, the sealing plugs simultaneously play a role of fixing the positions of the lead wires, the liquid metal droplets 3 respond and change in form under the action of external force and external magnetic field, and the change is converted into the variation of electrical signals, so as to realize the monitoring function.
In particular, the flexible encapsulation layer 1, which is used to encapsulate the liquid metal droplet 3, is typically made of a polymer with good elasticity and has a thickness of 100 μm. Commonly used polymer materials include EcoFlex and PDMS, among others.
The sealing plug 2 is used for sealing the openings at two sides and preventing the electrolyte solution 4 and the liquid metal drops 3 in the packaging layer from leaking, and is made of colloid materials with sealing performance and adhesive force higher than set values, such as latex.
The liquid metal droplets 3 are gallium and its alloys, commonly referred to as eutectic gallium indium alloys, consisting of 75.5% gallium and 24.5% indium by mass. The diameter of the liquid metal micro-droplets is generally 5-10 mm, and can be directly obtained by injection through a syringe.
The electrolyte solution 4 is typically a sodium hydroxide solution. Gallium and its alloys are rapidly oxidized in air to form an oxide layer. And a sodium hydroxide solution is adopted during packaging, so that an oxide layer on the surface can be removed, and the conductivity of the solution can be increased. In this example, the volume ratio of the liquid metal droplet 3 to the electrolyte solution 4 was 4: 1.
The circuit part 5 comprises or consists directly of a power supply, a resistor, a current meter and a wire. The power source may be a battery, a signal generator, or the like, which provides an electrical signal to the overall circuit. The resistor functions as a protection circuit. The ammeter is used to measure the change in current caused by the influence of the external environment on the liquid metal droplet 3. The leads are conventional leads and are used for connecting the circuit elements with the liquid metal droplets 3.
The sensor realizes the breakthrough from rigidity to flexibility to liquid state, and can better simulate the environment in an organism. Before use, the liquid metal droplet 3 is connected to a power supply, a resistor, and an ammeter. After the circuit is connected, the ammeter will display a current value when the liquid metal droplet 3 is in equilibrium. Changing the position of the circuit will break the original equilibrium of the liquid metal droplet 3, resulting in a change in the current. Similarly, when an external force is applied to press or an external magnetic field is applied, the resistance of the liquid metal droplet 3 will also change, causing a change in current.
The sensor can realize biosensing in a liquid environment, and provides a new idea for the sensor applied in a living body. Cells, tissues and the like in the living body are all in a liquid environment. The sensor highly simulates the internal environment of a living being, the liquid metal liquid drop 3 is like a cell and can respond to the external environment, and meanwhile, the shape of the liquid metal liquid drop is not restrained and can deform to a greater degree.
In the use process of the deformable liquid sensor, the deformable liquid sensor is mainly based on that the liquid metal liquid drops 3 respond to external force and external magnetic field, so that the form is changed, the change of the electrical signals is converted, and the monitoring function is realized. As shown in fig. 2, the liquid metal droplet 3 is pushed by an external force to expand outward and become flat, and the resistance changes, and the magnitude of the current changes accordingly. Fig. 3 shows the change of the liquid droplet under the external magnetic field 6, under the action of which the liquid droplet will change from liquid to solid, also causing the change of resistance and current.
In summary, the present invention provides a deformable liquid sensor, which utilizes the deformation and special electromagnetic response of liquid metal to make liquid metal droplets respond to the change of external environment, so as to achieve the sensing effect. Meanwhile, the degree of deformation of the flexible sensor is higher than that of a common flexible sensor because the flexible sensor is in a liquid environment. . The system can realize biosensing in a liquid environment, and provides a new idea for the sensor applied in a living body. The liquid sensor has high degree of freedom, can deform to a large extent, highly imitates the working form in a living body, and breaks through the limitation of the traditional flexible sensor.
What has been described above is only a preferred embodiment of the present invention, and parameters (such as material, size and shape) of the components of the detection system for detecting the electric double layer characteristics on the surface of the liquid metal, that is, the flexible encapsulation layer 1, the sealing plug 2, the liquid metal droplet 3, the electrolyte solution 4 and the circuit part 5, can be modified according to the needs of experiments. It should be noted that those skilled in the art can make various modifications and substitutions without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protective scope of the present invention.
Claims (10)
1. A deformable liquid sensor is characterized by comprising a flexible packaging layer (1), wherein the flexible packaging layer (1) is a cavity with two openings, liquid metal droplets (3) and electrolyte solution (4) are packaged in the cavity, leads are led out of the two openings and connected into a circuit part (5), the leads are in direct contact with the liquid metal and are respectively sealed by sealing plugs (2), the liquid metal droplets (3) respond and change in form under the action of external force and an external magnetic field, and the change is converted into the change of an electrical signal to realize a monitoring function.
2. A deformable liquid state sensor according to claim 1, characterized in that the flexible encapsulation layer (1) is made of a polymer with an elasticity higher than a set value and has a thickness of 100 micrometers.
3. A deformable liquid state sensor according to claim 1, characterized in that the sealing plug (2) is made of a rubber material having a sealing property higher than a set value.
4. The deformable liquid sensor of claim 1, wherein the liquid metal droplet (3) is gallium and its alloys.
5. A deformable liquid state sensor according to claim 1, characterized in that the liquid metal droplet (3) is a eutectic gallium indium alloy, consisting of 75.5% gallium and 24.5% indium by mass fraction.
6. A deformable liquid state sensor according to claim 1, 4 or 5, characterized in that the liquid metal droplets (3) are single droplets grouped together, having a diameter of 5-10 mm, directly obtained by injection with a syringe.
7. A deformable liquid state sensor according to claim 1, characterized in that the volume ratio of the liquid metal droplet (3) and the electrolyte solution (4) is 4: 1.
8. The deformable liquid sensor of claim 1, wherein the electrolyte solution (4) is a sodium hydroxide solution.
9. A deformable liquid state sensor according to claim 1, characterized in that the circuit part (5) comprises or consists directly of a power source, a resistor, a current meter and leads.
10. A deformable liquid state sensor as claimed in claim 9, wherein the power source is a battery or signal generator providing an electrical signal to the integrated circuit; the ammeter is used for measuring current change caused by the influence of the external environment on the liquid metal liquid drops (3), the conducting wire is used for communicating elements in the circuit with the liquid metal liquid drops (3), the tail end of the conducting wire is of a peak structure and can pierce through the packaging layer (1) and be in contact with the liquid metal liquid drops (3), and meanwhile the conducting wire is sealed by the sealing plug (2) and is fixed in position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010037464.5A CN111198052A (en) | 2020-01-14 | 2020-01-14 | Deformable liquid sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010037464.5A CN111198052A (en) | 2020-01-14 | 2020-01-14 | Deformable liquid sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111198052A true CN111198052A (en) | 2020-05-26 |
Family
ID=70746355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010037464.5A Pending CN111198052A (en) | 2020-01-14 | 2020-01-14 | Deformable liquid sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111198052A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114659619A (en) * | 2022-03-22 | 2022-06-24 | 浙江大学 | Full-soft self-driven vibration sensor and preparation method thereof |
| CN114964599A (en) * | 2022-06-14 | 2022-08-30 | 南京高华科技股份有限公司 | Micromechanical pressure sensor and method for producing the same |
| CN115077752A (en) * | 2022-06-27 | 2022-09-20 | 西安科技大学 | Liquid metal flexible mechanics monitoring device with ventilation function |
| CN117213672A (en) * | 2023-11-09 | 2023-12-12 | 中国科学技术大学 | High-sensitivity flexible touch sensor based on liquid metal and preparation method thereof |
| CN115077752B (en) * | 2022-06-27 | 2024-06-04 | 西安科技大学 | Flexible mechanical monitoring device of liquid metal with ventilation function |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010071574A1 (en) * | 2008-12-16 | 2010-06-24 | Cheng Shi | Stretchable high-frequency electronics |
| CN103127608A (en) * | 2013-01-22 | 2013-06-05 | 清华大学 | Manufacturing method of inner body injecting and molding type electronic device |
| CN106370493A (en) * | 2016-09-30 | 2017-02-01 | 中国科学院理化技术研究所 | Liquid metal artificial cell and preparation method thereof |
| CN107687992A (en) * | 2017-08-03 | 2018-02-13 | 清华大学 | The regulator control system and method for liquid metal surface tension in the case of a kind of no outfield |
| CN107833656A (en) * | 2017-09-30 | 2018-03-23 | 华南理工大学 | A kind of stretchable flexibility function conductor |
| CN110186487A (en) * | 2019-06-03 | 2019-08-30 | 北京航空航天大学 | A kind of rheostat flexible sensing unit design and preparation method thereof |
-
2020
- 2020-01-14 CN CN202010037464.5A patent/CN111198052A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010071574A1 (en) * | 2008-12-16 | 2010-06-24 | Cheng Shi | Stretchable high-frequency electronics |
| CN103127608A (en) * | 2013-01-22 | 2013-06-05 | 清华大学 | Manufacturing method of inner body injecting and molding type electronic device |
| CN106370493A (en) * | 2016-09-30 | 2017-02-01 | 中国科学院理化技术研究所 | Liquid metal artificial cell and preparation method thereof |
| CN107687992A (en) * | 2017-08-03 | 2018-02-13 | 清华大学 | The regulator control system and method for liquid metal surface tension in the case of a kind of no outfield |
| CN107833656A (en) * | 2017-09-30 | 2018-03-23 | 华南理工大学 | A kind of stretchable flexibility function conductor |
| CN110186487A (en) * | 2019-06-03 | 2019-08-30 | 北京航空航天大学 | A kind of rheostat flexible sensing unit design and preparation method thereof |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114659619A (en) * | 2022-03-22 | 2022-06-24 | 浙江大学 | Full-soft self-driven vibration sensor and preparation method thereof |
| US20230304852A1 (en) * | 2022-03-22 | 2023-09-28 | Zhejiang University | Fully soft self-powered vibration sensor and its fabrication method |
| US11874158B2 (en) * | 2022-03-22 | 2024-01-16 | Zhejiang University | Fully soft self-powered vibration sensor and its fabrication method |
| CN114964599A (en) * | 2022-06-14 | 2022-08-30 | 南京高华科技股份有限公司 | Micromechanical pressure sensor and method for producing the same |
| CN115077752A (en) * | 2022-06-27 | 2022-09-20 | 西安科技大学 | Liquid metal flexible mechanics monitoring device with ventilation function |
| CN115077752B (en) * | 2022-06-27 | 2024-06-04 | 西安科技大学 | Flexible mechanical monitoring device of liquid metal with ventilation function |
| CN117213672A (en) * | 2023-11-09 | 2023-12-12 | 中国科学技术大学 | High-sensitivity flexible touch sensor based on liquid metal and preparation method thereof |
| CN117213672B (en) * | 2023-11-09 | 2024-05-14 | 中国科学技术大学 | High-sensitivity flexible touch sensor based on liquid metal and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111198052A (en) | Deformable liquid sensor | |
| CN101839703B (en) | Strain sensor | |
| CN102207415B (en) | Conductive-rubber-based flexible array clip pressure sensor and manufacturing method | |
| CN108151949A (en) | A kind of flexible electronic pressure sensor device and preparation method thereof | |
| CN110146198A (en) | A kind of flexibility self energizing pressure sensor | |
| CN106525296A (en) | Electronic skin for touch detection | |
| CN108180927B (en) | Full-flexible self-powered sensor and manufacturing method thereof | |
| CN205785644U (en) | MEMS minute-pressure pressure transducer | |
| CN206291983U (en) | A kind of electronic skin for touch detection | |
| CN110398259A (en) | The flexible sensing device and preparation method of more perceptional functions | |
| CN110082012B (en) | Flexible pressure sensor and manufacturing method thereof | |
| CN111504527B (en) | Sea urchin-shaped oxide-based composite membrane bionic pressure sensor and preparation method thereof | |
| CN105136873B (en) | A kind of integrated sensor and preparation method thereof | |
| CN113340481B (en) | Pressure sensor and preparation method thereof | |
| CN110255491A (en) | MEMS pressure sensor encapsulating structure and packaging method | |
| WO2019119286A1 (en) | Flexible electronic pressure sensing device and preparation method therefor | |
| CN111998977A (en) | High-sensitivity flexible wearable sensor array and preparation method thereof | |
| CN107340082A (en) | A kind of flexible film pressure sensor | |
| CN111089839A (en) | Flexible wireless integrated skin vision sensing system for analyzing body surface liquid | |
| CN108344530A (en) | Strength sensor | |
| CN111024213B (en) | Flexible capacitive vibration sensor and manufacturing method thereof | |
| CN103759866B (en) | Coplanar small electrode type soft pressure sensitive probe and method of production thereof | |
| CN113203355A (en) | Flexible strain sensor and manufacturing method thereof | |
| CN209263895U (en) | A kind of electronic rheostat sensor for pile detection | |
| CN209541954U (en) | A kind of multifunction electronic skin |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200526 |