CN214529903U - Liquid metal pressure sensing fiber array - Google Patents
Liquid metal pressure sensing fiber array Download PDFInfo
- Publication number
- CN214529903U CN214529903U CN202022435894.0U CN202022435894U CN214529903U CN 214529903 U CN214529903 U CN 214529903U CN 202022435894 U CN202022435894 U CN 202022435894U CN 214529903 U CN214529903 U CN 214529903U
- Authority
- CN
- China
- Prior art keywords
- liquid metal
- fiber
- pressure sensing
- layer
- flexible
- 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.)
- Active
Links
Images
Landscapes
- Measuring Fluid Pressure (AREA)
Abstract
The utility model relates to a liquid metal pressure sensing fiber array, this liquid metal pressure sensing fiber array, include: a) a flexible fiber; b) a liquid metal coating covering the flexible fibers; and c) an encapsulation layer on the surface of the liquid metal cladding layer. The utility model provides a liquid metal pressure sensing fiber array to the resistance change that liquid metal produced when deformation, through the external force that the signal of telecommunication can direct feedback fibre received and produced deformation, realization stress-the measuring of meeting an emergency that can be fine, but wide application in fields such as flexibility, sensing.
Description
Technical Field
The utility model relates to a sensing technology field, concretely relates to liquid metal pressure sensing fiber array.
Background
Pressure sensing technology has important applications in many fields, and has increasingly wide applications in the fields of information, robots and the like, and at present, the sensing technology mainly changes electrical properties of sensing materials through deformation of metal, semiconductor or high polymer materials with piezoelectric functions. However, the cost is high, the precision is limited, the liquid metal has the characteristics of metal and fluid, and has important application prospects in the field of pressure sensing, but the liquid metal has large surface tension, is difficult to form a fixed form or has good adhesion with other materials, and no relevant report that the liquid metal can be effectively used for pressure sensing exists. There is a need to provide a new sensing material with a flexible structure that allows fast and accurate detection of stress-strain.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a liquid metal pressure sensing fiber array, this liquid metal pressure sensing fiber array to the resistance change that liquid metal produced when deformation, through the external force that the signal of telecommunication can direct feedback fibre received and produced deformation, realization stress-the measuring of meeting an emergency that can be fine, but wide application in fields such as flexibility, sensing.
The embodiment of the utility model provides a liquid metal pressure sensing fiber array, include:
a) a flexible fiber;
b) a liquid metal coating covering the flexible fibers;
c) an encapsulation layer on a surface of the liquid metal cladding layer.
The embodiment of the utility model provides a liquid metal pressure sensing fiber array, the different length's of accessible fibre (liquid metal pressure sensing fibre), the power that can test different scopes forms the array, increases test range.
The utility model discloses in, through covering liquid metal on the flexible fiber surface, change its resistance through fibrous deformation. According to the relation between the fiber stress-strain-resistance, a series of corresponding numerical values are obtained, and the strain (deformation) and the stress of the fiber can be deduced through the resistance change.
In some preferred embodiments, the flexible fibers have a diameter of 75 to 500 μm.
In some preferred embodiments, the liquid metal coating layer has a layer thickness of 2 to 50 μm.
In some preferred embodiments, the thickness of the packaging layer is 10-30 μm.
In some preferred embodiments, the flexible fiber is a composite of PBT and PET, or the flexible fiber includes: a fibrous inner core, and a flexible fibrous layer covering the fibrous inner core; the liquid metal coating covers the flexible fiber layer of the flexible fibers.
In some preferred embodiments, the fiber inner core is a carbon fiber filament or a copper fiber filament.
In some preferred embodiments, the diameter of the fiber inner core is 20-50 μm. The utility model discloses in, adopt the carbon fiber as commercial carbon fiber, can further solve electrically conductive problem with liquid metal level common use, have better electric conductivity. The adoption of the fiber inner core with the rough surface can improve the bonding force of the carbon fiber and the PET wood material.
In some preferred embodiments, the flexible fiber layer is a composite of PBT (poly (tetramethylene terephthalate)) and PET (polyethylene terephthalate).
In some preferred embodiments, the layer thickness of the flexible fiber layer is 20-50 μm. Researches show that by further adopting the layers and the layer thickness thereof, the material has the function of improving flexibility and has better mechanical property.
In some preferred embodiments, the mass ratio of the PBT to the PET is 99: 1-1: 99, and the mass ratio of the PBT to the PET is preferably 20: 80-60: 40.
In some preferred embodiments, the liquid metal is a gallium indium liquid metal, a gallium indium tin liquid metal, or a bismuth indium tin liquid metal.
In some preferred embodiments, the encapsulation layer is a silicone rubber prepolymer.
The beneficial effects of the utility model reside in at least: the utility model provides a liquid metal pressure sensing fiber array, through attaching to liquid metal on flexible fiber surface, form the conducting layer, through crooked fibre, change conducting layer resistance, realize the one-to-one relation of stress-meeting an emergency-resistance. And the method can effectively improve the accurate measurement of the resistance change of the liquid metal, quickly reflect the influence of the outside on the fiber form, and detect the minimum force of 10-6And N, the minimum resistance is changed to 1 mu omega, so that the stress-strain rapid detection is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed to be used in the description of the embodiments or the prior art 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 for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of a structure of a liquid metal-coated flexible fiber according to embodiment 2 of the present invention;
fig. 2 is a partial schematic view of a structure of flexible fibers wrapped by liquid metal in embodiment 3 of the present invention;
in the figure, 1 is a fiber inner core, 2 is a flexible fiber layer, 3 is a liquid metal coating layer, and 4 is a packaging layer.
Detailed Description
In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solution in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention, but do not limit the scope of the present invention. The examples do not show the specific techniques or conditions, according to the technical or conditions described in the literature in the field, or according to the product specifications.
The utility model discloses in, the manufacturer businessman is not noted to used instruments etc. and the conventional product that obtains is bought to accessible regular channel merchant. The process is conventional unless otherwise specified, and the starting materials are commercially available from the open literature. The examples do not show the specific techniques or conditions, according to the technical or conditions described in the literature in the field, or according to the product specifications.
Some embodiments of the utility model provide a liquid metal pressure sensing fiber array, include:
a) a flexible fiber;
b) a liquid metal coating covering the flexible fibers; and
c) an encapsulation layer on a surface of the liquid metal cladding layer;
the flexible fibers are a compound of PBT and PET in a mass ratio of 99: 1-1: 99, and the diameter of the flexible fibers is 75-500 mu m; the thickness of the liquid metal coating layer is 20-50 mu m; the thickness of the packaging layer is 20-50 mu m; the liquid metal is gallium indium liquid metal, gallium indium tin liquid metal or bismuth indium tin liquid metal; the packaging layer is made of silicon rubber prepolymer. In the scheme, after the surface of the PET/PBT fiber is coated with the liquid metal, the two ends of the PET/PBT fiber are connected with a direct-current power supply, and the bent fiber has obvious influence on the resistance change of the fiber.
Some embodiments of the utility model provide a liquid metal pressure sensing fiber array, include:
a) a flexible fiber; the flexible fiber includes:
a fibrous core, and
a flexible fibrous layer covering the fibrous inner core;
b) a liquid metal coating covering the flexible fibers; and
c) an encapsulation layer on a surface of the liquid metal cladding layer;
the fiber inner core is made of carbon fiber yarns, the flexible fiber layer is made of a compound of PBT and PET in a mass ratio of 99: 1-1: 99, and the diameter of the flexible fibers is 75-500 mu m; the thickness of the liquid metal coating layer is 20-50 mu m; the thickness of the packaging layer is 10-30 mu m; the diameter of the fiber inner core is 20-50 μm; the thickness of the flexible fiber layer is 20-200 mu m; the liquid metal is gallium indium liquid metal, gallium indium tin liquid metal or bismuth indium tin liquid metal; the packaging layer is made of silicon rubber prepolymer. In the scheme, after the surface of the fiber is covered with the liquid metal, the liquid metal and the carbon fiber inside the fiber form a loop, and after the two ends of the fiber are connected with direct current, the bending deformation can have sensitive reaction on the resistance.
Some embodiments of the present invention provide a method for preparing a liquid metal pressure sensing fiber array, which specifically comprises the following steps:
1) mixing PBT and PET, heating at 90-190 ℃, performing extrusion molding, and cooling with water at 10-20 ℃ to obtain flexible fibers;
2) coating a liquid metal layer on the surface of the flexible fiber by dipping or coating the liquid metal; and dipping a silicon rubber prepolymer, heating at 70 ℃ for 1-2 h, and covering a packaging layer on the surface of the liquid metal layer.
Some embodiments of the present invention provide a method for preparing a liquid metal pressure sensing fiber array, which specifically comprises the following steps:
1) mixing PBT and PET, heating at 90-190 ℃, adding carbon fiber yarns when the mixture of PBT and PET is heated to the glass transition temperature, performing extrusion molding by using a porous mold to prepare flexible fibers containing the carbon fiber yarns in the middle, and cooling by using water at 10-20 ℃ to obtain the flexible fibers;
2) coating a liquid metal layer on the surface of the flexible fiber by dipping or coating the liquid metal; and dipping a silicon rubber prepolymer, heating at 70 ℃ for 1-2 h, and covering a packaging layer on the surface of the liquid metal layer.
Example 1
The present embodiment provides a liquid metal pressure sensing fiber:
a) a flexible fiber;
b) a liquid metal coating covering the flexible fibers;
c) an encapsulation layer on a surface of the liquid metal cladding layer;
the diameter of the flexible fiber is 80 μm; the liquid metal is GaIn10(ii) a The packaging layer is a silicon rubber prepolymer; the flexible fiber is a compound of PBT and PET with the mass ratio of 50: 50; the thickness of the liquid metal coating layer is 30 mu m; the thickness of the packaging layer is 50 μm;
the embodiment also provides a preparation method of the liquid metal pressure sensing fiber, which comprises the following steps:
(1) mixing PBT and PET in proportion, heating at 125 ℃, pressing the mixture into a hole die through an extruding machine when the mixture becomes a creep state after reaching a glass transition temperature, rapidly stretching into filaments, and performing low-temperature water treatment at 15 ℃ to obtain fibers;
(2) and coating the liquid metal on the surface by a coating mode to form a liquid metal layer. Dipping a silicon rubber prepolymer, heating to 70 ℃ for 2 hours, and carrying out surface insulation packaging;
the liquid metal fiber prepared in example 1 was tested for good conductivity and the resistance decreased with increasing number of applications and no longer changed significantly with 7-8 applications. When the fiber is bent, it causes a change in the resistance of the fiber, which increases during bending of the fiber. According to the stress-strain data of the fiber, the stress and strain generated by the fiber can be obtained through resistance change, so that the sensing function is realized. During the test, the DC power supply 1V and 1A is used.
Example 2
The present embodiment provides a liquid metal pressure sensing fiber and a preparation method thereof, which are the same as those in embodiment 1, except that:
the flexible fiber includes: a fiber core 1 (carbon fiber filament), and a flexible fiber layer 2 (same as the flexible fiber in example 1) covering the fiber core 1; the diameter of the fiber inner core is 20 μm; the layer thickness of the flexible fiber layer was 100 μm. As shown in fig. 1, a liquid metal coating layer 3 wraps flexible fibers (a fiber core 1 is mixed with a flexible fiber layer 2), and an encapsulation layer 4 is arranged on the surface of the liquid metal coating layer 3. In the preparation process, when the mixture of PBT and PET reaches the glass transition temperature, carbon fiber filaments are added into a hole die, flexible fibers containing the carbon fiber filaments in the middle are obtained through extrusion molding, and then the liquid metal layer and the packaging layer are prepared through the outer surface.
By testing for example 2: the method specifically comprises the following steps: the positive electrode (or negative electrode) of the external power supply is connected with the central carbon fiber; the other end is linked with external liquid metal to form a closed circuit. Other steps are as in example 1, and the stress and strain produced by the fiber can be directly judged by the change in resistance.
Example 3
The same method as in example 2 was used except that the fiber core was changed to a copper wire as shown in fig. 2.
Example 4
The embodiment provides a liquid metal pressure sensing fiber and a preparation method thereof. The only difference from example 1 is that: the surface of the flexible fiber is rough. In order to increase the wettability of the liquid metal and the fibers, a hole die with certain roughness (the roughness in the hole is 10-50 nm) is selected in the process of preparing the flexible fibers, and the prepared fibers with various edges and corners can effectively improve the wettability of the liquid metal and the fibers by increasing the roughness of the fibers, so that the adhesion between the liquid metal and the fibers is increased, and the accuracy of a sensing result is improved.
Example 5
The same fibers and method as in example 2 were used except that fibers of different lengths were prepared, formed into an array, and the test range was increased.
Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (9)
1. An array of liquid metal pressure sensing fibers, comprising:
a) a flexible fiber;
b) a liquid metal coating covering the flexible fibers; and
c) an encapsulation layer on a surface of the liquid metal cladding layer.
2. The liquid metal pressure sensing fiber array of claim 1, wherein the flexible fibers have a diameter of 75-500 μm.
3. The liquid metal pressure sensing fiber array of claim 2, wherein the liquid metal cladding layer has a layer thickness of 2-50 μm; and/or the thickness of the packaging layer is 10-30 mu m.
4. A liquid metal pressure sensing fiber array according to claim 3, wherein said flexible fibers comprise:
a fibrous core, and
a flexible fibrous layer covering the fibrous inner core; the liquid metal coating covers the flexible fiber layer of the flexible fibers.
5. The liquid metal pressure sensing fiber array of claim 4, wherein the fiber inner core is a carbon fiber filament or a copper fiber filament.
6. A liquid metal pressure sensing fiber array according to claim 5, wherein the diameter of the fiber core is 20-50 μm.
7. The liquid metal pressure sensing fiber array of claim 4, wherein the flexible fiber layer has a layer thickness of 20-50 μm.
8. A liquid metal pressure sensing fiber array according to claim 1, wherein the liquid metal is a gallium indium liquid metal, a gallium indium tin liquid metal, or a bismuth indium tin liquid metal.
9. A liquid metal pressure sensing fiber array according to any of claims 1-8, wherein the encapsulation layer is a silicone rubber prepolymer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022435894.0U CN214529903U (en) | 2020-10-28 | 2020-10-28 | Liquid metal pressure sensing fiber array |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022435894.0U CN214529903U (en) | 2020-10-28 | 2020-10-28 | Liquid metal pressure sensing fiber array |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214529903U true CN214529903U (en) | 2021-10-29 |
Family
ID=78229805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022435894.0U Active CN214529903U (en) | 2020-10-28 | 2020-10-28 | Liquid metal pressure sensing fiber array |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214529903U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114486011A (en) * | 2022-01-29 | 2022-05-13 | 重庆文理学院 | Preparation method of liquid metal touch pressure sensor |
-
2020
- 2020-10-28 CN CN202022435894.0U patent/CN214529903U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114486011A (en) * | 2022-01-29 | 2022-05-13 | 重庆文理学院 | Preparation method of liquid metal touch pressure sensor |
| CN114486011B (en) * | 2022-01-29 | 2023-07-25 | 重庆文理学院 | Preparation method of liquid metal touch pressure sensor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Wang et al. | Downsized sheath–core conducting fibers for weavable superelastic wires, biosensors, supercapacitors, and strain sensors | |
| JP4547852B2 (en) | Manufacturing method of electrical parts | |
| CN114411413A (en) | Liquid metal pressure sensing fiber array and preparation method thereof | |
| CN109929248B (en) | Preparation method of carbon nano tube fiber/polydimethylsiloxane composite conductive elastomer | |
| CN113203771B (en) | Humidity sensing fiber and preparation method and application thereof | |
| WO2015043236A1 (en) | Friction pressure sensing cable and manufacturing method therefor | |
| CN214529903U (en) | Liquid metal pressure sensing fiber array | |
| CN110895173B (en) | Preparation method of flexible stress sensor based on composite multilayer conductive material | |
| CN107473208B (en) | Preparation method of self-repairing sensor based on forest-shaped graphene interwoven network | |
| Xue et al. | Wearable and visual pressure sensors based on Zn 2 GeO 4@ polypyrrole nanowire aerogels | |
| CN112432589B (en) | Parallel flexible strain sensor and preparation method thereof | |
| CN111556911A (en) | Method and apparatus for preparing copolymer-wrapped nanotube fibers | |
| Gao et al. | Flexible and sensitive piezoresistive electronic skin based on TOCN/PPy hydrogel films | |
| CN110306354A (en) | A kind of preparation method of the stretchable strain transducer of high heat conductance | |
| Zhou et al. | Liquid Metal‐Based Self‐Healable and Elastic Conductive Fiber in Complex Operating Conditions | |
| CN112146796A (en) | Flexible stress sensor and preparation method thereof | |
| CN113029402A (en) | Wearable flexible sensor and preparation method thereof | |
| Liu et al. | A highly stretchable and ultra-sensitive strain sensing fiber based on a porous core–network sheath configuration for wearable human motion detection | |
| CN112796101A (en) | Composite fiber and preparation method thereof, and graphene flexible temperature sensing array and preparation method thereof | |
| KR102481070B1 (en) | heating cable | |
| CN113029400B (en) | Liquid crystal polymer stretching and pressure integrated sensor and preparation method thereof | |
| CN213957215U (en) | High-molecular resistance type humidity sensitive element | |
| Zhang et al. | A Bandi flexible pressure sensor based on the composite of laser-induced graphene and AgNWs | |
| KR102476834B1 (en) | Metal-coated carbon fiber for heating cable, manufacturing method thereof, and heating cable manufactured using the same | |
| CN115522279B (en) | High-performance ion-electron composite thermoelectric fiber and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |